Over 25 years' experience · Roofers in Brighton, Hove and Sussex Call 01273 1104484.9 on Google from 31 reviews
New flat roof above a red tile roof, Prime West van below
Flat roofs in felt, EPDM and GRP

Flat roofing in Brighton, laid from a new deck and guaranteed for 25 years

Flat roofing in Brighton and Hove for extensions, dormers, bays and garages, in torch-on felt, EPDM rubber or GRP. Ring 01273 110448 or send the form for a free written quote.

Most flat roofs fail at the edges and the joints first: the upstand against the wall, the drip trim at the gutter, the seal round a rooflight. Lay a new layer of felt over a wet deck and the problem is trapped underneath. We strip back to the joists, replace any soft or rotten boards with a new OSB deck, and build the roof up properly from there.

We lay three systems. Torch-on felt is the tough, affordable choice for rear extensions and garages. EPDM rubber is a single sheet with no seams in the field, ideal for dormers and small roofs. GRP fibreglass gives a hard, smooth finish that suits roofs you can see from upstairs and roofs round a lantern. Prime West are Firestone approved installers, and every flat roof we lay carries our 25-year guarantee.

Brighton and Hove terraces are full of flat roofs: rear extensions, back additions, dormers and bay tops, many on their third covering. The photos here are ours, from the bare joists to finished roofs with rooflights and lanterns.

When you call, you speak to MichaelPrime West is owner-run. Michael answers the phone, surveys the roof, quotes the job and runs it with his team.

What is included

  • Old covering stripped back to the joists
  • Rotten joists and boards replaced
  • New OSB deck
  • Insulation to bring the roof up to current standards
  • Torch-on felt, EPDM rubber or GRP fibreglass
  • New upstands, drip trims and edge details
  • Rooflights, lanterns and outlets sealed in
  • Firestone approved installers

Signs you need this

  • Puddles that stay for days after rain
  • Blisters, cracks or splits in the felt
  • A soft or bouncy feel underfoot
  • Damp or mould on the ceiling below
  • Water staining where the roof meets the wall

Flat roofs: our recent work

Every photo is one of our own jobs. Tap to enlarge.

How it works

Free survey

We check the covering, the deck and the edges, and tell you which system suits the roof.

Strip and deck

Old covering off, rotten timber replaced, new deck down.

New covering

Felt, EPDM or GRP laid with proper upstands and trims.

Guaranteed

Clean finish, outlets clear, 25-year guarantee handed over.

A flat roof is only as good as its deck and its edges. We rebuild both, and guarantee the roof for 25 years.

Flat roofs: your questions answered

What does a new flat roof cost?

A small porch or bay is from about £900. A typical single-storey rear extension of 15 to 20 square metres runs from about £1,800 to £3,500 depending on the system and how much of the deck needs replacing. Our flat roof cost guide has more detail.

Felt, EPDM or GRP: which is best?

Torch-on felt is the toughest for the money. EPDM is quick to lay with no field seams. GRP gives the neatest finish and suits roofs you look down on. We recommend one when we have seen the roof.

How long does a flat roof take?

Most extension roofs take one to two days. Bigger roofs and roofs with lanterns take longer.

Can you repair my flat roof instead?

Often, yes, if the deck underneath is dry and sound. Our guide to repair or replacement explains how we decide.

Do you fit rooflights and lanterns?

Yes, as part of a new flat roof, sealed into the new covering.

Related services

Reviews

What customers say on Google

JohnnyRoof problem fixed · September 2026

Had a problem with my roof, Prime West quoted a fair price Turned up when they said they would and completed the work efficiently Highly recommend Thank you to Michael and the lads ..

TerryLeaks, roof clean and guttering · September 2026

Micheal and his team were superb and great value for money. I had a couple of big leaks and needed a complete roof clean and guttering repair work done, which they did a great job doing. I would highly recommend recommend them to others

ZoeBlocked guttering and a roof leak · September 2026

Micheal and team came and rescued me from blocked guttering and he also made minor repairs to my roof, where leak was. He was so polite and sorted it all out efficiently. Would recommend this company

RRoof repair · September 2026

I’m very happy with the roof repair carried out by Prime West Roofing. They were professional, reliable and completed the work to a very good standard. They were also friendly, efficient and left everything clean and tidy afterwards. I would definitely recommend Prime West Roofing and would use them again in the future.

AbhiLeaking roof · September 2026

They done my roof it was leaking and it was cheaper than other quotes and very good in results i loved it, they are friendly and reliable.

AgnieszkaGutter repair · September 2026

Excellent service from Prime West Roofing. They repaired my gutter quickly and professionally. Very friendly, reliable and tidy. I’m very happy with the work and would definitely recommend them.

JackRoofing work · August 2026

Would highly recommend, very skilled and professional. Very friendly and most importantly great price and tidy up to perfection when job was complete

ThomasFlat roof · August 2026

Fantastic service great job done on my flat roof

MehmetRoof clean, moss removed, tiles repaired · August 2026

Cleaned my roof they removed all moss and repaired some broken tiles Cheers

25-year
roof
guarantee
Our guarantee

Every re-roof and flat roof guaranteed for 25 years, in writing

When we re-roof your house or lay a new flat roof, our workmanship is guaranteed for 25 years from the day we finish, and the membrane, tiles, slates and flat roof systems carry their manufacturers' guarantees on top. All our work is guaranteed, and we are fully insured.

Covered

  • Our workmanship on re-roofs and flat roofs for 25 years
  • Lead, flashings, ridges and verges we fit
  • Flat roofs laid to the system's specification
  • Repairs, with the terms on your quote

On top

  • Tile and slate manufacturer guarantees
  • Membrane and flat roof system guarantees
  • Photos of the finished job
  • Michael on the end of the phone if anything is wrong

Not covered

  • Storm or accidental damage after completion
  • Work altered or added by someone else
  • Parts of the roof we did not work on
  • Gutters left to block and overflow

The guarantee for your job is written on your quote before you agree to anything. Read the full guarantee.

Talk to us about flat roofs

Ring or send the form. Michael comes out, looks at the roof, shows you what is needed and gives you a free written quote, with no obligation.

Free written roofing quoteSpeak to Michael on 01273 110448
Get my quote