Flat Roofing Amersham
Need a new flat roof, a replacement, or a fast repair in Amersham? We install long-lasting flat roofing systems, and we keep it simple, clear pricing, tidy work, and no nonsense.
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Flat Roofing Services in Amersham
Our Services
About Our Flat Roofing in Amersham
We carry out flat roofing work across Amersham and the wider HP6 area, for homeowners, landlords, and local businesses. Our focus is straightforward, install the right system, do clean work, and leave you with a roof you do not have to worry about every time it rains.
1,000
Project Completed
97%
Customer Satisfaction
40+
Years of Experience
Flat Roof Types We Install
Different roofs suit different buildings. Here are the main flat roofing systems we install in Amersham, and when each one makes sense.
EPDM Rubber Roofing
EPDM is a tough rubber membrane with fewer joins and excellent weather resistance. It’s a strong option for extensions and garages in Amersham when you want a clean finish and long service life.
GRP Fibreglass Roofing
GRP creates a seamless, rigid surface that looks smart and performs well when installed correctly. It’s ideal for flat roofs where you want a crisp edge detail and a solid, durable finish.
Torch-on Felt Roofing
Torch-on felt is a reliable, proven system when it’s fitted properly with the right layers and detailing. It suits many flat roofs in Amersham, and gives strong waterproofing at a sensible price point.
Liquid Roofing Systems
Liquid systems work well for tricky roofs with lots of details, awkward edges, or hard-to-access areas. The coating cures into a seamless waterproof layer, making it a good option for certain repair and overlay jobs.
Why Amersham Homeowners Choose Us
You want a flat roofer who turns up, explains things clearly, and does the job right. We keep sites tidy, keep you updated, and we don’t mess you around with vague pricing or half-fixes.
1,000
Project Completed
97%
Customer Satisfaction
40+
Years of Experience
Trusted Roofing Services Across the
South East
We’re proud of the feedback we get, because it reflects how we work, clear communication, tidy installs, and flat roofs that hold up in real weather.
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 check the roof properly, not just the obvious patch that’s leaking. Then we explain what’s going on in plain English, and tell you the best fix for your Amersham property.

You get a clear written quote with the work explained, no vague line items. Once you’re happy, we book you in with realistic timings and keep you updated.
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We complete the work cleanly and safely, then do final checks on key weak points like edges, outlets, and joins. We leave the area tidy and make sure you’re confident in what’s been done.
Frequently Asked Questions
It depends on the system and how well it’s installed. As a rough guide, torch-on felt often lasts well over a decade, EPDM can last longer, and GRP is also long-lasting when detailed correctly. We can inspect your roof and give a realistic view based on its condition.
Yes, in many cases. If the roof structure is sound and the issue is localised, a proper repair can be the right call. If the roof has widespread failure, repeated leaks, or poor detailing, a replacement is usually the smarter option long-term.
Common signs include water pooling, bubbling or lifting, cracks, damp patches indoors, and leaks around edges or outlets. If you’re seeing any of these in Amersham, it’s worth getting it checked before the damage spreads.
No. Flat roofs leak when they’re badly installed, poorly detailed, or left too long without maintenance. A correctly installed system with proper drainage and clean joins should stay watertight.
If it’s urgent and water is getting in, we prioritise emergency callouts where we can. The goal is to stop the ingress quickly, then follow up with a proper repair or replacement plan.
It depends on the roof shape, access, budget, and what finish you want. EPDM works well for clean, simple roofs, torch-on felt is a proven all-rounder, and GRP suits roofs where you want a crisp, hard finish. We’ll recommend what actually fits your roof, not what’s easiest to sell.

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