The short answer
For most homes, fitting a skylight or roof window is permitted development and needs no planning permission, provided it sits no more than 150mm proud of the roof slope, does not rise above the highest part of the roof (the ridge), and — for any side-facing window — is obscure-glazed and non-opening below 1.7m from the floor. The important exceptions are listed buildings, where listed building consent is required for any rooflight, and conservation areas, national parks and AONBs (or homes under an Article 4 direction), where you should check with your local planning authority first. Most rooflights also need to meet building regulations for things like glazing and safety, separate from planning.
Two questions come up on every skylight job: do I need planning permission, and do building regulations apply? For most homes the answers are 'no permission' and 'yes, building regs'. The exceptions below are the ones that matter.
The rules in brief
- Standard house, within limitsno planning permission
- Proud of roof slopemust be under 150mm
- Above the ridgenot allowed under PD
- Listed buildinglisted building consent needed
- Conservation / Article 4check the local authority first
When a skylight is permitted development
Adding a rooflight to a house is normally permitted development, so no planning application is needed, as long as it stays within the limits. The window must not protrude more than 150mm above the plane of the roof slope, must not be higher than the highest part of the roof, and any side-facing window must be obscure-glazed and either fixed shut or only openable 1.7m or more above the internal floor. Stay inside those and a standard house typically needs no planning permission for a skylight.
When permission or consent applies
The permitted-development rights fall away in a few situations. A listed building needs listed building consent for any rooflight, regardless of size or visibility — unauthorised work to a listed building is a criminal offence, so consent must come first. In a conservation area, national park or AONB, or where an Article 4 direction applies, permitted development may be restricted and you should check with your local planning authority before starting. Separately, most rooflights must meet building regulations covering glazing, safety and (where relevant) ventilation — that is a different approval from planning and usually still applies even when no planning permission is needed.
| Situation | Permission needed? |
|---|---|
| Standard house, within PD limits | No planning permission |
| Listed building | Yes — listed building consent |
| Conservation area / national park / AONB | Check local authority first |
| Under an Article 4 direction | Check local authority first |
| Building regulations | Usually apply separately |
General guidance — confirm your own case with your local planning authority. Source: Planning Portal.
Want a quote with the rules checked?
We'll match you with a vetted roof-window installer who confirms the unit sits within permitted-development limits and flags any conservation-area or listed-building check for your property.
Frequently asked questions
Do you need planning permission for a skylight?
For most homes, no — a skylight is permitted development as long as it sits no more than 150mm proud of the roof slope, does not rise above the ridge, and any side-facing window is obscure-glazed and non-opening below 1.7m. Listed buildings and conservation areas are the main exceptions.
Do skylights need planning permission in a conservation area?
They may. In a conservation area, national park or AONB, or where an Article 4 direction applies, permitted-development rights can be restricted, so you should check with your local planning authority before installing a rooflight.
Do I need permission for a skylight in a listed building?
Yes. Any roof alteration to a listed building, including a rooflight, requires listed building consent regardless of size or visibility, and must be obtained before work begins.
Sources & further reading
- Planning Portal — roof: planning permission
- Roof Windows 4 You — planning permission for skylights & roof windows
Figures on this page are typical UK ranges drawn from published sources and depend on your specific property. They are guidance, not a quotation.