Gains:
- Ability to generate layout logic for artificial intelligence with clear room data, door openings and obstacles, and verify each result with scale drawing
- Ability to maintain passage width, usage share and accessibility dimensions in the layout
- Ability to catch collision and numerator errors early, knowing the weakness of artificial intelligence in scale
Space Planning and Layout: Speaking with Measurement, Accelerating with AI
The concept determines the "feel" of the space; Space planning determines "how" that space will work. Dividing a space into functions, designing transitions (circulation — the ways people move through the space), placing furniture ergonomically and safely, using light and view correctly—all of these are the subject of space planning. In this unit, we'll see how to use AI to quickly generate layout alternatives and create a dimensional checklist, but why the dimensional drawing still determines the final layout.
The basic tension here is that planning is the language of measure; AI is where it is weakest in terms of scale. AI can space out a room beautifully, but it often gets centimeters wrong. So use AI as an “idea and scenario generator” and keep the metric validation.
Step by step: from blank plan to layout
Step 1 — Clarify the data. Clear room dimensions (width × length × height), door and window positions and widths, fixed obstacles such as columns/beams, installation points (water drain, socket, radiator). No placement is realistic without this data.
Step 2 — Define functional areas. Divide the space into functions: living, dining, working, passing. Determine the approximate space needs of each area.
Step 3 — Set up circulation. Draw how people will move around the space. The main passage width is generally aimed at at least 90 cm, and in narrow passages at least 70 cm; A diameter of 90 cm is required where wheelchair access is required and ~150 cm for turning (exact values are taken from the applicable accessibility regulations).
Step 4 — Arrange furniture and maintain margins. Leave the necessary space in front of/next to each piece of furniture: ~75 cm for pulling chairs behind the dining table, ~40 cm between the sofa and the coffee table, and at least 100-120 cm between opposite counters in the kitchen.
Step 5 — Verify. Check every measurement; Test door and drawer openings, collisions, transition continuity.
Tip: When drawing the layout to the AI, write the exact dimensions of each furniture and the minimum allowances required into the prompt. Ask the AI to stick to the numbers you give it, not to an "eyeball" scale. However, check each result manually.
Measurement literacy: key margins to keep in mind
Status
Approximate minimum share
Main passage (corridor)
90cm (70cm in narrow place)
Wheelchair return
~150cm diameter
Behind the dining table (pulling chairs)
75cm
Between sofa and coffee table
40cm
Between opposite kitchen counters
100–120cm
bedside pass
60–70cm
Bench/working height
~90 cm (kitchen), ~72–75 cm (table)
These values are general reference; Exact and binding dimensions are taken from the applicable regulations and manufacturer standards. AI may remind you of these shares, but the binding source is the regulation.
Attention: The catalog size of a piece of furniture and the "usable area" it occupies in the space are different. In front of a 60 cm deep wardrobe, at least 90 cm more is required for door opening and dressing room. AI usually only considers the size of the object, omitting the usage allowance; You should add this.
three mini cases
Case 1 — Scenario production gained momentum. For a 28 m² studio flat, the designer gave the AI a layout logic based on three different living scenarios ("living alone, working from home"; "couple, hosting guests"; "minimalist, few items"). Each scenario established the bed-study-kitchen relationship differently. The designer chose the most appropriate logic and poured it into a measured drawing; conceptual exploration went from half a day to an hour.
Case 2 — Collision caught. In a narrow bathroom, YZ placed a "washing machine behind the door, sink cabinet next to it"; The visual was fine. The designer measured: the bathroom door opened inwards and the 60cm machine slammed on it. The door was made to open outwards and the machine was relocated. The AI did not take into account the door opening direction.
Case 3 — Added accessibility allowance. In a cafe design, AI spaced tables efficiently, spacing them out and leaving 65cm walkways. The venue required wheelchair access; A 90 cm passage and a turning area were mandatory. The designer reduced the number of tables and widened the passages. Regulation and access were prioritized when efficiency and accessibility conflicted.
Four copyable templates
1) Generating layout logic:
Your role: interior designer. Room: [width × length × height], door: [position, width, opening direction], window: [position, width], fixed obstacles: [column/installation]. Functions: [list]. Suggest 3 different layout LOGICs for this space. For each, give the zone distribution, circulation line and approximate size of each furniture. Leave at least 90 cm at transitions. Mark the area that does not fit as "must be verified with measurements".
2) Measurement and allowance checklist:
Check the layout below for size and usage allowance. For each piece of furniture: is its own size + the required usage allowance in front/side (door opening, drawer, passage, chair pull) sufficient? List any inadequate or overlapping points and give suggestions. Layout: [description + dimensions]
3) Circulation analysis:
Identify major transit lines and possible bottlenecks in this plan. Introduction → Is transportation to each functional area uninterrupted? How many cm is the narrowest passage? Are 90 cm passage and ~150 cm turning area provided for wheelchair access? Mark risky spots; The final decision will be confirmed by the regulation.Plan: [description]
4) Space optimization (small space):
I need to accommodate all [functions] in a small space of [m²] area. Suggest 5 concrete solutions that will save space (multifunctional furniture, vertical storage, folding/folding solutions, etc.). State the approximate size and application condition of each solution. Don't compromise on passage and comfort.
Weak prompt / Strong prompt
Weak: "Place the furniture in this room."
Strong: "A living room of 4.0 × 5.2 m, ceiling 2.80 m. The door is 90 cm on the north wall, opening inside. The window is 200 cm on the south wall. There is a 40 × 40 cm column in the southwest corner. Places: 3-seat sofa (220 cm), armchair (85 cm), TV unit (180 cm), dining table for 4 people (120 × 80 cm). At least 90 cm in the main passage, behind the table Leave 75 cm. Specify the size of each piece of furniture and the allowance around it; mark where it does not fit.”
The powerful prompt gives all constants (door opening, column, window), furniture dimensions and share rules; The output becomes verifiable.
The bridge between scale drawing and AI
The layout the AI produces is a “logic sketch”; what makes it applicable is scale drawing (transferring actual dimensions to paper or CAD environment with a certain ratio, for example 1/50). When you draw the plan to scale in a CAD/drawing program (such as AutoCAD, SketchUp, ArchiCAD), collisions and missing margins become immediately visible. Use AI for exploration and scenario generation, and scale drawing for precise verification. The two are not interchangeable; they complement each other.
Hint: Ask the AI for the placement in a "coordinate/list" format (each furniture: which wall is it against, how many cm from the wall). This format makes it easier to see errors when importing into a drawing program and produces fewer errors than free text.
Common mistakes
- Not giving constants. Requesting a layout without specifying the door opening direction, column, or installation point; making plans that cannot be implemented.
- Skipping usage allowance. Just looking at the furniture size and forgetting the opening/passage in front of it.
- Choosing efficiency over accessibility. Narrowing the passage for more tables/items and violating the regulations.
- Leaving the scale to AI. Relying on the visual scale of the AI and not verifying it with a scale drawing.
- Locking into a single location. Adopting the first logic and not exploring alternative scenarios.
In summary
Spatial planning is the language of measure, and the area where AI is weakest is measure. So use AI to generate layout logic, scenario and stake checklist; You put net room data, usage shares and accessibility rules into the prompt. Verify final layout with scale drawing. Provide constants (door, column, installation) from the beginning, take into account the usage share, do not prioritize efficiency over accessibility.
Application task
Take a room whose dimensions you know (note doors, windows, obstacles). Create 3 different layouts with the "layout logic generation" template. Then check your favorite with the "Measurement and numerator checklist" template. Verify the usage allowance for each piece of furniture by drawing it to scale on paper; Find and fix at least two share/collision errors.
checklist
- [ ] I wrote the exact room size, door opening, window and fixed obstacles into the prompt.
- [ ] I defined the function areas and the circulation line.
- [ ] I left at least 90 cm (70 cm in narrow places) at transitions.
- [ ] I checked the usage share (opening, pulling, transition) of each furniture.
- [ ] If accessibility is required, I provided a 90 cm transition and turning area.
- [ ] I verified the layout with a scale drawing.
- [ ] I generated and compared multiple layout scenarios.