Reliable flat roofing in High Wycombe, clear inspections and repairs that stop repeat leaks

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.

We carry out flat roofing work across High Wycombe, including garages, extensions, dormers and small commercial buildings. From targeted repairs to full replacements, our focus is on long-term waterproofing, correct drainage and clean detailing around edges, joints and outlets.

Flat Roof Installation

Flat roof installation is common on extensions and garage conversions throughout High Wycombe. A reliable installation depends on proper preparation, correct falls for drainage, and careful detailing at vulnerable points. We install flat roofing systems designed to cope with the local climate and daily use without early failure.
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Flat Roof Replacement

Flat roof replacement is often the right option when there are repeated leaks, widespread cracking, sagging or ageing materials that are no longer performing. We remove failed coverings, inspect the structure underneath, and install a replacement system suited to the building and how the roof is used.
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Flat roof replacement is often the right option when there are repeated leaks, widespread cracking, sagging or ageing materials that are no longer performing. We remove failed coverings, inspect the structure underneath, and install a replacement system suited to the building and how the roof is used.

Leaks on flat roofs are commonly caused by split membranes, failed seams, damaged edges or blocked outlets leading to standing water. Our repairs focus on identifying where water is getting in and why, then fixing the cause so the problem does not keep coming back.
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Flat Roof Inspections

A flat roof inspection is the best starting point if you’re unsure whether repair or replacement is needed. We assess the roof surface, seams, edges, outlets and key details, then explain our findings clearly so you can make an informed decision.
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Emergency Flat Roof Repairs

If water is entering the property, emergency flat roof repairs focus on making the roof watertight as quickly as possible to prevent further damage. We then advise on any permanent work needed to avoid repeat issues.
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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.

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
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Our Process
Inspection and advice

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

Clear quote and scheduling

You receive a clear quotation outlining the work involved. Once agreed, we schedule the job around access and weather conditions.

Installation, repair, and final checks

All work is completed with careful detailing, followed by final checks to ensure the roof is fully watertight.

[FAQ]

Frequently Asked Questions

How do I know if my flat roof needs repairing or replacing?
What causes flat roofs to leak?
How long does flat roofing work take?
Is standing water on a flat roof a problem?
Can flat roof repairs be carried out in winter?
What flat roofing system is best for my property in High Wycombe?
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