Flat Roofing Contractors in Cornwall

Cornwall at a glance

Largest towns: Redruth, Falmouth, St Austell, Truro
Postcode areas: PL, TR
Building control: Cornwall Council
Neighbouring areas: Devon · Somerset · Bristol · Dorset
Guide price region: South West (+3% on West Midlands rates)

Which towns in Cornwall do we cover?

9 towns and cities have their own page; we cover everywhere in between too.

What does a flat roof cost in Cornwall?

Guide prices at South West rates, including VAT. The fixed price comes after a survey.

Job	Guide price inc VAT
Single garage (18 m²), torch-on felt	£1,550–£2,700
Extension (20 m²), GRP, new deck + insulation	£3,100–£5,550
Balcony (12 m²), liquid-applied, scaffold	£1,950–£3,350
Extension (20 m²), EPDM, insulation + 1 rooflight upstand	£3,100–£5,400
Upstand or flashing repair	£260–£670
Dormer (8 m²), GRP, scaffold	£1,450–£2,750

Which flat roofs are common in Cornwall?

Weather matters on a flat roof. The South West averages roughly 1,260 mm of rain a year and many roofs face wind off the Atlantic, so we specify fixings and edge details for wind uplift as well as drainage. Across Cornwall, flat roofs are typically found on 1930s semis with flat-roofed garages and kitchen extensions, lock-up garage blocks on estates and terraced streets with flat-roofed rear kitchens and bathrooms. Approximate 1991–2020 regional averages based on Met Office data.

Which flat roof jobs do we take on in Cornwall?

Single-ply membrane roofing

For a commercial roof in Cornwall with rooflights, plant and outlets, single-ply's welded details give a consistent finish. Pre-formed corners, membrane-coated trims and welded kerbs are all made in the same material as the main roof, which keeps the roof consistent and simplifies any future repairs.

Commercial flat roofing

We are flat roof specialists, so a commercial roof in Cornwall gets a system chosen for the job: single-ply for large, simple areas, built-up felt where there is foot traffic and plant, or a liquid overlay where the existing roof is sound. The survey explains the trade-offs in plain terms.

Garage roofs

A garage in Cornwall that is becoming a workshop, gym or home office is a good reason to replace its roof. That is the moment to think about insulation and a warm-roof build-up, so the roof does not have to be stripped again when the space is heated.

Building regulations in England

Replacing more than half of a flat roof over a heated room usually counts as renovating a thermal element, so the roof is insulated to around 0.16 W/m²K where that's technically and economically feasible, and the work is notified to building control: the council or a registered building control approver, unless a registered competent person self-certifies it. A roof on a new extension is built to 0.15 W/m²K. Patch repairs, and most unheated detached garages, don't trigger the upgrade. Structural changes, or a new covering that adds 15% or more to the roof's weight, also need approval. More on the rules.

Which services do we offer in Cornwall?

Flat roofing in Cornwall: questions

Which postcode areas do you cover in Cornwall?

All of Cornwall, including the PL, TR postcode areas. Send your full postcode and we'll confirm.

Who approves flat roof work in Cornwall?

Replacing more than half of a roof over a heated room usually counts as renovating a thermal element, so it is insulated to current standards and notified to building control. We check this at the survey and handle the application as part of the job.

Do you work on commercial roofs in Cornwall?

Yes: shops, offices, units and blocks of flats across Cornwall, with work planned around opening hours and residents.

How soon can you survey a roof in Cornwall?

It depends on the time of year and where the roof is; we give you a date when you get in touch, and leaks are prioritised.

Flat roofing contractors in Cornwall