Flat Roofing in Hertfordshire
We provide flat roofing services across Hertfordshire for homeowners and property managers dealing with ageing flat roofs, leaks, or new extensions. From inspections and repairs to full flat roof replacements, our work focuses on long-term protection, proper drainage, and systems that suit the property rather than quick fixes that fail a few years later.
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Our Flat Roofing Services in Hertfordshire
Our Services
About Our Flat Roofing Work in Hertfordshire
Much of our flat roofing work in Hertfordshire involves residential extensions, garage roofs, and older flat roofs that were originally installed with felt systems. Over time, these roofs often suffer from poor drainage, ageing materials, and movement-related cracks. In many areas, flat roofs fail prematurely when falls are not formed correctly or outlets are poorly positioned. Our approach focuses on addressing these common local issues properly, ensuring water is directed away from the roof and the system installed suits the property and exposure conditions.
1,000
Project Completed
97%
Customer Satisfaction
40+
Years of Experience
Flat Roofing Systems We Work With
Different flat roofing systems suit different buildings, budgets, and levels of use. We work with a range of flat roof materials and will advise on the most appropriate option based on the condition and purpose of the roof.
EPDM Rubber Roofing
EPDM rubber roofing is a popular option for residential flat roofs due to its flexibility and resistance to weathering. It performs well on garages and extensions and is known for its durability when installed correctly. EPDM systems are low maintenance and provide reliable long-term waterproofing.
GRP Fibreglass Roofing
GRP fibreglass roofing creates a seamless, joint-free surface that is highly durable. It is well suited to flat roofs that require a hard-wearing finish and is often chosen for balconies and walk-on areas. When installed properly, GRP offers excellent resistance to water ingress and surface damage.
Torch-On Felt Roofing
Modern torch-on felt roofing is a significant improvement on older felt systems. When layered and installed correctly, it provides dependable waterproofing and is suitable for many flat roof applications. It remains a cost-effective option for certain properties when applied to a well-prepared base.
Liquid Roofing Systems
Liquid roofing systems are often used where traditional replacement is not practical. They can be applied over existing surfaces, creating a seamless waterproof layer. This option can reduce disruption and is particularly useful for complex roof shapes or detailing.
Why Homeowners Across Hertfordshire Choose Alliance Roofing?
Homeowners choose Alliance Roofing because we focus on doing flat roofing work properly rather than rushing jobs through. We provide clear inspections, honest advice, and straightforward quotations so there are no surprises. Our work is planned to prevent common flat roof failures and backed by workmanship guarantees for added peace of mind.
1,000
Project Completed
97%
Customer Satisfaction
40+
Years of Experience
Trusted Roofing Services Across the
South East
Trusted by homeowners across Hertfordshire for reliable flat roofing work
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.
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
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.
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.
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.
Replacement of flat roof - Mitchell and his team are smart, communicative, skilled, friendly, helpful, trustworthy and reliable. I would highly recommend their roofing services.
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
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.
Fixed the roof, including all the felting and repaired the chimney. - Good communication throughout. Good work. Very happy with the service.
Roof repair - Great, really friendly and nice team
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.
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.
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.
Leak in the roof- Very polite and professional. Job was completed professionally at a very good price. Would highly recommend
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.
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.
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
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.
Fixed the roof, including all the felting and repaired the chimney. - Good communication throughout. Good work. Very happy with the service.
Roof repair - Great, really friendly and nice team
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.

Every job starts with a proper inspection to understand the condition of the roof and the cause of any issues. We explain the options clearly so you can make an informed decision.

You’ll receive a detailed quotation outlining the work involved and realistic timescales. Once agreed, we schedule the work at a time that suits you.
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All work is carried out with care and attention to detail. Once complete, final checks are carried out to ensure the roof is watertight and finished correctly.
Frequently Asked Questions
The lifespan of a flat roof depends on the material used and the quality of installation. Modern systems such as EPDM and GRP can last several decades when installed and maintained correctly.
In many cases, yes. If the structure is sound and the damage is localised, repairs can extend the life of the roof. A proper inspection will determine the best option.
Leaks are commonly caused by failed joints, cracked membranes, blocked drainage, or poor installation. Addressing the root cause is essential for a lasting repair.
Timescales vary depending on the size of the roof and the work required. Minor repairs may take a day, while full replacements typically take several days.
Yes. Our flat roofing work is backed by workmanship guarantees, and manufacturer warranties may apply depending on the system installed.
Flat roofs are commonly used on extensions, garages, and dormers. When designed and installed correctly, they provide reliable performance and are easy to maintain.

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