Flat Roofing in High Wycombe
If your flat roof in High Wycombe is leaking, holding water, or showing signs of wear, you need proper advice and a fix that lasts. We provide flat roof inspections, repairs, replacements and new installations across High Wycombe for homeowners and property managers who want the issue dealt with properly, not patched over.
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If your flat roof in High Wycombe is leaking, holding water, or showing signs of wear, you need proper advice and a fix that lasts. We provide flat roof inspections, repairs, replacements and new installations across High Wycombe for homeowners and property managers who want the issue dealt with properly, not patched over.
Our Services
About Our Flat Roofing Work in High Wycombe
In High Wycombe, we regularly work on flat roofs fitted to older garages, extensions and dormers where original felt systems are reaching the end of their lifespan. We also see problems caused by poor drainage, leading to ponding after rainfall, and weak edge detailing that allows water to track beneath the roof covering. Flat roofs in High Wycombe often fail early when these details are overlooked. Our work focuses on correcting those weak points so the roof performs reliably long term.
1,000
Project Completed
97%
Customer Satisfaction
40+
Years of Experience
Flat Roofing Systems We Work With
The most suitable flat roofing system depends on roof size, access, exposure and usage. We work with a range of flat roofing materials and explain which option is appropriate after inspecting the roof.
EPDM Rubber Roofing
EPDM rubber roofing is widely used on residential flat roofs in High Wycombe due to its flexibility and resistance to cracking. When installed correctly with secure edge detailing, it provides dependable waterproofing and handles movement well over time.
GRP Fibreglass Roofing
GRP fibreglass roofing forms a seamless, hard-wearing surface suited to smaller flat roofs and areas where a tougher finish is required. Applied properly, it delivers a strong waterproof layer with clean detailing around edges and outlets.
Torch-On Felt Roofing
Modern torch-on felt systems remain a practical option when layered and finished correctly. The lifespan of felt roofing depends heavily on preparation, drainage and detailing, which are common weak points on older flat roofs.
Liquid Roofing Systems
Liquid roofing systems can be suitable for flat roofs with complex shapes or detailing. They create a seamless waterproof coating and can be effective when installed under the right conditions with proper preparation.
Why Homeowners in High Wycombe Choose Alliance Roofing?
Homeowners in High Wycombe choose Alliance Roofing because we’re straightforward. We inspect the roof properly, explain the issue in plain language, and recommend work based on what the roof actually needs. Our focus on drainage, edges and detailing helps prevent repeat leaks and unnecessary future costs.
1,000
Project Completed
97%
Customer Satisfaction
40+
Years of Experience
Trusted Roofing Services Across the
South East
Trusted in High Wycombe for honest advice and dependable flat roofing work
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.
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
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.
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.
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.
Replacement of flat roof - Mitchell and his team are smart, communicative, skilled, friendly, helpful, trustworthy and reliable. I would highly recommend their roofing services.
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
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.
Fixed the roof, including all the felting and repaired the chimney. - Good communication throughout. Good work. Very happy with the service.
Roof repair - Great, really friendly and nice team
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.
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.
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.
Leak in the roof- Very polite and professional. Job was completed professionally at a very good price. Would highly recommend
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.
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.
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
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.
Fixed the roof, including all the felting and repaired the chimney. - Good communication throughout. Good work. Very happy with the service.
Roof repair - Great, really friendly and nice team
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.

We assess the roof thoroughly and explain what we’ve found so you can decide how to proceed with confidence.

You receive a clear quotation outlining the work involved. Once agreed, we schedule the job around access and weather conditions.
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All work is completed with careful detailing, followed by final checks to ensure the roof is fully watertight.
Frequently Asked Questions
If the damage is localised and the structure is sound, a repair may be sufficient. If there are repeated leaks, sagging or widespread deterioration, replacement is usually the better long-term option. An inspection will confirm this.
Common causes include failed seams, cracked coverings, damaged edges and blocked outlets that allow water to pool on the roof surface.
Minor repairs can often be completed in a day. Replacements depend on roof size, access and materials, with timescales confirmed after inspection.
Yes. Persistent ponding can shorten the life of a flat roof and increase the risk of leaks. It usually indicates drainage or fall issues that need addressing.
In many cases yes, depending on weather conditions and the roofing system involved. We advise on the safest and most effective approach after inspection.
It depends on roof use, exposure and condition. EPDM, GRP, felt and liquid systems all suit different situations. We explain the options clearly after inspecting the roof.

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