Trusted Flat Roofing Specialists in Petersfield

Flat Roofing Petersfield

Flat roof installation, replacement and repairs in Petersfield, with clear quotes, tidy workmanship, and fixes that actually last.

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Flat Roofing Services in Petersfield

From small garage roofs to larger extensions, we install and repair flat roofs across GU31 and nearby areas.

Flat Roof Installation

We install flat roofs for extensions, dormers, garden rooms and garages, with proper falls, clean edge detailing, and reliable waterproofing from day one.
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Flat Roof Replacement

If your roof is failing, we can strip it back and rebuild it with a modern system that improves durability and, where needed, insulation and drainage.
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Flat Roof Repairs

We fix leaks, split seams, lifted edges and pooling water issues, identifying the cause first so you are not paying for repeat callouts.
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Flat Roof Inspections

Not sure if it needs a repair or a full replacement? We’ll inspect the roof, show you what we found, and explain the next step in plain English.
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Emergency Flat Roof Repairs

If water is getting in, we offer fast-response emergency repairs in Petersfield to reduce damage and make the roof safe until a permanent fix is completed.
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Flat Roofing Done Properly

Most flat roof problems come down to poor detailing, blocked outlets, or old coverings that have reached the end of their life. We focus on correct installation standards, clean joints, strong perimeter protection, and proper drainage so your flat roof performs through heavy rain, wind, and winter weather.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

Flat Roof Systems We Work With

We’ll recommend the best system based on your roof size, access, how the space is used, and your budget.

EPDM Rubber Roofing

A tough, flexible membrane that suits many residential flat roofs, especially where long-term weather resistance and low maintenance matter.

GRP Fibreglass Roofing

A seamless, durable option that’s ideal for smaller flat roofs and walk-on areas, giving a clean finish and strong waterproof protection.

Torch-On Felt Roofing

A proven multi-layer system when installed correctly, often chosen for garages and extensions where a reliable, cost-effective covering is needed.

Liquid Roofing Systems

Best for awkward details and refurbishment work, creating a continuous waterproof layer without the disruption of a full strip when suitable.

Why Petersfield Homeowners Choose Us?

You get honest advice, clear pricing, and a proper standard of work. We keep you informed, take care around your property, and focus on repairs that solve the issue rather than hiding it for a few months.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

Trusted Roofing Services Across the
South East

Reviews matter because flat roofing only looks “fine” until the next downpour, we’re proud to be the team people trust when it has to be right.

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 an inspection to identify the cause of the problem, then explain whether a repair or replacement is the smarter option.

Clear quote and scheduling

You receive a clear written quote and a straightforward timeline, so you know what’s included before any work begins.

Installation, repair, and final checks

We complete the work neatly, then check seams, outlets and edges to confirm the roof is watertight before we leave.

[FAQ]

Frequently Asked Questions

How long does a flat roof repair take?
Do I need a full replacement if my flat roof is leaking?
What are the most common causes of flat roof leaks?
Can you fix ponding water on a flat roof?
Which flat roofing system is best for my property?
Do you offer emergency flat roof repairs in Petersfield?
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