Dormer roofs in Egham

What does a dormer roof in Egham need?

In Egham, as anywhere, it often makes sense to replace a dormer roof while scaffold is already up for other work, such as new windows, rendering or repairs to the main roof. Sharing the scaffold keeps costs down and means every edge of the dormer can be checked at the same time.

In a town like Egham, flat roofs are commonly found on 1960s and 1970s link-detached houses with flat-roofed garages and porches or lock-up garage blocks on estates. Much of the South East sits in the drier Thames catchment at roughly 730 mm of rain a year, so the usual failures are at joints, upstands and outlets rather than from sheer volume of rain.

How much does a new dormer roof cost in Egham?

For Egham we use South East rates: £1,550–£2,900 is the guide for an 8 m² GRP dormer roof including scaffold, VAT included. The fixed price comes after a free survey for new and replacement roofs.

Is GRP or EPDM better on a dormer roof?

GRP fibreglass is often the first choice on a dormer, because it is laid as a liquid resin over a mat and forms neat, rigid edges, corners and drip details on a small roof. It cures to a hard surface that copes with occasional foot traffic during window cleaning or maintenance.

EPDM rubber works well on a plain rectangular dormer and can usually be laid as one sheet, with no field joins. Unlike GRP, it does not depend on resin curing conditions on the day. Torch-on felt can be used, but working a torch close to timber cladding, fascias and tiles needs extra care, so a cold-applied system is often chosen instead.

We recommend the system after surveying the dormer, its edges and how it meets the main roof.

What's included?

• Scaffold with edge protection, priced in the quote
• Warm-roof insulation and a vapour control layer
• New membrane, drip trims and back-edge abutment under the tiles
• Written workmanship guarantee, with building control handled where needed

Building regulations in England

Replacing more than half of a flat roof over a heated room usually counts as renovating a thermal element, so the roof is insulated to around 0.16 W/m²K where that's technically and economically feasible, and the work is notified to building control: the council or a registered building control approver, unless a registered competent person self-certifies it. A roof on a new extension is built to 0.15 W/m²K. Patch repairs, and most unheated detached garages, don't trigger the upgrade. Structural changes, or a new covering that adds 15% or more to the roof's weight, also need approval. More on the rules.

Which nearby areas do we also cover?

• Staines-upon-Thames · 2 mi
• Chertsey · 4 mi
• Ashford, Surrey · 4 mi
• Windsor · 4 mi
• Ascot · 5 mi
• Slough · 6 mi

Other flat roof work in Egham

• EPDM rubber roofing
• Flat roof repairs
• Flats, HMOs and block roofs
• Green and sedum roofs
• Single-ply membrane roofing
• Commercial flat roofing
• All services in Egham