Roofing
Flat roofing and flat roof replacement
New and replacement flat roofs on extensions, dormers and outbuildings, closing off a common route for leaks and damp.
Why diagnosis matters
Treat the cause, then repair the damage
Flat roofs fail at laps, upstands and outlets long before they look obviously worn. We renew flat roof coverings on extensions, dormers and bays with modern membrane systems and correct the detailing that lets water track inside.
Complimentary survey
Book Your Complimentary Survey
Over 35 years of independent expertise. Written findings included. No sales pressure. No obligation.
Book your complimentary surveyTechnical review
Dan, Director / Surveyor
Last reviewed: July 2026. Advice is general until the property, access and visible evidence have been assessed.
Guarantee & aftercare
Written guarantee terms are matched to qualifying work, with inclusions, exclusions and aftercare explained before acceptance.
What we consider
Possible causes and lookalikes
Aged felt or worn membrane
Poor falls and standing water
Failed junctions with walls and parapets
Blocked or undersized outlets
Inspection method
A clear work sequence
Step 1
Assess the deck, falls and detailing
Step 2
Specify a suitable membrane system and upstands
Step 3
Renew the covering, trims and outlets
Step 4
Check discharge and watertightness on completion
Scope boundaries
Honest about what the work does—and does not—cover
We install and replace flat roof coverings, upstands, trims and outlets in-house. Structural deck replacement, new steelwork and building-control matters are referred where they fall outside our direct scope.
Complimentary specialist survey
Your Complimentary Specialist Survey
Backed by over 35 years of independent damp and timber expertise.
We believe in diagnosis before treatment. That's why we offer every homeowner and property manager in Dorset, Hampshire and Wiltshire a complimentary specialist survey — carried out by an experienced specialist, not a salesperson.
Over 400 combined reviews across Google and Checkatrade. Over 35 years protecting Dorset homes.
Common questions
About flat roofing and flat roof replacement
What flat roof systems do you use?+
We select a system to suit the roof — commonly single-ply, GRP or high-performance felt — based on size, falls, foot traffic and detailing rather than a one-size-fits-all product.
Can you improve the falls so water drains?+
In many cases falls can be improved with tapered insulation or deck adjustment so water reaches the outlets. We confirm what is achievable after inspecting the existing build-up.
How long does a flat roof last?+
A well-installed modern membrane can last many years, but life depends on the system, detailing and maintenance. We explain realistic expectations rather than quoting a single guaranteed figure.
Is the specialist survey really free?+
Yes — completely. We offer every homeowner and property manager across Dorset, Hampshire and Wiltshire a complimentary specialist survey at no charge. This includes an on-site inspection, written findings, a clear scope of any recommended work, and an honest referral if the problem falls outside what we do. You pay nothing for the survey. You only pay if you commission the remedial work, and you are under no obligation to do so. The reason we do this is straightforward: we believe in diagnosing the problem before recommending a treatment. A proper inspection takes time, and we'd rather invest that time up front than quote a solution before we've understood the cause.
Not sure if this is your problem?
That's exactly what the survey is for. Book your complimentary specialist survey and one of our experienced team will identify the cause on-site, consider the alternatives, and give you written findings — at no charge and with no obligation.
Related services
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Recent work
Photographed on our own projects
A selection of real jobs from this service, photographed on site across Dorset, Hampshire and Wiltshire.
Reviewed by local homeowners
Trusted across Dorset, Hampshire and Wiltshire
Independent feedback from customers on Google and Checkatrade — alongside over 35 years of damp proofing and plastering experience.
Next step
Claim your complimentary survey before choosing a treatment
Tell us what you can see, when it changes and where the property is. Photographs can help us triage the next step.