JW Flat Roofing Waterproofing Solutions
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Flat roofs
for Dorset
homes.

Extensions, dormers, garages, porches and bay windows. 40 years of getting domestic flat roofs right. Free drone survey, fixed-price quote, 25-year warranty — what's quoted is what you pay.

Extensions Dormers Garages Porches Bay windows Leak repairs
Domestic flat roofing

Your home's flat roof. Done properly.

Extensions, dormers, garages, porches — the finicky stuff that needs a flat-roof specialist, not a general roofer who does the odd one.

House extensions

Single-storey kitchen and side-return extensions. Warm-deck build-ups, proper insulation, sharp parapet detailing. The roof that won't leak in three winters.

Dormer roofs

Loft conversion dormers, side dormers, full-width dormers. Tight junctions to the main roof, lead flashings dressed right, GRP or single ply finishes.

Garage roofs

Strip the old bituminous felt, replace rotten deck boards, lay GRP, single ply or liquid system. Done in 2–3 days on most domestic garages, manufacturer-backed warranty on the membrane.

Porches & bay tops

The little jobs other roofers don't want. Porch canopies, bay window tops, oriel windows. Done properly in a day, no scaffolding charges on most.

Leak repairs

Diagnose the actual source (not the puddle on the ceiling). Patch overlays, seam work, full localised re-membrane. Fix it once, properly, so you're not paying twice.

Felt → modern systems

Old failing felt roof? Strip it back, fix the deck, lay GRP, single ply (EPDM) or a PU/PMMA liquid system. Goes from a 10-year roof to a 20–50 year roof. Most domestic upgrades inside 3 working days.

Skylights & lanterns

Velux roof windows, glass lanterns, roof lights on extensions. Properly upstood, properly flashed, watertight at the membrane joint — the bit cowboys miss.

Insulation upgrades

PIR insulation overlays to meet Building Regs Part L. Warm-deck conversions to stop cold-bridge condensation. Lower bills, quieter rooms, no rotting deck.

Storm damage

Stripped felt after a gale? Lifted flashings? Pooling water? Fast-response site visits, watertight emergency repairs, full insurance-claim documentation if needed.

Also: parapet detailing · lead outlets & chutes · flat-to-pitched conversions · firings & falls · cover flashings · roof lights

Why homeowners call me

When you ring, you speak to the bloke on the roof.

No call centres, no subcontractors, no "sales engineer". I'm the surveyor, the installer and the warranty contact. 40 years on domestic flat roofs across Dorset — Dorchester, Weymouth, Poole, Bournemouth and anywhere below the M4.

JW
JW Flat Roofing
Owner-operated. Surveyor, fitter, same pair of hands.

40+ years on the tools

Every domestic flat-roof failure mode, every trick of the trade. I've seen it, fixed it, and now I won't make the same mistake on your roof.

Manufacturer-backed warranties

GRP carries a 20-year material guarantee. Single ply (EPDM/TPO/PVC) up to 50 years. Bituminous schemes 10–30 years. In writing, on every invoice — real manufacturer warranties.

Free drone survey

I fly the drone before I quote. You see every failing seam, blister and pond from above — no guessing, no ladder, no "while we're up there" upsell.

Fixed-price written quotes

Free survey, fixed price in writing, no surprise extras. What's quoted is what you pay — no VAT surprises, no "we found more rotten boards" follow-up bills.

How it works

Four steps. No faff.

01

Get in touch

Call, text, or drop the form below. I'll get back to you the same working day.

02

Free drone survey

I fly the drone over your roof. You see every problem from above. Surveys booked within 24–48 hours.

03

Agree & book

Quote in writing, dates agreed. No deposit on standard domestic jobs under £2k.

04

Job done

Before-and-after photos, warranty docs, clean site. Pay by bank transfer, card, or cash.

Commercial site?

Factory, warehouse, school or shop.

Commercial flat roofing lives on its own page — same hands, scaled up, manufacturer-approved.

See commercial
Get in touch

Tell me what's up with the roof.

Free quotes within 24 hours. Drone survey with every quote — I'll come out, fly the roof, and have a proper written price back to you quickly.

Phone
07584 469397
Or call
07884 457324
Base
Dorchester, Dorset
Hours
7am–7pm, Mon–Sat

Free drone survey booked within 24 hours. Prefer to chat? Call the number.