Do you need planning permission for a new garage roof?

1Like for like: why the answer is usually no

Section 55 of the Town and Country Planning Act 1990 carves out repair and alteration jobs that leave the outside of a building looking much as it did, and these are not treated as development. That is the legal hook for an ordinary garage re-roof. Swapping a worn felt covering for new felt or EPDM on the same flat deck, or exchanging old corrugated sheets for new ones of a similar profile, fits that description in most cases.

The words that matter are materially and appearance. A new covering in a close colour, at the same height and the same pitch, looks identical from the road. A change from grey cement sheets to bright orange tiles might not.

Treat this as plain-English orientation rather than legal advice; a planning officer rules on what counts as a material change in any one case. If the garage stands in an area with extra controls, or attaches to a listed house, the starting point shifts. The later sections cover those cases, and the Adur & Worthing planning team can confirm in writing if you want certainty.

2Flat to pitched, or higher than before

The usual trigger for a planning question is a change of shape. Putting a pitched roof on a flat-topped garage alters the outline, and the ridge adds height. A garage that suddenly stands taller, or shows a fresh gable towards a neighbour, is much more likely to count as a material change than a straight re-cover.

The same goes for raising the walls, adding a room in the roof or fitting dormers and roof windows. Those are alterations, and the rules depend on how the building is used, where it sits in the plot and how near it is to a boundary. Rather than guess at limits, send the planning team a sketch of the existing and proposed heights.

If you are weighing a pitched option on cost and practicality too, the pitched garage roof page covers what it involves, and the main garage roof replacement service page sets it beside the flat alternatives. A flat roof renewed as a flat roof is a very different case.

3Listed buildings, conservation areas and Article 4 directions

Where you live can change the answer. A listed house can need consent for roof work that alters its special character, and that may reach outbuildings in the grounds. Materials matter: the Adur & Worthing guide counts a repair in different materials from the original as work needing consent.

Conservation areas do not ban re-roofing, but some carry Article 4 directions, which withdraw named permitted development rights so that permission is required for the matters listed. The councils hold directions covering Old Shoreham, Kingston Buci and several Worthing streets, and each removes something different. The Old Shoreham direction, for one, reaches roof coverings on dwellinghouses facing a highway.

Those rights are drafted for dwellinghouses, so whether any of them touches a detached garage is a point for the council. Ring the Adur & Worthing team with your address ahead of the job. Properties in the South Downs National Park answer to the SDNPA, so put the question to them.

4Building Regulations, asbestos and neighbours are separate checks

Planning is one permission among several. Building Regulations run their own tests, dealt with by your building control body, either the council or a registered approver. If the garage is becoming living space, or the new covering is much heavier than the old, speak to building control before the work, not after.

Asbestos is a safety question rather than a planning one, yet it shapes how the work is arranged. If the old sheets are asbestos cement, removal and waste come first; see our page on why an asbestos garage roof is fragile.

A garage shared with neighbours adds agreements to the list, as set out on the shared garage roof page. No one of these checks stands in for the others, and having planning clearance does not mean building control or the neighbours have agreed.

Condensation and warmth also come up while a roof is open, so it helps to read the notes on garage roof condensation before settling the specification.

5How to confirm your case before ordering work

Begin with the facts: what covers the roof now, what is going on in its place, the heights, and whether the garage is detached, attached or in a block. Photograph the existing roof from the front and sides. A like-for-like plan can usually be put in two sentences, and if you cannot say it that simply, ask the council.

Then check the setting. Is the house listed, in a conservation area or in the National Park? The council's planning pages show conservation areas and Article 4 directions. If any answer is yes, contact the planning team before booking.

Our survey leaves you with photographs of the existing covering, and the written quote names what comes off and what goes on. Those photographs help if anyone later asks how the garage used to look. Questions about warmth and lining come up here too, and the page on garage roof insulation covers them.