ADU house Plans (450-800 sq. ft.) – Smart, Compact Living with Big Possibilities

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

• Need Custom Modifications?
• Learn About Unlimited Builds
• Accessory Dwellings Resource (Follow)

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.

Explore ADU House Plans Now →