AI Prompts for Urban Design Concepts & Masterplanning

Urban design operates at the intersection of architecture, planning policy, transport engineering, ecology, and economics. A masterplan brief might ask you to balance 500 dwellings per hectare with meaningful public space, accommodate a bus interchange while creating pedestrian-priority streets, and hit a biodiversity net gain target -- all on a former industrial site with contaminated land.

The research phase alone can eat weeks. Policy documents, density precedent studies, transport capacity assessments, sunlight analysis, housing mix calculations. AI won't draw your masterplan, but it can compress the research and analysis phase dramatically, generate concept narratives for competition entries, and help you visualize ideas before committing to CAD.

Here are tested prompts for every phase of urban design work, from site analysis through to competition submissions.

Site Analysis and Context Research Prompts (ChatGPT)

These prompts help you understand a site before putting pen to paper.

"I'm preparing a site analysis for a [size, e.g., 5-hectare] urban design project at [location or general description, e.g., former industrial waterfront in a Northern European city]. Generate a comprehensive site analysis checklist organized by: physical context (topography, microclimate, flood risk, contamination), movement context (existing roads, pedestrian routes, public transport, cycling infrastructure), social context (surrounding demographics, community facilities, deprivation data), policy context (relevant planning policies, design codes, heritage designations), and ecological context (existing habitats, trees, water features). For each item, suggest the data source."

"Summarize the urban design principles from [policy document, e.g., the National Design Guide (UK) / Form-Based Codes (US) / CABE Building for Life 12]. Extract the 10 most relevant principles for a [project type, e.g., mixed-use neighborhood on a brownfield site] and explain how each principle translates into a specific design response. Present as: Principle, What It Means in Practice, Design Response."

"Analyze the street network typology of [neighborhood or city, e.g., Barcelona Eixample / Amsterdam Jordaan / Manhattan grid]. Describe: block dimensions, street hierarchy, building-to-street relationship, ground floor uses, public space distribution, and what makes the urban grain successful. Then suggest how these principles could inform a masterplan for a [site size] site in [city]."

"I'm working on a site with [describe existing conditions, e.g., a disused rail yard, 3.2 hectares, bounded by residential terraces to the north, a river to the south, a main road to the east, and an industrial estate to the west]. Identify the key urban design opportunities and constraints of this site. For each, explain the design implication and suggest a response strategy."

"Compare the urban morphology of 5 successful mixed-use neighborhoods: [list 5, e.g., Vauban (Freiburg), HafenCity (Hamburg), King's Cross (London), Nordhavn (Copenhagen), Hudson Yards (New York)]. For each: density (dwellings per hectare), block structure, public space ratio, ground floor mix, car parking approach, and the one thing that makes it distinctive. Present as a comparison table."

Density and Massing Prompts (ChatGPT)

Density calculations and massing strategies are where masterplans succeed or fail.

"I need to accommodate [X dwellings] on a [Y hectare] site, which is [Z dwellings per hectare]. Suggest 3 massing strategies that achieve this density with different urban characters: 1) perimeter block with courtyard gardens, 2) tower-and-podium, 3) terraced streets with mews. For each strategy, describe: typical building heights, site coverage percentage, private amenity space approach, parking solution, and the qualitative character of the streets and spaces created."

"Calculate the development capacity of a [site area] site under these constraints: maximum building height [X stories], minimum 30% public open space, maximum 50% site coverage, parking ratio of [0.5/1.0/1.5] spaces per dwelling. Show: gross site area, net developable area, approximate GIA achievable, estimated dwelling count (assuming [X sqm] average unit size), and resulting density. Then compare this with the [local plan target density]."

"Explain how to calculate daylight and sunlight impact for a masterplan massing using the BRE guide (Site Layout Planning for Daylight and Sunlight). What are the key tests: 25-degree line, 2-hour sun-on-ground, VSC, APSH? For a site at latitude [X], what are the solar angle constraints for [north/south/east/west]-facing blocks? How do these constraints shape maximum building heights and spacing?"

"My masterplan has a target density of [X] dwellings per hectare. Show me the housing mix (by unit type) that achieves this density with a range of building typologies. Include: apartments (1-bed, 2-bed, 3-bed), townhouses, maisonettes, and any live-work units. Assume average unit sizes of [state sizes or use typical UK/US standards]. Present as a schedule with: unit type, typical GIA, count, total GIA, and percentage of total."

"Compare the density and urban character of these residential building types when applied to a [site area] site: 1) 3-story terraced houses, 2) 4-story mansion blocks, 3) 6-story perimeter blocks, 4) 12-story point towers in landscape, 5) 8-story linear blocks. For each: achievable density (dph), site coverage, green space ratio, street character, and one key urban design advantage and disadvantage."

Public Space and Landscape Prompts (ChatGPT)

"Design a hierarchy of public spaces for a [X hectare] mixed-use neighborhood accommodating [Y residents]. The hierarchy should include: a central public square, a linear park or green corridor, pocket parks within residential blocks, play areas (doorstep, local, neighborhood scale per Fields in Trust guidance), and SUDS-integrated landscape features. For each space: approximate size, function, character, edge conditions, and how it connects to the movement network."

"I'm designing a car-free residential street for a masterplan. The street is [width] meters wide. Propose a cross-section that accommodates: pedestrian footways, cycle path, street trees, surface water drainage (rain gardens or swales), seating, front garden defensible space, and emergency vehicle access. Show dimensions for each element and justify the allocation."

"Generate a planting strategy for a new public park ([X sqm]) in [climate zone/city]. Organize by: canopy trees (species, spacing, mature height), understory planting (shrubs, groundcover), meadow and wildflower areas, rain garden species, and seasonal interest plants. All species should be: native or near-native, pollinator-friendly, climate-resilient (tolerant of projected 2050 conditions), and low-maintenance. Present as a plant schedule table."

"Propose 5 distinct character areas for a [X hectare] waterfront masterplan. For each area: name, predominant use, building typology and height, public space type, key landscape feature, relationship to water, and mood/atmosphere. Explain how the sequence of character areas creates a journey along the waterfront."

"Write a public realm design code for a residential masterplan covering: street types (primary, secondary, mews, shared surface), surface materials (vehicular and pedestrian), street furniture palette, lighting hierarchy, tree planting standards (pit size, species by street type), boundary treatments, and signage/wayfinding. This should be a concise reference document that a design team can use during detailed design."

Mixed-Use Programming and Viability Prompts (ChatGPT)

"I'm preparing a mixed-use development brief for a [site area] urban site. The local plan requires: [X%] residential, minimum [Y sqm] commercial, a primary school, and a health center. Suggest a land use schedule that meets these requirements, with: use class, GIA, number of floors, approximate footprint, and location rationale (which uses go where on the site and why). Include a phasing strategy."

"Compare the economic viability of these ground floor uses for a mixed-use block in [city/area type]: 1) convenience retail, 2) cafe/restaurant, 3) flexible workspace, 4) community use (library/health), 5) residential (ground floor flats). For each: typical rent per sqm, footfall generation, activation of street frontage, evening economy contribution, and planning acceptability. Which combination would you recommend?"

"Generate a phasing strategy for a [X year, Y phase] masterplan development of [total units] dwellings and [Z sqm] commercial space. For each phase, define: which areas of the site develop first (and why), infrastructure requirements that must precede development (roads, utilities, drainage), the trigger point for delivering community facilities (school, park, health center), and the commercial logic for the sequence."

"Write a developer's brief for a single plot within a masterplan. The plot is [dimensions], zoned for [use], with a maximum height of [X stories]. Include: required frontage condition, set-back requirements, ground floor use requirement, parking provision, amenity space standards, material palette (referencing the masterplan design code), and sustainability requirements. Format as a concise brief a developer or their architect would receive."

"I need to justify the inclusion of [community facility, e.g., a new primary school / health center / community center] within a masterplan to a developer who wants to maximize residential units. Present the evidence: population thresholds that trigger facility need, planning policy requirements, how the facility adds value to surrounding residential plots, and comparable developments where community facilities increased land values."

Masterplan Visualization Prompts (Midjourney)

These generate concept-level visualizations of urban design ideas.

"Aerial view of a mixed-use urban neighborhood masterplan, perimeter block structure with green courtyards, tree-lined streets, central public square with market stalls, canal running through site, 4-6 story buildings, warm brick and timber materials, summer afternoon, photorealistic architectural visualization --ar 16:9 --s 200"

"Pedestrian-priority residential street in a new neighborhood, shared surface with flush kerbs, street trees in rain gardens, children playing, cafe seating spilling onto pavement, 4-story brick apartments, warm evening light, European urban design --ar 16:9 --s 200"

"Waterfront public promenade in a new development, timber boardwalk along river edge, stepped seating to water, mixed-use buildings behind with ground floor cafes, cycling path, native planting, overcast sky, autumn, architectural photography --ar 16:9 --s 150"

"Central public square in a masterplan development, hard landscaping with water feature, surrounded by mixed-use buildings (ground floor retail, upper residential), mature trees providing shade, people sitting on benches, market day, bird's-eye perspective --ar 1:1 --s 200"

"Car-free residential mews in a new neighborhood, narrow street with doorstep planting, colorful front doors, low-rise 3-story terraced houses, shared surface with play markings, bicycle parking, intimate scale, morning light --ar 16:9 --s 150"

"Before and after aerial view of urban regeneration: left side shows derelict industrial site with warehouses and surface car parking, right side shows the same site transformed with residential blocks, new park, and pedestrian streets. Split-screen comparison, same aerial angle --ar 16:9 --s 100"

"Section through a mixed-use urban street showing: underground parking, ground floor retail, upper floor apartments, street trees, cycle lane, pedestrian footway, building setback gardens. Technical section drawing style with color, scale figures --ar 16:9 --s 100"

Transport and Movement Prompts (ChatGPT)

"Design a movement network for a [X hectare] residential masterplan accommodating [Y dwellings]. Include: primary vehicle route (with design speed and cross-section), secondary residential streets, shared surface home zones, dedicated cycle routes, primary pedestrian routes, and connections to existing transport infrastructure ([describe nearby stations, bus routes, main roads]). Define the parking strategy: on-plot, on-street, or consolidated parking (with walking distance thresholds)."

"Calculate the trip generation for a mixed-use development of [X dwellings] and [Y sqm commercial space] using TRICS methodology. Estimate: vehicle trips per day, peak hour vehicle trips, pedestrian and cycle trips (assuming [Z%] modal split targets). Then assess whether the adjacent road network ([describe road]) has capacity for this additional traffic, and suggest mitigation measures if not."

"Propose a parking strategy for a car-lite urban neighborhood of [X dwellings]. Compare: 1) no on-site parking (car-free), 2) 0.5 spaces per dwelling (consolidated parking), 3) 1.0 space per dwelling (on-plot and on-street). For each scenario: impact on density, streetscape quality, land take, estimated cost, and planning policy compliance. What supporting measures (car club, cycle infrastructure, PT improvements) are needed for each?"

"Design a 20-minute neighborhood accessibility analysis for a [masterplan site]. List the facilities that should be reachable within a 5-minute walk, 10-minute walk, 15-minute walk, and 20-minute walk/5-minute cycle. For each walking threshold: required facilities, maximum distance (meters), and whether the masterplan site provides them or relies on existing neighborhood facilities."

Competition Entry and Narrative Prompts (ChatGPT)

"Write a 400-word urban design vision statement for a competition entry. The site is [describe: location, size, current use, surrounding context]. The masterplan proposes [describe key moves: e.g., reconnecting severed street grid, creating a central green spine, retaining heritage structures]. The narrative should communicate: the core design idea (one sentence), how the masterplan responds to site and context, the quality of life for future residents, and the legacy for the city. Avoid cliches about 'vibrant communities' and 'world-class public realm.' Be specific."

"I need 5 alternative masterplan concepts for a [site description] competition. For each concept, provide: a working title (3 words), a one-sentence core idea, the organizing spatial principle (axis, grid, cluster, ring, linear), approximate density achieved, the signature public space, and one bold design move that distinguishes it from the others. Present as a numbered list."

"Draft the 'landscape and ecology' section of a masterplan report. The site is [describe existing ecology]. The masterplan proposes: [describe proposed green infrastructure]. Write 300 words covering: ecological strategy (habitat creation, corridors, species), SUDS integration, tree strategy (retained and new), biodiversity net gain calculation approach, and seasonal landscape character. Use specific plant species and habitat types appropriate to [region]."

"Write captions for 6 masterplan competition boards. Each caption should be: 15-25 words, describe what the image shows, and communicate one design principle. Board subjects: 1) aerial masterplan view, 2) central square perspective, 3) residential street section, 4) waterfront promenade, 5) phasing diagram, 6) sustainability strategy diagram."

If you're working in urban design or looking to move into masterplanning roles, ArchGee lists urban design positions from large multidisciplinary practices to specialist urban design consultancies.

Design Code and Policy Prompts

"Draft a building height strategy for a [X hectare] masterplan with a [context, e.g., low-rise suburban context to the north, river to the south, train station to the east]. Justify the height distribution using: context sensitivity (stepping down toward existing neighborhoods), landmark and wayfinding (taller elements marking key locations), microclimate (overshadowing, wind tunnel), and character area differentiation. Present as a height parameter plan description with typical heights per area."

"Write residential amenity space standards for a masterplan design code. Define: private amenity space per unit (by unit type: flat with balcony, ground floor flat with garden, townhouse, maisonette), communal amenity space per dwelling, children's play space per child (using GLA/Fields in Trust benchmarks), and allotment/growing space provision. Include minimum dimensions for each space type."

"Generate a design code section on 'Active Frontages' for a masterplan. Define: what constitutes an active frontage (percentage of glazing, entrance frequency, use types), where active frontages are required (which streets, which building edges), permitted exceptions, and how compliance will be assessed. Include 3 examples: good active frontage, acceptable, and poor."