Room sizes for a three-bedroom single-storey house

Budget a three-bedroom brief: room areas, circulation and the facade length bedrooms need.

HousesBy the GoSpace team2 min readPublished 24 October 2026

A room list is the core of a house brief. This example turns one into a floor area and a footprint, with the assumptions shown. The minimum widths are the ones GoSpace's generator uses, not building-code requirements.

Three-bedroom plan with bedrooms and bathroom along a corridor and living, dining and kitchen at the front
Schematic arrangement of the example brief.

1. List the rooms with minimum areas

Example brief
RoomMinimum areaMinimum width
Living room24 m²3.3 m
Kitchen11 m²2.4 m
Dining10 m²2.7 m
Main bedroom14 m²2.7 m
Bedroom 211 m²2.7 m
Bedroom 310 m²2.7 m
Bathroom6 m²1.7 m
WC2.5 m²1.0 m

The rooms total 88.5 m².

2. Add circulation

Halls and corridors typically take 10–18% of a single-storey plan. Adding 15% gives 88.5 × 1.15 ≈ 102 m². A 14 × 11 m footprint (154 m²) holds that with about 52 m² to spare, which is shared out so most rooms end up larger than their minimum.

3. Check the bedroom facade

When bedrooms sit side by side along a corridor, their minimum widths add up: 3 × 2.7 m + 1.7 m for the bathroom = 9.8 m. A footprint narrower than that along the bedroom side cannot hold them in one row. Choose a wider footprint, an L-shape with a bedroom wing, or a deeper plan with a central hall.

4. Decide what should be next to what

  • Kitchen next to dining, so they can share a door.
  • Bathroom next to the main bedroom for an en-suite door.
  • A WC near the entrance for guests.

In GoSpace these are ranked preferences. Each generated option reports how many it met.

Generate the plan

Enter the brief in the house plan generator. The room step shows this area budget live, and each option lists rooms at size, daylight and circulation. For a corner courtyard, see L-shaped layouts.

Templates to try

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