In England, a garden bar may fall under permitted development, but only when every outbuilding condition is met. The familiar 2.5 m rule applies to the whole building when it sits within 2 m of a boundary—not to every garden building.
The quick England checklist
The Planning Portal says an outbuilding must not sit forward of the principal elevation. It must be single storey, with eaves no higher than 2.5 m. The maximum overall height is 4 m for a dual-pitched roof or 3 m for another roof; if any part sits within 2 m of the boundary, the maximum overall height is 2.5 m.
Outbuildings and other additions must not cover more than half the land around the original house. "Original" means the house as first built, or as it stood on 1 July 1948 if it is older. Previous owners' extensions can therefore matter.
When the simple checklist is not enough
Stop and check with the local planning authority if the property is listed, on designated land, a flat or maisonette, or affected by an Article 4 direction or a planning condition that removes permitted-development rights. A garden bar used for something beyond a normal incidental domestic purpose can also raise a different question.
Planning and Building Regulations are separate
“No planning application” does not automatically mean “no Building Regulations”. In England, a detached building under 15 m² with no sleeping accommodation will not normally require Building Regulations approval. Between 15 m² and 30 m², exemption normally also depends on having no sleeping accommodation and either being at least 1 m from the boundary or being substantially non-combustible.
Electrical work has its own requirements. A permanent supply to an outbuilding needs to be designed, installed, inspected and certified appropriately.
A calm way to check before ordering
- Draw the proposed footprint and measure every boundary distance.
- Record the eaves and overall roof height from finished ground level.
- Check the planning history and property constraints with the local authority.
- Confirm the building's intended domestic use.
- Check Building Regulations and electrical requirements separately.
Check your own plot
Put your plot through the planning checker: it asks the same questions as this guide, one at a time, and draws your building against the height limit that applies.
Outside England
Scotland, Wales and Northern Ireland have their own rules. See planning in Scotland, Wales and Northern Ireland. Title deeds and leases can also restrict building; see covenants and leasehold.
Keep product drawings and any written response. A supplier calling a building “planning friendly” does not decide whether it is permitted development on your plot.
Sources
Primary guidance checked 10 November 2026.