Reliable flat roofing across Berkshire, clear advice, tidy workmanship, and fixes that last

Flat Roofing in Berkshire

If your flat roof is leaking, holding water, or nearing the end of its lifespan, you need a solution that’s properly assessed and finished correctly, not a quick patch that fails again. We provide flat roof inspections, repairs, replacements and new installations across Berkshire for homeowners and property managers, with straightforward advice on what’s needed and why.

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Our Flat Roofing Services in Berkshire

We work on flat roofs for extensions, garages, dormers, bay roofs and commercial units across Berkshire. From small repairs to full replacements, we focus on long-term waterproofing, clean detailing, and sensible drainage so your roof performs properly in real British weather.

Flat Roof Installation

Flat roof installation is common on extensions and garage builds across Berkshire, and the quality of the build makes all the difference. We install flat roofing systems with proper preparation, correct falls for drainage, and strong detailing at edges and joins. The goal is simple, a flat roof that stays warm, dry, and dependable for the long run.
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Flat Roof Replacement

Flat roof replacement is often the right option when the roof has repeated leaks, widespread cracking, sagging, or a surface that’s reached the end of its life. We remove failing materials, check the structure underneath, and replace the roof with a system that suits the property and how the roof is used, so you’re not stuck in a cycle of constant call-outs.
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Flat Roof Repairs

Flat roof leaks are commonly caused by splits in the membrane, failed seams, damaged flashing, or blocked outlets that lead to standing water. Our flat roof repair work focuses on identifying the true entry point and fixing it properly, rather than guessing. Catching issues early usually prevents water ingress from spreading into insulation, joists, and internal finishes.
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Flat Roof Inspections

A flat roof inspection is the best starting point if you’re unsure whether you need a repair or a replacement. We check the roof surface, seams, edges, drainage points, and the areas where leaks typically start. You’ll get a clear explanation of what we’ve found and what the realistic options are, without pressure.
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Emergency Flat Roof Repairs

If water is coming in suddenly, the priority is to protect the property and stop the problem getting worse. Emergency flat roof repairs are aimed at making the roof watertight and reducing further damage, then advising on the permanent fix required to stop it returning.
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About Our Flat Roofing Work in Berkshire

Across Berkshire, we regularly see flat roofs on home extensions, garages, dormers and smaller commercial buildings, especially around towns like Reading, Wokingham, Bracknell, Slough, Maidenhead and Newbury. Many problems come from ageing felt systems, rushed edge detailing, and drainage that was never formed correctly, which leads to ponding after heavy rain. Flat roofs often fail early when outlets are blocked, falls are wrong, or seams and upstands are poorly finished. Our approach is to fix the weak points properly so the roof performs as it should.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

Flat Roofing Systems We Work With

The best flat roofing system depends on the roof’s size, exposure, access, and whether it needs to be walked on regularly. We work with a range of flat roof materials and will explain the pros and limitations of each option based on your property.

EPDM Rubber Roofing

EPDM is a durable rubber membrane often used for residential flat roofs such as garages and extensions. It handles movement well, performs reliably in UK conditions, and is a strong option when installed with correct preparation and clean edge detailing.

GRP Fibreglass Roofing

GRP fibreglass roofing creates a seamless, hard-wearing surface that suits many smaller flat roofs and areas where a tougher finish is useful. When applied correctly, it forms a strong waterproof layer and offers a clean, tidy look.

Torch-On Felt Roofing

Modern torch-on felt remains a practical option for certain properties when it’s layered and installed correctly. The key is a well-prepared base, strong detailing at edges and joins, and finishing that prevents water tracking and early failure.

Liquid Roofing Systems

Liquid roofing systems can be suitable where the roof has complex detailing or where an overlay approach is appropriate. They form a seamless waterproof layer and can be effective when installed with correct preparation, reinforcement and curing conditions.

Why Homeowners Across Berkshire Choose Alliance Roofing?

Homeowners choose Alliance Roofing because we keep things clear and practical. We inspect the roof properly, explain what’s wrong in plain terms, and give realistic options based on the condition of the roof, not guesswork. Our work focuses on the details that prevent repeat problems, especially drainage, seams, edges and upstands, and we treat your property with respect throughout the job.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

Trusted Roofing Services Across the
South East

Trusted across Berkshire for dependable flat roofing and straightforward advice

Removal of Chimney stack, replacement of roof underlay, guttering and flat roof repair. - Mitchell from Alliance Roofing & Building was the only builder, of many that I had contacted, that climbed a ladder to inspect my flat-roof and to climb into my loft-space to inspect the main roof from the inside. After an extensive review of my property and discussing my options, he emailed me his quotation on the same day. Booking in dates for Alliance & Roofing to commence work was quick and effortless. They arrived on time, completed the work as planned to a professional standard. Provided Photos of work carried out at all stages. I highly recommend Alliance Roofing & Building.

Checkatrade Verified reviewer - Job location: SL3

New roof on my bungalow - I recently had the pleasure of working with Alliance Roofing and Building to install a new roof on my bungalow, and I couldn't be more satisfied with the results. From start to finish, the entire process was smooth and professional. Mitchell, who led the project, was exceptional. His expertise and dedication were evident from the moment he arrived. He and his team were not only highly skilled but also incredibly helpful and courteous throughout the entire job. They took the time to answer all my questions

Checkatrade Verified reviewer - Job location: SL3

New slate roof - Mitchell and his team installed my new roof and I'm very satisfied. The quality is superb, they were professional, punctual, and communicative. The project finished on time and the site was left spotless.

Checkatrade Verified reviewer - Job location: SL9

Guttering repair - Mitchell came to repair my guttering, he was on time, polite, efficient and conscientious. He kept me informed at each stage of the work that was needed.

Checkatrade Verified reviewer - Job location: SL4

Roof repairs - Mitchell repointed a chimney and installed a chimney cowl. He also did some cementing work to the roof. Mitchell was very polite and a conscientious worker. He kept me informed throughout the job. Mitchell was able to give me a quote and do the repair work within a few days. I wouldn’t hesitate to recommend Alliance Roofing & Building.

Checkatrade Verified reviewer - Job location: SL6

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

Checkatrade Verified reviewer - Job location: HP4

Roof tile replacement and chimney repair - Mitchell and his team are reliable, efficient and hard working. We will certainly use them again in the future. Thanks guys

Checkatrade Verified reviewer - Job location: SL6

Chimey Removal & Other Minor Repairs - Mitchell was the only roofer who quoted for the job that actually took the time to go up on the roof to inspect the issue, which was appreciated at the time. He fitted us in around other jobs within 2 weeks to get the work done in a timely manner. The work (which included the removal of a chimney stack to below the roof line, repointing the ridge line, and various other patch repairs) appears to have been completed to a good standard (posting days after completion). Mitchell and his team were polite, conscientious and happy to help throughout the job.

Checkatrade Verified reviewer - Job location: SL6

Fixed the roof, including all the felting and repaired the chimney. - Good communication throughout. Good work. Very happy with the service.

Checkatrade Verified reviewer - Job location: SL6

Roof repair - Great, really friendly and nice team

Checkatrade Verified reviewer - Job location: SL6

Tile realignment/repair and felt renewal - Mitchell and his team were excellent. Would definitely recommend Alliance. The team were on time (in fact they were able to begin the job half a day earlier than initially discussed), polite, efficient and kept us informed of progress each day. We could not have asked for a better service.

Checkatrade Verified reviewer - Job location: SL6

Roof verge repair. - Mitchell was polite, friendly and knowledgeable. The team were polite and efficient. The work was completed for the price quoted, which was competitive, and in the timeframe advised.

Checkatrade Verified reviewer - Job location: HP13

repair of box gutter behind parapet wall - Mitchell undertook a detailed diagnosis of the work required, started the job quite quickly and completed it satisfactorily.

Checkatrade Verified reviewer - Job location: HP16

Leak in the roof- Very polite and professional. Job was completed professionally at a very good price. Would highly recommend

Checkatrade Verified reviewer - Job location: SL6

New slate roof - Mitchell and his team installed my new roof and I'm very satisfied. The quality is superb, they were professional, punctual, and communicative. The project finished on time and the site was left spotless.

Checkatrade Verified reviewer - Job location: SL9

Roof repairs - Mitchell repointed a chimney and installed a chimney cowl. He also did some cementing work to the roof. Mitchell was very polite and a conscientious worker. He kept me informed throughout the job. Mitchell was able to give me a quote and do the repair work within a few days. I wouldn’t hesitate to recommend Alliance Roofing & Building.

Checkatrade Verified reviewer - Job location: SL6

Roof tile replacement and chimney repair - Mitchell and his team are reliable, efficient and hard working. We will certainly use them again in the future. Thanks guys

Checkatrade Verified reviewer - Job location: SL6

Chimey Removal & Other Minor Repairs - Mitchell was the only roofer who quoted for the job that actually took the time to go up on the roof to inspect the issue, which was appreciated at the time. He fitted us in around other jobs within 2 weeks to get the work done in a timely manner. The work (which included the removal of a chimney stack to below the roof line, repointing the ridge line, and various other patch repairs) appears to have been completed to a good standard (posting days after completion). Mitchell and his team were polite, conscientious and happy to help throughout the job.

Checkatrade Verified reviewer - Job location: SL6

Fixed the roof, including all the felting and repaired the chimney. - Good communication throughout. Good work. Very happy with the service.

Checkatrade Verified reviewer - Job location: SL6

Roof repair - Great, really friendly and nice team

Checkatrade Verified reviewer - Job location: SL6

Tile realignment/repair and felt renewal - Mitchell and his team were excellent. Would definitely recommend Alliance. The team were on time (in fact they were able to begin the job half a day earlier than initially discussed), polite, efficient and kept us informed of progress each day. We could not have asked for a better service.

Checkatrade Verified reviewer - Job location: SL6
REVIEWS
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Our Process
Inspection and advice

We assess the roof’s condition and identify the cause of any issues. You’ll get a clear explanation of what we’ve found and what the sensible next steps are.

Clear quote and scheduling

We provide a straightforward quotation that explains what’s included. Once agreed, we schedule the work around what’s practical for you and the job.

Installation, repair, and final checks

We carry out the work with careful detailing and watertight finishes. Final checks are completed at the end so you’re not left hoping everything has been done properly.

[FAQ]

Frequently Asked Questions

How do I know if my flat roof needs repairing or replacing?
What are the most common causes of flat roof leaks?
How long does flat roofing work usually take?
Is ponding water on a flat roof a problem?
Can you repair a flat roof in winter?
What flat roofing system is best for my property?
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