Glossary
Wrap-around extensions on a London side and rear return
A combined rear + side-return extension forming an L-shape.
A combined rear + side-return extension forming an L-shape.
A wraparound extension combines a side return infill with a rear extension in a single L-shaped footprint. It is the most transformative ground-floor project available to a Victorian or Edwardian terrace, and because the combined footprint usually exceeds the permitted development depth, it normally needs a full planning application.
No. Class A treats the side and rear elements as one enlargement, and the combined width exceeds half the original house on any normal London plot. Every wrap-around is a full householder application at £548. London councils still approved 83.0% of the 77,680 householder applications they decided, so the application route is not the obstacle it sounds like.
| Test | Wrap-around | Class A limit |
|---|---|---|
| Treated as | one enlargement | — |
| Width | side plus rear | half the original house |
| Rear depth, terrace or semi | varies | 3m, 6m under prior approval |
| Height | usually 4m or less | 4m |
| Eaves within 2m of a boundary | usually breached | 3m |
| Permitted development available | no | — |
| Application fee | £548 | statutory, England 2026 |
Source: the Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2, Part 1, Class A, as amended, read at 1 September 2026; fees from the Fees for Applications Regulations 2012 as amended, 2026 rates. London councils approved 83.0% of the 77,680 householder applications they decided in the twelve quarters to March 2026 (MHCLG PS1 and PS2), so an application is not a barrier — it is simply the route.
The depth limit is measured from the original rear wall — the back of the main house, not the back of the Victorian addition. A wraparound that runs the full length of the back addition and then extends beyond it is almost always more than 3 m deep, so Class A does not cover it.
The larger home extension prior approval route allows 6 m, but it applies only to the rear projection and not to the side element, and it is unavailable in conservation areas.
A single wide room across the full width of the plot, usually 5 to 6 m deep, replacing the original kitchen, the side passage and part of the garden. Typical gains are 20 to 30 m². Rooflights over the return and glazing to the rear do the lighting; a structural goalpost frame usually replaces both the back addition flank wall and the rear wall.
Daylight to the middle of the plan, which is why a rooflight strip over the return matters more than the rear glazing; the 45-degree rule from the neighbour's nearest habitable window, which caps the depth adjacent to the boundary; drainage, because an existing manhole often sits exactly where the extension goes; and party wall notices on both boundaries.
Wraparound extension in a Hackney context: London Borough of Hackney (Hackney Council) runs 29 conservation areas including the De Beauvoir Town Conservation Area and the Stoke Newington Conservation Area, and an Article 4 direction is in force there, so permitted development cannot be assumed. That decides how wraparound extension is handled: £548 and 8 weeks for a Hackney householder application, or £274 for the Lawful Development Certificate that records wraparound extension as lawful. The law behind wraparound extension sits in the Town and Country Planning Act 1990, the GPDO 2015 and the Building Regulations 2010.
| Typical area gained | 20–30 m² |
|---|---|
| Typical depth | 5–6 m from the original rear wall |
| Depth measured from | Original rear wall, not the back addition |
| Usual route | Full householder application, £548 |
| Structural solution | Goalpost frame to rear and flank |
| Our package from |
Rarely. The combined footprint almost always exceeds the depth limit.
Coverage of all extensions and outbuildings must stay under 50% of the curtilage excluding the original house.
Building over or near a public sewer needs a build-over agreement from the water authority.
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