Part 1 of 2
Building Planning, Orientation & Bye-laws
Last reviewed 16 Sept 2026 · Facts as of 16 Sept 2026 · 11 min read
Principles of building planning
| Principle | Meaning |
|---|---|
| Aspect | Arrangement of doors and windows in external walls so that rooms receive natural light, air, sunshine and view according to their use (e.g. morning sun in kitchen, cool light in study) |
| Prospect | The view from the building and the impression the building creates from outside — windows placed to enjoy good views and conceal undesirable ones |
| Privacy | External privacy — from neighbours and streets (placement of openings, boundary walls, screens); internal privacy — between rooms (bedrooms and toilets not visible from living or entrance areas; door positions) |
| Grouping | Arranging rooms according to functional relationships — e.g. kitchen near dining; toilets near bedrooms; entrance leading to living room |
| Roominess | Getting the maximum usefulness from a given area — proper proportions (length to breadth ratio commonly about 1.2 to 1.5), avoiding waste and awkward corners |
| Furniture requirements | Room sizes and door/window positions planned to accommodate required furniture with movement space |
| Sanitation | Adequate lighting, ventilation, cleanliness and sanitary conveniences; damp-free, hygienic spaces |
| Flexibility | Rooms that can serve more than one purpose or be adapted in future |
| Circulation | Horizontal (passages, corridors, lobbies) and vertical (stairs, lifts, ramps) movement — short, direct, independent access to rooms without passing through others; circulation areas kept economical |
| Elegance | Pleasing appearance — proportion, symmetry, materials, elevation treatment |
| Economy | Minimum cost consistent with function — compact plans, standard sizes, local materials, phased construction |
| Practical considerations | Strength, stability, durability, maintenance, services and future expansion |
Site selection for a residential building
- Good locality — pleasant surroundings, security, neighbourhood facilities (schools, hospitals, markets, transport).
- Level, well-drained land above flood level; not low-lying or filled-up ground.
- Good soil with adequate bearing capacity; low water table.
- Access to roads and availability of services — water supply, sewerage, electricity, telecommunication.
- Open surroundings — good light, ventilation and view; away from noise, smoke and industrial pollution.
- Legal aspects — clear title, permitted land use under the master plan, bye-laws.
- Cost of land and development.
Orientation of buildings
Orientation is the placement of the building with respect to the sun path and prevailing winds to achieve thermal comfort, natural lighting and ventilation.
Sun and heat
- In India (northern hemisphere, tropical to sub-tropical latitudes), the sun is mostly in the southern sky, rising in the east and setting in the west.
- East and west walls receive intense low-angle morning and afternoon sun that is difficult to shade — so longer walls are preferably oriented to face north and south, with the shorter walls facing east and west.
- South-facing openings can be shaded effectively by horizontal overhangs (chajjas) in summer while admitting low winter sun; north light is diffuse and glare-free (studios, workshops).
- Service areas (stairs, toilets, stores) can be placed on the west as buffer zones in hot climates.
Wind and ventilation
- Openings placed to catch the prevailing breeze (in many parts of India, south-westerly winds in summer and monsoon), with inlets on the windward side and outlets on the leeward side (cross-ventilation); outlet area preferably equal to or greater than inlet area.
- Building oriented within about 30–45° of the wind direction still achieves good cross-ventilation.
Shading devices
Horizontal devices (chajjas, overhangs) — effective for south openings; vertical devices (fins) — effective for east and west when combined with horizontal elements (egg-crate); louvers, jaalis, verandahs, trees and pergolas.
Climatic zones of India (for building design)
| Climate | Design strategies (typical) |
|---|---|
| Hot and dry | Compact plans, courtyards, thick walls with thermal mass, small openings, light-coloured surfaces, shading, evaporative cooling |
| Warm and humid | Maximum cross-ventilation, open plans, large shaded openings, lightweight construction with low thermal mass, raised floors, wide overhangs |
| Composite | Combination of strategies for hot–dry summers, humid monsoon and cool winters — adjustable shading and ventilation, insulation |
| Temperate | Moderate shading and ventilation |
| Cold (cloudy or sunny) | Compact form, insulation, south-facing glazing for solar heat gain, air-tightness, thermal mass for heat storage |
Functional planning of residential buildings
- Zoning — living zone (drawing, dining, verandah), sleeping zone (bedrooms, dressing, toilets) and service zone (kitchen, store, utility, washing, toilets) — with appropriate relationships and privacy.
- Room relationships — entrance → living → dining → kitchen; bedrooms with attached or nearby toilets; kitchen near the back entrance/utility.
- Circulation — minimise corridor areas while providing independent access.
- Services — plumbing grouped (kitchen and toilets vertically aligned in multi-storey buildings), electrical layout, drainage.
- Types of residential buildings — detached, semi-detached, row (terraced) houses, flats/apartments (walk-up and high-rise).
Building bye-laws and regulations
Building bye-laws are rules framed by local authorities (municipal corporations, development authorities) to regulate building construction for health, safety, convenience and orderly urban development.
Objectives
- Ensure structural safety and fire safety.
- Provide adequate light, ventilation and sanitation.
- Prevent overcrowding and haphazard development; protect neighbours' rights to light and air.
- Maintain the planned character of areas (land use, density, heights).
- Provide parking, access and services; accessibility for persons with disabilities.
National references include the National Building Code of India (SP 7), BIS codes, the Model Building Bye-Laws (MBBL, 2016) issued by the Town and Country Planning Organisation, and state or city-specific bye-laws (e.g. unified bye-laws of large cities). Actual values vary by authority and are revised periodically.
Typical controls
| Control | Description |
|---|---|
| Floor area ratio (FAR) / floor space index (FSI) | Total built-up floor area on all floors ÷ plot area — controls density and intensity of development |
| Ground coverage | Built-up area at ground level as a percentage of plot area — controls open space |
| Setbacks (open spaces) | Minimum distances of the building from front, rear and side plot boundaries — light, air, fire access |
| Building line and control line | Lines along roads beyond which construction is not permitted |
| Height of building | Limited with respect to road width, setbacks, zone (and airport/heritage restrictions); high-rise buildings need additional fire and structural requirements |
| Minimum sizes of rooms | Commonly prescribed in model bye-laws — e.g. a habitable room of about 9.5 m² with minimum width about 2.4 m; kitchen about 5.0 m² with width about 1.8 m; bathroom about 1.8 m² (width about 1.2 m); WC about 1.1 m² (width about 0.9 m) |
| Minimum heights | Habitable rooms commonly about 2.75 m clear height (lower heights permitted for bathrooms, WCs, passages, stores — about 2.1–2.2 m) |
| Lighting and ventilation | Openings (windows, ventilators) commonly not less than about one-tenth of the floor area of habitable rooms (often one-sixth in hot climates as per some regulations); no part of a room too far from an opening |
| Plinth height | Minimum height of ground floor above the adjoining ground/road level (commonly about 0.45 m or more) — protection from dampness and flooding |
| Staircases | Minimum widths depending on building type; limits on risers (maximum height) and treads (minimum width), headroom, handrails; number of staircases and fire escapes for tall buildings |
| Parking | Minimum car/two-wheeler parking spaces per dwelling unit or per floor area |
| Accessibility | Ramps (commonly with a gradient not steeper than about 1 in 12), accessible toilets, lifts, signage — as per harmonised accessibility guidelines |
| Fire safety | Fire exits, fire-resistant construction, firefighting installations — per fire authority norms and NBC Part IV |
| Services and sanitation | Water supply, drainage, rainwater harvesting, solid waste storage, septic tanks where sewers are absent |
| Structural safety and seismic design | Compliance with IS codes (loads, earthquake, wind) and certification by qualified engineers |