Why is a roof terrace never permitted development?
Because every class of householder permitted development that could otherwise cover it contains the same exclusion: no verandas, no balconies and no raised platforms.
The Town and Country Planning (General Permitted Development) (England) Order 2015 grants householders their permitted development rights in Schedule 2, Part 1. The classes that matter for outdoor space above ground are Class A (extensions and alterations), Class B (additions to the roof) and Class E (outbuildings and structures in the garden). Each one carves out the same thing, word for word, and the Order defines "raised" so a terrace cannot slip through on height.
| Provision | What it says | Effect on a terrace or balcony |
|---|
| Class A, paragraph A.1(k)(i) | Not permitted if it includes a veranda, balcony or raised platform | A terrace on top of a rear extension is excluded |
| Class A, paragraph A.1(k)(iv) | Not permitted if it alters any part of the roof | Class A cannot be used to open up the main roof |
| Class B, paragraph B.1(e)(i) | Not permitted if it includes a veranda, balcony or raised platform | A dormer with a balcony or a terrace cut into the roof is excluded |
| Class E, paragraph E.1(h) | Not permitted if it includes a veranda, balcony or raised platform | A garden room with a roof deck is excluded |
| Part 1 interpretation, "raised" | A platform with a height greater than 0.3 metres | Anything higher than 300 mm counts |
| Article 2, "dwellinghouse" | Does not include a building containing one or more flats | Flats and maisonettes have no Part 1 rights |
Sources: GPDO 2015, Schedule 2, Part 1 and article 2, legislation.gov.uk, shown as up to date to 12 September 2026. Retrieved 12 September 2026.
The government's Permitted development rights for householders: Technical Guidance removes any doubt. It says a raised platform "will include roof terraces", and that verandas, balconies and raised platforms "are not permitted development and will require planning permission". For how permitted development works more generally, see our permitted development rules guide.
What does count as permitted development?
A Juliet balcony on a house, and garden decking no higher than 0.3 metres. Little else.
| Proposal on a house | Permitted development? | Why |
|---|
| Juliet balcony (rail across a door, no platform) | Normally yes | No platform, so no external access |
| Garden decking up to 0.3 m high | Yes, within Class E limits | Not "raised"; outbuildings and decking may cover up to 50% of the curtilage |
| Decking over 0.3 m high | No | A raised platform under Class E |
| Terrace on a flat-roofed rear extension | No | Class A.1(k)(i) |
| Balcony on a rear dormer | No | Class B.1(e)(i) |
| Terrace cut into a pitched main roof | No | Class B.1(e)(i); the roof volume must also stay within 40 m³ on a terraced house or 50 m³ otherwise |
| Any balcony or terrace on a flat | No | Flats are outside Part 1 |
Sources: MHCLG, Permitted development rights for householders: Technical Guidance (September 2019), pages on Classes A, B and E; GPDO 2015, Schedule 2, Part 1. Retrieved 12 September 2026.
"Normally" matters. On Article 4 direction land, in a conservation area or on a listed building, check with the council before fitting even a Juliet rail. If you want certainty on a house, a Lawful Development Certificate for proposed works costs £274, half the £548 householder application fee.
How do councils judge overlooking from a roof terrace?
There is no national distance rule. The officer asks what a person standing on the terrace could see, and whether it is a neighbour's habitable window or the private part of their garden.
A terrace is harder to approve than a window because people stand at its edge. A first-floor window gives a fixed, framed view. A terrace gives a moving view in every direction, plus noise, at a height the neighbour's fence was never designed to screen. London boroughs set out their tests in residential design guides and supplementary planning documents, and they vary, so read your own borough's guide before designing.
National rules show what the law treats as a privacy problem. Class B says side-facing windows in a permitted loft must be obscure-glazed and non-opening below 1.7 metres above floor level. Class AA, which allows extra storeys on some houses, makes the council assess "overlooking, privacy and the loss of light" at prior approval. A terrace that offers a clear view sideways at standing height is exactly what those rules are written to prevent.
- Set the usable area back from the edges. A terrace that stops short of the parapet cuts the downward view into neighbouring gardens.
- Screen the flanks, not the view. Obscure-glazed or solid screens on the sides facing neighbours, with the open side facing your own garden.
- Keep it small. A modest terrace off a bedroom reads as amenity space. A roof-wide deck reads as a place for gatherings.
- Watch the sightlines to rear windows. On a London terrace the neighbour's back addition is right beside yours; draw the view lines to its windows on a section.
- Consider the street. Front-facing balustrades on a period terrace can change a uniform roofline, which is where conservation officers object.
What do building regulations require?
Planning permission does not cover safety. Any roof people can walk on needs guarding under requirement K2 of the Building Regulations 2010, and the roof itself becomes a floor, with structure, drainage and fire considerations to match.
| Item | Figure | Source |
|---|
| Guarding height, external balconies and edges of roofs, single-family dwelling | 1,100 mm | Approved Document K, section 3 |
| Guarding height, internal stairs and landings in the same house | 900 mm | Approved Document K, section 3 |
| Householder planning fee, one house | £548 | MHCLG fees from 1 April 2026 |
| Householder applications granted, year to March 2026 | 90% of 151,900 applications | MHCLG planning statistics |
| Decided within 8 weeks or agreed time | 93% | MHCLG planning statistics |
Sources: Approved Document K, 2013 edition; MHCLG, Planning fees from 1 April 2026; MHCLG, Planning applications in England: January to March 2026. The grant rate covers all householder schemes, not terraces alone. Retrieved 12 September 2026.
The 1,100 mm guard is a floor, not a privacy screen. If the council asks for screening, that sits on top of the safety requirement, and the structure under it must be designed for the wind load a tall screen attracts.
What if you have already built one?
A terrace built without permission is a breach of planning control, and the council can act for ten years after it was substantially completed if that was on or after 25 April 2024. The route back is a retrospective application, usually with screens or a reduced area shown on the drawings. Our guides cover how to apply for retrospective planning and what to do if a planning enforcement notice arrives.
What goes in a roof terrace application?
A householder application for a terrace needs the standard location and block plans, existing and proposed floor plans and elevations, and a roof plan. The drawing that wins or loses it is usually a section through the terrace and the neighbouring property, showing floor level, balustrade and screen heights, and the line of sight to the nearest windows. A sheet of photographs taken from the roof, facing each neighbour, helps the officer judge the view without climbing up.
We prepare that set as part of our planning drawings service. Our planning-only drawing package is £840, and if a council refuses the scheme, our planning appeal service can take it further.
Written by Benyamen Shaukat, Technical Architect & Platform Founder. Fact-checked against GPDO 2015 Schedule 2 Part 1 (Classes A, B and E) and Approved Document K on 12 September 2026.
