Flat roof installation · all Sussex

A new flat roof, built to last 30 years

Extension, garage, dormer or garden room? We design, spec and fit EPDM rubber, GRP fibreglass and felt flat roofs across Sussex, with a fixed written quote and a 10 year guarantee.

  • Free survey & a fixed written quote, no obligation
  • The right system specified for your roof; EPDM, GRP or felt
  • 10 year written guarantee, water-tested on completion
See how it works
Fully insured 15+ years in Sussex Icopal / BMI approved

Request a FREE roof installation survey

Name, number, info. That’s it. We’ll call you back today.

Free survey • No call-out fee • Fixed written quote in 24 hrs

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Our team will be in touch shortly to arrange your free,
no-obligation survey.

Get it right first time

A flat roof is only as good as the way it's built

Most flat-roof problems start on day one. Wrong falls, cheap materials, joins in the wrong place. Fit it properly and it just works, quietly, for decades.

One seamless membrane

A single sheet across the whole span, no joins or seams for water to find its way through.

Falls designed in

We build in the right falls and drainage so water runs off cleanly. No ponding, no standing water.

Warm-roof build-up

Insulated to meet current building regs, warmer rooms below and no cold-roof condensation.

A finish that lasts 30+ years

Quality membranes, fitted properly by our own team, a roof you can forget about for decades.

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Free survey · no obligation · fixed written quote in 24 hrs

The right system for your roof

EPDM, GRP or felt, we recommend, you decide

There's no single "best" flat roof. It depends on the size, shape, access and how the roof will be used. On your free survey we measure up, talk through the options and recommend the system that genuinely suits your project and budget.

We're impartial: we fit all three, so we've no reason to push you toward one. You get an honest recommendation and a fixed written quote to match.

  • EPDM rubber - one seamless sheet, flexible, 30+ year life
  • GRP fibreglass - hard-wearing, walk-on, crisp trims
  • Torch-on felt - proven multi-layer system, great value
  • Skylights, warm-roof upgrades and new trims fitted in
Modern rooftop terrace with dark gray tiles, metal railing, and countryside views overlooking green fields and trees

A finished felt roof installation, water-tested on completion.

How it works

From first survey to finished roof

Step 01

Free survey & measure-up

We visit, measure the roof, check access and the deck, and talk through what you want from it.

Step 02

System & design

We spec the right membrane, the falls, insulation and detailing, and explain why.

Step 03

Fixed written quote

A clear, itemised proposal, no obligation, no pressure, no surprises later.

Step 04

Installation & handover

Fitted by our own team, water-tested, tidied up, and handed over with photos and a 10 year guarantee.

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Step 1 takes 2 minutes · free survey · no obligation

Recent work

Flat roofs installed across Sussex

A few recent installations. Every roof is measured, specified and fitted by our own team, then water-tested and handed over with full photo records.

New asphalt driveway with metal gates and rural countryside views, featuring bare trees and open fields in background.

Shoreham

New felt roof · water-tested

Roofer using blowtorch to heat roofing membrane during flat roof installation and waterproofing works on building.

Worthing

Re-roofed in EPDM rubber · single sheet

Aerial view of a residential roof with a skylight window installed on dark slate tiles, surrounded by neighbouring houses.

Hove

New felt roof and skylight · water-tested

Modern flat roof with grey membrane, skylights and black posts overlooking landscaped garden with trees and shrubs.

Crawley

Old felt stripped · garage re-roof

Modern flat roof with multiple skylight windows and grey membrane covering, surrounded by green trees and manicured garden.

Crawley

New skylights fitted · garage re-roof

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Free survey · no obligation · fixed written quote

Booking installations now, limited slots each week

Planning a new flat roof?

Book a free survey and we'll measure up, recommend the right system and give you a fixed written quote, no obligation.

  • Free survey
  • Fixed written quote
  • 10-year guarantee

Why choose us

Why Sussex homeowners choose LF Flat Roofing

Impartial advice, no upselling

We fit EPDM, GRP and felt, so we recommend what genuinely suits your roof, not whatever earns us most. If a simpler system will do the job, we'll say so.

5.0 Checkatrade · 100+ reviews

Fixed written quotes

A clear, itemised price before we start. The number we quote is the number you pay.

Guaranteed 10 years

Every roof is water-tested on completion and backed by a 10 year written workmanship guarantee.

Icopal / BMI approved

Approved installers working to manufacturer specs , so the materials are guaranteed too.

Photo records at handover

You see exactly what went in under the covering, deck, insulation, detailing and all.

All of Sussex covered

Brighton, Worthing, Crawley, Horsham, Chichester, Eastbourne and everywhere between.

Icopal / BMI approved
RESTEC Roof of the Month · Nov 2025

Real customers

Roofs they don't have to think about

“New warm roof on our flat-roof extension. Warmer room, no condensation, and they left the place cleaner than they found it. Highly recommend.”

Homeowner Worthing
Verified

“Got three quotes; LF were the only ones who explained the falls and insulation properly. Fixed price, no surprises, brilliant job on the garage.”

Homeowner Horsham
Verified

“They re-roofed our extension in EPDM. Turned up when they said, tidy every day, and talked us through each stage. The finish is spotless.”

Homeowner Hove
Verified

Free survey · all Sussex

Book your free flat roof survey

Tell us a little about your project and we'll arrange a visit, recommend the right system and put a fixed written quote in front of you, with no obligation to go ahead.

  • A real Sussex roofer visits and measures up
  • Honest recommendation across EPDM, GRP and felt
  • Fixed written quote, no pressure, no obligation
  • 10 year written guarantee on every install
Prefer to talk? Call 07793 436 150

Request a FREE roof installation survey

Leave your details and we’ll call you straight back.

Thanks, we’ll call you back.
Our team will be in touch shortly to arrange your free,
no-obligation survey.

Questions

Flat roof installation, answered

It depends on the roof. EPDM rubber is a single seamless sheet that's flexible and long-lasting; GRP fibreglass is hard-wearing and good where the roof gets walked on; modern torch-on felt is a proven, great-value multi-layer system. On your free survey we look at the size, shape, access and use, then recommend the one that genuinely fits — we fit all three, so the advice is impartial.
Most domestic flat roofs — a garage, extension or dormer — take one to three days once we're on site, depending on size, the deck condition and weather. We'll give you a realistic timescale with your quote.
A brand-new roof or a warm-roof upgrade usually needs to meet current building regs for insulation. We build to those standards as a matter of course and can talk you through what's needed for your project on the survey.
Fitted properly, a quality EPDM or GRP flat roof will comfortably see 30 years or more, and modern felt systems 15–25 years. Every install is water-tested and backed by our 10-year written workmanship guarantee, on top of the manufacturer's material guarantee.