Hatfield at a glance
- Postcode districts
- AL9, AL10
- Population
- about 41,265 (GeoNames)
- Council area
- Welwyn Hatfield Borough Council
- Building approval
- Welwyn Hatfield Borough Council building control, or a registered building control approver
- Nearest main town
- St Albans, about 5 miles
- Guide price region
- East of England (+5% on West Midlands rates)
Why choose GRP fibreglass roofing in Hatfield?
GRP is a good fit in Hatfield for roofs with awkward shapes, short runs of upstand and lots of corners, because every detail is laminated in place rather than cut and glued. Where a sheet membrane would need many joins, fibreglass forms one continuous skin across the whole roof.
Around Hatfield, flat roofs are common on terraced streets with flat-roofed rear kitchens and bathrooms and on shops with flat-roofed rear stores below flats. The East of England is the driest part of Britain, with parts of the Anglian region around 630 mm a year, so summer heat and UV, not rainfall, do most of the ageing on a felt roof.
How much does a GRP fibreglass roof cost in Hatfield?
Guide price in Hatfield: £3,150–£5,650 for a 20 m² extension roof in GRP with a new deck and insulation, including VAT at East of England rates. The fixed price comes after a free survey for new and replacement roofs.
| Job | Guide price inc VAT |
|---|---|
| Extension (20 m²), GRP, new deck + insulation | £3,150–£5,650 |
| Dormer (8 m²), GRP, scaffold | £1,450–£2,800 |
| Single garage (18 m²), GRP fibreglass | £1,850–£3,400 |
| Single garage (18 m²), EPDM rubber | £1,700–£2,950 |
| Extension (20 m²), EPDM, new deck + insulation | £2,950–£5,150 |
Will a new GRP roof need extra insulation to meet building regulations?
If the roof is over a heated room and you are replacing more than half of it, usually yes. In England, Wales and Northern Ireland that counts as renovating a thermal element, and in Scotland the council's building standards service will say whether a building warrant applies.
GRP pairs well with a warm roof because the new deck boards it needs can sit on top of the insulation. The result is thicker, so we check at survey that there is room under door cills and wall flashings, and that the upstands can finish around 150 mm above the new surface. Where approval is needed we arrange it with building control or building standards.
Unheated, detached garages normally sit outside the thermal rules. See the building regulations page for each nation, or the warm vs cold roof guide for why we avoid cold roofs where we can.
What's included?
- Warm-roof insulation and vapour control layer where the room below is heated
- New OSB3 or plywood deck, fixed at close centres
- Coloured UV-stable topcoat, with anti-slip finish on request
- Resin and glass-mat laminate with taped and reinforced joints
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?
- Welwyn Garden City · 3 mi
- St Albans · 5 mi
- Potters Bar · 5 mi
- Hertford · 7 mi
- Harpenden · 7 mi
- Borehamwood · 8 mi
GRP fibreglass roofing in Hatfield: questions
Do you cover Hatfield?
Yes. Hatfield is part of our Hertfordshire coverage, including postcode districts AL9, AL10. 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 Hatfield?
Where the work needs approval it goes to Welwyn Hatfield Borough 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 Hatfield?
£3,150–£5,650 for a 20 m² extension roof in GRP with a new deck and insulation, at East of England 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.
What colours does a GRP roof come in?
Topcoats are typically available in greys, greens, black and some other shades. Lighter colours absorb less heat, and an anti-slip finish can be added where people will walk on the roof.