Flat roofing specialists in Sussex

Whether you are dealing with a persistent leak, an ageing roof covering, or planning a new extension, our flat roofing service provides durable solutions for homes and businesses across Sussex.

Storm damage to flat roofs is most common between October and March. If your roof has a known weak point, getting it surveyed before the weather turns is the most cost-effective decision you can make. Survey slots are available now.

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What do you need?

Flat roofing repairs or full replacement?

If the damage is localised and the structure is sound, a repair can often extend the life of the roof. If the covering is failing across multiple areas or the deck and insulation have been compromised, replacement is usually the safest and most cost-effective option long term.

Problems we solve

Leaking roofs demand immediate attention

Flat roofing issues often start small, then quickly become expensive if ignored. We’re here to help you act early and choose the right solution.

Common problems we address include:

Leaking flat roofs causing damp patches and internal staining
Blistering, cracking, or lifting of the existing membrane
Pooling water due to poor falls or ageing materials
Cold rooms and heat loss from outdated roof construction
Loose ridge, hip, or verge areas that allow wind-driven rain in
Frequent mortar repairs on ridge or verge lines that keep failing

RESTEC Roof of the Month:

LF Flat Roofing won RESTEC Roof of the month in November 2025.

Professional service

What's included in our flat roofing service

Comprehensive survey

We assess the roof covering, deck, insulation, drainage, and roof edges.

Clear recommendation

On repair vs replacement, we provide clear options before the work goes ahead.

High-quality materials

We use the highest quality materials matched to the roof type and property use.

Professional installation

Every job is undertaken with careful detailing around edges, outlets, and joins.

Warm roof upgrades

This addon is available to improve energy efficiency and reduce condensation risk.

Full aftercare advice

Every installation comes with a guarantee and support for peace of mind.

How we work with you

Five straightforward steps from consultation to completion. We keep you informed at every stage and deliver the results you expect.

01 Consultation

A quick call to understand the issue or project and arrange a visit.

02 Site Survey

We inspect the roof, identify the cause of any problems, and take measurements.

03 Transparent Quote

Clear pricing and recommended options, with timescales and materials explained.

04 Professional Installation

Safe, tidy workmanship with a focus on watertight detailing.

05 Final Inspection and Aftercare

We check drainage, seams, edges, and finish quality, then share aftercare guidance.

Installation

Types of flat roofing we can install

Torch on felt roofing

A proven, cost-effective system for many flat and low-pitch roofs. Installed in layered sections and heat-bonded to create a watertight seal.

GRP fibreglass

A modern, joint-free system installed over solid decking with resin, matting, and topcoat. Known for a clean finish, low maintenance, and long lifespan.

Polycarbonate roofs

A lightweight and durable option for canopies, patio covers, conservatories, and walkways, allowing natural light while staying weather-resistant.

Warm roof construction

Insulation is fitted above the roof structure and below the weatherproof layer, helping reduce heat loss and lowering condensation risk.

RESTEC GRP Roofing

A durable, seamless flat roofing system applied over a solid deck using reinforced fibreglass and resin for excellent long-term reliability.

What our customers say

"Liam did a great job resurfacing the flat roof on our house. Even with inclement weather the job was finished in good time! The quote was very reasonable and Liam listened to what we needed and also to what was in our budget. Liam was very helpful, polite and tidy."

"Liam and team did a fantastic job of replacing our roof and refelting another flat area. Everything was done on time and to a high standard for a reasonable price. We were very happy with it service we received. There was a lot of mess while they were working but they left everything very clean and tidy once they finished."

"Liam and Reece stripped and relaid a flat roof over the hallway in a day, making sure all defects were repaired, and kept me informed about progress, providing before and after photos. They were professional and courteous, and cleared up all the resulting debris until nothing remained. A good job at a reasonable cost."

We stand behind every job With A 10-Year Guarantee

Every installation by LF Flat Roofing comes with a 10-year workmanship guarantee.

If the roof develops a problem due to our installation, we return and fix it at no cost.

No arguments, we put it right.

Frequently asked questions

Find answers to common questions about our flat roofing services.

How long should a flat roof last?

It depends on the system and installation quality. Many modern flat roofs last for years with the right materials and correct detailing.

Is torch-on felt or GRP better?

Both are reliable when installed properly. Torch-on felt is often chosen for value and proven performance. GRP is popular for a seamless finish and low maintenance. We recommend based on roof size, access, and how the roof will be used.

What is a warm roof and do I need one?

A warm roof places insulation above the roof structure, helping improve thermal performance and reduce condensation risk. It is often a smart choice for extensions and replacements where energy efficiency matters.

Can you repair a flat roof instead of replacing it?

Yes, if the damage is localised and the structure is sound. If multiple areas are failing or moisture has affected the deck, replacement is usually the safer option.

Do you work on garages, dormers, and balconies?

Yes, we commonly install and repair flat roofs on garages, extensions, dormers, and balcony areas, depending on access and existing construction.

Can I submit a question before booking?

Yes. Send your question along with photos if possible, and we will advise on the best next step.

If you have a question for us, give us a call!