★★★★★ 9.96/10 CheckatradeFully insuredFree inspections
Flat roofing specialists

Flat Roofing in Buckinghamshire, Berkshire & London

Expert flat roof installation, repairs and maintenance for homes and businesses, using durable EPDM rubber, GRP fibreglass and felt systems. Free inspection, no call-out charge.

  • New flat roofs, re-roofs and repairs
  • EPDM, GRP fibreglass & felt systems
  • Long-lasting, low-maintenance, watertight
  • Fully insured, all work guaranteed
★★★★★ 9.96/10 on Checkatrade · 4.9★ on Google

Free flat roof quote

Tell us about your flat roof. We usually reply the same day.

🔒 No call-out charge. We never share your details.

9.96/10 Checkatrade
🏠 1,000+ roofs completed
🛡️ Fully insured & guaranteed
⏱️ 40+ years' experience
💷 No call-out charge
Flat roofing

Expert flat roofing solutions across the South East

At Alliance Roofing & Building, we provide expert flat roofing solutions, offering high-quality installations, repairs and maintenance for both residential and commercial properties. Whether you need a new flat roof, a re-roof, or repairs to an existing one, we deliver a durable, watertight finish built to withstand the elements.

Using premium materials such as EPDM rubber, GRP fibreglass and felt roofing, we deliver flat roofs that are not only long-lasting but also low maintenance. Our team serves Buckinghamshire, Hertfordshire, Berkshire, Surrey and London, providing tailored solutions for residential, commercial and industrial properties, from garage roofs and extensions to large commercial flat roofs.

What we do

Our flat roofing services include

New Flat Roof Installations

High-quality flat roofing designed for durability and efficiency, ideal for extensions, garages and dormers.

Flat Roof Repairs

Fixing leaks, cracks and damage to restore your roof's integrity and keep your property watertight.

Re-Roofing & Overlays

Upgrading existing flat roofs with new, weather-resistant materials for a longer lifespan.

GRP, EPDM & Felt Roofing

Expert installation of every major flat roofing system to suit your property and budget.

Materials

The right flat roof system for your property

EPDM Rubber

A seamless, single-piece rubber membrane that resists UV and weather, with a long service life and minimal maintenance.

GRP Fibreglass

A tough, seamless fibreglass system with a hard-wearing finish, ideal for balconies, dormers and high-traffic flat roofs.

Felt (Torch-on)

A proven, cost-effective multi-layer system that gives a reliable, watertight finish when professionally installed.

Verified Checkatrade reviews

Trusted across the South East

★★★★★ 103 verified Checkatrade reviews

✓ Checkatrade verified
★★★★★

"Replacement of a flat roof. Mitchell and his team are smart, communicative, skilled, friendly, helpful, trustworthy and reliable. I would highly recommend their roofing services."

— Flat Roof Replacement, HP4
✓ Checkatrade verified
★★★★★

"Mitchell was the only builder of many I contacted who actually climbed a ladder to inspect my flat roof and got into the loft. Quote the same day, work to a professional standard, photos at every stage."

— Flat Roof & Guttering, SL3
✓ Checkatrade verified
★★★★★

"Good communication throughout. Good work. Very happy with the service. They fixed the roof including all the felting and repaired the chimney."

— Felt Roof & Chimney, SL6
Flat roofing FAQs

Your questions, answered

What's the best type of flat roofing material? +
We offer EPDM rubber, GRP fibreglass and felt roofing, each chosen for durability and waterproofing. The best option depends on your roof size, use and budget, and we will advise at the free inspection.
How do I know if my flat roof needs replacing? +
Common signs include ponding water, cracks, leaks or general wear and tear over 15 to 20 years. We will inspect it and show you photos so you can make an informed decision.
How long does it take to install a new flat roof? +
Most flat roofs can be installed within 1 to 3 days, depending on the size and material.
Will a flat roof require frequent maintenance? +
Flat roofs need regular inspections to clear debris and ensure proper drainage, but modern systems are designed for long-term reliability.
Can you overlay a new flat roof on my existing one? +
In some cases, yes, but we will assess the condition first to make sure an overlay is the best option for you.
Is a flat roof more prone to leaks than a pitched roof? +
With correct installation and maintenance, modern flat roofs are just as watertight as pitched roofs.
Recent work

Recent flat roofing projects

Helpful guides

Roofing advice from our team

More services

Explore our other roofing services

Pitched Roofing

Installation and re-roofing in tile and slate.

Learn more →

Roof Repairs

Leaks, slipped tiles and storm damage fixed fast.

Learn more →

uPVC Installation

Fascias, soffits and guttering.

Learn more →

Need a flat roof installed or repaired?

Free inspection, no call-out charge, honest written quote, usually the same day.

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