Flat Roofing Wembley
Need a flat roof install, replacement, or repair in Wembley HA9? We fit long-lasting systems for extensions, garages, dormers, and commercial roofs, with clear quotes and tidy workmanship.
Enquire now














Flat Roofing Services in Wembley
Our Services
About Our Flat Roofing Work
Wembley has a mix of modern blocks, busy high streets, and older homes with extensions, garages, and balconies, which means flat roofing is everywhere here. We focus on doing the basics properly, solid prep, correct drainage, neat detailing, and materials that match the job. The result is simple, a flat roof that stays watertight, looks right, and does not become your next headache.
1,000
Project Completed
97%
Customer Satisfaction
40+
Years of Experience
Flat Roof Systems We Fit in Wembley
Different buildings need different systems. We’ll talk you through the pros and cons, then fit the option that makes sense for your roof and budget.
EPDM Rubber Roofing Wembley
EPDM is a strong choice for extensions and garages because it’s durable, flexible, and low maintenance. It handles movement well, resists UV, and gives a clean finish when installed with proper edge trims and sealed upstands.
GRP Fibreglass Roofing Wembley
GRP is seamless and tough, making it ideal where you want a crisp finish, like balconies, walk-on areas, and roofs with lots of edge detailing. Done properly, it gives a rigid, watertight surface that holds up well over time.
Torch-On Felt Roofing Wembley
Modern torch-on felt is not the old cheap stuff people remember. It’s a multi-layer system that works well for many domestic flat roofs, especially where you want a proven approach at a sensible cost, with strong waterproofing when installed correctly.
Liquid Flat Roofing Wembley
Liquid systems are great for awkward roofs with penetrations, complex shapes, or lots of junctions. The coating forms a continuous waterproof layer and can be ideal for refurb projects where you need a seamless finish without heavy disruption.
Why Wembley Homeowners Choose Us?
Because you want it fixed properly, not “sorted” until the next downpour. We give honest advice, turn up when we say we will, keep the site tidy, and explain what you’re paying for. If a repair is enough, we’ll do the repair. If your roof is finished, we’ll tell you that too, with clear options.
1,000
Project Completed
97%
Customer Satisfaction
40+
Years of Experience
Trusted Roofing Services Across the
South East
Real feedback from customers who wanted a watertight roof and a hassle-free job.
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 surface, edges, outlets, and junctions, then tell you what’s wrong and what it will take to fix it.

You get a written quote that matches the scope, with a realistic start date and a plan for access, materials, and timings.
.png)
We complete the work, tidy up properly, then do final checks on drainage, seals, and finishes before we sign it off.
Frequently Asked Questions
It depends on the system and how well it was installed, but a properly fitted modern flat roof should last for many years. We’ll tell you what to expect based on your roof type and condition.
If the issue is localised and the rest of the roof is fine, repair makes sense. If there are recurring leaks, widespread cracking, or a failing deck, replacement usually saves money in the long run.
Common causes include ponding water from poor falls, blocked outlets, splits at seams, failed edge trims, and cracks around rooflights or upstands. The stain inside rarely points to the exact entry point.
Yes. If you are replacing the roof, it’s the best time to upgrade insulation and reduce heat loss, especially over extensions and converted spaces.
Most domestic jobs are straightforward. We plan access, protect surrounding areas, and keep noise and mess controlled. We’ll tell you upfront what the working days look like.
Yes. Workmanship is guaranteed, and where applicable, manufacturer-backed guarantees may apply depending on the system used. We’ll confirm this clearly in your quote.

.png)
.png)
.png)
.png)
