Advanced Architectural & Building Engineering interview questions

125 questions with answers (ARC-301 to ARC-425). Try each one aloud before reading the answer.

Architectural Design Principles

ARC-301 · How would you plan a 200-bed hospital so that clinical flows don't cross?

Separate flows for outpatients, inpatients, emergency, staff, visitors, clean supplies and waste, with dedicated lifts and corridors. Cluster departments by adjacency (emergency next to imaging and OT, ICU near OT), and keep infection-control zones and future expansion zones clear.

ARC-302 · How do you balance daylight and heat gain in a deep-plan office in a hot climate?

Limit plan depth to roughly 2–2.5 times ceiling height from each façade, use north light where possible, add light shelves and atria to push daylight deeper, and use external shading with high-VLT, low-SHGC glazing so daylight enters without excessive solar heat.

ARC-303 · How would you design a school building for a composite climate on a tight budget?

Orient long façades north-south, use single-loaded corridors for cross-ventilation, deep verandahs and shaded openings, high ceilings with ceiling fans, thermal mass walls, and a cool roof. These passive measures cut cooling needs with low capital cost.

ARC-304 · How do you check if a floor plan meets universal accessibility requirements?

Verify step-free entry and ramps (1:12 maximum), lift sizes, door clear widths (at least 900 mm), turning circles of 1500 mm, accessible toilets, tactile paving, signage contrast and reachable controls, against the Harmonised Guidelines and NBC.

ARC-305 · How would you improve an inefficient office floor plate?

Rationalise the core position (central or offset), reduce corridor area, align structural grids with furniture modules, and remove dead-end spaces. Target net-to-gross efficiency of around 80–85% for speculative offices.

ARC-306 · How do you design a residential layout for privacy in a dense urban site?

Offset windows from neighbours, use courtyards and screened balconies, zone public spaces toward the street and private rooms inward, and use level changes and landscaping as buffers.

ARC-307 · How do you incorporate future flexibility in a commercial building?

Use larger structural spans, raised floors or flexible service zones, demountable partitions, generous floor-to-floor heights and spare riser capacity, so layouts can change without major works.

ARC-308 · How would you plan a mixed-use building with retail, offices and residences?

Separate entries, lifts and parking for each use, place noisy and public uses at the base, use transfer structures carefully at the use change, and coordinate fire compartmentation and services zoning for each occupancy.

ARC-309 · How do you design a campus master plan for walkability?

Keep key buildings within a 5–10 minute walk, create shaded pedestrian spines, separate vehicles at the edges, provide mixed uses at nodes and design legible paths and landmarks.

ARC-310 · How do you resolve conflicts between aesthetics and building codes in a facade design?

Engage code consultants early, test fire, structural and energy requirements on design options, and find solutions (such as fire-rated materials or shading that meets both energy and visual intent) rather than compromising compliance.

ARC-311 · How would you evaluate a design proposal with a client using post-occupancy data?

Compare design intentions with measured energy use, comfort surveys, space utilisation and maintenance issues, identify gaps, and use the lessons to refine the brief and future designs.

Building Materials

ARC-312 · How do you calculate the U-value of a cavity wall with insulation?

Sum thermal resistances: internal surface (≈0.13), plaster, inner leaf, insulation (thickness/k), cavity (≈0.18), outer leaf and external surface (≈0.04), then U = 1/ΣR. For example 50 mm insulation with k = 0.035 adds about 1.43 m²K/W, cutting U sharply.

ARC-313 · How do you select glazing for a west-facing façade in a hot climate?

Choose low SHGC (about 0.25 or lower), adequate VLT for daylight, low U-value, and combine with external shading. Check glare and colour neutrality, and consider fritted or electrochromic glass for very exposed façades.

ARC-314 · How would you specify concrete for a coastal building?

Use a higher grade (M30–M40) with low water-cement ratio, blended cements (PPC or slag) for chloride resistance, adequate cover (around 50 mm or more for severe exposure), corrosion-inhibiting admixtures where needed, and good curing.

ARC-315 · How do you choose an external cladding material for a high-rise?

Evaluate fire performance (non-combustible core required for ACP above certain heights), wind load resistance, weathering, maintenance, cost and aesthetics. Post-Grenfell, combustible cladding is restricted on tall buildings.

ARC-316 · How do you reduce embodied carbon in a building's materials?

Use blended cements (fly ash, GGBS), optimise structural sizes, specify recycled steel, use timber or engineered wood where suitable, choose local materials and avoid over-specification.

ARC-317 · How would you prevent moisture problems in a gypsum-board partition in a bathroom?

Use moisture-resistant or cement boards, apply a waterproofing membrane behind tiles, seal joints and penetrations, and provide ventilation. Standard gypsum board absorbs water and degrades.

ARC-318 · How do you assess the durability of a building material?

Review exposure conditions, material standards and test data (freeze-thaw, chloride penetration, UV resistance), maintenance requirements and life-cycle cost.

ARC-319 · How would you select flooring for a hospital?

Choose seamless, hygienic, slip-resistant, chemical-resistant flooring such as sheet vinyl with coved skirting, easy to clean and maintain, with suitable acoustic properties.

ARC-320 · How do you compare AAC blocks with burnt clay bricks for a project?

AAC is lighter (reducing structural load), has better insulation and faster construction, but needs specific mortars and careful handling; bricks are robust and familiar. Compare cost, thermal performance, embodied energy and availability.

ARC-321 · How do you specify sealants for a curtain wall?

Use structural silicone for glazing bonds, weather sealants with movement capacity matching joint movement, compatibility testing with substrates and adequate joint geometry.

ARC-322 · How do you check fire performance of building materials?

Review test classifications for combustibility, surface spread of flame, smoke development and fire resistance in assemblies.

Building Construction Techniques

ARC-323 · How would you plan the construction sequence for a 20-storey RC building?

Site preparation, excavation and shoring, foundation and basement, superstructure cycles with formwork systems, services first fix, façade, finishes and commissioning. Plan floor cycles, crane locations and material logistics.

ARC-324 · How do you prevent water leakage in a basement?

Use a combination of waterproof concrete, membranes, waterbars at joints, drainage behind walls and sump pumps. Detail joints and penetrations carefully.

ARC-325 · How would you choose between precast and cast-in-situ construction?

Precast gives speed, quality and less site labour but needs repetition, cranes and transport; cast-in-situ gives flexibility for complex forms. Compare cost, schedule and site constraints.

ARC-326 · Cracks have appeared in new plaster on an RC-framed building. How do you diagnose them?

Map crack patterns: cracks at frame-masonry junctions point to differential movement (fix with mesh at junctions), map-pattern cracks to shrinkage from rich mix or poor curing, and diagonal cracks near openings or corners to settlement or structural movement. Monitor width over time before repair.

ARC-327 · How do you control quality in concrete work on site?

Check materials (cement, aggregates, water), mix design and batching, slump and cube tests, formwork alignment, cover blocks, compaction by vibration and curing duration. Record test results and act on non-conformances.

ARC-328 · How would you plan a fast-track residential tower using aluminium formwork?

Design for repetition with standardised floor plates, finalise services openings early so they are cast in, plan a 7–10 day floor cycle with crane and concrete supply, and coordinate MEP sleeves and inserts with the formwork supplier.

ARC-329 · How do you choose a foundation for a building on expansive black cotton soil?

Avoid shallow strip footings that heave and shrink; use under-reamed piles or piles founded below the active zone, provide a gap or cohesive non-swelling layer under grade beams, and control drainage around the building.

ARC-330 · How would you waterproof a terrace with a garden?

Use a root-resistant membrane over a sloped screed, a protection board, drainage layer and filter fabric, then growing medium. Detail upstands, outlets and penetrations, and flood-test before adding soil.

ARC-331 · How do you manage construction safety for high-rise façade work?

Provide edge protection, safety nets, certified gondolas or mast climbers, anchorage points and harness use, plan exclusion zones below, and run permit-to-work and daily toolbox talks.

ARC-332 · How would you retrofit an old load-bearing masonry building for seismic safety?

Add horizontal RC bands or steel ties at lintel and roof levels, strengthen corners and openings, add jacketing or ferrocement to weak walls, connect roof to walls, and improve diaphragm action after a structural assessment.

ARC-333 · How do you control dimensional accuracy in a precast building?

Set tolerances in design, use precise moulds and quality control at the factory, survey connections on site, and design joints and connections to absorb small deviations.

Structural Systems for Buildings

ARC-334 · How would you choose a structural system for a 40-storey office tower?

Compare a core-and-outrigger system, framed tube or tube-in-tube based on height, slenderness, wind and seismic loads and floor plan needs. Outriggers linking the core to perimeter columns greatly reduce lateral drift.

ARC-335 · How do you choose between a flat slab and beam-slab system?

Flat slabs give lower floor-to-floor height, faster formwork and flexible service routing, but need drops or shear heads for punching shear and have larger deflections; beam-slab systems suit longer spans and heavy loads.

ARC-336 · How do you control floor vibration in a long-span office floor?

Check natural frequency (aim above about 4–5 Hz for walking excitation), increase stiffness or mass, add damping or use composite action, and avoid resonance with walking frequencies.

ARC-337 · How would you design a building for a site in seismic zone V?

Use regular plan and elevation, ductile detailing to IS 13920, strong column–weak beam, adequate shear walls, avoid soft storeys and short columns, and consider base isolation for important buildings.

ARC-338 · How does a transfer floor affect seismic performance?

It creates a stiffness and mass discontinuity, concentrating forces and potentially creating a soft or weak storey. Codes often penalise or restrict such systems; careful detailing and analysis are needed.

ARC-339 · How would you check a long cantilever balcony design?

Check bending and shear at the support, deflection and vibration, back-span anchorage and counterweight, waterproofing and thermal bridge at the junction (use thermal breaks).

ARC-340 · How do you control lateral drift in a tall building?

Increase lateral stiffness with shear walls, cores, outriggers, belt trusses or perimeter tubes, and check inter-storey drift against code limits (e.g. 0.004 of storey height).

ARC-341 · How do you choose between steel and concrete for a large-span auditorium roof?

Steel trusses or space frames give lighter, longer spans and faster erection; concrete shells or post-tensioned beams give mass for acoustics and fire resistance. Compare span, loads, acoustics, cost and construction speed.

ARC-342 · How do you handle movement joints in a long building?

Provide expansion joints at about 45 m intervals (per IS guidelines) or where plan shape changes, separate structure fully, and detail finishes and services across joints.

ARC-343 · How would you assess structural capacity before adding floors to an existing building?

Review original drawings, test concrete strength (core tests) and reinforcement, check foundation capacity and soil, analyse the structure for new loads and seismic code requirements, and strengthen as needed.

ARC-344 · How do you design for wind on a slender tall building?

Use wind tunnel testing for dynamic effects, design for along-wind and across-wind vortex shedding, shape the plan to reduce forces (tapering, setbacks, corner softening), and add dampers if needed.

Plumbing & Electrical Services

ARC-345 · How would you size the overhead and underground tanks for a residential building?

Calculate daily water demand (persons × per capita demand, e.g. 135 L/day), plus fire reserve as per NBC. Typically store about a day's demand split between underground sump and overhead tank, plus a separate fire reserve.

ARC-346 · How do you design a plumbing system for a 30-storey building?

Divide into pressure zones (about every 10–12 floors) using intermediate tanks or pressure-reducing valves, use booster pumps or hydropneumatic systems, and size pipes with fixture units.

ARC-347 · How do you size a drainage stack?

Calculate fixture units for connected appliances, select stack size from code tables, ensure venting, and check maximum loading per branch and stack.

ARC-348 · How would you design a rainwater harvesting system for a campus?

Calculate roof catchment area × rainfall × runoff coefficient, design gutters and downpipes, filtration, storage tanks or recharge pits, and overflow arrangements.

ARC-349 · How do you calculate the maximum demand of a building's electrical load?

Sum connected loads by category, apply diversity and demand factors, and determine maximum demand; then size transformer and DG with margins.

ARC-350 · How do you select a transformer and DG set for a commercial building?

Transformer sized on maximum demand and power factor, DG sized for essential loads with start-up currents, and consider redundancy (N+1) for critical buildings.

ARC-351 · How would you plan service shafts in a high-rise residential building?

Stack wet areas (kitchens, toilets) vertically above each other so plumbing shafts run straight, give each shaft an access panel on every floor, size them for future pipes, keep electrical risers separate from water, and seal shafts at every floor with fire-stopping.

ARC-352 · How do you reduce water hammer in a high-rise plumbing system?

Limit flow velocities (about 1.5–2 m/s), use pressure-reducing valves at zone boundaries, fit arrestors near quick-closing valves and solenoids, and avoid sudden valve closures in pump controls.

ARC-353 · How do you design a sewage treatment plant for a residential complex?

Estimate flow from population and water demand (about 80% of supply), choose a process (MBBR, SBR or MBR) for space and outlet quality, size for peak factors, add tertiary treatment for reuse in flushing and landscaping, and plan sludge handling and odour control.

ARC-354 · How do you plan electrical distribution for a mall?

Use an HT supply with substations, main LT panels, rising mains or bus ducts to floor distribution boards, separate metering for tenants, DG backup for essential loads, and segregated circuits for lighting, power, HVAC and life-safety systems.

ARC-355 · How do you design an earthing system for a data centre?

Provide a low-impedance earth grid, a common bonding network, separate but bonded clean earth for IT equipment where specified, surge protection and regular testing of earth resistance (often below 1 Ω for critical facilities).

HVAC & Mechanical Services

ARC-356 · How do you estimate the cooling load for an office floor?

Add external loads (solar through glass, conduction through walls and roof), internal loads (people, lighting, equipment) and ventilation/infiltration loads (sensible and latent). Software (HAP, eQUEST) uses hourly weather data; rule-of-thumb checks are about 25–35 m²/TR for offices.

ARC-357 · How do you choose between a chilled-water plant and VRF for a 10,000 m² office?

Chilled water suits large central systems with high efficiency at scale, longer life and better control of fresh air; VRF suits smaller or phased buildings with individual zone control and lower plant space. Compare life-cycle cost, efficiency, maintenance and refrigerant charge.

ARC-358 · How do you design fresh-air ventilation for an open-plan office?

Use ASHRAE 62.1 or NBC rates (per person plus per area), deliver through a dedicated outdoor air system or AHUs with energy recovery, and use CO₂ sensors for demand-controlled ventilation.

ARC-359 · How would you reduce HVAC energy use in an existing building?

Upgrade chillers and pumps with VFDs, optimise setpoints and schedules, add economisers and heat recovery, improve building envelope and shading, commission controls and fix leaks.

ARC-360 · How do you size a cooling tower for a chiller plant?

Heat rejected = cooling load plus compressor work (about 1.25 × cooling load). Size for design wet-bulb temperature and approach, and calculate makeup water from evaporation, drift and blowdown.

ARC-361 · How do you size ducts using the equal friction method?

Choose a friction rate (e.g. 0.8–1 Pa/m), size each duct segment for its airflow to keep the same friction per length, then balance using dampers and check noise velocities.

ARC-362 · How do you design HVAC for an operating theatre?

Provide high air changes (about 20–25 ACH), HEPA filtration, positive pressure, laminar flow over the operating table, temperature and humidity control and redundancy.

ARC-363 · How do you plan smoke management with HVAC in a mall atrium?

Use smoke exhaust fans sized for fire scenarios, makeup air at low level, smoke reservoirs and curtains, and coordinate with fire alarm controls.

ARC-364 · How do you integrate thermal energy storage in a chiller plant?

Use chilled water or ice storage to shift cooling production to off-peak hours, reducing peak demand and plant size. Size storage for peak load periods.

ARC-365 · How do you control humidity in a hot-humid climate building?

Use dedicated outdoor air units with dehumidification, reheat or desiccant wheels, control infiltration and ensure condensation management.

Fire Safety

ARC-366 · How do you plan means of escape in a 25-storey office?

Provide at least two separate staircases, pressurised and fire-rated, within travel distance limits, with fire-check doors, refuge areas as required, and exits leading directly to open space. Exit widths are calculated from occupant load.

ARC-367 · How do you calculate the number of exits needed for an assembly hall?

Calculate occupant load (area/occupant load factor), divide by capacity per unit exit width, and provide at least two exits remote from each other.

ARC-368 · How do you plan fire compartmentation for a multi-storey hospital?

Patients can't all evacuate quickly, so each floor is split into at least two compartments separated by fire-rated walls and doors, allowing horizontal evacuation to the adjacent compartment (progressive evacuation). Shafts, ducts and service penetrations are fire-stopped and dampered to keep compartments intact.

ARC-369 · How do you specify a sprinkler system for a high-bay warehouse?

Classify the commodity hazard and storage height, then choose ceiling-only ESFR sprinklers or ceiling plus in-rack protection, set design density and operating area per NFPA 13 or IS 15105, and size the water storage and fire pump for the required duration (often 60–120 minutes).

ARC-370 · How would you upgrade fire safety in an old commercial building?

Carry out a fire risk assessment, then add automatic detection and alarm, sprinklers where feasible, fire doors and compartmentation, pressurised or protected stairs, emergency lighting and signage, and fix escape route widths and travel distances. Phase works to keep the building operating safely.

ARC-371 · How does a smoke control system work in a high-rise building?

Stairwells and lift lobbies are pressurised so smoke can't enter escape routes, corridors or floors may have smoke extraction, and fans, dampers and doors respond automatically to the fire alarm. Systems are commissioned with door-opening force and pressure difference tests.

ARC-372 · How do you select fire-rated glazing for a corridor wall?

Decide whether the wall needs integrity only (E) or integrity plus insulation (EI) for its required rating, then use glass, frames, gaskets and fixings tested together as a system. EI glazing limits radiant heat on the escape side, which matters next to escape routes.

ARC-373 · How do you plan fire tender access for a high-rise building?

Provide access roads of the required width (often 6 m or more), turning radius and load capacity for aerial ladders, hard standing within reach of the façade, hydrants and the fire service inlet, and keep these areas clear of planting, kiosks and parking.

ARC-374 · How do you protect structural steel from fire?

Apply intumescent coatings, which swell into an insulating char, fire boards, or sprayed cementitious protection, with thickness chosen from the section factor and required fire rating (e.g. 120 minutes). Concrete encasement or filling hollow sections are alternatives.

ARC-375 · How do you manage fire risk during construction?

Control hot work with permits and fire watches, store flammables in safe areas, keep temporary fire extinguishers and risers working as floors rise, maintain clear escape routes and lighting, and remove combustible waste regularly. Construction sites burn more easily than finished buildings.

Building Acoustics

ARC-376 · A 600 m³ classroom has an RT of 1.8 s. How much absorption must be added to reach 0.6 s?

By Sabine, A = 0.161V/T. At 1.8 s, A = 0.161 × 600/1.8 ≈ 53.7 m² sabins; at 0.6 s, A ≈ 161 m² sabins. About 107 m² sabins must be added, for example roughly 135 m² of panels with α ≈ 0.8.

ARC-377 · How would you design the acoustics of a multipurpose auditorium?

Shape the room to avoid echoes and focusing (no large concave surfaces), use reflectors to send early sound to the audience, choose RT for the main use (around 1.0–1.5 s for speech and music), use variable absorption (curtains, banners) for flexibility, and isolate the hall from noise and vibration.

ARC-378 · How do you improve sound insulation between hotel rooms?

Use heavy or double-leaf separating walls with insulated cavities, seal all gaps and penetrations, offset electrical boxes, treat flanking paths through floors, ceilings and façades, and use acoustically rated doors with seals. Target a high DnT,w (around 50 dB or more).

ARC-379 · How do you reduce footfall noise transmitted to the apartment below?

Use floating floors with resilient layers, soft floor finishes or acoustic underlays, and suspended ceilings below with isolated hangers. Impact sound is mainly a floor construction problem, not a wall one.

ARC-380 · How would you control HVAC noise in a recording studio?

Use low duct velocities, lined ducts and silencers, flexible connections and vibration isolators on equipment, place plant far away, and design to a very low NC level (around NC 15–20).

ARC-381 · How do you design an open-plan office for speech privacy?

Use high-absorption ceilings (NRC ≥ 0.85), screens of adequate height between desks, sound masking at a comfortable level, and separate quiet rooms for focused or confidential work. The ABC rule: Absorb, Block, Cover.

ARC-382 · How would you protect a building near a busy highway from traffic noise?

Orient sensitive rooms away from the road, use the building or barriers as screens, specify high-performance glazing (laminated, double glazing with different pane thicknesses), acoustic ventilators and sealed façades.

ARC-383 · How do you calculate the combined level of two noise sources at 80 dB and 85 dB?

L = 10 log(10^8.0 + 10^8.5) = 10 log(1.0 × 10⁸ + 3.16 × 10⁸) ≈ 86.2 dB. Adding a quieter source adds only about 1.2 dB to the louder one.

ARC-384 · How would you test the acoustic performance of a completed building?

Measure reverberation time with impulse or noise sources, airborne sound insulation between rooms (DnT,w), impact sound with a tapping machine, and background noise levels, then compare with design targets.

ARC-385 · How do you treat a room with flutter echo?

Add absorption or diffusion on one of the parallel reflective surfaces, or angle one wall slightly (a few degrees) so sound doesn't bounce back and forth.

Lighting & Daylighting

ARC-386 · How many luminaires are needed to light a 20 m × 10 m office to 500 lux?

Using the lumen method, N = E × A/(F × UF × MF). With 4000 lm luminaires, UF 0.6 and MF 0.8: N = 500 × 200/(4000 × 0.6 × 0.8) ≈ 52 luminaires, then arrange them in a regular grid within spacing-to-height limits.

ARC-387 · How would you design daylighting for a museum gallery?

Control direct sunlight and UV to protect artefacts, use diffused top light or north light, set low illuminance limits for sensitive objects (often 50 lux), add blackout control and supplement with tunable LED lighting.

ARC-388 · How do you reduce glare in a south-facing office?

Use external horizontal shading sized for the sun angles, light shelves, internal blinds for low sun, careful desk orientation (screens perpendicular to windows) and glazing with suitable VLT.

ARC-389 · How would you design lighting controls to cut energy use?

Combine occupancy or vacancy sensors, daylight-linked dimming near windows, time schedules, task-ambient lighting and scene controls, and commission the system to make sure sensors work as intended.

ARC-390 · How do you evaluate daylight with simulation tools?

Model the building in tools such as Radiance, DIVA or ClimateStudio, calculate daylight factor or climate-based metrics (sDA, ASE, UDI), check glare with DGP, and test different window and shading options.

ARC-391 · How do you light a high-ceiling warehouse efficiently?

Use high-bay LED luminaires with suitable beam angles, motion sensors in aisles, daylight from skylights or translucent panels with dimming, and target appropriate illuminance (about 150–300 lux).

ARC-392 · How do you design lighting for a hospital ward?

Provide comfortable ambient light, separate reading lights, night lighting that doesn't wake patients, examination lighting with good colour rendering, and circadian-friendly lighting where possible.

ARC-393 · How do you check whether a façade meets ECBC daylight requirements?

Run daylight simulations to show that the required fraction of floor area achieves useful daylight levels for the required hours, while keeping window-to-wall ratio and SHGC within limits.

ARC-394 · How do you design façade lighting without causing light pollution?

Aim light downward or graze surfaces closely, use shielded fixtures and controlled beam angles, avoid over-lighting, and use timers to switch off late at night.

ARC-395 · How would you plan emergency lighting for an office building?

Provide illumination along escape routes and at exits, stairs and changes of direction (typically at least 1 lux on the floor), exit signs, and battery or central backup for the required duration (often 90 minutes), tested regularly.

Climate-Responsive & Green Buildings

ARC-396 · How would you take an office building to net-zero energy in India?

First cut demand: orientation, shading, insulated roof, high-performance glazing, daylighting, efficient HVAC (radiant cooling or high-COP chillers), LED lighting and plug-load control, aiming for an EPI well below 100 kWh/m²·yr. Then cover the remainder with rooftop and off-site solar, verified by metered data over a year.

ARC-397 · How do you use energy simulation to compare design options?

Build a baseline model per ECBC or ASHRAE 90.1, then test options (glazing, shading, insulation, HVAC efficiency, controls) one by one and in packages, comparing annual energy, peak loads and life-cycle cost. Calibrate assumptions on schedules and loads, because they drive results.

ARC-398 · How would you design a residence for the warm-humid climate of Chennai?

Maximise cross-ventilation with elongated plans and openings on opposite walls, use deep overhangs and verandahs, light-coloured reflective roofs with insulation, raised plinths, and lightweight materials with low thermal mass so the building cools quickly at night.

ARC-399 · How would you design for the hot-dry climate of Jaisalmer?

Use compact forms with courtyards, thick high-mass walls, small shaded openings, light colours, jaalis, and evaporative cooling or wind towers. Night ventilation flushes stored heat from the mass.

ARC-400 · How would you design a building to stay comfortable as the climate warms over its 50-year life?

Test the design with future weather files (e.g. 2050 and 2080 projections), not just historical data. Favour passive measures that keep working (shading, insulation, ventilation paths, cool roofs), leave space and capacity to upgrade cooling later, and design for heat waves, flooding and power outages.

ARC-401 · How would you plan water-efficient landscaping for a campus?

Use native, drought-tolerant plants, reduce lawn area, use drip irrigation with weather-based controls, reuse treated greywater, and design swales and recharge pits to retain rainwater.

ARC-402 · How do you achieve a high GRIHA or LEED rating cost-effectively?

Set targets early, focus on credits with low cost and high impact (site planning, daylighting, water efficiency, efficient fixtures), integrate design across disciplines, and document carefully. Expensive add-on technologies late in design give poor value.

ARC-403 · How do you size shading devices for a south-facing window in north India?

Use sun path diagrams or shading masks: a horizontal overhang with depth based on the summer noon sun altitude (high, around 80°+) blocks summer sun while letting low winter sun in. Projection ≈ window height/tan(altitude).

ARC-404 · How would you design a cool roof strategy for a factory?

Use high-reflectance (high SRI) coatings or membranes, add insulation under metal roofs, use turbo or ridge ventilators, and consider solar panels that also shade the roof.

ARC-405 · How do you evaluate the performance of a completed green building?

Measure energy and water use, indoor environmental quality (temperature, CO₂, daylight, noise), occupant satisfaction and maintenance, and compare with design predictions and benchmarks.

Building Codes, Bye-laws & Planning

ARC-406 · A 2000 m² plot has FAR 2.0, 40% ground coverage and a 15 m height limit. What is the maximum built-up area and how many floors fit?

Maximum built-up area = 2000 × 2.0 = 4000 m²; maximum footprint = 800 m². Floors needed = 4000/800 = 5. With about 3 m floor-to-floor, 5 floors = 15 m, which just meets the height limit.

ARC-407 · How do you check if a proposed building meets setback rules?

Identify setbacks for the plot size and building height from bye-laws (front, rear and sides), measure from plot boundaries, and check projections, balconies and basements against allowed encroachments.

ARC-408 · How do you plan parking for a commercial building using bye-laws?

Calculate required ECS based on built-up area and use, then design parking layouts with aisle widths, ramps (slope limits), turning radii and visitor and accessible spaces. Consider mechanical parking where space is limited.

ARC-409 · How would you get approvals for a high-rise residential project?

Prepare drawings meeting bye-laws, then obtain approvals from the local authority, fire department NOC, airport authority height clearance if needed, environmental clearance for large projects, and utility connections, then a completion and occupancy certificate.

ARC-410 · How do you incorporate fire code requirements early in design?

Determine occupancy and height classification, then plan staircases, exits, travel distances, fire-fighting shafts, refuge areas and fire tender access at concept stage, since these strongly affect the building's layout.

ARC-411 · How do you make an existing public building compliant with accessibility law?

Audit it against the Harmonised Guidelines and RPwD Act requirements, then prioritise step-free access (ramps, lifts), accessible toilets, door widths, signage, tactile paths and parking. Where full compliance is impossible, document reasonable alternatives.

ARC-412 · How do you decide whether a project needs environmental clearance?

Check built-up area thresholds under the EIA Notification (for example building projects above 20,000 m² need State-level clearance), then prepare documents covering water, energy, waste, traffic and green cover, and follow monitoring conditions.

ARC-413 · How do you use TDR or premium FAR in a project?

Check local rules on where TDR can be loaded and premium FAR purchased, its cost and limits, then test whether extra area pays back after infrastructure, parking and fire requirements that may increase with height and size.

ARC-414 · How do you prepare a building for an occupancy certificate inspection?

Ensure the as-built matches approved drawings, complete fire systems with testing certificates, lifts certified, structural stability certificate, water and drainage connections, and any NOCs obtained, with documentation ready for inspectors.

ARC-415 · How would you plan a site layout to meet planning rules and maximise value?

Test massing options within FAR, coverage, setbacks and height limits, place cores for efficient floor plates, plan parking and fire access, and compare saleable area, cost and quality for each option.

BIM, Digital Tools & Project Management

ARC-416 · How would you implement BIM on a medium-sized building project?

Agree a BIM Execution Plan defining uses, LOD by stage, software, naming and coordination procedures, set up a common data environment, assign model owners, run regular clash detection and coordination meetings, and link models to quantities and schedules.

ARC-417 · How do you run a clash detection and resolution workflow?

Federate discipline models, run clash tests by system pairs (structure vs MEP, MEP vs MEP) with tolerances, group and prioritise clashes, assign them to responsible parties in a tracking tool, and recheck after updated models until resolved.

ARC-418 · How do you calculate the critical path for a small project?

List activities with durations and dependencies, do a forward pass for earliest start and finish, a backward pass for latest times, and compute float. Activities with zero total float form the critical path, which sets project duration.

ARC-419 · A project has EV = ₹80 lakh, PV = ₹100 lakh and AC = ₹90 lakh. Interpret its performance.

SPI = EV/PV = 0.8, so the project is behind schedule; CPI = EV/AC = 0.89, so it is over budget. Corrective actions are needed on both schedule and cost.

ARC-420 · How do you use 4D BIM for construction planning?

Link model elements to the schedule to visualise construction sequence over time, check logistics, crane coverage and site conflicts, and communicate the plan to stakeholders.

ARC-421 · How do you handle design changes during construction?

Assess the impact on cost, schedule and other systems, issue formal change orders with approvals, update drawings and models, and communicate changes to all parties.

ARC-422 · How would you reduce delays on a building project?

Plan early procurement of long-lead items, use lookahead planning, manage approvals and design information on time, track progress weekly, and address bottlenecks proactively.

ARC-423 · How do you set up a BIM model for facility management handover?

Include asset data (manufacturer, model, warranties, maintenance schedules) in COBie or similar formats, verify model accuracy against as-built conditions, and integrate with the CAFM system.

ARC-424 · How do you estimate a project's cost at concept stage?

Use cost per square metre benchmarks adjusted for building type, quality, location and complexity, then refine with elemental estimates as design develops.

ARC-425 · How do you manage risk on a construction project?

Identify risks (design, site, contracts, supply chain), assess likelihood and impact, assign owners and mitigation actions, keep a risk register and review it regularly, with contingency in cost and schedule.

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