Trusted flat roofing specialists serving Bicester and OX26

Flat Roofing in Bicester

We provide flat roof repairs, replacements and new installations across Bicester, OX26, focusing on long-term performance, proper drainage, and workmanship that stands up to real weather.

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Flat Roof Repair and Installation in Bicester

From small garage roofs to large extensions and commercial buildings, we handle flat roofing work properly, starting with a thorough inspection and clear advice before any work begins.

Flat Roof Installation

A flat roof installation only performs well if the structure, falls, and detailing are right. We design each installation to manage water correctly, reduce future maintenance, and suit the specific building rather than using a one-size-fits-all approach.
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Flat Roof Replacement

When a flat roof has reached the end of its lifespan, replacement is often more cost-effective than repeated repairs. We remove failing materials, check the deck and insulation, and install a new system built for long-term reliability.
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Flat Roof Repairs

Leaks on flat roofs in Bicester often come from split membranes, failed joints, or worn edge details. We trace the source of the problem accurately and repair it properly, avoiding short-term fixes that allow water back in.
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Flat Roof Inspections

Flat roofs do not always show problems immediately. Our inspections check drainage, surface condition, joins, and vulnerable areas so issues can be dealt with before they cause internal damage.
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Emergency Flat Roof Repairs in Bicester

If water is entering the property, quick action matters. We carry out emergency flat roof repairs in Bicester to stop further damage and make the roof safe before recommending any permanent repair work.
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Flat Roofing Built for Bicester Properties

Flat roofs fail when corners are cut. Poor falls, rushed detailing, and unsuitable materials lead to repeat problems. Our approach is practical and straightforward, assess the roof properly, explain the options clearly, and carry out work that lasts rather than work that needs revisiting.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

Flat Roofing Systems We Install

Different flat roof systems suit different buildings. We help you choose based on roof size, access, budget, and how long you expect the roof to perform reliably.

EPDM Rubber Roofing

EPDM rubber roofing is a popular option for flat roofs due to its flexibility and resistance to cracking. When installed correctly, it handles temperature changes well and suits both residential and commercial buildings.

GRP Fibreglass Roofing

GRP fibreglass roofing creates a seamless, rigid finish that works well on garages, dormers, and smaller flat roofs. Correct preparation and curing are essential, which is why experience matters with this system.

Torch-On Felt Roofing

Modern torch-on felt systems remain a reliable and cost-effective choice when installed in proper layers with secure edge detailing. Felt roofs are also repairable when issues are caught early.

Liquid Roofing Systems

Liquid-applied systems are useful where roof shapes are complex or penetrations make sheet systems impractical. Once cured, they form a continuous waterproof surface that protects existing structures.

Common Causes of Flat Roof Problems in Bicester

Most flat roof issues come from standing water, failed edges, or poor detailing around rooflights and outlets. Identifying these early and fixing them correctly prevents internal damage and repeated repair costs.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

Trusted Roofing Services Across the
South East

Honest advice, clear communication, and flat roofing work done properly

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

Every job starts with a proper inspection and straightforward advice on the best way forward.

Clear quote and scheduling

You receive a clear written quote and realistic timescales before any work begins.

Installation, repair, and final checks

We complete the work carefully, check all vulnerable areas, and leave the site clean and safe.

[FAQ]

Frequently Asked Questions

How long should a flat roof last?
Can flat roofs be repaired in winter?
Why does my flat roof keep leaking after repairs?
Is replacing a flat roof disruptive?
Do flat roofs need regular maintenance?
Do you offer emergency flat roof repairs in Bicester?
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