Your Trusted Local Roofer In Windsor

Expert Roofers In Windsor

Repairs, replacements and flat roofing for Windsor homes and landlords. Free surveys, clear quotes and fully insured workmanship.

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Our Roofing Services

Straightforward advice and long-lasting results for every type of roof.

New Roof Installations

From strip off to final ridge, we install complete roof systems that meet current standards. Old coverings are removed, breathable membranes and battens renewed, and tiles or slates laid clean and true. We finish with neat verges and tidy leadwork for a roof that looks smart and performs for years.
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Pitched Roofing

Re-tiling and slate replacement, structural timber checks, new felt and battens where required. We set out courses for even lines, fix hips and valleys correctly, and leave you with a weather-tight pitched roof suited to Windsor’s conditions.
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Flat Roofs

Installation and repair in GRP fibreglass, felt and EPDM rubber. Outlets and perimeters are detailed to prevent ponding, so your flat roof stays watertight on dormers, garages and extensions across Windsor and SL4.
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New Roof Installations

Leaks, slipped tiles, storm damage and failed flashing fixed the right way. We diagnose the root cause, repair the defect and check nearby details to stop the issue returning.
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Emergency Roofing

Fast callouts for sudden leaks and wind damage. We make safe, stop water ingress and schedule a permanent fix with a clear quotation.
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uPVC Fascias, Soffits and Cladding

Low-maintenance roofline upgrades that protect exposed timbers and improve ventilation. Choose modern colours and woodgrains to refresh the look of your Windsor property.
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Guttering

Repairs and full replacement in uPVC or aluminium. Correct falls and sealed joints keep water moving away from walls and foundations. We also add guards where leaf fall is a problem.
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Chimney Repairs and Repointing

Repointing, new lead flashings, aprons and back gutters formed to best practice. We can cap, cowl or dismantle unsafe stacks, then make good the surrounding roof area.
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Spray Foam Removal

Careful removal of legacy foam to restore ventilation and reveal the true condition of rafters and felt. We then specify the correct breathable membrane and insulation so the roof performs as it should.
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Moss Removal By Hand

Gentle, manual clearing that protects tiles and avoids pressure damage. We clear gutters and dispose of waste, then advise on prevention and maintenance.
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Roofing Specialists Windsor

Keeping a roof sound is simpler with clear advice and tidy workmanship. We start with a free survey, explain your options and give a fixed, written quote. Whether you need a small repair in central Windsor or a full re-roof in the surrounding villages, you get reliable scheduling and a finish that lasts.

Why Homeowners Choose Us

You will deal with an experienced, polite crew that treats your property with care. We use proven materials, keep you informed at every stage and back our work with guarantees and full public liability insurance. Most of our Windsor roofing comes from referrals, which says a lot about how we work.

1,000

+

Project Completed

97%

Customer Satisfaction

40+

Years of Experience

[Latest Projects]

Recent Roofing Projects Across the South East

[01]

Flat Roof Installation - Harrow

We completed a durable and weatherproof flat roof installation for a residential property in Surrey, using high-quality GRP fibreglass roofing to ensure longevity and low maintenance.
Location:
Harrow
Scope:
Complete installation of a new roof
Project Thumbnail
[02]

Spray Foam Removal & New Roof Installation – Walters Ash

We successfully removed outdated spray foam insulation and installed a new pitched roof for a property in Walters Ash, ensuring proper ventilation, improved structural integrity, and long-term durability.
Location:
Walters ash
Scope:
Removal and Installation
Project Thumbnail
[03]

Moss Removal – Beaconsfield

We carried out professional moss removal by hand on a residential property in Beaconsfield, restoring the roof’s appearance and preventing long-term damage caused by moss growth.
Location:
Beaconsfield
Scope:
Safe and effective manual moss removal
Project Thumbnail

What Customers Say

Clients mention clear communication, fair pricing and roofs that hold up well in tough weather. Read recent reviews from Windsor and nearby areas to see how we handle everything from emergency leak fixes to complete replacements.

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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[The Process That Sets Us Apart]
How We Work
Step 1:

Survey and Plan. We inspect the roof, photograph issues, agree materials and provide a fixed quote with timelines.

Step 2:

Carry Out The Works. Old coverings are removed where required, details are repaired and new materials installed to manufacturer standards.

Step 3:

Sign-off and Clean. We finish flashings and trims, tidy the site, walk you through the work and issue your guarantee.

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[FAQ]

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How do I know if I need a repair or a full replacement?
Can you work during bad weather?
How long does a new roof take in Windsor?
Will you match my existing tiles or slates?
Do you offer guarantees?
Can you remove old spray foam safely?
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Alliance Roofing & Building Phone Icon – Contact us for expert roofing services across Buckinghamshire, Berkshire, and Hertfordshire.Alliance Roofing Work Van – Serving Buckinghamshire, Berkshire, Hertfordshire, and Surrounding AreasAlliance Roofing Work Van – Serving Buckinghamshire, Berkshire, Hertfordshire, and Surrounding Areas
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