Flat roofs on Tunbridge Wells rear extensions and garage roofs — GRP fibreglass is our recommended system. Seamless, fully waterproof, 20–25 year warranty. The High Weald climate with its elevated rainfall suits a membrane that has no joints to fail. Free survey, fixed-price written quote.
GRP fibreglass, EPDM rubber and felt flat roofing systems for Tunbridge Wells extensions and outbuildings — free survey, written quote, 10-year workmanship guarantee.
Our most-installed system in Tunbridge Wells. Fully seamless — no joints, no laps, no weak points to exploit the elevated High Weald rainfall. The laminated fibreglass shell handles the steeper temperature swings common on elevated ridge-top properties better than felt. 20–25 year warranty.
Single-ply EPDM for larger or more complex flat roof shapes on Tunbridge Wells properties. Excellent flexibility accommodates the thermal movement on elevated, wind-exposed properties. 20-year warranty.
We always check the existing deck before installing a new membrane. On Tunbridge Wells Victorian properties, rear extension decks can be original construction — timber deck replacement is included in our quote if needed.
Three-layer high-performance felt where GRP or EPDM isn't appropriate. Torch-on polyester-reinforced felt as a minimum — 15–20 year lifespan in the Tunbridge Wells climate.
Flat roofs need correct falls to drain efficiently. The High Weald receives above-average annual rainfall — we design drainage to handle peak events, not just typical rainfall.
Flat roof replacement on extensions in Tunbridge Wells conservation areas is typically permitted development, but we flag any cases where planning advice may be needed before starting.
Tunbridge Wells receives approximately 730mm of annual rainfall — above the UK average — and the elevated position means temperature swings are more pronounced than in the Medway Valley. These factors together reduce the effective lifespan of traditional felt systems and make the case for GRP or EPDM particularly strong.
Rear extension flat roofs on Tunbridge Wells properties are often original Victorian or Edwardian construction — lean-to additions with shallow pitches and aging deck boards. We assess deck condition on every visit and include replacement where needed in our fixed-price quote.
Call 0173 224 1138 for a free, no-obligation survey and written quote. We cover Tunbridge Wells and the surrounding area from our Tonbridge base.
Typical price ranges. All quotes are free, written and fixed-price. Call 0173 224 1138.
| Job Type | Typical Cost | Timescale |
|---|---|---|
| GRP — small extension (up to 15m²) | £1,000–£2,000 | 1 day |
| GRP — medium extension (15–30m²) | £2,000–£3,800 | 1–2 days |
| EPDM — large flat area (30m²+) | £2,800–£5,500 | 2 days |
| Felt overlay (3-layer torch-on) | £700–£2,200 | 1 day |
| Deck replacement (add-on) | £250–£700 | Inc. in quote |
"GRP on the Victorian rear extension — old felt had been leaking for two winters. Deck boards sound, just the membrane needed. Clean installation in a day, no mess left in the garden. Exactly as quoted."
"EPDM on a larger complex flat roof above a rear kitchen extension and utility room — L-shaped with an awkward internal drainage point. They designed it properly, no ponding, no joins in the wrong place. Very impressed."
"Free survey, honest advice on GRP vs felt, fixed quote. The GRP was installed in a day and a half and the guarantee certificate arrived by post within the week. Professional throughout."
Tunbridge Wells receives above-average rainfall and the elevated ridge position means temperature swings are more pronounced. These factors shorten felt lifespan and make the seamless GRP system — which has no joints to fail — a significantly better long-term investment.
GRP fibreglass: 20–25 years. EPDM rubber: 20 years. High-performance felt: 15–20 years. The elevated rainfall in Tunbridge Wells sits these estimates at the lower end of the range if drainage isn't well-managed.
Like-for-like replacement doesn't require planning permission. If you're raising the structure or changing the appearance, permitted development rules apply — we'll advise.
GRP for a typical extension: £1,000–£3,800. Free survey and written quote on 0173 224 1138.
GRP fibreglass for most extensions up to ~40m². It's seamless and handles Kent conditions well. EPDM for larger or more complex shapes. We specify after a free survey.
Isolated splits, blisters or failed outlets can often be repaired. Once the deck has absorbed moisture, or membrane failure is widespread, replacement is better value. Free survey confirms which applies on your Tunbridge Wells property.
GRP on a typical kitchen extension: 1–2 days including deck preparation. Larger garage or complex area: 2–3 days. We leave the surface cured and ready before scaffolding comes down.
No call-out fee. No obligation. We serve Tunbridge Wells from our Tonbridge base.
0173 224 1138 ✉ Email Us