Flat roofing in Andover — GRP fibreglass, EPDM rubber and felt systems for extensions, garages and outbuildings. 25-year guarantee. Free quotes across SP10 with no call-out fees.
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📞 Call Now: 0172 223 9611Flat roof failures are one of the most common calls we receive from Andover's New Town estate housing. The large stock of 1970s and 1980s semi-detached and detached properties — Charlton, Foxcott, Weyhill Road — was typically built with rear kitchen and utility extensions covered by three-layer felt flat roofing. These systems, now 40-50 years old, have gone well beyond their design life. The felt has dried out, split along ridges, and in many cases is held together more by the accumulated repair sealant than by the original material.
GRP fibreglass is the correct replacement for Andover's climate. The town's exposed Downs position means greater temperature swings than sheltered valley towns — summer highs and winter lows that stress any membrane. GRP's seamless monolithic structure has no joints to fail and handles thermal cycling without cracking. A GRP flat roof installed correctly in Andover should last 30+ years without maintenance beyond an occasional clean.
Free quotes · No call-out fee
Flat roofs fail differently to pitched ones — the signs are ponding, splits and blistering rather than slipped tiles.
When it is not the answer: If the membrane is sound and only a flashing or upstand has failed, a localised repair beats a full recover — we'll tell you which you need. Read the full guide.
We check the deck, falls, upstands and outlets, and establish whether it's a repair or a recover.
Itemised quote specifying the system — EPDM rubber, GRP fibreglass or high-performance felt — and the price.
Booked around a dry window; flat-roof systems need dry conditions to bond.
We strip the failed covering, correct the falls and insulation where needed, and lay the new membrane with dressed edges and outlets.
Site cleared, outlets tested, and the guarantee handed over.
| Job | Typical duration |
|---|---|
| Small flat roof repair | 2–4 hours |
| Garage or extension recover | 1–2 days |
| Large flat roof (EPDM/GRP) | 2–4 days |
| Warm-deck rebuild with insulation | 3–5 days |
Membranes need dry, mild conditions to bond — we won't lay in rain or hard frost.
Access is often from a tower or short scaffold depending on height and the deck. Scaffold is specified for: first-floor flat roofs, anything over a garage height, or where edge protection is required - always itemised in your written quote, never a hidden extra, and we arrange it.
Victorian terraces near the old town with very large post-war and modern estates around them; extensive concrete-tile stock. Pavement scaffold and skip permits go through Test Valley Borough Council; allow a few working days on streets like the older streets around the centre where space is tight.
| Job | Typical range | Notes |
|---|---|---|
| Small flat roof repair | £180–£500 | Localised patch |
| Felt garage roof recover | £800–£1,600 | High-performance felt |
| EPDM rubber roof | £1,600–£4,000 | Single-ply, 20yr+ warranty |
| GRP fibreglass roof | £2,000–£5,000 | Seamless, durable |
| Warm-deck rebuild w/ insulation | £2,500–£6,000 | Meets current regs |
Worked example: An EPDM rubber recover on a typical single-garage roof in Andover: around £1,400 including strip and disposal.
No deposit on repairs under £500; staged payments on larger jobs with nothing up front before materials are on site. Repairs are standard-rated; a full re-roof usually attracts 5% VAT.
Covering SP10, SP11 and surrounding postcodes.
EPDM and GRP systems carry long manufacturer warranties (often 20 years+) alongside our 10-year workmanship guarantee.
If a fault appears in covered work, we come back and put it right. No quibbling, no re-charge.
Minimal inside the home — work is external, though there may be some odour from adhesives on the day, which clears quickly. You do not need to stay home for external work - we just need power and access agreed in advance.
Flat-roof work is the most weather-sensitive we do; we schedule tightly around dry spells and never leave a deck exposed. Test valley town on the chalk; exposed edges catch the wind.
"Rear extension flat roof — third felt repair in five years, finally had it done properly in GRP. Completed in a day, dry since. Should have done it much sooner."
"Garage flat roof replacement. EPDM rubber, neat finish, no fuss. Good price for the work."
A minimum fall of 1:80 to the drainage outlet is non-negotiable on every flat roof we install. A completely flat or reverse-fall roof pools water, accelerates membrane failure, and creates structural loading in winter. On Andover's 1960s-80s rear extension stock, many existing flat roofs were built with insufficient fall — we assess and correct this as part of any replacement. The additional cost of building correct falls into the deck structure is small against the extended membrane life it delivers.
GRP fibreglass £70-£100/m2 installed. A standard garage roof of ~20m2 costs £1,400-£2,000. Free surveys and accurate quotes — call 0172 223 9611.
Yes. Andover's exposed position means greater thermal cycling than valley towns. GRP's seamless structure handles this without joint failure, which is the primary failure mode in felt systems.
A standard extension or garage roof takes one day for GRP installation. Larger or more complex areas take 1-2 days.
Yes — all SP10 postcode areas including Charlton, Foxcott, Weyhill, Enham Alamein and surrounding villages.
GRP fibreglass is our primary recommendation for Andover properties. The exposed Hampshire Downs position at 80 metres means flat roofs see greater UV exposure and temperature cycling than valley-floor sites — GRP handles this better than felt, with greater resistance to surface cracking from thermal movement. EPDM rubber is an alternative for larger areas. We do not install new felt as a permanent flat roofing solution.
A standard rear extension flat roof of 20-40m2 takes one full day for GRP installation. Larger areas — 60m2 or above — take two days. We need dry weather for the lamination cure. We schedule around forecast conditions and confirm the working day when booking.
Replacing an existing flat roof like-for-like does not require planning permission. Changing the height or slope of an existing roof structure, or adding a flat roof where there was none before, may require consent depending on the property and location. We advise on the planning position for your specific work before quoting.
Andover's exposed chalk plain position at 80 metres gives flat roofs here a harder working environment than valley-floor sites. Temperature differentials between summer sun and winter frost are more extreme on the open plateau, and UV loading on south-facing flat roof surfaces is higher than in sheltered positions. This is why we do not install new felt flat roofing in Andover — its 10-15 year design life is shortened further by this environment, and the 25-year GRP or EPDM alternative costs little more per year of service life. All our flat roof installations in Andover use GRP fibreglass or EPDM rubber as standard.
No call-out fees. No obligation. Just an honest quote from a local Salisbury roofer who turns up when they say they will.
0172 223 9611