HousePlans★ USA ★

ADU & Small House Plans for Sale, Custom Drawn for Your Lot

Small homes work harder than big ones: every foot has to earn its place. A backyard ADU can house a parent, earn rent or become a home office.

We draw studios, one- and two-bedroom cottages, garage apartments and affordable starter homes to your city's size, height, setback and parking rules.

From $1,050 · free customization · delivery in as little as 24 hours

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ADU & Small House Plans

Why order ADU and small house plans from HousePlans USA

  • ADU rules handled

    Size, height, setback and parking limits are checked for your lot before concepts begin.

  • Live large in less

    Vaulted ceilings, lofts and built-in storage make small rooms feel open.

  • Build it again

    PDF unlimited build rights for $395 let you reuse the plan on more lots.

What's included

  • Studio, 1-bedroom and 2-bedroom layouts
  • Garage apartment with fire separation details
  • Utility routing from the main house
  • Aging-in-place details on request
  • Unlimited-build rights available for investors

Prices by size

Up to 1,000 sq ft$1,050
1,001 – 1,500 sq ft$1,295
1,501 – 2,000 sq ft$1,495
2,001 – 2,500 sq ft$1,695
2,501 – 3,000 sq ft$1,895
3,001 – 3,500 sq ft$2,195

See every add-on on our pricing page.

Where we draw ADU and small house plans

ADU & Small House Plans in California

ADU & Small House Plans in Florida

ADU & Small House Plans in Washington

ADU & Small House Plans in Oregon

ADU & Small House Plans in New York

ADU & Small House Plans in Texas

ADU & Small House Plans in North Carolina

ADU & Small House Plans in South Carolina

ADU & Small House Plans in Tennessee

ADU & Small House Plans in Colorado

How ordering works

  1. 1

    Get inspired

    Pick the exterior styles and interior looks you love, or paste links to plans you've seen online.

  2. 2

    Design & instruct

    Choose rooms, size, basement, garage and your state, and tell our designers exactly what you want.

  3. 3

    Compare 2+ concepts

    Two or more designers each sketch a concept. Pick your favorite designer to draw the full plans.

  4. 4

    Download & revise

    Plans arrive by email and in your dashboard by your deadline. Revisions are free for 30 days.

ADU & Small House Plans guides by state

ADU & Small House Plans: FAQ

Can I build an ADU in your state?+

In many cities, yes, but size, setback and parking rules vary. We check your lot's rules before we sketch.

Do you draw garage apartments?+

Yes. We draw one- and two-bedroom apartments over garages, including the required fire separation.

How much do ADU and small house plans cost in your state?+

Custom plans start at $1,050 for homes up to 1,000 sq ft and are priced by size. Most family homes come to $2,000–$3,000 all-in, with free customization and 30 days of revisions.

How fast can I get ADU and small house plans for your state?+

Standard delivery is 10 business days. Priority, Express, Rush (48 hours) and Super Rush (24 hours, up to 3,000 sq ft) are available at checkout.

Ready to design your home?

It takes about 10 minutes, and we save your answers as you go.

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