Trusted flat roof repairs and installations across Didcot, OX11

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.

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Didcot Flat Roof Repair and Installation

We work on garages, extensions, dormers, bay roofs and commercial units, handling everything from small repairs to full flat roof replacements, with clear quotes and tidy finishes.

Flat Roof Installation

A proper flat roof install is about the details, not just the covering. We check the structure, form the correct falls for drainage, and install a system that suits the roof’s use, whether it needs to handle foot traffic, skylights, or regular weather exposure.
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Flat Roof Replacement

If the roof has repeated leaks, soft spots, or old patchwork repairs, replacement is often the smarter option. We remove the failing system, inspect the deck, fix underlying issues, and install a new flat roof designed for long-term performance, not quick fixes.
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Flat Roof Repairs

Flat roof repairs in Didcot commonly involve split membranes, damaged felt seams, lifted edges, blocked outlets, or weak flashing around joins. We identify what’s actually causing the issue, then repair it properly so you’re not calling someone out again in six months.
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Flat Roof Inspections

If you’ve noticed staining on ceilings, damp smells, bubbling on the surface, or standing water after rain, it’s time for an inspection. We carry out flat roof inspections in Didcot to catch problems early and help you avoid bigger repair costs later.
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Emergency Flat Roof Repairs in Didcot

When water is getting into your property, speed matters. We provide emergency flat roof repairs in Didcot to stop active leaks, protect the interior, and advise on the right permanent repair once the roof is secure.
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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.

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
REVIEWS
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Our Process
Inspection and advice

We start with a proper look at the roof so we can give advice based on facts, not guesses.

Clear quote and scheduling

You’ll receive a clear quote, what’s included, what’s not, and when we can do the work.

Installation, repair, and final checks

We finish with final checks on joins, edges, outlets, and detailing, then leave the area clean and safe.

[FAQ]

Frequently Asked Questions

How do I maintain a felt flat roof, and how often should it be inspected?
What are the advantages of having a flat roof?
Is a fibreglass flat roof more expensive?
How long do flat roofs typically last?
Is GRP fibreglass roofing better than felt roofing?
Can I install solar panels on a flat roof?
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