Does replacing a rooflight or skylight need planning permission?

Rarely. A rooflight replaced in the same opening, at the same size, projecting no further than the one that came out, is very unlikely to need permission on an ordinary house. What changes the answer is a designated area, a listed building, a flat rather than a house, or a replacement that is larger or stands higher than the original.

The tests that apply

Projection, height and elevation, set out on do roof windows need planning permission.

This page covers how they apply when something is already there.

Why a like for like is straightforward

Because nothing about the appearance changes.

A unit going back into the same opening at the same size and the same projection presents the same face to the world as the one it replaced.

Where it stops being like for like

Size, projection or position. A larger opening, a unit standing higher above the roof plane, or a rooflight moved to a different part of the slope are all changes rather than replacements.

What each involves is on do I have to replace like for like.

A dome replaced with flat glass

Generally reduces the projection.

Swapping a raised dome for a flush glass unit lowers what stands above the roof, which is a change in the helpful direction as far as the tests go.

That is on can a dome rooflight be replaced with glass.

A flat unit replaced with a lantern

The change that does raise it. A lantern stands well above the roof plane where a flush unit did not, and that is assessed against the projection limits rather than treated as a swap.

The tests are on do roof lanterns need planning permission.

Conservation areas

Where a replacement can become a question.

Permitted development rights can be restricted, and a rooflight on a visible slope may be treated differently from one on a concealed rear roof.

The position is on do I need permission for a rooflight in a conservation area.

Replacing an old rooflight in a conservation area

Usually acceptable, and worth confirming.

Renewing an existing opening is a very different proposition from creating one, and authorities generally look at it that way.

That is on can I replace an old rooflight in a conservation area.

Where the officer will look

At how flush it sits. A recessed or conservation style replacement on a visible slope reads far more quietly than a surface mounted modern unit, and that is often what settles it.

What that involves is on how flush does a conservation rooflight sit.

Listed buildings

Consent is required regardless. Listed building consent applies to works affecting the character of a listed building, and replacing a rooflight on one engages it even where planning would not.

What that involves is on do I need listed building consent for a rooflight.

The National Park

Its own authority, over a large part of our area.

Permitted development rights are restricted within the South Downs National Park, so the answer for a village there differs from a suburb a few miles away.

Which authority applies is on who is the planning authority in the South Downs National Park.

Article 4 directions

Checked rather than assumed. An authority can remove permitted development rights over a defined area, and where it has, work that would ordinarily be permitted needs an application.

What one is is on what is Article 2(3) land.

Flats and maisonettes

Different rights entirely. Permitted development for roof alterations applies to houses, and a flat does not have the same rights, so a replacement can need an application.

The lease

The other permission people forget. A leaseholder generally needs the freeholder’s consent for alterations to the structure, and that is a separate question from planning.

A management company

Relevant on an estate or a block.

Some estates carry covenants requiring consent for external alterations, and those bind regardless of what the planning position is.

How to be certain

Ask the authority. A planning enquiry naming the property and describing the work gets an answer, and it is far cheaper than assuming and being wrong.

A lawful development certificate

Worth having where a sale is foreseeable.

An authority can confirm formally that work is permitted development, which is a document a buyer’s solicitor is content with.

Where consent was needed and not obtained

Dealt with rather than ignored. A retrospective application can be made, and the authority considers it on its merits like any other.

What follows is on what happens if I fit a rooflight without consent.

Building regulations are separate

And they usually do apply. A replacement rooflight has to meet a thermal standard whether or not planning is engaged, which catches people who checked only one of the two.

That is on does replacing a rooflight need building regulations.

Neighbours

Not a planning matter on a replacement, and worth a word anyway.

A rooflight going back into an existing opening changes nothing anybody looks at, but scaffold, access across a boundary and a day of noise are all easier when they have been mentioned in advance.

Where a party wall matters

Occasionally, on a terrace. Work that involves cutting into or building off a shared wall engages a separate procedure, and a rooflight close to a boundary in a terraced roof is worth checking rather than assuming.

What we check on a replacement

We check the designation before we quote a replacement on any older or village property, because on a designated slope the product decision follows the planning position rather than the other way round.

The whole picture is on the replacing a failed or misted rooflight page.