Small House Plans Under 1,000 Sq Ft: Layouts That Fit

Under 1,000 sq ft you can build a real two-bedroom house: 800 ft² holds two bedrooms, a full bath, a laundry and an open kitchen, dining and living room. The building code sets no minimum size for a house, only minimums for each room, so the limits are mostly zoning and how well the plan uses its area. Here is a measured 800 ft² layout and a guide to what fits at each size.

What fits at each size

The jump from one bedroom to two is where most small plans go wrong. A second bedroom needs a closet, an egress window and a door off a hall or the living space, and the hall to reach it costs 40 to 60 ft² before the room itself. To size the house to a household, see how many square feet per person.

An 800 sq ft two-bedroom, measured

FloorGen's 800 sq ft 2-bed ADU (walked through in 800 sq ft ADU floor plans) is a 40 × 20 ft rectangle to the outside of its walls, designed as a backyard unit but just as usable as a small house. The bedrooms are at one end, a short hall serves the bath and a laundry alcove, and the kitchen, dining and living room run together across the other end, with a window at each end of the living room.

About 100 ft² of the 800 goes to walls, and less than 50 ft² to hallway. The kitchen, dining and living spaces add up to about 377 ft², more than half the net area, which is what makes the house feel larger than its size: the kitchen, dining and living spaces flow together through wide openings across about 24 ft of the building's 40 ft length.

The real minimums: rooms, not houses

The International Residential Code, which most US jurisdictions adopt, has no minimum dwelling size. It sets minimums room by room:

• Habitable rooms (except kitchens): at least 70 ft² and 7 ft in any horizontal direction (2021 IRC R304; 2024 IRC R312). Until the 2015 edition the IRC also required one room of at least 120 ft²; that rule is gone, though some local codes kept it.
• Ceiling height: 7 ft for habitable rooms and halls, 6 ft 8 in for bathrooms and laundry rooms (2021 IRC R305).
• Sleeping rooms need an emergency escape opening and smoke alarms; see what makes a room a bedroom.
• Tiny houses of 400 ft² or less, excluding lofts, can use the reduced rules of the tiny-house appendix (Appendix Q in the 2018 IRC, renamed Appendix AQ in 2021) where a jurisdiction has adopted it: 6 ft 8 in ceilings in habitable space and halls, and rules for sleeping lofts and their stairs or ladders (see tiny house floor plans).

Layout tips for small plans

1. One wet wall. Back the kitchen sink, the bath and the laundry onto the same few walls. Short drain runs save money, especially on a slab.
2. No corridor longer than it must be. A 4 ft hall that serves three doors is fine; a hall that serves one door is a room you are not using.
3. Light from two sides in the main room. The template's living room has windows at both ends, which matters more in a small house than one big window.
4. Pocket and sliding doors where swings would collide. The template's bath door is a 30 in swing door off the hall, because that short stretch of wall is too narrow for a pocket door.
5. Storage outside the floor plan: a shed, an attic hatch or a covered porch closet keeps it out of the 800 ft².
6. Measure the furniture. A queen bed (60 × 80 in) with walkways on both sides needs a room about 10 × 11 ft; place real furniture before committing to a room size. Standard room sizes gives the usual ranges.

FloorGen's IRC profile checks room areas and widths, ceiling heights, an escape window in every bedroom, door swings and walkways. It does not check zoning or the tiny-house appendix, so treat it as a layout tool and confirm the rest with your building and planning departments.