Do I Need Planning Permission for a Balcony? UK 2026
Most external balconies and raised roof terraces need full planning permission in 2026. The reason is privacy: any raised platform you can stand on and look out from is specifically excluded from Permitted Development because of the overlooking and loss-of-privacy it creates for neighbours. The main exception is a Juliet balcony — a guarded doorway opening with no walk-out platform — which usually does not. Here is exactly what needs consent, what does not, and how to give a balcony application its best chance of approval.
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What needs planning permission
You will almost always need full planning permission for a first-floor or upper-storey walk-out balcony, a roof terrace on a flat roof or above an extension, and any raised platform or decking over 300mm high with a usable standing area. All of these are excluded from Permitted Development specifically because they create overlooking into neighbouring gardens and windows.
What usually does not
A Juliet balcony — a set of doors at first floor with a guarding rail or glass balustrade across the opening but no platform to step out onto — generally does not need planning permission, because you cannot stand outside and overlook. Ground-level patios and low decking under 300mm are also normally fine. As always, conservation areas, listed buildings and flats (where PD rights often do not apply at all) are exceptions — check before you build.
How to check if your balcony needs permission
1. Identify the balcony type
Walk-out platform, roof terrace or Juliet? The presence of a usable standing area is the single biggest factor.
2. Check for overlooking
Would the balcony allow views into a neighbour's garden or windows? Overlooking is the issue planners weigh most heavily.
3. Check your designation
Conservation area, listed building, Article 4 zone or a flat? Any of these removes or restricts Permitted Development and makes an application more likely.
4. Apply with a strong privacy strategy
Obscured-glass screens, angled or solid balustrades and careful positioning to direct sightlines away from neighbours dramatically improve approval odds.
Costs and timescales
A householder planning application in England is £258 in 2026, plus £800–£2,000 for drawings and a design-and-access or privacy statement. Expect an 8-week statutory determination period, often 10–12 weeks in practice. Building Regulations approval for the structure and balustrade is separate and always required for a load-bearing balcony.
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