Dormer roofs across Cheshire

Guide price

£1,350–£2,500

Survey

Free for new and replacement roofs

Quote

Fixed, in writing

Coverage

England, Wales, Scotland, NI

How much does a new dormer roof cost in Cheshire?

Guide prices including VAT at North West rates. The fixed price comes after a free survey for new and replacement roofs.

Which flat roofs are common in Cheshire?

Flat roofs in Cheshire sit on low-rise post-war blocks of flats, newer estates where the first extension roofs are now being replaced and shops with flat-roofed rear stores below flats. The North West is one of England's wetter regions, averaging roughly 1,290 mm of rain a year, so falls, outlets and well-detailed upstands matter more than the membrane colour. Approximate 1991–2020 regional averages based on Met Office data.

Building regulations in England

Replacing more than half of a roof over a heated room usually counts as renovating a thermal element, so it is insulated to current standards and notified to building control. Renovated roofs over heated rooms are insulated to around 0.16 W/m²K where that's feasible, and new extension roofs are built to 0.15 W/m²K. In Cheshire the application goes to Warrington Borough Council, Cheshire West and Chester Council, Cheshire East Council and 1 other council. More on the rules.

Do I need building regulations approval for a dormer roof?

Usually, yes, if you are replacing most of the roof. A dormer roof sits over a heated room, so it counts as a thermal element, and renovating more than half of it normally means upgrading the insulation where feasible.

In England the renovation target is 0.16 W/m²K for homes, approved through building control or a competent person scheme. Wales usually needs approval for most re-roofing work. Scotland works through the council's building standards and, where required, a building warrant. Northern Ireland asks you to contact district council building control before starting.

Insulating above the deck raises the roof slightly. On a dormer, that extra height has to fit under the main roof tiles at the back edge, so the build-up is planned at survey. Re-covering a dormer that looks the same afterwards does not usually need planning permission, but a listed building or conservation area may bring extra controls. More on our building regulations page.

Why is scaffold and tile detailing so important on a dormer?

Because a dormer roof is high, small and surrounded by a pitched tiled roof, most failures happen at the edges rather than in the middle. Safe access is what allows those edges to be done properly.

Ladders alone do not give a safe working platform at that height, and every roof is treated as fragile until a competent person confirms otherwise. Scaffold with edge protection lets the team work along the front and sides of the dormer, and reach the junction with the main roof.

The back of the dormer is where most leaks start. The new membrane has to turn up under the tiles or slates, with a flashing that sheds water over it. Where the old detail used lead, we reinstate or replace it. Small roofs also leave little room for error at the drip edge: the front trim must throw water clear of the window frame and fascia, and any gutter has to be big enough for the area it drains. Dormer cheeks with tile hanging or cladding are checked for gaps that let water behind.

If you are also planning insulation upgrades or work on the main roof, tell us at survey so the scaffold can be shared.

Which towns in Cheshire do we cover?

• Warrington
• Chester
• Crewe
• Ellesmere Port
• Widnes
• Macclesfield
• Northwich
• Great Sankey
• Winsford
• Congleton
• Wilmslow
• Sandbach
• Nantwich
• Neston

Everything about dormer roofs → · All flat roofing in Cheshire →