How Much Does a Bay Window Roof Replacement Cost in 2026? (UK)
Replacing a bay window roof in 2026 typically costs £900–£3,500, depending on the covering. A simple felt re-cover starts around £700, a GRP fibreglass bay roof runs £1,200–£2,500, and a traditional lead bay roof — the longest-lasting — costs £1,800–£3,500+. As a small, awkward job, minimum call-out, access and detailing make up much of the price.
How much is a bay window roof replacement in 2026?
Typical 2026 UK bay window roof costs:
- Felt re-cover (budget) — £700–£1,300
- EPDM rubber — £1,000–£1,900
- GRP fibreglass — £1,200–£2,500
- Lead (traditional / heritage) — £1,800–£3,500+
Most homeowners spend £1,200–£2,200 on a like-for-like bay roof replacement. Because it is a small, fiddly job at height, minimum call-out, access and the leadwork or trim detailing dominate the cost rather than the covering area itself.
Bay Window Roof Cost by Covering
A bay roof is only 2–5m², so the covering material and its detailing — not area — set the price. Here is what each option costs fitted.
Felt re-cover — budget option
Torch-on felt over the existing deck. The cheapest fix but the shortest-lived, at roughly 10–15 years. Fine as a temporary or low-budget solution. Usually a half-day.
EPDM rubber — good value, long life
A one-piece rubber membrane with no seams, lasting 25–40 years. A popular modern replacement for felt bay roofs where lead is not required for appearance.
GRP fibreglass — hard-wearing finish
A seamless glass-fibre laminate, moulded to the bay with a neat coloured topcoat and trims. Durable and smart-looking, lasting 20–30 years. A day's work.
Lead — traditional & longest-lasting
Code 4–6 sheet lead dressed over the bay with rolls and welts, as originally built on Victorian and Edwardian homes. The dearest but the most authentic and durable, lasting 60+ years. Often required in conservation areas.
What Actually Drives Your Bill
On such a small job, these factors matter more than the roof's size.
1. Covering material
Lead costs two to three times more than felt to fit, because of both the metal price and the skilled leadworker's time.
2. Minimum call-out
A bay roof is a small job, so a roofer's day-rate or minimum charge dominates. Bundling it with other work reduces the effective cost.
3. Access & height
A ground-floor bay may only need a tower; a first-floor bay or one over a porch needs scaffold, adding £150–£600.
4. Deck & timber condition
If the boarding or fascia has rotted from a long-standing leak, replacing it adds £100–£400 to the job.
5. Flashings & abutment
Where the bay roof meets the wall, new lead flashing and re-pointing may be needed to stop the leak returning.
6. Conservation requirements
In a conservation area or on a listed home, lead may be required to match the original, ruling out cheaper coverings.
Bay Window Roof Cost by UK Region
Based on a like-for-like lead bay roof replacement on a first-floor Victorian bay, including scaffold and flashings.
Real Project: Leaking lead bay roof, Edwardian semi, Nottingham
A first-floor bay on an Edwardian semi had been leaking where old lead had split. The homeowner had it re-covered in new Code 5 lead with fresh boarding, wall flashing and re-pointing to match the conservation-area street.
| Scaffold (front, 1 week) | £420 |
| Strip old lead & dispose | £160 |
| New boarding & timber repair | £240 |
| Code 5 sheet lead (~4m²) | £520 |
| Wall flashing & re-pointing | £180 |
| Skilled leadwork labour (1.5 days) | £820 |
| Total | £2,340 |
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