How long does a modern flat roof last?

EPDM rubber and GRP fibreglass systems typically last 25 to 40 years when installed to manufacturer specification. High-performance felt systems last around 20 to 25 years.

Do I need building regulations approval?

A like-for-like re-cover is usually classed as repair, but any change to insulation or structure triggers building regulations. We handle notifications where required.

Can you overlay my existing flat roof?

Sometimes, if the existing deck is sound and dry. We always advise a strip and re-lay if there is any doubt — it costs slightly more but avoids trapping problems under the new roof.

How much does a new flat roof cost in Southampton?

A typical single-storey extension flat roof of around 15–20 m² starts from £2,200 in EPDM and £2,600 in GRP. We provide fixed written quotes after survey.

Flat Roofing Southampton

Name: Southampton Roofing Specialists
Address: 1 High Street, Southampton, Hampshire, SO14 2AA, GB
Telephone: 07537 179639
Price range: ££
Rating: 4.9

Modern flat roofing systems with 20-year guarantees — installed by specialists.

Modern flat roofing has come a long way from the three-layer felt roofs of the 1970s. Today's EPDM rubber, GRP fibreglass and high-performance elastomeric felt systems can comfortably last 25 to 40 years when installed correctly. Southampton Roofing Specialists installs all three, and we choose the right system for the job rather than trying to fit every project into one product. We work on domestic extensions, garages, dormers and larger commercial roofs across Southampton and Hampshire.

Get a free quote 07537 179639

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Mon–Sat 07:00–19:00 · 24/7 emergencies

What our flat roofing service includes

Free flat roof survey and moisture check
Stripping and safe disposal of the existing covering
New OSB3 or ply deck where required
Insulation upgrade to current Part L building regulations
EPDM rubber membrane installation (single-piece where possible)
GRP fibreglass installation with matched trims
Torch-on and self-adhesive felt systems
New outlets, drips, upstands and lead flashings

Benefits

25 to 40 year lifespan on modern systems
Seamless, joint-free EPDM options
Improved thermal performance and reduced heat loss
Fully guaranteed with insurance-backed options available
Neat, modern finish that respects the property

Common problems we solve

Ponding water

Standing water is the number one enemy of a flat roof. We correct falls during installation so water is directed to outlets.

Blistering and splits

Old felt systems trap moisture and blister. A modern EPDM or GRP overlay eliminates this failure mode entirely.

Failed upstands and flashings

Most flat roof leaks occur at junctions. Our details use proprietary trims and code-appropriate lead.

Under-insulated decks

Older flat roofs are often uninsulated. We can add PIR insulation as part of a re-roof to bring the deck up to current standards.

Our process

Step 1
Site survey
We measure, photograph and check the existing deck for moisture and structural condition.
Step 2
System recommendation
We recommend EPDM, GRP or felt based on the roof's size, shape, aesthetics and budget — with a written quote.
Step 3
Installation
We strip back to a sound deck, upgrade insulation, and install the new membrane with all associated trims and flashings.
Step 4
Handover
Site cleared, photographs supplied, guarantee documentation issued.

Materials we use

Firestone RubberCover EPDMClassicbond EPDMGRP fibreglass by GacoFlex and Cure ItIKO Permaphalt torch-on feltCromar Pro GRP systems

Why choose Southampton Roofing Specialists

Approved installers for major flat roof systems
Up to 20-year manufacturer guarantees available
Fixed-price quotes with no hidden extras
Fully insured to £5 million public liability
Southampton-based team, easy to contact after installation