ADU house Plans (450-800 sq. ft.) – Smart, Compact Living with Big Possibilities
Explore Affordable ADU Floor Plans Perfect for Backyard Units, Guest Suites, or Rentals
Find Your Dream house
Found 2,714 House Plans!
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Plan 16-1064 – Nevada Desert | Traditional Ranch Craftsman Duplex – 4-Bed, 4-Bath, 2,642 SF – House plan details
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Plan 10-1620 – California Coast | New American – 4-Bed, 3-Bath, 2,800 SF – House plan details
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Plan 11-1773 – Oregon Trail | Traditional Craftsman – 3-Bed, 2-Bath, 1,829 SF – House plan details
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Plan 15-1777 – Idaho Potato | Traditional Craftsman – 3-Bed, 4-Bath, 2,866 SF – House plan details
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Plan 17-1918 – Montana Big Sky | Traditional Colonial – 4-Bed, 5-Bath, 4,764 SF – House plan details
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Plan 15-1470 – Wyoming Frontier | Traditional Ranch – 3-Bed, 2-Bath, 1,750 SF – House plan details
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Plan 12-1100 – Dakota Badlands | Craftsman – 3-Bed, 2-Bath, 1,975 SF – House plan details
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Plan 13-1220 – Nebraska Prairie | Cape Cod – 3-Bed, 2-Bath, 1,420 SF – House plan details
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Plan 17-2146 – Kansas Wheat | Cottage – 4-Bed, 2.5-Bath, 2,500 SF – House plan details
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Plan 19-1300 – Missouri River | Modern Farmhouse – 3-Bed, 2.5-Bath, 2,610 SF – House plan details
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Plan 19-2004 – Iowa Cornfield | Classical Southern – 4-Bed, 4.5-Bath, 5,200 SF – House plan details
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Plan 20-1557 – Minnesota Lakes | Contemporary – 4-Bed, 3-Bath, 2,450 SF – House plan details
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Plan 9-1107 – Wisconsin Woods | Cape Cod – 3-Bed, 2.5-Bath, 2,100 SF – House plan details
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Plan 9-1359 – Illinois Prairie | Traditional Colonial – 3-Bed, 2-Bath, 1,379 SF – House plan details
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Plan 9-1874 – Indiana Crossroads | Modern Farmhouse – 3-Bed, 2-Bath, 1,348 SF – House plan details
at Is an ADU?
ADU stands for Accessory Dwelling Unit. It’s a smaller, self-contained residential structure that sits on the same lot as a primary home. Our ADU house plans are designed to meet a variety of uses, including:
- Backyard rental units
- Multigenerational housing
- Guest cottages or studios
- Home offices with living space
- Vacation or short-term rental units
Why Choose Our ADU House Plans?
- Every Plan Includes CAD + PDF Files – Customize and build with ease.
- Unlimited Build License – Use your ADU plan multiple times, anywhere you want.
- Structural Engineering Included – All plans are engineered and code-compliant.
- Free Foundation Changes – Choose slab, crawlspace, or basement at no extra charge.
- Plans Built After 2008 – Modern layouts designed to reflect today’s zoning and space efficiency.
Who Are ADU House Plans Perfect For?
ADU house plans are ideal for:
- Property owners in urban areas where land is limited
- Homeowners wanting a flexible guest suite or rental opportunity
- Families needing private space for elderly parents or grown children
- Contractors and developers building multiple ADUs across lots
Common Features in Our ADU Designs
Our ADU house plans may be small in square footage, but they’re big on livability. Typical features include:
- Open floor plans with combined living and dining areas
- Efficient kitchens with full appliance layouts
- 1–2 bedrooms with closet space
- Full bathrooms
- Separate entrances for privacy
- Loft or attic storage options
Build Anywhere With Confidence
Our ADU house plans are designed with flexibility and code compliance in mind. Whether you’re building in California, Texas, Oregon, or beyond—our plans are crafted with local building practices and energy efficiency in mind. And with full CAD files and engineering support, your builder can make adjustments for your exact site or city requirements.
Explore Related Small Living Designs
- 1 Bedroom House Plans
- Small Home Plans (Under 2000 Sq. Ft.)
- Modern House Plans
- Ranch Style Home Plans
- Detached Garage with Living Space
What’s Included in Every ADU House Plan Package
- CAD files for editing
- PDF files for printing
- Floor plans with dimensions
- Elevations and cross-sections
- Roof framing and structural layouts
- Electrical layout
- Foundation plan (customizable for free)
- Preview all plan sheets here
Frequently Paired Features
- Mudrooms or compact drop zones
- Covered front porches for charm and shade
- Dedicated workspace or study nooks
- Attached carports or rear garages
Learn More About ADU Development
Ready to Build Smarter?
Our ADU house plans offer unbeatable flexibility and affordability. Whether you’re adding an income-producing rental or designing a backyard guest home, we give you everything you need—engineered drawings, editable CAD files, and the freedom to build on your terms. No hidden fees, just great designs you can trust.
Frequently Asked Questions
What does ADU stand for?
ADU stands for Accessory Dwelling Unit—a smaller home that shares a lot with a main residence.
Can I build multiple ADUs from one plan?
Yes! Our ADU house plans come with an unlimited-build license.
Are ADU house plans legal in my area?
ADU legality depends on local zoning laws, but our plans can be modified to meet most codes.
Do your plans include engineering?
Yes! All ADU house plans include structural engineering.
Can I customize the foundation or roof of my ADU plan?
Absolutely. We offer free foundation changes and affordable layout edits.