Trusted Flat Roofing in Basingstoke

Flat Roofing Basingstoke

Need a flat roof repair, replacement, or a brand new install in Basingstoke? We deliver clean, watertight finishes using proven systems like felt, EPDM and GRP, with proper inspections and clear pricing.

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Flat Roofing Services in Basingstoke

From small garage roofs to full extensions and commercial units, we handle the full job, inspection, materials, installation, and aftercare.

Flat Roof Installation

New flat roofs installed for extensions, garages, dormers and commercial buildings. We build the correct falls, detailing and drainage so it lasts, not just looks good on day one.
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Flat Roof Replacement

If your existing roof is beyond repair, we strip it back properly, fix any weak decking, then install a new system with neat trims, outlets and clean edges.
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Flat Roof Repairs

Leaks, splits, lifting edges, pooling water, we diagnose the cause and repair it properly. You get straight answers on whether a repair is enough, or if replacement is the smarter option.
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Flat Roof Inspections

We carry out thorough flat roof checks, including edges, seams, outlets and roof penetrations. If there’s a problem, we show you what we found and talk you through the options.
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Emergency Flat Roof Repairs

If water is getting in, speed matters. We prioritise urgent call-outs in Basingstoke and make the roof safe and watertight, then quote for any follow-up work if needed.
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Local Flat Roofers You Can Rely On

Alliance Roofing & Building provides flat roofing across Basingstoke and nearby areas, with a focus on doing the basics properly, preparation, correct falls, tidy detailing, and workmanship you can trust. We work on homes, extensions, garages and commercial roofs, and we keep you informed throughout so there are no surprises.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

Flat Roofing Systems We Install

We recommend the right system based on the roof size, usage, access, budget and expected lifespan, not whatever is easiest to sell.

EPDM Rubber Roofing

EPDM is a tough, flexible membrane that handles UK weather well and needs minimal upkeep. It’s a solid option for extensions and garages where you want a clean finish and long-term reliability.

GRP Fibreglass Roofing

GRP creates a seamless, watertight surface that suits smaller flat roofs like garages and dormers. Done properly, it delivers a sharp finish with strong resistance to cracking and standing water.

Torch-On Felt Roofing

Modern felt systems are far better than the old stuff people remember. With the right layering and detailing, torch-on felt remains a dependable, cost-effective choice for many flat roofs.

Liquid Flat Roofing Systems

Liquid systems are ideal when a roof has awkward shapes, lots of details, or needs an overlay solution. They create a fully bonded waterproof layer with clean finishes around edges and penetrations.

Why Basingstoke Homeowners Choose Us?

Because you want the job done once, and done right. We keep it simple, proper inspection, clear advice, tidy workmanship, and a finish that holds up through winter, not just the first rainfall.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

Trusted Roofing Services Across the
South East

Real feedback matters. Our work is judged by how it performs months and years later, and that’s exactly what our customers talk about.

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 properly and explain what’s needed, what can be repaired, and what’s worth replacing.

Clear quote and scheduling

You get a clear quote and a sensible timeframe, with everything explained in plain English.

Installation, repair, and final checks

We complete the work carefully, keep the site tidy, and check the details before signing it off.

[FAQ]

Frequently Asked Questions

How do I know if my flat roof needs repair or replacement?
What is the best flat roofing material for a house extension?
How long does a flat roof installation take?
Can you fix a flat roof leak quickly?
Do flat roofs need regular maintenance?
Will you provide a written quote?
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