Borehamwood at a glance
- Postcode districts
- WD6
- Population
- about 36,322 (GeoNames)
- Council area
- Hertsmere Borough Council
- Building approval
- Hertsmere Borough Council building control, or a registered building control approver
- Nearest main town
- Watford, about 5 miles
- Guide price region
- East of England (+5% on West Midlands rates)
What does a dormer roof in Borehamwood need?
High, exposed dormers in Borehamwood take the full force of the wind and rain. Edge trims loosen, flashings lift and the felt at the drip edge cracks. Once the faults spread around the perimeter, a new roof with fresh trims usually lasts far longer than another round of repairs.
Around Borehamwood, flat roofs are common on shops with flat-roofed rear stores below flats and on 1960s and 1970s link-detached houses with flat-roofed garages and porches. The East of England is the driest part of Britain, with parts of the Anglian region around 630 mm a year, so summer heat and UV, not rainfall, do most of the ageing on a felt roof.
How much does a new dormer roof cost in Borehamwood?
Guide price in Borehamwood: £1,450–£2,800 for an 8 m² GRP dormer roof including scaffold, including VAT at East of England rates. The fixed price comes after a free survey for new and replacement roofs.
| Job | Guide price inc VAT |
|---|---|
| Dormer (8 m²), GRP, scaffold | £1,450–£2,800 |
| Single garage (18 m²), EPDM rubber | £1,700–£2,950 |
| Extension (20 m²), GRP, new deck + insulation | £3,150–£5,650 |
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.
What's included?
- Written workmanship guarantee, with building control handled where needed
- Strip-out of the old covering and deck repairs
- Warm-roof insulation and a vapour control layer
- Free survey of the dormer roof, cheeks and main roof junction
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 Borehamwood: questions
Do you cover Borehamwood?
Yes. Borehamwood is part of our Hertfordshire coverage, including postcode districts WD6. 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 Borehamwood?
Where the work needs approval it goes to Hertsmere Borough 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 Borehamwood?
£1,450–£2,800 for an 8 m² GRP dormer roof including scaffold, at East of England guide rates including VAT. The fixed price comes after a free survey for new and replacement roofs.
Can a dormer roof be replaced without scaffold?
Rarely. A tower or full scaffold is usually needed to give a safe working platform and edge protection at that height.
Is a dormer roof cheaper than a garage roof?
Not by as much as the size suggests. Scaffold and the extra detailing at height mean a small dormer roof often costs about the same as a single garage roof.