Trusted Flat Roofing in Gerrards Cross

Flat Roofing Gerrards Cross

Repairs, replacements and new flat roofs in Gerrards Cross, built with proper drainage, clean detailing, and no mess left behind.

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Flat Roofing Services in Gerrards Cross

We handle flat roofs on extensions, garages, dormers and outbuildings across SL9, from small leaks to full strip and rebuilds.

Flat Roof Installation

New flat roof planned and fitted properly, correct falls, secure trims, sealed joints, and drainage that actually works. Ideal for extensions, garages and dormers.
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Flat Roof Replacement

If the roof is past patching, we remove failed layers, repair the deck if needed, upgrade insulation where required, then install a modern system designed to stay watertight.
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Flat Roof Repairs

We fix leaks at seams, edges, outlets and rooflights, plus splits, blisters and lifting. You get a repair that targets the cause, not a quick cover-up.
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Flat Roof Inspections

Not sure if it’s repair or replacement? We inspect, show you the problem areas, and explain the options in plain English before you spend money.
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Emergency Flat Roof Repairs

Active leak? We prioritise urgent callouts in Gerrards Cross to stop water getting in, protect the area, and set out the next step for a permanent fix.
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Flat Roofs Done Properly

Most flat roof failures come down to weak detailing and poor drainage, not “bad luck”. We focus on the parts that usually get rushed, edges, upstands, outlets, and falls, because that’s where leaks start. The result is a roof that holds up through heavy rain and temperature swings, without constant patch jobs.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

Flat Roof Systems We Work With

We’ll recommend the system that suits your roof size, access, foot traffic and budget, then install it to a standard you can actually trust.

EPDM Rubber Roofing

A tough single-ply membrane that performs well on larger flat roofs. Flexible, UV resistant, and a strong option for long-term waterproofing.

GRP Fibreglass Roofing

A seamless, rigid finish that’s great for smaller roofs and details. Popular for dormers and balconies where clean edges matter.

Torch-On Felt Roofing

A reliable multi-layer system when installed properly. Often used for garages and extensions where you want proven performance at a sensible cost.

Liquid Roofing Systems

Ideal for awkward shapes or refurbishment work. Liquid systems create a continuous waterproof layer and can reduce disruption when the substrate is sound.

Why Gerrards Cross Homeowners Call Us?

Clear quotes, straight answers, and work done properly the first time. We turn up when we say we will, keep the site tidy, and focus on fixes that last, not repeat callouts.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

Trusted Roofing Services Across the
South East

Homeowners usually mention the same things in reviews, turning up on time, keeping things clean, and stopping the leak 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
REVIEWS
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Our Process
Inspection and advice

We inspect the roof, identify the failure point, and tell you what needs doing, and what doesn’t.

Clear quote and scheduling

You get a clear written quote and a date, no vague pricing, no surprises.

Installation, repair, and final checks

We complete the work neatly, then check edges, seams and outlets to confirm it’s sealed and draining as it should.

[FAQ]

Frequently Asked Questions

How long does a flat roof repair take?
Do I need to replace my whole flat roof if it’s leaking?
What are the most common causes of flat roof leaks?
Can you fix pooling water on a flat roof?
Which flat roofing material is best for my property?
Do you offer emergency flat roof repairs in Gerrards Cross?
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