Flat roofing you can trust across Buckinghamshire, installed and repaired properly, not patched and forgotten

Flat Roofing in Buckinghamshire

If your flat roof is leaking, sagging, holding water, or simply getting old, you need a fix that lasts, not a quick patch that fails again next winter. We provide flat roof inspections, repairs and replacements across Buckinghamshire, with clear advice on what needs doing, why it needs doing, and what your options are.

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Our Flat Roofing Services in Buckinghamshire

We work on flat roofs for extensions, garages, dormers and commercial units across Buckinghamshire. Whether it’s a small repair or a full replacement, we focus on getting the roof watertight, improving drainage, and using the right system for the building, not just the cheapest option.

Flat Roof Installation

Flat roof installation is common on new extensions and garage builds, and it’s also where many problems begin if the roof isn’t formed correctly. We install flat roofs with proper preparation, correct detailing at edges and joins, and sensible drainage, so you don’t end up with ponding water and early leaks a few years down the line.
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Flat Roof Replacement

If your flat roof has repeated leaks, widespread cracking, or a failing surface that’s beyond sensible repair, replacement is usually the right call. We remove the worn system, inspect what’s underneath, and rebuild using a flat roofing solution that suits the roof’s use, exposure, and condition, so the replacement isn’t just new, it’s better.
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Flat Roof Repairs

Flat roof leaks in Buckinghamshire often come down to failed joins, splits in the membrane, damage around upstands, or blocked outlets that cause standing water. We don’t guess. We find where water is getting in, explain what’s failed, and carry out repairs that deal with the cause, not just the symptom.
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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 replacement. We check the roof surface, seams, edges, drainage points, and vulnerable areas where leaks commonly start. You’ll get a clear explanation of what we’ve found and what the realistic next steps are.
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Emergency Flat Roof Repairs

If water is coming in suddenly, you need fast action to protect the inside of your property. Emergency flat roof repairs focus on making the roof watertight and preventing further damage, then advising on any follow-up work needed to stop the issue returning.
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About Our Flat Roofing Work in Buckinghamshire

We carry out flat roofing work across Buckinghamshire on a mix of older homes, modern estates, and properties with extensions and garage roofs that have been added over time. A lot of flat roof issues locally come from ageing felt systems, tired detailing around edges, and drainage that was never set up properly, leading to standing water after heavy rain. Flat roofs in Buckinghamshire often fail early when the roof falls are wrong, outlets are poorly positioned, or corners and joins are rushed. We focus on fixing those 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

Not every flat roof system is right for every property. The best option depends on how the roof is used, how exposed it is, and what condition the existing roof is in. We’ll explain the pros and limitations of each option and recommend what makes sense for your building.

EPDM Rubber Roofing

EPDM is a durable rubber membrane commonly used for residential flat roofs such as garages and extensions. It performs well in UK weather, handles movement without cracking, and is a solid option when installed with the correct preparation and edge detailing.

GRP Fibreglass Roofing

GRP creates a seamless, hard-wearing surface that suits many flat roofs, especially where a tougher finish is useful. It’s often chosen for smaller roofs and areas where clean detailing matters, as it forms a strong waterproof layer when applied correctly.

Torch-On Felt Roofing

Torch-on felt is a modern take on a traditional system and can be a practical choice for certain flat roofs. The key is correct layering, clean edges, and a properly prepared base. Done right, felt can be dependable, done badly, it becomes a repeat leak problem.

Liquid Roofing Systems

Liquid roofing systems can be useful where the roof has awkward detailing or where an overlay solution is appropriate. They form a seamless waterproof layer and can be effective when installed with the correct primers, reinforcement and preparation.

Why Homeowners Across Buckinghamshire Choose Alliance Roofing?

People choose Alliance Roofing because we keep it straightforward. We inspect the roof properly, explain what’s actually wrong, and give clear options without pushing you into the most expensive route. Our work is planned to prevent the usual flat roof failures, especially around drainage, joins and edges, and we treat your property with respect from first visit to final checks.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

Trusted Roofing Services Across the
South East

Known across Buckinghamshire for reliable workmanship and clear 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 start by assessing the roof’s condition and the cause of any issues. You’ll get a clear explanation of what we’ve found and what options make sense based on the roof, not guesswork.

Clear quote and scheduling

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

Installation, repair, and final checks

Whether it’s a repair or a replacement, we focus on clean detailing and watertight finishes. We carry out final checks at completion, so you’re not left hoping it’s been done right.

[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?
Can you repair a flat roof in winter?
Is ponding water on a flat roof a problem?
What flat roofing system is best for my property?
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