GRP Fibreglass Roofs in London
City Building and Roofing Ltd are a leading GRP fibreglass roofing specialist in London and Surrey. 25-year guarantee. City & Guilds trained team. Free quotes — call 01932 950 995.
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A GRP roof is a seamless fibreglass flat roof system, ideal for extensions, balconies, dormers and garages. City Building and Roofing Ltd install and repair GRP fibreglass roofs across London and Surrey, backed by a 25-year manufacturer warranty and our own workmanship guarantee, with free written quotes.
City Building and Roofing Ltd are a leading provider of Glass Fibre Roofing (GRP) in London and Surrey. We employ a talented team of professional tradesmen with the skills and experience necessary to install or repair GRP roofs to the highest possible standard.
GRP roofing — also known as fibreglass roofing — combines polyester resin with distributed strand mat glass fibres to create an extremely durable and attractive flat roofing surface. Contrary to popular belief, fibreglass roofs are not a new invention — they have been used in the British building industry for over 50 years and are considered one of the best flat roofing materials available. They are affordable, quick to install and can be shaped without heat, which makes them popular for residential and commercial clients alike.
We have been installing and repairing GRP roofs in London for over 10 years. We are confident enough in our installations to offer a 25-year guarantee on new GRP roofs, along with a minimum 10-year insurance-backed guarantee and £5,000,000 public liability insurance.
Our GRP Roofing Services
GRP Roof Installation
Our skilled tradesmen plan and install GRP roofs that look stunning, are hard-wearing and protect your property from the elements. We install GRP on domestic extensions, garages, outbuildings and commercial properties.
GRP Roof Repairs
Although GRP roofs are extremely durable, they can develop hairline cracks over time. Our tradesmen can repair these blemishes, restoring both the structural integrity and the appearance of your roof.
GRP Refurbishments
We can clean and reseal your existing glass fibre roof, ensuring it remains in excellent condition and extending its lifespan significantly — a cost-effective alternative to full replacement.
GRP for Extensions
GRP flat roofing is one of the most popular choices for residential extensions in London. We install GRP roofs on single and double-storey extensions throughout London and Surrey.
Benefits of GRP Fibreglass Roofing
- Extremely durable — a correctly installed GRP roof can last 25+ years
- Seamless, watertight surface with no joins or weak points
- Can be shaped and moulded without heat — ideal for complex roof shapes
- Low maintenance once installed — no annual treatment needed
- Attractive, clean finish that enhances your property's appearance
- Suitable for walkable and non-walkable flat roof applications
- 50+ year track record of use in the UK building industry
Why Choose City Building and Roofing for GRP?
- Over 10 years installing and repairing GRP roofs in London
- All GRP installations performed by City & Guilds qualified tradesmen
- 25-year guarantee on new GRP installations
- Minimum 10-year insurance-backed guarantee — valid even if we cease trading
- £5,000,000 public liability insurance
- Best GRP materials from leading trade suppliers
- GRP roofing services throughout London and the South East
Interested in a GRP Fibreglass Roof?
Call us today for a free, no-obligation quote. We install and repair GRP roofs throughout London and Surrey — including Kensington, Chelsea, Fulham, Westminster and Central London.
Common Problems We Fix
Hairline cracking
GRP applied over a flexing or poorly prepared deck can craze and crack. We assess whether a repair or a re-lay is appropriate.
Delamination
Where the laminate has lifted from the deck, water can travel beneath it. We cut out and re-bond the affected area.
Trim and edge failures
Drips and leaks often start at the edge trims. We refix or replace trims and re-laminate the detail.
Cracks at upstands and corners
Movement concentrates stress at upstands and corners. We reinforce and re-coat these details.
Surface wear and dullness
Heavy foot traffic dulls and thins the topcoat. We re-apply topcoat to restore protection.
Repairs to existing GRP
We repair GRP roofs installed by others, matching the build-up and making a durable, watertight repair.
How Our Process Works
Survey
We check the deck, the falls and the existing detailing.
Deck preparation
A sound, dry, rigid deck is essential; we repair or re-board where needed.
Lay-up
We install the GRP matting, resin and topcoat to manufacturer specification.
Detailing
Trims, upstands and outlets are formed for a fully watertight finish.
Guarantee
A 25-year manufacturer warranty plus our workmanship guarantee, eligible for insurance-backed cover.
How Much Does It Cost?
GRP roof costs depend mainly on the roof area, the condition of the deck beneath and the amount of detailing — upstands, trims and outlets. A simple garage or extension roof is at the lower end; larger roofs or those needing a new deck cost more.
- The area of the roof
- Condition of the timber deck — re-boarding adds cost
- Amount of detailing, upstands and trims
- Access and edge protection
- Whether it is a new installation or a repair
City Building and Roofing Ltd provide free written quotes before any work begins, across London and Surrey.
Get a Free Quote
Find City Building and Roofing Ltd on Google
Customers across London and Surrey can find City Building and Roofing Ltd on Google to read reviews, view recent work and contact the team directly. We recommend calling the correct local number for your area — Surrey enquiries on 01932 950 995 and London enquiries on 020 7118 0095.
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Frequently Asked Questions
How long does a GRP roof last?
A correctly installed GRP fibreglass roof should last 25 years or more, and ours is backed by a 25-year manufacturer warranty plus our workmanship guarantee. Lifespan depends on correct installation, adequate falls and the roof not being subjected to constant heavy foot traffic.
Is GRP better than felt?
GRP fibreglass is generally more durable than traditional felt, with a seamless finish and no laps to fail, though it costs more upfront. For roofs you want to install once and forget, GRP is often the better long-term value, while felt remains a sound budget option.
Can a GRP roof be repaired?
Yes. Localised cracks, delamination and trim failures on a GRP roof can usually be cut out, re-bonded and re-laminated, and a worn topcoat can be re-applied. We repair GRP roofs installed by others as well as our own, and advise honestly when a re-lay is the better option.
Can you walk on a GRP roof?
A correctly installed GRP roof will take occasional foot traffic for maintenance, and walkway grades are available for balconies and terraces. Constant heavy traffic will wear the topcoat over time, so for regularly used areas we specify a hard-wearing, slip-resistant finish.
How long does it take to install a GRP roof?
A typical domestic GRP roof such as an extension or garage is installed in two to four days, depending on size, deck condition and the weather, as the resin needs dry conditions to cure. We confirm a realistic timeline in your written quote.
Does a GRP roof need dry weather to install?
Yes. GRP resin must be applied and cured in dry conditions above a minimum temperature, so installation is weather-dependent. We schedule around the forecast and will not lay GRP in unsuitable conditions, as this protects the quality and longevity of the finished roof.
Ready to Get Started?
Contact us today for a free, no-obligation quote. We serve all of London and Surrey with professional roofing and building services.
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