Flat RoofingContractors

Flat roof systems

GRP fibreglass roofing in New Milton

Thinking about a GRP roof for a dormer or extension in New Milton? The finish is rigid and tidy, with trims moulded into the roof rather than glued on. It does need a dry day and a new deck, so we survey first, explain what is involved and give you a fixed written quote with no obligation.

Finished grey GRP fibreglass flat roof with moulded trims on a single-storey extensionComputer-generated example image

New Milton at a glance

Postcode districts
BH25
Population
about 25,546 (GeoNames)
Council area
New Forest District Council
Building approval
New Forest District Council building control, or a registered building control approver
Nearest main town
Bournemouth, about 10 miles
Guide price region
South East (+10% on West Midlands rates)

Why choose GRP fibreglass roofing in New Milton?

Landlords and small businesses in New Milton often favour GRP on roofs that contractors need to access for plant, aerials or gutter clearance. The surface resists scuffs better than a soft membrane, and small damage can usually be ground back and re-laminated without disturbing the rest of the roof.

In and around New Milton, flat roofs are typically found on 1930s semis with flat-roofed garages and kitchen extensions, and on low-rise post-war blocks of flats. 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.

How much does a GRP fibreglass roof cost in New Milton?

For New Milton we use South East rates: £3,300–£5,900 is the guide for a 20 m² extension roof in GRP with a new deck and insulation, VAT included. The fixed price comes after a free survey for new and replacement roofs.

JobGuide price inc VAT
Extension (20 m²), GRP, new deck + insulation£3,300–£5,900
Dormer (8 m²), GRP, scaffold£1,550–£2,900
Single garage (18 m²), GRP fibreglass£1,950–£3,600
Single garage (18 m²), EPDM rubber£1,750–£3,100
Extension (20 m²), EPDM, new deck + insulation£3,100–£5,350

How long does a GRP roof last, and is it guaranteed?

A properly laid GRP roof typically lasts 20 to 40 years. The range is wide because so much depends on the laminate being fully wetted out, the deck staying dry and stable, and the topcoat being renewed if it wears.

When GRP fails early, the cause is usually one of these:

  • resin laid in damp or cold conditions that never fully cured;
  • cracks at board joints or trims where movement was not allowed for;
  • a deck that was wet, soft or poorly fixed before laminating;
  • a thin or patchy topcoat that has weathered through.

On guarantees, manufacturer material guarantees are available on many specified GRP systems, and some need a registered build-up or an approved installer. Where registration is possible, we do it for you. Every re-roof also comes with our written workmanship guarantee, with the length set out in your quote, and you can ask about insurance-backed options. Read more in our guarantees guide.

What's included?

  • New OSB3 or plywood deck, fixed at close centres
  • Warm-roof insulation and vapour control layer where the room below is heated
  • Coloured UV-stable topcoat, with anti-slip finish on request
  • Removal of the old covering and disposal of waste

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?

GRP fibreglass roofing in New Milton: questions

Do you cover New Milton?

Yes. New Milton is part of our Hampshire coverage, including postcode districts BH25. 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 New Milton?

Where the work needs approval it goes to New Forest District 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 GRP fibreglass roof cost in New Milton?

£3,300–£5,900 for a 20 m² extension roof in GRP with a new deck and insulation, at South East guide rates including VAT. The fixed price comes after a free survey for new and replacement roofs.

Does GRP smell when it is being laid?

Yes, the resin gives off a strong styrene smell while it cures. It usually fades within a day or so, and we advise keeping nearby windows closed while the team works.

Can GRP be laid over an existing felt roof?

Generally no. GRP needs a clean, dry, rigid timber deck, so the old felt is usually stripped and the boards replaced before laminating.

Other flat roof work in New Milton

GRP fibreglass roofing in New Milton: get a fixed price

Free survey and a written fixed quote for replacement and new roofs. No obligation.

Call usGet a guide price