Windsor at a glance
- Postcode districts
- SL4
- Population
- about 31,560 (GeoNames)
- Council area
- Royal Borough of Windsor and Maidenhead
- Building approval
- Royal Borough of Windsor and Maidenhead building control, or a registered building control approver
- Nearest main town
- Slough, about 2 miles
- Guide price region
- South East (+10% on West Midlands rates)
What flat roof work do we do in Windsor?
Emergency leak repairs
Older felt roofs in Windsor that have lost their chippings dry out and crack, and a cold snap can open those cracks enough to let water through. A temporary repair stops the immediate leak, but a roof like that often needs a frank conversation about replacement.
GRP fibreglass roofing
If a flat roof in Windsor has already been patched with fibreglass that keeps cracking, a full GRP replacement on a new, properly fixed deck often solves the problem. Cracks usually come from movement in the boards beneath, so renewing the deck and reinforcing the joints deals with the cause.
Single-ply membrane roofing
On exposed sites in Windsor and elsewhere, mechanically fixed single-ply is specified with a fixing pattern based on wind uplift, with extra fasteners at corners and edges. That makes it a strong option for commercial roofs where wind loads are a concern.
All flat roof services in Windsor:
- EPDM rubber roofing
- Flat roof repairs
- Warm roof insulation upgrades
- Extension and kitchen roofs
- Flat roof replacement
- Balconies and roof terraces
- Emergency leak repairs
- Garage roofs
- GRP fibreglass roofing
- Flats, HMOs and block roofs
- Green and sedum roofs
- Dormer roofs
- Liquid-applied roofing
- Single-ply membrane roofing
- Commercial flat roofing
- Flat roof surveys and leak tracing
- Torch-on felt roofing
How much does a flat roof cost in Windsor?
Guide prices at South East rates including VAT. New and replacement roofs get a fixed price after a free survey; repair prices are confirmed once we've found the problem.
| Job | Guide price inc VAT |
|---|---|
| Single garage (18 m²), EPDM rubber | £1,750–£3,100 |
| Extension (20 m²), felt, new deck + insulation | £3,000–£5,150 |
| Dormer (8 m²), GRP, scaffold | £1,550–£2,900 |
| Condition survey and leak investigation | £170–£330 |
| Localised patch repair | £170–£550 |
What flat roofs are typical in and around Windsor?
In a town like Windsor flat roofs are mostly on 1960s and 1970s link-detached houses with flat-roofed garages and porches and 1930s semis with flat-roofed garages and kitchen extensions. Local weather shapes the specification. 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. Approximate 1991–2020 regional averages based on Met Office data.
Who approves flat roof work in Windsor?
Where approval is needed it goes to Royal Borough of Windsor and Maidenhead building control, or a registered building control approver. 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. How the rules work.
Which places near Windsor do we cover?
- Slough · 2 mi
- Egham · 4 mi
- Staines-upon-Thames · 5 mi
- Maidenhead · 6 mi
- Ascot · 6 mi
- Ashford, Surrey · 7 mi
Flat roofing in Windsor: questions
Do you cover Windsor?
Yes, including postcode districts SL4. Send your postcode with your enquiry and we'll arrange a survey.
How much is a new flat roof in Windsor?
A typical 18 m² EPDM garage roof is £1,750–£3,100 and a 20 m² insulated EPDM extension roof is £3,100–£5,350, at South East guide rates including VAT.
Do you also cover Slough?
Yes. Slough is about 2 miles from Windsor and we cover it too.
What's the best flat roof system for a house in Windsor?
For most garages and extensions it's EPDM or GRP; torch-on felt is the budget option and liquid suits detailed or overlay jobs. We recommend one at the survey.