Havering at a glance
- Postcode districts
- RM1, RM7, RM2, RM5, RM11, RM12, RM3, RM14
- Council area
- London Borough of Havering
- Building approval
- London Borough of Havering building control, or a registered building control approver
- Guide price region
- London (+20% on West Midlands rates)
What does a dormer roof in Havering need?
Buyers' surveys in Havering often flag dormer roofs, because they are hard to see from the ground and easy to neglect. A recent replacement, with building control sign-off where needed and written guarantees, answers that question before it becomes a problem in the sale.
In a town like Havering, flat roofs are commonly found on mansion blocks and purpose-built flats with large flat roofs or kitchen extensions and roof terraces behind period houses. The Thames basin is one of the drier parts of Britain at roughly 730 mm of rain a year, but summer heat is the bigger test here: dark membranes on south-facing roofs swing a long way in temperature.
How much does a new dormer roof cost in Havering?
Guide price in Havering: £1,700–£3,200 for an 8 m² GRP dormer roof including scaffold, including VAT at London rates. The fixed price comes after a free survey for new and replacement roofs.
| Job | Guide price inc VAT |
|---|---|
| Dormer (8 m²), GRP, scaffold | £1,700–£3,200 |
| Single garage (18 m²), EPDM rubber | £1,900–£3,350 |
| Extension (20 m²), GRP, new deck + insulation | £3,600–£6,450 |
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?
- Strip-out of the old covering and deck repairs
- New membrane, drip trims and back-edge abutment under the tiles
- Warm-roof insulation and a vapour control layer
- Scaffold with edge protection, priced in the quote
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 Havering: questions
Do you cover Havering?
Yes. Havering is part of our London coverage, including postcode districts RM1, RM7, RM2, RM5, RM11, RM12 and 2 more. 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 Havering?
Where the work needs approval it goes to London Borough of Havering 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 Havering?
£1,700–£3,200 for an 8 m² GRP dormer roof including scaffold, at London guide rates including VAT. The fixed price comes after a free survey for new and replacement roofs.
Will insulating my dormer roof make it higher?
Yes, by the insulation thickness. We plan the build-up so the new roof still sits correctly under the main roof tiles at the back edge.
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.