Trusted flat roofing across Oxfordshire, clear inspections, proper repairs, and replacements built to last

Flat Roofing in Oxfordshire

If your flat roof is leaking, holding water, or showing signs of wear, you need a fix that deals with the cause, not a patch that fails again. We provide flat roof inspections, repairs, replacements and new installations across Oxfordshire for homeowners and property managers, with straightforward advice and tidy workmanship from start to finish.

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Our Flat Roofing Services in Oxfordshire

We carry out flat roofing work on extensions, garages, dormers, bay roofs and light commercial buildings across Oxfordshire. Whether you need a small repair or a full replacement, we focus on long-term waterproofing, correct drainage, and clean detailing around edges, seams and upstands.

Flat Roof Installation

Flat roof installation is common on new extensions and garage projects across Oxfordshire. Done properly, a flat roof should be watertight, well-drained, and suitable for the building. We install flat roofing systems with correct preparation and attention to the details that prevent early failure, especially falls, outlets, edges and joins.
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Flat Roof Replacement

Flat roof replacement is often the best option when the roof has repeated leaks, widespread cracking, sagging, or an ageing covering that is failing across large areas. We remove the old system, inspect what’s underneath, and install a replacement designed to suit the roof’s use and exposure, so you’re not stuck in a cycle of constant repairs.
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Flat Roof Repairs

Flat roof leaks are commonly caused by failed seams, cracks in the covering, damage around roof edges, or blocked outlets that lead to standing water. We take the time to find where water is getting in and why, then complete repairs that deal with the root cause. Early repairs can also prevent water ingress affecting insulation, joists and internal ceilings.
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Flat Roof Inspections

A flat roof inspection is the right starting point if you’re unsure whether you need a repair or replacement. We check the roof surface, seams, edges, outlets, and vulnerable details where leaks typically begin. You’ll get a clear explanation of what we’ve found and what options make sense, without pressure or vague recommendations.
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Emergency Flat Roof Repairs

If water is coming in suddenly, the priority is making the roof watertight and protecting the property. Emergency flat roof repairs focus on stopping the ingress and reducing further damage, then advising on any follow-up work needed to stop the issue returning.
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About Our Flat Roofing Work in Oxfordshire

Across Oxfordshire, we often work on flat roofs for extensions, garages and older properties where original felt systems are now reaching the end of their life. We also see flat roofs fail early where drainage was never formed correctly, leading to ponding after heavy rain, or where edges and upstands were rushed and start to lift over time. Many Oxfordshire flat roof problems come down to the same issues, ageing coverings, weak detailing, and water not being directed away properly. Our work focuses on fixing those weak points properly so the roof performs as it should.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

Flat Roofing Systems We Work With

The best flat roof system depends on the roof’s size, access, exposure, and whether it needs to handle regular foot traffic. We work with a range of flat roofing materials and will recommend the most suitable option for your property based on a proper inspection.

EPDM Rubber Roofing

EPDM is a durable rubber membrane that works well on many residential flat roofs such as extensions and garages. It handles movement without cracking and performs reliably in UK conditions when installed with correct preparation and secure edge detailing.

GRP Fibreglass Roofing

GRP fibreglass roofing creates a seamless, hard-wearing finish that suits many smaller flat roofs and areas where a tougher surface is useful. Applied correctly, GRP forms a strong waterproof layer and provides a clean, tidy finish around edges and detailing.

Torch-On Felt Roofing

Modern torch-on felt is a practical option for certain flat roofs when installed correctly with proper layering and clean detailing. The base preparation and edge finishing matter a lot, and done right, felt systems can be dependable and cost-effective.

Liquid Roofing Systems

Liquid roofing systems can be suitable where the roof has complex detailing or where an overlay approach is appropriate. They form a seamless waterproof coating and can be effective when installed with correct primers, reinforcement and curing conditions.

Why Homeowners Across Oxfordshire Choose Alliance Roofing?

People choose Alliance Roofing because we’re straight with them. We inspect the roof properly, explain what’s wrong in plain terms, and give realistic options based on the condition of the roof, not guesswork. We focus on the details that stop repeat leaks, drainage, seams, edges and upstands, and we keep the site tidy and respectful while the work is being carried out.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

Trusted Roofing Services Across the
South East

Known across Oxfordshire for reliable workmanship and clear, practical advice

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’s condition, identify the cause of any issues, and talk you through the options clearly so you can make a sensible decision.

Clear quote and scheduling

We provide a straightforward quotation explaining what’s included. Once agreed, we book in the work around what’s practical for you and the job.

Installation, repair, and final checks

We complete the work with careful detailing and watertight finishes, then carry out final checks so you’re not left hoping it’s been done properly.

[FAQ]

Frequently Asked Questions

How do I know if my flat roof needs repairing or replacing?
What are the most common causes of flat roof leaks?
How long does flat roofing work usually take?
Is ponding water on a flat roof a problem?
Can you repair a flat roof in winter?
What flat roofing system is best for my property?
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