Flat Roofing in Didcot
If your flat roof is leaking, pooling water, or showing signs of age, we provide straightforward inspections, honest advice, and quality workmanship across Didcot and the wider OX11 area.
Enquire now














Didcot Flat Roof Repair and Installation
Our Services
Expert Flat Roofers in Didcot
Flat roofs fail for predictable reasons, poor drainage, weak detailing at edges, ageing materials, and rushed repairs that never fix the root problem. Our approach is simple, inspect the roof properly, explain what we’ve found in plain English, then carry out the work to a standard you can trust.
1,000
Project Completed
97%
Customer Satisfaction
40+
Years of Experience
Flat Roofing Options in Didcot
Different flat roof systems work better for different buildings. We’ll recommend the right option based on the roof size, access, budget, and how long you want it to last.
EPDM Rubber Roofing Didcot
EPDM is a strong, flexible rubber membrane that performs well in the UK climate. It’s a great choice for many residential and commercial flat roofs because it resists splitting, handles movement, and provides a clean, low-maintenance finish when installed correctly.
GRP Fibreglass Roofing Didcot
GRP creates a seamless surface that works especially well on garages, extensions, and smaller flat roofs where a rigid, watertight finish is needed. Preparation matters with GRP, so we focus on correct boarding, trims, and curing conditions to avoid future cracking.
Felt Flat Roofing Didcot
Modern felt systems are still a dependable option, especially where value and durability both matter. Installed in layers with proper detailing, felt roofing is a solid solution for many domestic flat roofs and can be repaired effectively when issues are caught early.
Industrial Flat Roofing in Didcot
We provide flat roofing for commercial and industrial properties in Didcot, including warehouses, offices, and larger roof areas. These roofs need practical planning, safe working standards, and materials suited to bigger spans and heavier demands. We install, repair, and maintain industrial flat roofs with minimal disruption and clear scheduling.
Why Water Pooling Happens on Flat Roofs?
A flat roof should never hold water for long. Pooling usually points to issues with the roof falls, the deck beneath, or blocked drainage points. Left alone, standing water speeds up wear and increases the chance of leaks. A proper inspection will tell you whether it’s a simple drainage fix, a repair, or a sign the roof structure needs attention.
1,000
Project Completed
97%
Customer Satisfaction
40+
Years of Experience
Trusted Roofing Services Across the
South East
People choose us because we explain things clearly, turn up when we say we will, and leave the job tidy
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 look at the roof so we can give advice based on facts, not guesses.

You’ll receive a clear quote, what’s included, what’s not, and when we can do the work.
.png)
We finish with final checks on joins, edges, outlets, and detailing, then leave the area clean and safe.
Frequently Asked Questions
Keep outlets clear, remove debris after storms, and check for lifting edges or surface blisters. A professional inspection every 1 to 2 years is sensible, and always after severe weather if you suspect damage.
Flat roofs can be cost-effective, quicker to install than many pitched roof builds, and ideal for extensions and garages. They also make it easier to add features like skylights, and they can be simpler to access for maintenance when built properly.
GRP can cost more upfront than felt, mainly due to the preparation and the materials used. The benefit is a seamless finish and strong water resistance when installed correctly, which can make it good value over time.
It depends on the system and how well it’s installed. As a rough guide, felt often lasts 10 to 20 years, while EPDM and GRP can last 20 to 40 years when installed and maintained properly.
Neither is “best” for every roof. GRP works well for smaller roofs and areas needing a seamless finish. Felt is often a solid option for value and repairability. The right choice depends on the roof structure, access, and budget.
Yes, as long as the roof structure can take the load and the mounting system is suitable. Flat roofs often need a frame to set the correct angle and protect the roof covering. It’s best to get the roof inspected first so you’re not fitting panels onto a roof that’s already close to failure.

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