Flat roof repair specialists in Bath. Felt repairs, GRP crack repair, EPDM patching and emergency leak response on extensions, garages and outbuildings across BA1 and BA2. Free no-obligation quotes.
Flat roofs fail at the surface and the details: a blistered or split membrane, standing water that never clears, or a leak at an upstand or outlet. Most Bath flat-roof problems are old felt reaching the end of its life.
Water ponding on the roof days after rain
Blisters, splits or cracks in the felt or covering
A leak into the room or extension below
Felt lifting at edges or around the outlet
A roof that's been patched repeatedly
When it is not the answer: If your flat roof is a sound GRP or EPDM system under 15 years old with one isolated fault, a targeted repair is far cheaper than a full replacement — we'll tell you honestly which you need. Read the full guide.
Warm deck versus cold deck flat roof construction compared
Flat Roof Repair in Bath
Flat Roof Repair Bath
Flat roof repair in Bath covers a wide range of systems and ages. Victorian bath houses and Georgian outbuildings with traditional lead flat sections. Post-war extensions on felt now 30 to 50 years old. More recent GRP and EPDM installations requiring inspection or minor repair. Each system requires a different approach and diagnosis — the most important question is always whether repair is genuinely viable or whether replacement offers better long-term value.
When to Repair vs Replace a Flat Roof in Bath
Flat roof repair is viable when less than 20 percent of the membrane is affected and the underlying deck is sound. A split felt at a drip edge, a lap joint failure, or a localised blister are all repairable. When blistering is widespread, when the deck is damp or spongy, or when the same section has been repaired multiple times, replacement is almost always better value. We assess this honestly on every visit and will always tell you if repair is not the right answer.
Emergency Flat Roof Repair in Bath
Active flat roof leaks are attended as emergencies. Bath's above-average rainfall means a failed flat roof section can cause significant internal damage within hours. We carry bitumen repair compound, EPDM patch material and GRP repair resin for same-day emergency repair across all system types in BA1 and BA2.
Flat roof leaking? Call 0122 528 7924. Same-day response available across Bath.
Repair Process
How We Assess and Repair Flat Roofs in Bath
The Deck Inspection
Before any flat roof repair in Bath, we probe the deck to assess structural integrity. A flat roof repair carried out over a wet, deflecting, or rotten deck will fail prematurely regardless of the quality of the membrane work. We use a blunt probe at regular intervals across the deck surface — any soft spots indicate moisture ingress into the deck structure. Where deck rot is found, we provide a separate quote for deck repair before any membrane work proceeds.
Repair vs Replacement Threshold
Our threshold for recommending repair versus replacement on Bath flat roofs is based on the proportion of affected membrane and the deck condition. Below 15 to 20 percent affected, repair is almost always viable and cost-effective. Above 30 percent, replacement is almost always better value. Between 20 and 30 percent, the specific type of system, the deck condition, and the remaining service life of unaffected sections determine the recommendation. We give this assessment in writing at every flat roof visit.
Emergency Flat Roof Repair Protocol
For active flat roof leaks in Bath, our emergency repair protocol is: identify the entry point by systematic inspection of the most probable failure locations; carry out a temporary repair using the appropriate system (bituminous compound for felt, GRP repair resin for GRP, EPDM patch for EPDM, lead for lead flat sections); test under simulated rainfall by water pour; confirm the leak is stopped before leaving site. The temporary repair is specified for a 3 to 12 month service life while the permanent repair is planned.
Customer Reviews
Recent Jobs
★★★★★
“Flat roof on our rear extension in Oldfield Park was leaking at the abutment. Bath Roofing repaired the upstand flashing and sealed the split the same day. Honest advice that repair was viable — not a push for GRP replacement.”
Ruth S. · Oldfield Park, Bath
★★★★★
“Emergency flat roof repair on our kitchen extension in Keynsham on a Saturday. They attended the same afternoon, found the drip edge failure, made it watertight. GRP installed the following week.”
Barry N. · Keynsham, BS31
★★★★★
“GRP crack repair on our five-year-old flat roof in Bear Flat. They found a hairline crack at the corner fillet, cleaned and repaired it in one visit. No more leak.”
Janet P. · Bear Flat, Bath
The process
How a Bath Flat Roofing Job Runs
1. Survey
We inspect the deck, falls and current covering, and identify why it's failing rather than just patching the symptom.
2. Recommend & quote
We recommend GRP or EPDM based on the roof and setting, and quote a fixed price including any deck and insulation work.
3. Scheduling
We book the job — most flat roofs are a one to three-day project — and confirm access.
4. Strip & re-lay
We strip to the deck, re-establish proper falls, upgrade insulation to current regs, and lay the new seamless covering.
5. Finish & sign-off
We complete the trims and outlets, clear the site, and hand over your guarantee and any manufacturer warranty.
Timescales
Job Durations at a Glance
Job
Typical duration
Flat roof repair
2–4 hours
Garage flat roof (GRP/EPDM)
1 day
Extension flat roof
1–2 days
Large or multi-level flat roof
2–4 days
Deck replacement
+1 day
GRP needs dry conditions to cure, so we watch the forecast and won't lay fibreglass into rain — EPDM is more weather-tolerant.
Access
Getting Safely onto Bath Roofs
Most Bath flat roofs are reached from a tower or ladder; scaffold is added only for higher or awkward extensions and is itemised. Scaffold is specified for: first-floor and above flat roofs, or where edge protection is required - always itemised in your written quote, never a hidden extra, and we arrange it.
Bath's Georgian and Victorian terraces mean tight pavements, controlled parking, and rear-access scaffold on many streets. Pavement scaffold and skip permits go through Bath & North East Somerset Council; allow a few working days on streets like Milsom Street, Broad Street, Margaret's Buildings where space is tight.
Pricing
What Flat Roofing Costs in Bath
Job
Typical range
Notes
Flat roof repair
£150–£450
Isolated fault
Garage flat roof (EPDM)
£800–£1,800
Single-ply rubber
Garage flat roof (GRP)
£1,000–£2,200
Seamless fibreglass
Extension flat roof
£1,800–£4,000
Size dependent
Large/multi-level flat roof
£3,000–£6,000+
Incl. insulation upgrade
What moves the price
Roof area and number of outlets, upstands and details
Whether the deck and insulation need replacing to meet regs
Access height on first-floor and above extensions
Worked example: A GRP fibreglass replacement on a typical rear kitchen extension in Bear Flat, including a new deck and upgraded insulation: around £2,600.
No deposit on flat-roof repairs under £500. Staged payment on full replacements, balance on completion — never anything before materials are on site. VAT included.
Covering BA1, BA2 and surrounding postcodes.
Guarantee
Your Guarantee, Explained
Our flat-roof workmanship is guaranteed for 10 years; GRP and EPDM systems carry manufacturer warranties of 20–25 years on top when installed to spec.
Covered: workmanship for 10 years, in writing, transferable if you sell.
On top: manufacturer warranties on materials (terms vary by product).
Not covered: storm or impact damage - that is an insurance matter, and we will document it for your claim.
If a fault appears in covered work, we come back and put it right. No quibbling, no re-charge.
Good to know
What It Is Like While We Work
Flat roofing is quiet, quick work with minimal mess — usually done in a day or two with the old covering taken away and the area left clean. You do not need to stay home for external work - we just need power and access agreed in advance.
GRP laying waits for a dry window; EPDM can go on in most conditions. Either way we never leave a deck exposed overnight. Bath's valley setting holds humidity, so north-facing slopes dry slowly and moss builds up through autumn.
FAQ
Frequently Asked Questions
Minor flat roof repairs cost 150 to 400 pounds depending on the system and extent. Emergency make-watertight visits cost 150 to 500 pounds. Free assessments included with all repair quotes.
Yes in most cases. We carry repair materials for felt, GRP and EPDM systems for same-day response across Bath and surrounding areas.
If less than 20 percent of the surface is affected and the deck is sound, repair is usually viable. Widespread blistering, multiple previous repairs, or a spongy deck indicate replacement is more appropriate. We assess this honestly on every visit.
We repair traditional felt, modern torch-on felt, GRP fibreglass, EPDM rubber, and lead flat sections on all Bath property types.
Yes. We cover Bath and surrounding areas 24/7 for flat roof emergencies. Call 0122 528 7924 at any time.
No. All assessments are free. You pay only for work carried out, quoted before we start.
Repair addresses a localised failure and costs 150 to 500 pounds. Replacement removes the entire system and installs new — GRP on a standard garage costs 900 to 1,800 pounds. Repair is viable when the underlying issue is localised. Replacement is better value when the system is failing across a larger area or has been repeatedly repaired.
