Caterham at a glance
- Postcode districts
- CR3
- Population
- about 20,957 (GeoNames)
- Council area
- Tandridge District Council
- Building approval
- Tandridge District Council building control, or a registered building control approver
- Nearest main town
- Crawley, about 13 miles
- Guide price region
- South East (+10% on West Midlands rates)
What does a dormer roof in Caterham need?
Dormer roofs in Caterham are often replaced when the loft room below starts to show damp, particularly along the back wall or around the window head. By then the deck may be wet, so a full rebuild with new insulation is usually the better choice than patching from a ladder.
In a town like Caterham, flat roofs are commonly found on lock-up garage blocks on estates or newer estates where the first extension roofs are now being replaced. 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 Caterham?
At South East guide rates, an 8 m² GRP dormer roof including scaffold comes to £1,550–£2,900 including VAT. The fixed price comes after a free survey for new and replacement roofs.
| Job | Guide price inc VAT |
|---|---|
| Dormer (8 m²), GRP, scaffold | £1,550–£2,900 |
| Single garage (18 m²), EPDM rubber | £1,750–£3,100 |
| Extension (20 m²), GRP, new deck + insulation | £3,300–£5,900 |
How long does a dormer roof replacement take?
The roofing itself typically takes one to three days, with scaffold going up before and coming down after. Allow a few extra days overall for the scaffold.
The room under the dormer stays usable, though it will be noisy during the strip-out, and dust can fall through gaps around the ceiling. Moving furniture away from the window helps. Scaffold usually needs space on the drive or garden, and sometimes a pavement licence. GRP has a strong smell while it cures, so keep the dormer windows shut on the day it is laid.
What's included?
- Written workmanship guarantee, with building control handled where needed
- New membrane, drip trims and back-edge abutment under the tiles
- Scaffold with edge protection, priced in the quote
- Strip-out of the old covering and deck repairs
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?
Dormer roofs in Caterham: questions
Do you cover Caterham?
Yes. Caterham is part of our Surrey coverage, including postcode districts CR3. Surveys and roofs are carried out by vetted roofing teams working under S&K Property Investments and Improvement Ltd.
Who checks building regulations for a flat roof in Caterham?
Where the work needs approval it goes to Tandridge District Council building control, or a registered building control approver. We tell you at the survey whether your job needs it and deal with the paperwork as part of the quote.
How much does a new dormer roof cost in Caterham?
£1,550–£2,900 for an 8 m² GRP dormer roof including scaffold, at South East guide rates including VAT. The fixed price comes after a free survey for new and replacement roofs.
Why does my dormer leak at the back where it meets the roof?
That junction is the most common leak point, usually because the upstand or flashing under the tiles has failed. A proper re-roof rebuilds it.
Can you replace the lead on my dormer at the same time?
Yes, where lead forms part of the dormer abutment or cheek flashings, we include renewing it in the roof job.