Flat Roofing Alton
Flat roof installation, replacement and flat roof repairs in Alton, GU34, for extensions, garages, dormers and residential properties across Hampshire.
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Flat Roofing Services in Alton
Our Services
About Our Flat Roofing
Flat roofs are common across Alton, especially on extensions, garages, dormers and outbuildings. The difference between a flat roof that lasts and one that fails early usually comes down to drainage, edge finishing, and how well the roof is sealed around joins and upstands. We focus on the fundamentals, then finish cleanly so the roof performs properly and looks right on the property.
1,000
Project Completed
97%
Customer Satisfaction
40+
Years of Experience
Flat Roofing Systems We Offer
We offer several flat roofing systems so you can choose the right balance of lifespan, appearance and budget for your Alton property.
EPDM Rubber Roofing
EPDM rubber roofing is a strong choice for larger flat roof areas because it stays flexible and handles temperature changes well. It’s ideal for Alton extensions and garages where you want a long-lasting, low-maintenance roof with excellent waterproof protection.
GRP Fibreglass Roofing
GRP fibreglass roofing creates a seamless, smart finish that works especially well on smaller roofs. It’s a popular option for dormers, porches and compact extensions in Alton where neat detailing and durability matter.
Torch-On Felt Roofing
Torch-on felt is still a solid option when installed properly using a multi-layer system. We pay attention to common weak points like edges, corners and outlets, because that’s where most felt roofs start to fail when the work is rushed.
Liquid Roofing Systems
Liquid roofing systems are useful for awkward shapes, complex details, and roof areas with lots of penetrations. Applied as a seamless coating, they create a watertight surface without relying on long runs of joins.
Why Alton Homeowners Choose Us
Alton homeowners don’t want vague promises, they want straight answers and work that holds up. People choose us because we explain what’s wrong in plain English, provide a clear quote, and do the job properly, tidy site, clean finish, and no disappearing after payment.
1,000
Project Completed
97%
Customer Satisfaction
40+
Years of Experience
Trusted Roofing Services Across the
South East
Our reviews usually mention the same things, honest advice, clear communication, and workmanship that looks good and stays watertight.
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 start with a proper inspection of the flat roof, including edges, joints, outlets and flashings, then explain what’s causing the problem and what the realistic options are.

You receive a clear written quote and a sensible timeline. If the roof needs urgent attention, we prioritise the job and keep you updated.
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After completing the work, we check seams, edges, outlets and upstands, then walk you through what’s been done and what to watch for going forward.
Frequently Asked Questions
If the issue is localised and the roof is otherwise in good condition, a repair can be the right move. If there are repeated leaks, widespread cracking, lifting edges, or soft decking, replacement is usually the safer long-term choice.
It depends on the roof size and layout. EPDM works well on larger roofs, GRP suits smaller roofs, felt can be cost-effective, and liquid systems help with awkward shapes. We recommend the right option after inspecting your roof.
Many garage and extension flat roofs can be completed in one to two days. Larger roofs, or jobs needing decking repairs and insulation upgrades, can take longer.
Yes. If the deck is damp, soft, or damaged, it needs to be repaired or replaced first. Installing over a bad deck is one of the fastest ways to shorten the life of a new flat roof.
Yes. If it’s safe to access, we can carry out urgent repairs or temporary weatherproofing to stop water getting in, then return to complete the permanent fix when conditions allow proper sealing.
Yes. We provide free quotes and clear advice, so you can make a decision without pressure.

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