I typed "three-bedroom, two-bathroom, 1,800 square feet, modern farmhouse" into five different AI floor plan generators. Every single one returned a layout within a minute. Three of them put a bathroom without a vent fan. Two had bedrooms with no egress windows. One generated a two-story home and forgot the staircase entirely.
This is where consumer AI floor plan tools live in 2026: fast, confident, and structurally illiterate.
The Five Tools
| Tool | Price | Speed | Code Compliance |
|---|---|---|---|
| Maket.ai | $29/mo | ~20 sec | Partial — room sizes reasonable, no MEP |
| Planner 5D AI | Free–$25/mo | ~45 sec | None — decorative only |
| Homestyler | Free–$5/mo | ~30 sec | None — no structural awareness |
| Getfloorplan | From $5/plan | ~60 sec (human-assisted) | Moderate — trained on real listings |
| RoomGPT / AI Room Planner | Free | ~15 sec | None — image-to-image only |
Maket was the only one that consistently produced dimensionally plausible layouts. It understands that a primary bedroom should be at least 120 square feet and that hallways need to be 36 inches wide. It does not understand that IRC Section R311.7 requires a stairway to the second floor, or that IRC R303.1 requires natural light in habitable rooms.
What They Get Right
Spatial adjacency. Every tool correctly places kitchens near dining rooms, clusters bathrooms to share plumbing walls, and orients living spaces toward the front of the house. This isn't trivial — it's the result of training on millions of real floor plans from MLS listings and architectural databases. The room-to-room flow feels intuitive because it is intuitive. It's what Americans expect a house to look like.
They're also remarkably good at the napkin-sketch phase. If you're a homeowner trying to communicate to an architect "roughly like this, three bedrooms, open kitchen," these tools produce a starting point in seconds that used to require a $500 schematic design consultation.
What They Miss
Everything that makes a floor plan buildable.
IRC egress requirements: every sleeping room needs at least one window with a minimum 5.7 square feet of openable area and a sill height no more than 44 inches above the floor. None of the five tools check this. Planner 5D generated a basement bedroom with one tiny awning window that wouldn't pass inspection in any US jurisdiction.
Structural load paths. A second-floor bathroom positioned directly over a first-floor living room with a 16-foot clear span needs an engineered beam. The AI places rooms where they look balanced on screen, not where the loads can be carried down to the foundation. An architect told me she's seen three clients arrive with AI-generated plans that would require steel moment frames to build — adding $15,000–$40,000 to the structural package.
Mechanical systems. None of the consumer tools account for duct routing, plumbing stack locations, or electrical panel access. A floor plan that looks elegant on screen can become unbuildable when you try to run HVAC through it.
The $500 vs. $5,000 Decision
A licensed residential architect charges $5,000–$15,000 for a full set of construction documents on a custom home. That includes structural coordination, code review, MEP integration, and a professional stamp that lets you pull a building permit.
An AI floor plan costs $5–$30 and gives you something that looks like a floor plan but isn't one. It's a mood board in the shape of a blueprint.
The honest middle ground: use the AI tool to explore layouts for $30, then hand your three favorite options to an architect. You've just compressed the schematic design phase from four weeks to four days. The architect isn't starting from a blank page. You aren't paying $5,000 for the exploration you could have done yourself.
That's real value. Just don't confuse the sketch with the building.
Where This Goes
Maket raised $6.2 million in 2024 and is adding IRC code checking to its pipeline. Autodesk's Forma platform (successor to Spacemaker) can evaluate solar exposure, wind comfort, and operational energy during massing studies — but it's aimed at multi-family and commercial, not single-family residential. TestFit, which raised $20 million, automates site feasibility for apartment buildings but doesn't touch custom homes.
The gap is clear: nobody has built the tool that generates a code-compliant, structurally sound, permit-ready residential floor plan from a text prompt. When someone does, architects won't disappear — but the $5,000 schematic design phase probably will.
Until then, the AI draws the dream. The architect keeps the roof from caving in.