ADU and guest house plans are designed for smaller independent living spaces. They may be used as backyard cottages, in-law suites, rental units, guest quarters, pool houses, or compact homes for flexible property use.
Accessory dwelling units can vary widely depending on local zoning, lot size, utility access, parking requirements, and building code rules. Some are detached backyard structures, some are garage conversions, and others are built above or beside a garage.
Common ADU and Guest House Features
Popular ADU layouts often include one bedroom or studio living, a compact kitchen, bathroom, laundry area, storage, private entry, covered porch, and efficient mechanical space. Many homeowners look for simple layouts that keep the footprint small while still feeling comfortable and functional.
- Backyard cottage ideas
- In-law suite and guest-house layouts
- Compact kitchen and bath planning
- Detached or garage-connected options
Planning an accessory building?
Use buildingplans.com to browse plan categories and start organizing your ideas. The free Ai Plan Wizard currently begins with garage plan requests and will support more building types as the platform expands.