This guide shows how to use the Snaptrude Agent on a multifamily residential project. The agent can analyze the site, build a buildable envelope from setbacks, create massing options, plan the unit mix, draw unit plans, stack them into floors, add doors, windows, stairs and furniture, and lay out parking and the site plan. Use it for feasibility studies and early design on apartment buildings, podium projects and townhouse developments.
Before you start
Open the AI chat with the Agent button at the top of the far-left rail. Type in the Ask anything box. Use Attach files (image, PDF, or text) to give the agent a brief, an RFP or a reference image, and Redline this view to mark up what you want changed.
The agent works in Design, BIM and Present Mode, and can read your Program Mode sheets.
Steps that create BIM objects (walls, doors, windows, stairs, families) need BIM Mode, which is included in the Pro, Organization and Enterprise plans.
Every prompt uses AI credits. For long, multi-step jobs, open Boosts under the chat box: Fast mode runs up to 5x faster and uses 2x credits; Cloud processing keeps tasks running in the background.
1. Analyze the site and zoning
Try: "Import the site at [address] with terrain and neighborhood buildings, and run a site analysis. Note the frontage, access, sun and views for a residential building."
Try: "Create a buildable envelope with 6 m front, 3 m side and 6 m rear setbacks and a 25 m height limit."
2. Set the unit mix and program
Try: "Create a program in Program Mode for about 120 units: 20% studios at 40 m2, 45% one-bedrooms at 55 m2, 30% two-bedrooms at 80 m2 and 5% three-bedrooms at 105 m2, plus a lobby, amenity room, bike storage and refuse room."
3. Create massing options
Try: "Mass a 7-story building inside the envelope: a 2-story podium with lobby and amenities at the street, and a double-loaded residential bar above. Keep the floor-to-floor at 3.1 m."
Try: "Make two alternatives as design proposals: a U-shape around a courtyard and two separate bars. Show me unit counts and gross area for each."
Tip: Compare options in the Areas tab, and use the Proposal dropdown in the left panel to switch between them.
4. Draw unit plans
Try: "Design a typical one-bedroom unit, 6.5 m wide: open kitchen and living area at the window, bedroom with a wardrobe, one bathroom, and a laundry closet by the entry."
Try: "Now design the studio, two-bedroom and three-bedroom units on the same 6.5 m module so they stack."
Trace existing drawings
If you're working from existing plans or a site survey, bring them in first: click the project name, choose Import, and pick CAD Files (.dwg), PDF or Images. Then ask the agent to trace them.
Try: "Trace the imported CAD file of the existing site survey and create the site boundary and existing buildings."
5. Lay out and stack the floors
Try: "Lay out the typical residential floor with a 1.6 m central corridor, two stair cores and lifts, and the units arranged to hit the unit mix. Then copy the typical floor to levels 3 to 7."
6. Add doors, windows, stairs and furniture
Try: "Convert the residential floors to BIM. Add entry doors to every unit, interior doors, floor-to-ceiling windows in living rooms, standard windows in bedrooms and balconies on the south facade."
Try: "Furnish the typical units: bed and wardrobe in each bedroom, sofa and dining table in the living area, and kitchen and bathroom fixtures."
7. Plan parking and the site
Try: "Create the site plan with the building entry on the street, a driveway to a surface parking lot for 90 cars at the rear, 4 accessible spaces near the entrance, landscaping and a play area."
8. Present the scheme
Try: "Place the ground floor plan, a typical floor plan, the unit plans and a 3D view on sheets, and add a unit mix table."
Use Auto Diagram for program and site diagrams, click an image on a sheet to open AI Inspirations for renders, and export from Present Mode with Export.
Note: The agent gives you a strong starting point, not a finished, code-checked design. Review every result: check dimensions, clearances, egress and local code requirements with your own professional judgment before you rely on it.
Tips for working with the agent
Work in steps. Ask for one stage at a time (site, program, massing, plans) and review before moving on. It's easier to steer than one giant prompt.
Be specific about numbers: areas, counts, floor-to-floor heights, setbacks and grid sizes.
Say what must stay the same: "keep the core and the structural grid, only change the unit mix".
Use Redline this view to sketch over the model when describing a change is harder than drawing it.
Start a fresh conversation with + (Start a new session) when you switch to a different design question. The agent's Memory (in the ... menu) keeps preferences you want it to reuse.
Use Design Proposals to keep alternative schemes side by side instead of overwriting one option with the next.
For feasibility studies, ask the agent for unit counts, net-to-gross efficiency and parking ratio after every major change, so you can see how each move affects the numbers.
Related articles
Design with the Snaptrude Agent
Setbacks and the Buildable Envelope
Import a Site: Parcels, Terrain and Context
Design Proposals: Compare Options in One Project
Buildings and Stories
The Area Panel: Net, Gross, FAR and Targets
