Flat Roofing Petersfield
Flat roof installation, replacement and repairs in Petersfield, with clear quotes, tidy workmanship, and fixes that actually last.
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Flat Roofing Services in Petersfield
Our Services
Flat Roofing Done Properly
Most flat roof problems come down to poor detailing, blocked outlets, or old coverings that have reached the end of their life. We focus on correct installation standards, clean joints, strong perimeter protection, and proper drainage so your flat roof performs through heavy rain, wind, and winter weather.
1,000
Project Completed
97%
Customer Satisfaction
40+
Years of Experience
Flat Roof Systems We Work With
We’ll recommend the best system based on your roof size, access, how the space is used, and your budget.
EPDM Rubber Roofing
A tough, flexible membrane that suits many residential flat roofs, especially where long-term weather resistance and low maintenance matter.
GRP Fibreglass Roofing
A seamless, durable option that’s ideal for smaller flat roofs and walk-on areas, giving a clean finish and strong waterproof protection.
Torch-On Felt Roofing
A proven multi-layer system when installed correctly, often chosen for garages and extensions where a reliable, cost-effective covering is needed.
Liquid Roofing Systems
Best for awkward details and refurbishment work, creating a continuous waterproof layer without the disruption of a full strip when suitable.
Why Petersfield Homeowners Choose Us?
You get honest advice, clear pricing, and a proper standard of work. We keep you informed, take care around your property, and focus on repairs that solve the issue rather than hiding it for a few months.
1,000
Project Completed
97%
Customer Satisfaction
40+
Years of Experience
Trusted Roofing Services Across the
South East
Reviews matter because flat roofing only looks “fine” until the next downpour, we’re proud to be the team people trust when it has to be right.
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 an inspection to identify the cause of the problem, then explain whether a repair or replacement is the smarter option.

You receive a clear written quote and a straightforward timeline, so you know what’s included before any work begins.
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We complete the work neatly, then check seams, outlets and edges to confirm the roof is watertight before we leave.
Frequently Asked Questions
Many repairs can be completed in a single visit, depending on access, weather, and the type of flat roof system.
Not always. If the leak is localised, a repair may be enough. If the covering is failing in multiple areas, replacement is usually the better long-term choice.
Blocked outlets, split seams, cracked coverings, lifted edges, and ponding water are the most common issues we see.
Yes, depending on the cause. Sometimes it’s a drainage issue, other times the roof needs re-forming or sections replacing to restore proper falls.
It depends on roof size, foot traffic, and budget. EPDM, GRP, felt and liquid systems all suit different situations, we’ll talk you through the right option.
Yes. If water is getting in, we can attend quickly to stop further damage and secure the roof while arranging any follow-up work.

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