Urban design and planning

In short

Urban design is the design of the space *between* buildings — streets, squares, blocks, edges and public realm — at a scale larger than a single building but smaller than a region; urban planning is the statutory allocation of land use, density, infrastructure and development rights over a city or region over time. B.Arch students need both because every Indian building is designed inside a development control regulation (DCR) envelope set by a planning authority, and campus recruiters in architecture, urban design and real-estate consultancy test FAR/ground-coverage/density arithmetic in the first technical round. Examined in university Town Planning and Urban Design papers, in GATE AR (Part B: urban design, landscape and planning), and in the Council of Architecture-prescribed professional practice papers. Applied daily in DCR feasibility studies, master plans, layout approvals, Smart City and AMRUT projects, and in roles at HUDCO, NBCC, state development authorities, CEPT/SPA-linked consultancies and private firms.

Explained

Definitions, scale and scope

• Urban design: the three-dimensional design of groups of buildings and the public realm — massing, street sections, enclosure, pedestrian movement, visual quality. It is normative and spatial.
• Urban planning (town and country planning): the legal and policy process of deciding land use, intensity, services and phasing — statutory and quantitative.
• Scale ladder: building → urban design project (a few hectares to a precinct) → local area plan / zonal plan → development (master) plan for a city → regional plan (e.g. NCR Regional Plan) → state/national settlement policy.
• Core urban design dimensions (widely used teaching framework): morphological (block and plot pattern), perceptual (image, legibility), social (who uses it), visual (aesthetics), functional (movement, mix), temporal (change over time).
• Public realm: streets, chowks, maidans, ghats, bazaars, parks — in Indian cities the street is also a market, workplace and festival ground, so a purely vehicular street section fails.

History of city form and planning thought

• Ancient Indian: Mohenjo-daro and Harappa — gridded streets, citadel and lower town, covered drains, standardised brick. *Manasara* and *Mayamata* Vastu-shastra town types (*dandaka, sarvatobhadra, nandyavarta, padmaka, swastika, prastara, karmuka, chaturmukha*) with grid streets, *brahmasthana* at centre.
• Medieval: Jaipur (1727, Vidyadhar Bhattacharya) — nine-square grid, chaupars, 33 m-wide main bazaars, uniform façades: India's finest pre-modern planned city. Fatehpur Sikri, Shahjahanabad (Chandni Chowk axis with central canal).
• Colonial: cantonment + civil lines + native town triad; Lutyens' and Baker's New Delhi (1911-31) — Beaux-Arts hexagonal grid, axial vistas, bungalow plots, very low density; Improvement Trusts (Bombay 1898 after plague, Calcutta 1911).
• Industrial reaction: Ebenezer Howard's Garden City (1898, *Tomorrow / Garden Cities of To-morrow*) — 32,000 people (30,000 in the town plus 2,000 on the farm belt) on 1,000 acres of town within a 6,000-acre estate, the remaining 5,000 acres being the agricultural greenbelt, greenbelt, social city cluster; built at Letchworth and Welwyn.
• Patrick Geddes — "diagnostic survey before plan", conservative surgery (applied in Indian town reports, Indore 1918); survey-analysis-plan method still the exam answer for the planning process.
• Clarence Perry's neighbourhood unit (1929): 5,000 people, elementary school at centre, 400 m (quarter-mile) walk radius, arterial roads at the edges not through it, 10% open space, shops at corners.
• Radburn (1929, Stein and Wright): superblock, cul-de-sac, complete pedestrian-vehicular segregation, houses turned to face green spines.
• Le Corbusier: Ville Radieuse, CIAM and the Athens Charter (1933) — functional zoning into dwelling, work, recreation, circulation; built at Chandigarh (1951-, after Mayer and Nowicki) — 800 × 1200 m sectors, 7V road hierarchy (V1 fast to V7 footpath; V8 cycle added later), Capitol Complex, leisure valley. Gandhinagar (1965, Apte/Mewada) follows a similar sector grid.
• Critiques: Jane Jacobs (*Death and Life of Great American Cities*, 1961) — mixed use, short blocks, aged buildings, density, "eyes on the street"; Christopher Alexander ("A city is not a tree"); Gordon Cullen's townscape / serial vision; Kevin Lynch (*The Image of the City*, 1960) — paths, edges, districts, nodes, landmarks, and imageability; Camillo Sitte on enclosed squares.
• Later movements: New Urbanism and TND (Duany, Plater-Zyberk), transect zoning and form-based codes; Compact city; Transit-Oriented Development; tactical urbanism and placemaking; Charles Correa's "Open to Sky Space", Belapur incremental housing, Navi Mumbai (CIDCO) as India's largest planned new town; Laurie Baker's cost-effective low-rise urbanism.

Planning instruments, process and Indian law

• Constitutional base: "Land" and "local government" are State subjects (List II), so each state has its own Town and Country Planning Act (e.g. Maharashtra Regional and Town Planning Act 1966, Karnataka TCP Act 1961, UP Urban Planning and Development Act 1973, Delhi Development Act 1957).
• 74th Constitutional Amendment Act, 1992 — inserted Part IXA, Twelfth Schedule: urban planning including town planning, regulation of land use, roads, water, slum upgradation devolved to municipalities; Ward Committees, District Planning Committees (Art. 243ZD) and Metropolitan Planning Committees (Art. 243ZE) for areas above 10 lakh population.
• Plan hierarchy under URDPFI Guidelines, 2014 (Urban and Regional Development Plans Formulation and Implementation, MoHUA — revision work has been ongoing, so cite the 2014 edition): Perspective Plan (20-30 yr, policy) → Regional Plan → Development Plan (20-25 yr, statutory land use) → Local Area Plan / Town Planning Scheme → Annual Plan and projects; plus Special Purpose Plans (heritage, disaster, CDP).
• Statutory sequence of a development plan: declaration of intention → existing land-use survey and base map → draft plan published for objections → public hearing → modification → state government sanction → notification and enforcement → mandatory revision (commonly 10 or 20 years, varies by state Act).
• Zoning: dividing the plan area into use zones (residential R, commercial C, industrial I, public and semi-public PS, transport T, recreational, agricultural, special area) with permitted/permissible-with-permission/prohibited uses, plus bulk controls (FAR, height, setbacks, coverage) and overlay zones (heritage, TOD, airport funnel, CRZ).
• Development control regulations / building bye-laws: state DCPR (e.g. Maharashtra UDCPR 2020 for most of the state; Mumbai DCPR 2034) and the Model Building Bye-laws 2016 (MoHUA) which municipalities adapt; the National Building Code of India 2016 (NBC, SP 7), Part 3 Development Control and Part 4 Fire and Life Safety, governs open spaces, means of access, means of egress and high-rise provisions.
• Land assembly and value capture: acquisition under the Right to Fair Compensation and Transparency in Land Acquisition, Rehabilitation and Resettlement Act, 2013 (consent and social impact assessment, solatium, R&R); Town Planning Scheme / land pooling (Gujarat model, Delhi land pooling policy, Amaravati); Transferable Development Rights (TDR); premium/chargeable FSI; betterment levy; accommodation reservation; development/impact fees.
• Other statutes that bind design: RERA (Real Estate (Regulation and Development) Act, 2016) — registration, carpet-area disclosure, sanctioned-plan changes need two-thirds allottee consent; Environment (Protection) Act 1986 and the EIA notification (built-up thresholds for environmental clearance); CRZ Notification 2019 (CRZ-I to IV, No Development Zone along the coast); Ancient Monuments Act and AMASR Amendment 2010 — 100 m prohibited and next 200 m regulated area around protected monuments; Wetlands Rules 2017; Solid Waste Management Rules 2026 (replaced the 2016 Rules from 1 April 2026); Rights of Persons with Disabilities Act 2016 with the Harmonised Guidelines for Barrier-Free Built Environment (2021) for universal design.
• Missions and programmes: Smart Cities Mission (2015, 100 cities — area-based retrofit/redevelopment/greenfield + pan-city ICT, SPVs; the mission period concluded with projects largely completed and now folded into city-level operations); AMRUT and AMRUT 2.0 (water, sewerage, septage, green spaces); PMAY-Urban (ISSR, AHP, BLC, CLSS) and PMAY-U 2.0; HRIDAY and PRASHAD (heritage); SBM-Urban; PM e-Bus Sewa, FAME/PM E-DRIVE for urban mobility; National TOD Policy 2017 and Metro Rail Policy 2017 (mandates TOD, multimodal integration and alternative analysis for metro proposals); National Urban Transport Policy 2006 (move people, not vehicles); Climate Smart Cities Assessment Framework; Ease of Living Index and Municipal Performance Index.

Urban design elements and quantitative controls

• Figure-ground, block and plot: small blocks (60-120 m) and fine-grained plots give walkability and active frontage; superblocks give privacy but long walks and gated edges.
• Enclosure ratio: street height-to-width (H:W) of about 1:1 to 1:2 reads as a comfortable "room"; wider than 1:4 the street loses definition. For squares, Sitte's rule is that the plaza dimension should be between one and two times the height of its principal building (about 1:1 to 1:2), with enclosure largely lost beyond about 1:4.
• Road hierarchy: expressway → arterial → sub-arterial → collector → local/access street. IRC practice with indicative right-of-way: arterial 50-60 m or more, sub-arterial 30-40 m, collector 20-24 m, local street 10-18 m; service lanes and shared streets below that. IRC:86 (urban roads geometric design) and IRC:103 (pedestrian facilities — footpath min 1.8 m clear, more on shopping streets) are the codes to quote.
• Density measures: gross residential density (DU or persons per hectare of total area, including roads and open space) vs net residential density (per hectare of residential plot only). Indian norms (URDPFI) broadly: low 75-150 pph, medium 150-250, high 250-400 and above; hilly and congested cores differ.
• Bulk controls: FAR/FSI, ground coverage, setbacks, height limits (also controlled by airport funnel zones and fire-tender access), parking ratios (ECS per 100 m² built-up), open-space reservation (commonly 10-15% of layout area as recreational open space), amenity space.
• Social infrastructure norms (URDPFI, per population): primary school ~1 per 5,000; senior secondary ~1 per 7,500-10,000; dispensary ~1 per 15,000; nursing home/intermediate hospital ~1 per 1 lakh; convenience shopping per 5,000; community hall and park at neighbourhood level. Numbers vary slightly by state plan — always say which document you are quoting.
• Water and services planning benchmarks (CPHEEO): domestic water supply 135 lpcd for cities with sewerage (70-100 lpcd for smaller towns), sewage generation about 80% of supply, per-capita MSW roughly 0.3-0.6 kg/day depending on city size.
• Urban design process: context and site appraisal (survey, SWOT, morphology) → vision and design brief → concept and structure plan (movement, use, open space, built form) → urban design framework with design guidelines and regulating plan → phasing, costing, implementation and management.

Contemporary Indian issues

• TOD: intensify a 500-800 m walkable catchment around transit stations with higher FAR, mixed use, small blocks, parking caps and last-mile connectivity (Delhi, Ahmedabad, Nagpur, Navi Mumbai metro corridors).
• Informality: 65+ million people in slums/informal settlements (Census 2011 order of magnitude; current figures are higher and contested); in-situ upgradation and incremental housing generally outperform peripheral resettlement, which destroys livelihood access.
• Climate and resilience: urban heat island mitigation (shade, albedo, trees), blue-green infrastructure, sponge-city stormwater, mandatory rainwater harvesting and dual plumbing in most bye-laws, ECBC/ENS (Eco-Niwas Samhita) for building energy, flood-plain and lake-bed protection after Chennai 2015 and Bengaluru floods.
• Informal economy in design: vending zones are a legal requirement under the Street Vendors (Protection of Livelihood and Regulation of Street Vending) Act, 2014 — Town Vending Committees and vending plans; good street design accommodates hawkers rather than evicting them.
• Tools: GIS and remote sensing for land-use mapping, Master Plan GIS portals, BIM-to-city CIM, mobility surveys and traffic modelling, space syntax for connectivity, Form-Based Codes replacing use-only zoning in some Indian pilots.

Key points

• Urban design - three-dimensional design of the public realm and building groups; planning - statutory allocation of use, density and infrastructure.
• FAR/FSI - total built-up floor area ÷ plot area; controls bulk, not shape; height and coverage shape the same FAR very differently.
• Ground coverage - footprint ÷ plot area, expressed as %; low coverage + high FAR gives towers in open space.
• Neighbourhood unit (Perry) - 5,000 people, 400 m walk to a central school, through traffic kept to the edge, 10% open space.
• Garden City (Howard) - self-contained town of about 32,000 with a permanent greenbelt and shared land ownership.
• Radburn principle - superblock with cul-de-sacs and full pedestrian-vehicle segregation.
• Lynch's five elements - paths, edges, districts, nodes, landmarks; together they create imageability.
• Chandigarh - Le Corbusier's sector city, 800 × 1200 m sectors, 7V road hierarchy, Capitol Complex.
• Jaipur 1727 - nine-square grid with chaupars and wide uniform bazaars; India's model pre-colonial planned city.
• URDPFI Guidelines 2014 - national framework for the plan hierarchy: Perspective, Regional, Development, Local Area and Annual plans.
• 74th Amendment 1992 - devolved urban planning to ULBs (functions listed in the Twelfth Schedule) and created DPCs (Art. 243ZD) and MPCs (Art. 243ZE).
• Zoning - use zones plus bulk controls; overlays handle heritage, TOD, airport and coastal constraints.
• TDR and premium FSI - value-capture tools that let a landowner build elsewhere or pay for extra FSI.
• LARR Act 2013 - consent, SIA, compensation multiplier and R&R for land acquisition.
• NBC 2016 (SP 7) - Part 3 development control and Part 4 fire safety set open spaces, access widths and egress.
• Gross vs net density - gross includes roads and open space; net counts only residential plot area, so net is always higher.
• H:W enclosure ratio - about 1:1 to 1:2 for a well-defined street; mixed ground-floor frontage keeps it alive.
• TOD catchment - 500-800 m walk shed around a station, densified with mixed use and parking caps.

Formulas and examples

Example 1 - FAR, coverage and floors. A plot of 2,400 m² in a zone with FAR 2.0 and permissible ground coverage 40%.

• Permissible built-up area = 2.0 × 2,400 = 4,800 m².
• Maximum footprint = 0.40 × 2,400 = 960 m².
• Floors needed = 4,800 ÷ 960 = 5 floors (if the client wants only 4 floors, each floor must average 1,200 m² — which exceeds the 960 m² coverage cap, so 4 floors is not possible).
• Balance open plot = 2,400 − 960 = 1,440 m² (60%) for setbacks, parking and landscape.

Example 2 - gross vs net density. A residential layout of 20 ha: 12 ha residential plots, 4 ha roads, 2 ha open space, 2 ha schools and shops. It has 1,800 dwelling units at an average household size of 4.5.

• Population = 1,800 × 4.5 = 8,100 persons.
• Gross density = 8,100 ÷ 20 = 405 pph (and 1,800 ÷ 20 = 90 DU/ha).
• Net residential density = 8,100 ÷ 12 = 675 pph (150 DU/ha).
• Check against norms: 405 pph gross is a high-density layout; URDPFI medium-density guidance is roughly 150-250 pph, so this needs justification on infrastructure capacity.

Example 3 - neighbourhood sizing from Perry's principle. Design a neighbourhood for 5,000 people at a gross density of 250 pph.

• Area = 5,000 ÷ 250 = 20 ha.
• If roughly square, side = √200,000 = 447 m, so the farthest corner is about 316 m from the centre (447 × 0.707) — within Perry's 400 m walk, so a single central school works.
• Open space at 10% = 2 ha. Primary schools at 1 per 5,000 → 1 primary school; convenience shopping at 1 unit per 5,000 → 1 cluster.
• Water demand at 135 lpcd = 5,000 × 135 = 6,75,000 litres/day = 675 m³/day; sewage ≈ 0.80 × 675 = 540 m³/day.

Example 4 - TDR / premium FSI feasibility. A 1,000 m² plot has base FSI 1.33; the DCR allows 0.5 extra by purchasing TDR at ₹18,000 per m² of TDR area, and the finished sale rate is ₹85,000 per m².

• Extra built-up area = 0.5 × 1,000 = 500 m².
• TDR cost = 500 × 18,000 = ₹90,00,000 (₹90 lakh).
• Gross sale value of the extra area = 500 × 85,000 = ₹4.25 crore.
• Net of TDR cost = 4.25 crore − 0.90 crore = ₹3.35 crore before construction cost; at a construction cost of ₹30,000/m² (= ₹1.50 crore), the margin is ₹1.85 crore — hence the strong market for TDR in Mumbai and Pune.

Example 5 - population projection for a plan horizon. A town's population was 1,20,000 in 2001 and 1,56,000 in 2011. Project to 2031 (two decades beyond 2011).

• Decadal growth r = (1,56,000 − 1,20,000)/1,20,000 = 0.30 (30%).
• Geometric projection: 1,56,000 × 1.30² = 1,56,000 × 1.69 = 2,63,640.
• Arithmetic projection: increment 36,000 per decade → 1,56,000 + 2 × 36,000 = 2,28,000.
• A 20-year development plan would therefore size land and services for roughly 2.3-2.6 lakh people; at 200 pph the residential land needed is about 2,63,640 ÷ 200 ≈ 1,318 ha (geometric case).

Where it is used

• State development authorities and ULBs (DDA, MMRDA, CIDCO, BDA, HMDA, GDA, municipal town planning departments): preparing and enforcing development plans, zoning certificates, layout and building permissions.
• Urban design and planning consultancies and PSUs (HUDCO, NBCC, RITES, WAPCOS, Egis/AECOM India, CEPT Research, large architecture firms): master plans, City Mobility Plans, DPRs for AMRUT and Smart City area-based development, heritage precinct plans (Ahmedabad World Heritage City, Varanasi, Jaipur).
• Real estate and project management roles: DCR/FSI feasibility and highest-and-best-use studies, RERA documentation, township approvals under state Township Policies — the daily job of an architect in a developer's design cell.
• Transport and infrastructure: metro station-area and TOD plans, BRTS corridors (Ahmedabad Janmarg, Indore), complete-street and non-motorised transport retrofits (Pune, Chennai street design guidelines).
• Public-realm and placemaking projects: riverfronts (Sabarmati, Kashi Vishwanath corridor), lake and ghat revitalisation, market redevelopment, pedestrianisation pilots.
• Job roles that test this content: urban designer, town planner (ITPI associateship is the planning credential; Council of Architecture registration for architects), GIS analyst, housing and slum-upgradation specialist, sustainability consultant (IGBC/GRIHA for large developments and townships).

Interview questions

• Q: What is the difference between FAR and ground coverage? A: FAR is total built floor area divided by plot area and limits overall bulk; ground coverage is the footprint as a percentage of the plot and limits how much ground is built upon. The same FAR can be a low spread-out block or a slim tower depending on coverage.
• Q: If FAR is 2.0 and coverage is 25%, how many floors can you build? A: About 2.0/0.25 = 8 floors, assuming every floor uses the full permissible footprint and no FAR-exempt areas.
• Q: What is the neighbourhood unit and is it still valid in India? A: Perry's 1929 school-centred cell of about 5,000 people within a 400 m walk, with through traffic on the perimeter. The walkability and social-infrastructure logic still drive URDPFI norms, but its single-use, inward-looking form is criticised for killing street life and mixed incomes.
• Q: Explain Kevin Lynch's elements of city image. A: Paths, edges, districts, nodes and landmarks — the mental-map components people use to navigate; a city with strong, clear elements has high imageability.
• Q: What did the 74th Constitutional Amendment change for planning? A: It gave constitutional status to urban local bodies and listed urban planning, land-use regulation and slum upgradation in the Twelfth Schedule, mandating District and Metropolitan Planning Committees.
• Q: Difference between a master/development plan and a Local Area Plan? A: The development plan is a city-wide statutory land-use and infrastructure plan for 20-25 years; a Local Area Plan is a detailed, site-specific plan for a small precinct that works out streets, plots, services and built form within the development plan's framework.
• Q: What is TDR and why do cities use it? A: Transferable Development Rights let an owner who surrenders land for a public purpose, or cannot build on it (heritage, reservation), build extra floor area elsewhere. It lets the authority acquire land without cash — but it loads density onto receiving zones, so DCRs cap where TDR may land.
• Q: What is Transit-Oriented Development and what makes it fail? A: Densifying a 500-800 m walkable catchment around transit with mixed use and reduced parking. It fails when only FAR is increased without footpaths, street crossings, feeder services and parking caps — you then get high-density car dependence.
• Q: Why is Chandigarh criticised despite being well planned? A: Rigid functional zoning and very large sectors produce low street activity, long walking distances and car dependence, with little room for the informal economy that Indian cities run on.
• Q: Which code governs open spaces, access widths and egress for a high-rise? A: The National Building Code of India 2016 (SP 7) — Part 3 for development control and open spaces and Part 4 for fire and life safety — read with the state DCR and Model Building Bye-laws 2016.
• Q: How would you compute the population a development plan must plan for? A: Project the base census population to the plan horizon by arithmetic, geometric or incremental-increase methods (plus migration and employment assumptions), cross-check against land and infrastructure capacity, and adopt a range rather than a single figure.
• Q: A client's site abuts a protected monument — what applies? A: Under the AMASR Act as amended in 2010, 100 m around a centrally protected monument is a prohibited area for construction and the next 200 m is regulated, requiring National Monuments Authority clearance; state heritage rules may add more.
• Q: What is the main limitation of use-based zoning, and what is the alternative? A: It separates uses and ignores built form, creating long commutes and dead zones; form-based codes regulate street frontage, height and envelope instead, allowing mixed use within a controlled form.

Common mistakes

• Treating FAR and ground coverage as the same control, or forgetting that balconies, parking, service floors and some staircases are FAR-exempt in many DCRs — so the achievable area differs from the raw FAR number.
• Quoting gross and net density interchangeably; always state which area is in the denominator (gross includes roads and open space).
• Writing "master plan" for every plan — exams expect the URDPFI hierarchy (Perspective, Regional, Development, Local Area, Annual) and the correct statutory status.
• Attributing Chandigarh's plan only to Le Corbusier without the Mayer-Nowicki original, or confusing Howard's Garden City with Perry's neighbourhood unit.
• Using generic international norms when the paper asks for Indian figures — quote URDPFI 2014, NBC 2016, CPHEEO and the relevant state DCR instead.
• Designing a street section with footpaths and no vending or parking provision — Indian streets carry hawkers (Street Vendors Act, 2014), autos and loading, and the design must absorb them.
• Arithmetic slips in unit conversion: lpcd to m³/day, m² to hectares (1 ha = 10,000 m²), and persons per hectare versus dwelling units per hectare.
• Ignoring overlay constraints — CRZ, airport funnel, heritage buffer, flood plain — which often cut the permissible envelope far below the base zoning allowance.

Related topics

Architectural design principles · Landscape architecture · Building bye-laws and development control regulations · Housing and affordable housing policy · Urban transport and infrastructure planning · Sustainable and green building design (GRIHA, IGBC, ECBC)