How to Write a Prompt for an Event Floor Plan
The room, headcount, format, constraints and priorities an AI needs to give you a usable layout.
This guide shows how to write an event floor plan prompt that an AI can turn into a usable layout. It explains the five parts every brief needs and gives you a template to copy, a worked example and a scale check. It ends with a simple routine for changing one thing at a time.
A one-sentence prompt makes an AI guess the room, the format, the exits and what matters most. Every guess is a default, and defaults are where errors hide. A usable event floor plan prompt has five parts. They are the room as a to-scale file, the headcount at peak, the format of each zone, the constraints that cannot move, and the priorities in ranked order.
Why a one-sentence prompt fails
Take a typical prompt, "Layout for a 300-person conference in a ballroom." The tool must guess the room, with its size, shape, columns, doors and exits. It must guess the format, such as theater, classroom or cabaret, and what else shares the floor. It must guess the rules for aisle widths, exit clearances and accessible routes. And it must guess the priorities, meaning what to give up when it does not all fit.
Each guess becomes a default, and defaults are where AI floor plan generation goes wrong. The prompt guides from Anthropic, OpenAI and Google agree on the basics. Be specific, give context and say what output you want. A layout needs all three. Monet vs Gemini on event floor plans shows what a general assistant does with a full brief.
The five parts of an event floor plan prompt
1. The room
Supply the room as a file, not a description. Use the venue's PDF or DWG, with DWG units, a scale bar or one known dimension. If you already have the venue's file, use it, because there is no need to redraw. Where to get a venue floor plan covers finding one.
Name the fixed elements. These are columns, doors and exits with clear widths, rigging points, floor boxes, ceiling heights, and floor loading if known. A photo or screenshot of a plan is not a to-scale file.
Run a scale check before you prompt.
- Pick three distances you know, such as the room's length, one exit's clear width and the gap between two columns.
- Measure each one on the file.
- If any of them differs from the known figure, fix the scale first.
2. The headcount
Give peak occupancy, not registrations. That means the people in each zone at the busiest moment, plus staff and crew on the floor. Take a launch with 350 at a standing reception and 250 seated for a keynote. That is two layouts in one room, and the prompt must state both.
3. The format
Go zone by zone, in standard terms with sizes. The usual terms are theater, classroom, cabaret, banquet, reception, exhibition, stage, catering, registration, cloakroom, back of house and storage. For exhibition zones, give booth sizes and counts. "A seminar area of about 12 x 10 m with 100 seats in rows facing a 6 x 3 m stage" leaves nothing to guess.
4. The constraints
Write the rules that cannot move as rules with numbers. Take exit clearances and aisle widths from the local code and the venue's own conditions. Add accessible routes, wheelchair spaces and sightlines to the stage. State that nothing temporary may stand in the main walkway. Give the load-in route and the noise limits between zones.
In the US the reference is NFPA 101, the Life Safety Code. Elsewhere, look up the local equivalent. Never let the tool's defaults stand in for the code. What fire marshals look for in an event layout lists the usual checks.
5. The priorities
Rank them. For example, put exits and aisles first, sightlines second, sponsor visibility third and catering flow fourth. A ranking tells the tool what to give up when everything cannot fit. That is the decision a designer would otherwise make in silence.
The event floor plan prompt template
Copy this and fill in the brackets.
``` ROOM Venue file attached (PDF or DWG). Units or scale [millimeters, a drawing scale or one known dimension]. Fixed elements [columns, doors, exits with clear widths, rigging points, floor boxes, ceiling height, floor loading].
HEADCOUNT Peak on the floor [number]. Per zone at the busiest moment [zone and number]. Staff and crew [number].
FORMAT For every zone [type, size and count].
CONSTRAINTS Main aisles [m]. Cross aisles [m]. Every exit and a [m] path to it clear. Nothing within [m] of a column. Accessible route [details]. Load-in route [details]. Code [local code and venue conditions].
PRIORITIES First [ ], second [ ], third [ ], fourth [ ].
OUTPUT A to-scale layout on the attached file, and a list of every assumption you made. ```
Here is a worked example for a 60 x 40 m reference hall, set up for a trade show with a seminar.
``` ROOM DWG attached, in millimeters, plus a vector PDF at 1:200 with a scale bar. Single-level hall, 60 x 40 m, 6 m clear height. Four 2.4 m exit doors, two on each long side. A 4 m loading door on the east wall. Main entrance on the west wall. Two 0.6 m square columns on the center line, 20 m and 40 m from the west wall.
HEADCOUNT Peak of 600 people on the floor.
FORMAT 30 booths of 3 x 3 m and four 6 x 6 m island stands. A seminar area of about 12 x 10 m with 100 seats in rows facing a 6 x 3 m stage. Registration at the main entrance with two queues. A catering area of about 150 m2 with 20 high tables.
CONSTRAINTS Main aisles 3 m wide, cross aisles 2 m. Every exit, and a 2 m path to it, clear. Nothing within 1 m of a column.
PRIORITIES First exits and aisles, second seminar sightlines, third island-stand visibility, fourth catering flow.
OUTPUT A to-scale layout on the attached file, and a list of every assumption you made. ```
The numbers in the example show the format. Take real values from your local code and the venue's conditions.
Iterate one change at a time
- Change one thing per prompt, such as "Move the seminar to the north end; keep everything else."
- Ask the tool to list what it assumed. Correct any wrong assumption in the next prompt.
- Compare the versions side by side.
- Check every version against the venue drawing and the local code, not the tool's defaults.
Doing it in Monet
Monet takes this brief with a plan from its library or your own PDF or DWG upload. It returns a to-scale layout in minutes. After every change, its checks run again. They cover exit clearance, temporary structures in the main walkway, crowd flow, noise on nearby booths, a carbon estimate for each layout and spatial occupancy. Renders and drawings follow from the same layout.
Do not ask it for renders from a viewpoint you pick, custom objects such as signage or ramps, or seat assignment. You do not need CAD skills to use it.
Brief like a designer
A layout tool is only as good as the brief it gets. Give it the room as a file and rank the priorities. Then it stops guessing and starts planning.
Frequently asked questions
Can I paste a venue PDF into ChatGPT and get a layout?
You can attach it and ask, but check whether the result is to scale before you use it. Measure three known distances on whatever comes back. Then check every exit clearance and aisle width yourself before you trust any count or position.
Why does my AI layout ignore the exits?
Usually it is because the prompt never stated them as rules. Name every exit with its clear width. Write the clearance you need as a number. Then rank exits and aisles first among the priorities, so the tool treats them as fixed.
How long should an AI floor plan prompt be?
Make it as long as the five parts need, which is usually a few lines per part. Length matters less than numbers with units, a to-scale file and a ranked list of priorities. One precise sentence per constraint beats a page of adjectives.
What aisle widths should I put in an event layout prompt?
Take them from the local code and the venue's own conditions, not from a tool or a template. In the US, NFPA 101 is the usual reference. Elsewhere the local equivalent applies. The authority having jurisdiction, meaning the official who approves the event, has the final word.
When your brief is ready, try it in Monet with the venue file you already have, and measure the layout it returns.