Do you need planning permission for a new roof in Merthyr Tydfil?
Like-for-like re-roofs, conservation areas, listed buildings and building regulations.
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Last updated 27 October 2026
This is a general guide, not legal advice. Rules change, and every property is different. Before work starts, check with Merthyr Tydfil County Borough Council’s planning and building control teams.
Like-for-like re-roofing
Replacing your roof covering with something that looks broadly the same, such as slate for slate or tiles for tiles, without changing the shape or height of the roof, does not normally need planning permission on a house. It is usually “permitted development”.
When you may need planning permission
- Conservation areas. Merthyr Tydfil has several, including Thomastown and Pontmorlais. Changing materials or the look of a roof here may need permission, and some areas have Article 4 directions that remove permitted development rights.
- Listed buildings. Almost any roof work that affects the character of a listed building needs listed building consent. Cadw keeps the list for Wales.
- Changing the shape. Raising the roof, adding a front dormer or changing a hip to a gable usually needs permission.
- Flats and maisonettes. These don’t have the same permitted development rights as houses.
Building regulations
Building regulations are separate from planning. In Wales, replacing more than 25% of a roof normally counts as renovating a “thermal element”, so the insulation usually has to be upgraded to current standards. Changing to a heavier covering, such as concrete tiles to natural slate, may also need the roof structure checking. Ask your roofer whether they can self-certify the work through a competent person scheme, or whether you need to notify building control.
Bats and nesting birds
Bats are protected by law, and they often roost under slates and ridge tiles in older valley houses. If bats might be present, a bat survey may be needed before work starts, and a licence from Natural Resources Wales if they are. Nesting birds are also protected, so roof work may need to wait until nesting is over.
Party walls
On a terrace, work to a shared chimney stack or the party wall parapet may fall under the Party Wall etc. Act 1996. Talk to your neighbours early. It is usually straightforward and often saves money if you share scaffolding.
Ready to price the work? See what a new roof costs in Merthyr Tydfil or get a quote for a new roof.
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Questions people ask
Do I need building regulations approval for a new roof?
Usually, if you are replacing more than a quarter of the roof. Building regulations in Wales then normally require the roof insulation to be brought up to current standards, and changing to a heavier covering may need the structure checked. Many roofers can self-certify through a competent person scheme; otherwise, contact Merthyr Tydfil’s building control team.
Do I need permission to change from slate to tiles?
On an ordinary house outside a conservation area, usually not, as long as the new roof looks broadly similar. In a conservation area, on a listed building, or where an Article 4 direction applies, check with the council first.
Can I add a dormer without planning permission?
Some rear dormers on houses are allowed without planning permission, within size limits, but not on the front facing the road, not on flats, and not in conservation areas. Building regulations still apply. Check with the council before you commit.
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