Reliable flat roof repairs and replacements for Woodstock homes and businesses

Flat Roofing in Woodstock

If your flat roof is leaking, bubbling, or holding water after rain, we can help. We provide flat roof repairs, replacements, and new installations across Woodstock, with a focus on doing the job properly so you are not dealing with the same issue again in six months.

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Flat Roofing Services in Woodstock

Whether it’s a garage roof near the town centre, an extension roof that’s started to fail, or a commercial flat roof that needs urgent attention, we deliver practical solutions built for long-term weather protection.

Flat Roof Installation

We install new flat roofs across Woodstock for extensions, garages, dormers, porches, and outbuildings. The key to a flat roof that lasts is not just the material, it’s the preparation underneath it, the detailing around edges and joins, and making sure water has a clear route off the roof. We plan every job around that, then build it properly from the start.
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Flat Roof Replacement

If a flat roof has reached the point where repairs keep stacking up, replacement is usually the smarter option. We’ll assess the full roof build-up first, including the deck condition and any signs of trapped moisture. If replacement is needed, we remove what has failed, correct the weak points, and install a new system designed to stay watertight through harsh weather.
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Flat Roof Repairs

Most flat roof leaks in Woodstock come down to failed joints, splits in the covering, worn edges, or water pooling where the fall is wrong. Our repairs focus on fixing what caused the leak, not just patching the symptom. If it’s a targeted repair, we’ll do it cleanly and properly. If the roof is beyond sensible repair, we’ll tell you straight.
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Flat Roof Inspections

A quick inspection at the right time can save you a lot of money. We inspect flat roofs across Woodstock to spot early signs of failure such as blistering, cracking, lifting edges, weak outlets, or damp showing through ceilings. You’ll get clear advice on what needs doing now, what can wait, and what to keep an eye on.
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Emergency Flat Roof Repairs

If water is coming in, the priority is stopping the damage. We provide emergency flat roof repairs in Woodstock to make the roof safe and watertight, then follow up with the proper repair plan if more work is needed. The goal is simple, stop the leak, protect the structure, and get you back to normal quickly.
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Flat Roofing Work in Woodstock, Done Properly

Woodstock has a mix of older properties, newer extensions, and flat-roofed garages where poor historic installation can cause recurring issues. We see the same problems again and again, cracked coverings, weak joins, blocked drainage, and roofs that were never given the correct fall. Our approach is built around identifying why the roof failed, then putting in the right fix so it holds up long term.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

Flat Roof Systems We Install and Repair

Not every flat roofing material suits every roof. We’ll explain your options clearly, then recommend a system that fits the roof type, the level of foot traffic, and how long you want it to last.

EPDM Rubber Roofing

EPDM is a strong choice for many flat roofs in Woodstock because it handles temperature changes well and stays flexible over time. It’s particularly good for larger, simpler roof areas where you want a clean finish and low maintenance. Installed correctly, it offers excellent weather resistance and long-term reliability.

GRP Fibreglass Roofing

GRP works well where you need a tough, seamless finish, especially on roofs that see occasional foot traffic or have awkward detailing. The key is correct preparation and installation conditions. Done properly, GRP provides a solid surface that resists water ingress and stands up well over time.

Torch-On Felt Roofing

Torch-on felt remains a popular option for garages and extensions because it’s cost-effective and reliable when installed using modern multi-layer systems. The difference between a felt roof that lasts and one that fails early usually comes down to detailing at the edges and correct bonding between layers.

Liquid Roofing Systems

Liquid systems are useful for roofs with lots of penetrations, awkward shapes, or areas where seamless waterproofing is the best route. Preparation matters more than anything with liquid systems. If the base is not sound, the finish will not last. When used in the right scenario, it’s a very effective solution.

Why Flat Roof Problems Keep Coming Back?

A lot of flat roof issues aren’t caused by one big event, they’re caused by small weaknesses that are ignored or patched badly. Pooling water after rainfall, weak joins at edges, or repairs that were applied without fixing the underlying problem usually lead to repeat leaks. We focus on stopping the cycle, not feeding it with endless call-outs.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

Trusted Roofing Services Across the
South East

Homeowners choose us because we turn up, explain things clearly, and leave them with a roof they can trust

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 don’t quote blindly. We inspect the roof, explain what we’ve found in plain English, and recommend the right solution based on what the roof actually needs.

Clear quote and scheduling

You’ll get a clear quote with the work outlined properly, then we’ll agree a date that works for you. No vague pricing, no pressure, and no surprises.

Installation, repair, and final checks

Every job finishes with proper final checks, watertight detailing, and a tidy site. The goal is that you don’t need to think about your roof again once we’re done.

[FAQ]

Frequently Asked Questions

How do I know if my flat roof needs repair or replacement?
What are the most common causes of flat roof leaks?
How long does a flat roof repair take?
Is EPDM better than felt for a flat roof?
Can you repair a flat roof in winter?
Do you offer emergency flat roof repairs in Woodstock?
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