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“They came out the same day, found the problem straight away and had it fixed before the rain came back. Honest price and very tidy. Highly recommended.”
Formby
Flat Roofs — Maghull, L31
Flat Roofs in Maghull — Replacing What the Original Builders Installed
Maghull’s post-war housing stock generates a steady volume of flat roofing work. The garages, rear extensions and integral car ports that are common on the estate housing built from the 1960s through to the 1980s were almost universally felted at construction. That original felt is now anywhere from forty to sixty years old, well past any reasonable service life expectation, and the majority of flat roof work we carry out in Maghull involves replacing these original systems with modern materials.
Our most commonly installed system for Maghull flat roofs is GRP fibreglass. It is a seamless, hard-wearing membrane that performs significantly better than the felt it replaces. Where original felt has failed on a Maghull garage or extension — cracking, blistering, failing at the fascia edge or simply losing its waterproofing integrity after decades of service — GRP provides a permanent, low-maintenance replacement that will outlast the original system by a substantial margin.
EPDM rubber is our alternative for larger flat roof areas, and torch-on felt remains an option for straightforward repairs or where budget is the primary consideration. We carry the materials for all three and advise genuinely on which is most appropriate based on the size, condition and use of the specific roof.
Before any flat roof work in Maghull, we assess the deck. Original decks on 1970s and 80s properties are frequently suffering from some degree of water damage beneath the existing covering, and installing a new system over a compromised deck produces a result that will underperform and require attention again sooner than it should. We address deck issues before they become hidden problems.
📞 Call for a free quoteModern housing flat roof specialists
We know the flat roof formats and original materials common on Maghull’s estate housing. We replace them properly.
GRP, EPDM and felt installations
All three systems carried and installed. We advise on which is best for each specific application.
Deck assessment first
Original decks on older Maghull properties frequently have water damage. We find it before the installation, not after.
10-year written guarantee
Every flat roof installation is covered by our written guarantee.
Building Regulations
Building Regs, U-Values & Warm Roof Upgrades
Current Building Regulations (Approved Document L) target a flat roof U-value of around 0.16–0.18 W/m²K. A full replacement covering more than 50% of the roof typically triggers this requirement — which means most flat roof replacements are also a genuine opportunity to properly insulate the roof, often for the first time. We build every full replacement to a warm roof specification (insulation above the deck) as standard, since it's now the recommended approach and largely eliminates the condensation risk that older cold roof designs carry. See our complete guide to Building Regs and warm roof upgrades for the full detail.
Common questions
Flat Roofs — What People Ask
My 1970s Maghull garage has a leaking flat roof — what are my options?
Most likely a full replacement — original felt from the 1970s has long exceeded its service life. We will assess the deck condition first. If the deck is sound, a GRP or EPDM system can be installed directly. If the deck is damaged, we replace that too. We give you a clear price before starting.
How much does a new flat roof cost in Maghull?
It depends on the size and the system specified. We inspect and give a written quote before any work begins. Call 07596 884288 for a free survey.
How long does a GRP flat roof last?
Twenty-five years or more when correctly installed. This compares favourably to torch-on felt, which typically lasts ten to fifteen years before needing replacement.
Do you handle garage flat roofs as well as house extensions?
Yes. Garage roofs are one of the most common flat roofing jobs we carry out in Maghull. We also install on car ports, outbuildings and rear extensions.
Does a flat roof replacement need to meet Building Regulations?
Yes, in most cases. A full replacement covering more than 50% of the roof is treated as a thermal element upgrade under Approved Document L, targeting a U-value of around 0.16-0.18 W/m²K. We build every full replacement to this standard, using warm roof construction, as a matter of course.