Flat Roofing Contractors in Cardiff

Cardiff at a glance

Largest towns: Cardiff, Whitchurch
Postcode areas: CF
Building control: Cardiff Council
Neighbouring areas: Vale of Glamorgan · Caerphilly · Newport · Rhondda Cynon Taf
Guide price region: Wales (−8% on West Midlands rates)

Which towns in Cardiff do we cover?

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

What does a flat roof cost in Cardiff?

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

Job	Guide price inc VAT
Single garage (18 m²), liquid-applied	£1,900–£3,000
Dormer (8 m²), GRP, scaffold	£1,300–£2,450
Extension (20 m²), GRP, new deck + insulation	£2,750–£4,950
Upstand or flashing repair	£230–£600
Porch or bay (4 m²), EPDM	£700–£1,150
Single garage (18 m²), EPDM rubber	£1,450–£2,600

Which flat roofs are common in Cardiff?

Weather matters on a flat roof. Wales averages roughly 1,460 mm of rain a year, among the wettest in Britain, so we design for steady run-off: proper falls, clear outlets and upstands well above the finished roof. Across Cardiff, flat roofs are typically found on shops with flat-roofed rear stores below flats, low-rise post-war blocks of flats and 1930s semis with flat-roofed garages and kitchen extensions. Approximate 1991–2020 regional averages based on Met Office data.

Which flat roof jobs do we take on in Cardiff?

Flat roof replacement

Exposure matters too. Wind lifts tired edges, and repeated wetting and drying works at old joints, so roofs in exposed spots can wear faster than the same roof somewhere sheltered. Wherever your property is in Cardiff, a survey tells you whether the roof has years left or needs replacing now.

Dormer roofs

A dormer roof that has been patched several times in Cardiff often has layers of old repairs that hide the real fault. Stripping back to the deck shows what has been going on, and lets the team rebuild the back-edge abutment properly rather than sealing over it again.

Flat roof surveys and leak tracing

Businesses in Cardiff with a flat-roofed building can't plan maintenance around guesswork. A survey sets out what needs doing now, what can wait and roughly what each item will cost, so the work can be scheduled with as little disruption as possible.

Building regulations in Wales

The Welsh Approved Document L applies. Renovating more than half of a roof over a heated room means upgrading it to around 0.16 W/m²K where feasible, and new extension roofs are built to 0.13 W/m²K. Welsh Government guidance is that most re-roofing needs building control approval, so check whenever more than a quarter of a roof is replaced or repaired. We deal with the application as part of the job. More on the rules.

Which services do we offer in Cardiff?

Flat roofing in Cardiff: questions

Do you work on commercial roofs in Cardiff?

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

Who approves flat roof work in Cardiff?

Welsh guidance is that most re-roofing needs building control approval, so it's worth checking whenever more than a quarter of a roof is replaced or repaired. We check this at the survey and handle the application as part of the job.

Which roofing systems do you fit in Cardiff?

EPDM rubber, GRP fibreglass, torch-on felt, liquid-applied and single-ply, plus mastic asphalt repairs. The survey decides which suits your roof.

How much is a new flat roof in Cardiff?

A typical 18 m² EPDM garage roof is £1,450–£2,600 and a 20 m² insulated GRP extension roof is £2,750–£4,950, at Wales guide rates including VAT.

Flat roofing contractors in Cardiff