ADU floor plans with a build cost
Pick a size. Get a drawing, room sizes and a cost range. Check it fits your space, then edit it.
Rooms
| Entry | 4.5' × 8.0' | 36 sqft |
| Great Room (Living + Kitchen + Dining) | 17.5' × 22.0' | 385 sqft |
| Primary Bedroom | 10.0' × 14.0' | 140 sqft |
| Bathroom | 5.5' × 8.0' | 44 sqft |
Build cost
Computing…
Will it fit?
Enter the open space you have for the ADU. The plan is tested in four directions.
Look up your lot size
City records for New York City, Chicago, Philadelphia, Seattle, Boston, San Francisco and Turkey.
ADU sizes compared
| Plan | Outline | Area | South | Midwest | Northeast | West |
|---|---|---|---|---|---|---|
| Studio | 22.5' × 18' | 405 sqft | $44,145 – $71,280 | $40,500 – $66,825 | $62,775 – $89,100 | $89,100 – $124,740 |
| 1 bedroom | 27.5' × 22' | 605 sqft | $65,945 – $106,480 | $60,500 – $99,825 | $93,775 – $133,100 | $133,100 – $186,340 |
| 2 bedroom | 28.5' × 28' | 798 sqft | $86,982 – $140,448 | $79,800 – $131,670 | $123,690 – $175,560 | $175,560 – $245,784 |
| 2 bedroom, 2 bath | 31' × 32.5' | 1,007.4 sqft | $109,807 – $177,302 | $100,740 – $166,221 | $156,147 – $221,628 | $221,628 – $310,279 |
| Garage conversion | 23.5' × 18.5' | 434.8 sqft | $47,393 – $76,525 | $43,480 – $71,742 | $67,394 – $95,656 | $95,656 – $133,918 |
Standard finish. Construction only: land, site work beyond the basics, and financing are not included. Every row, including the garage conversion, is priced as a new build of that size. See the cost calculator for the full breakdown.
Questions
Where do the drawings come from?
Each plan is computed by HomePlan's layout engine when you pick a size. Rooms, walls, doors and windows are real geometry with dimensions in feet, so you can edit the plan afterwards.
How is the build cost worked out?
The plan's square footage is multiplied by a cost per square foot range for your region and finish level. The split by trade follows NAHB's 2024 Cost of Constructing a Home survey. It is a planning estimate, not a contractor bid.
What does the fit check do?
You enter the width and depth of the open space you have and the gap you want to keep from its edges. The plan's outline is tested in four directions and you are told whether it fits.
Can I change the plan?
Yes. Open in Studio loads the same plan in the editor, where you can move and resize rooms, add furniture, and export a PNG for free.
Does this tell me what I am allowed to build?
No. Size limits, setbacks and approvals depend on your city. Use these plans to compare sizes and budgets, then confirm the rules with your local planning office.