Flat Roof Cost Birmingham: Rubber, Fibreglass and Felt Rates
Flat roof cost in Birmingham divides into three domestic build-ups with distinct square-metre rates, plus the deck renewal and insulation upgrade that only become visible once the old covering is stripped. Calculate the figure for the flat roof here, then compare it against a written quotation. On this page: Torch-on felt · GRP fibreglass · EPDM rubber.
Three domestic build-ups with distinct square-metre rates, plus the deck renewal and the insulation upgrade that only become visible once the old covering is stripped.
Torch-on felt runs £40 to £60 per square metre supplied and fitted. GRP fibreglass runs £60 to £100 per square metre supplied and fitted. EPDM rubber runs £80 to £120 per square metre supplied and fitted. A single garage runs roughly 15 to 18 square metres and a double roughly 30 to 36, which is enough to turn a rate into a total.
Four lines that are not in the rate
- Deck renewal A provisional sum per square metre until the covering is lifted. A quote with no deck allowance either becomes a variation or the deck gets covered over.
- Insulation upgrade Adds material and height, and is required where the thermal element duty applies.
- Firrings Restoring fall across level joists is a timber and labour cost distinct from the membrane, and it is omitted from cheap quotes.
- Parapet detailing Upstands, cover flashings and outlets, priced per linear metre. Scaffold or edge protection is needed on anything above single-storey height or with an open edge.
Felt is the cheapest to fit and the dearest per year of service life: £40–£60 over 10 to 20 years is £2.00–£6.00 per m² a year, against GRP at £60–£100 over 25 to 40 years, which is £1.50–£4.00. Deck condition is invisible until the covering is lifted, so the figure carries a provisional allowance until then.
What we fix
How much does a flat roof cost in Birmingham?
Flat roofs cost £40 to £120 per square metre supplied and fitted, depending on the system. Torch-on felt sits lowest, fibreglass in the middle, rubber highest. Deck renewal and insulation upgrade are quoted as separate lines.
How it works
The deck decides the final figure.
- A deck condition is invisible until the covering is lifted so it is priced as a provisional sum.
- Felt costs least to install, but most per year of service life.
- Level joists require firrings which add a labour and timber cost.
- An insulation upgrade is triggered by the thermal element duty on a full renewal.
What it costs
What flat roof costs
- Deck renewal provisional sum per square metre until the covering is lifted
- Insulation upgrade adds material and height, and is required where the thermal element duty applies
- Firring restoring fall across level joists adds labour and timber
- Parapet detailing upstands, cover flashings and outlets priced per linear metre
- Flat roof felt is cheapest to fit and dearest per year of service life
Straight answers
What does each flat roof system cost per square metre?
Torch-on felt costs £40 to £60 per square metre, fibreglass £60 to £100, and rubber £80 to £120. Each figure covers the membrane, its trims and labour, and assumes the existing deck is sound.
What does a garage roof cost?
A single garage roof of roughly sixteen square metres costs between £640 and £1,920 depending on system. A double garage of about thirty-three square metres runs from £1,320 to £3,960. Deck renewal is additional where the boards have decayed.
Which system is cheapest over its lifetime?
Rubber is cheapest over its lifetime. Felt at fifty pounds per square metre across fifteen years costs more each year than rubber at one hundred pounds across thirty. Lowest installation price and lowest lifetime cost are different systems.
Scaffold or edge protection is needed on anything above single-storey height or with an open edge.
What is not included in the square-metre rate?
The rate excludes deck renewal, insulation upgrade, firrings to restore fall, parapet and upstand detailing, new outlets, and access equipment. Each is itemised separately so two quotations can be compared line by line.
- Felt at £40–£60 over 10–20 years is £2.00–£6.00 per m² a year; GRP at £60–£100 over 25–40 years is £1.50–£4.00 — the comparison nobody publishes.
Why the quote carries a deck allowance
A quote with no deck allowance will either become a variation or the deck will be covered over. Single garage roughly 15–18 m², double 30–36 m², so a reader can convert a rate into a total.
Get a flat roof quoted
Restoring fall is a timber and labour cost distinct from the membrane, and is omitted from cheap quotes.
Provisional sum, and 5 more
- provisional sum
- firring
- upstand
- parapet
- thermal element duty
- cost per year of service life
A survey takes forty-five to ninety minutes and the written report follows within two working days. Nothing is charged for the survey, and nothing is charged if the report concludes that no work is needed.
Where we work
8 Birmingham and Solihull districts
- Sutton Coldfield
- Harborne
- Edgbaston
- Moseley
- Solihull
- Erdington
- Kings Heath
- Selly Oak
Postcodes outside that run are quoted case by case rather than turned away.
Related pages
Book a flat roof survey
A survey takes forty-five to ninety minutes and the written report follows within two working days. Nothing is charged for the survey, and nothing is charged if the report says nothing needs doing.