
Flat Roofing in Thornburyfrom our Crick base.
GRP and liquid roofing for homes and businesses. Free surveys, tailored quotes and 10–20 year installation guarantees, depending on the system and matting.
£5m public liability insurance · Approved liquid roof installer
Serving Thornbury from Crick
Flat roofing across Thornbury and South Gloucestershire
Thornbury is a historic market town north of Bristol, with period properties around the High Street and castle, and post-war and modern estates around the edges. Nearby villages such as Alveston, Oldbury-on-Severn and Tytherington add rural cottages and farm properties.
Thornbury sits just over the old Severn Bridge from our base, making it part of our service area.
If you're planning building work in Thornbury, such as a new extension, a loft conversion with a dormer, or converting a garage, it pays to think about the flat roof early. Getting the roof covering, edge trims and wall upstands right at the build stage is worth considering before the work starts. We can quote for the roof as soon as you have drawings or a deck in place, and we'll coordinate with your builder on timing.
If you own a property in Thornbury that already has a flat roof, a free survey gives you a clear picture of its condition before small problems become expensive ones. You'll get honest advice on whether a targeted liquid repair will do the job, whether the roof can be overlaid, or whether a full replacement with GRP or a liquid system is the better long-term spend. Whatever the answer, the quote is written, tailored to your roof in Thornbury, and free.
For active leaks in Thornbury, we offer emergency call-outs. Call 07517 190213 and discuss availability. For planned work, we'll book your free survey at a time that suits you.
Property types we can assess in Thornbury
- Period homes in the town centre
- Post-war and modern estates
- Village cottages
- Farm buildings
Flat roofing options in Thornbury
- Extension roofs
- Garage replacements
- Dormer roofs
- Leak repairs
Services in Thornbury
Every flat roofing service, available in Thornbury

GRP Fibreglass Flat Roofing
GRP fibreglass roofing for suitable extensions, garages and dormers.
GRP Fibreglass Flat Roofing in Thornbury
Liquid Roofing Systems
A liquid membrane that cures into one continuous waterproof skin around every detail.
Liquid Roofing Systems in Thornbury
Liquid Roofing Repairs
Targeted sealing for leaking or worn flat roofs, without paying for a full replacement.
Liquid Roofing Repairs in Thornbury
Flat Roof Replacement
Failed roofs stripped back and replaced with a modern GRP or liquid system.
Flat Roof Replacement in Thornbury
Emergency Leak Call-Outs
Emergency call-outs for active flat roof leaks; call to check availability.
Emergency Leak Call-Outs in Thornbury
Free Roof Surveys & Quotes
A no-cost inspection and a clear, written price tailored to your roof.
Free Roof Surveys & Quotes in Thornbury
Flat Roof Leak Repairs
Tracing and fixing leaks at the source, with honest repair-or-replace advice.
Flat Roof Leak Repairs in Thornbury
Garage Roof Replacement
Leaking garage roofs replaced with seamless GRP or liquid systems.
Garage Roof Replacement in Thornbury
Extension & Dormer Flat Roofs
Neat, seamless roofs for new and existing extensions and dormers.
Extension & Dormer Flat Roofs in Thornbury
Balcony & Terrace Waterproofing
Seamless liquid waterproofing for balconies, terraces and walkable roofs.
Balcony & Terrace Waterproofing in Thornbury
Commercial Flat Roofing
GRP and liquid roofing for offices, units and commercial buildings.
Commercial Flat Roofing in ThornburyWhy LMB in Thornbury
What you can count on
£5m Public Liability
£5 million public liability insurance.
Approved Installer
Liquid roof systems applied to the manufacturer's method.
Installation Guarantee
10–20 years, depending on the system and matting.
Free Survey
No-cost inspection and quote in Thornbury.
Emergency Call-Outs
For active leaks in Thornbury.
Local issues
Flat roof issues to consider in Thornbury
Severn Vale weather
Close to the estuary, Thornbury faces wind and rain coming up the Severn.
Ageing estate roofs
Flat roofs on 1960s–80s homes are reaching end of life.
Period property junctions
Older buildings have complex wall junctions that need careful detailing.
Our process
Five clear steps, start to finish
- Step 1
Inspection
A free visit to inspect the covering, deck, edges, upstands, outlets and penetrations.
- Step 2
Diagnosis
A plain-English explanation of the problem and your options: repair, overlay or replace.
- Step 3
Written quote
A tailored price setting out the system, scope and guarantee. No fixed rates.
- Step 4
Installation
Preparation, deck repairs where needed, and the GRP or liquid system applied correctly.
- Step 5
Check and guarantee
Completed work checked and applicable terms confirmed. Installation guarantees are 10–20 years, depending on the system and matting; repair terms are agreed separately.
Why a specialist
Why choose a GRP and liquid only roofer
Many roofers offer every type of flat roof covering: felt, rubber, asphalt and fibreglass. LMB deliberately doesn't. We work only with GRP fibreglass and approved liquid roofing systems, because both create a single, seamless waterproof surface with properly specified junctions and details.
That focus shapes every recommendation we make for flat roofing in Thornbury. We aren't trying to sell you whichever product we happen to stock. We're choosing between two modern systems on the basis of what your roof actually needs: its size, shape, deck condition, drainage, details and how it will be used.
Liam Brinkworth owns and runs the business. Contact Liam to discuss the survey, proposed work and quotation.
LMB holds £5 million public liability insurance. Liquid systems are applied as an approved installer, and installations come with a guarantee of 10 to 20 years depending on the system specified and whether it requires matting.
What affects the price of flat roofing in Thornbury? The main factors are the roof area, how easy it is to reach, the condition of the existing deck, how many details there are (pipes, vents, rooflights, upstands and outlets), whether the old covering needs stripping, and which system is specified. That is why we never quote a fixed rate. The free survey looks at each of these on your roof, so the written quote reflects the real job and the proposed scope is clear. Any changes should be discussed before additional work is agreed.
Before you call
How to check your flat roof safely
You don't need to climb onto a roof to spot most warning signs. From an upstairs window, the garden or the ground, look for cracked or blistered surfaces, moss or vegetation growing on the roof, water that stays ponded for days after rain, lifted or broken edge trims, and gaps where the roof meets a wall.
Inside, check the ceilings under the flat roof for brown stains, bubbling paint or plaster, and any damp or musty smell. Stains that grow after heavy rain are a clear sign water is getting in, even if you never see a drip.
If you can, take a few photos and note when the problem appears: after every shower, only in heavy rain, or only in wind-driven rain. That detail helps narrow down the cause before the survey and makes your free quote more accurate.
Please don't climb onto or walk on a roof to inspect it. A soft deck can give way, and wet roofs are slippery. Leave that part to us. If water is actively coming in, call us for an emergency call-out rather than waiting.
Ready to get it looked at? Request your free survey or go back to the homepage.
Questions
Flat roofing in Thornbury: FAQs
Do you serve Thornbury?
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Yes. Thornbury is part of our service area, covered from our base in Crick, near Chepstow, alongside Bristol, Bath, Newport, Somerset and Gloucestershire.
How do I check availability in Thornbury?
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For active leaks we offer emergency call-outs, so call 07517 190213 and discuss availability. For non-urgent work, we'll arrange a free survey at a time that suits you.
How much does flat roofing cost in Thornbury?
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We're strictly quote-only, because every roof differs in size, access, deck condition and detailing. Surveys and written quotes in Thornbury are free, so you'll know the exact cost before committing.
Do you offer emergency call-outs in Thornbury?
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Yes, for active flat roof leaks on homes and commercial properties in Thornbury.
What guarantee do I get in Thornbury?
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Installations carry a 10–20 year guarantee, depending on the system used and whether it requires matting.
Are you insured to work in Thornbury?
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Yes. Every job is covered by £5 million public liability insurance.
Do you cover Thornbury?
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Yes, Thornbury and surrounding villages.
Do you cover Alveston and Oldbury-on-Severn?
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Yes.
Can you roof period properties in Thornbury?
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Yes, including flat sections on older homes.
Is the survey free?
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Yes, always.
Nearby areas we cover

Book your free roof surveyin Thornbury.
Tailored quote. £5m public liability insurance. Installation guarantees of 10–20 years, depending on system and matting.
