Project-managed refurbishment & building, London Covering all London boroughs 07498 597339
Gas Safe engineers NICEIC engineers Fully Insured
Commercial roofing across London

Commercial roofing London:
leaks stopped,
roofs repaired.

Water through a ceiling closes a shop floor, ruins stock and puts tenants on the phone to the managing agent. We stop the water first, trace where it is getting in, and fix the cause. Then we put the roof on a schedule so it does not happen again.

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What we work on

Flat, metal and pitched,
and the gutters between.

Commercial roofs in London are a mix. Flat roofs in felt or single ply on shops, offices and blocks.

When it is leaking now

Water out first,
then the cause.

Leaks are triaged in our opening hours, Monday to Saturday 9am to 8pm and Sunday 9am to 3pm.

Planned roof maintenance

Two visits a year
prevent most call outs.

Most leaks start with something a routine visit would catch: leaves in an outlet, silt in a box gutter, a lifted flashing after a storm. Roof visits can sit inside a wider property maintenance schedule.

Older industrial roofs are often asbestos cement sheeting. If the roof is pre 2000 and the work will disturb it, an asbestos survey comes first.

Common questions

Questions we get
asked most.

How often should a commercial roof be inspected?+
Twice a year is the usual recommendation, in late autumn after leaf fall and again in spring, plus after any severe storm.
Can you work while the business stays open?+
Usually, yes. Work is planned around trading hours and the roof is made weathertight at the end of each day.
Do you provide reports for landlords and managing agents?+
Yes. Every inspection and repair comes with photographs and a written record, logged against the building.
Do you repair metal roofs?+
Yes: failed laps, corroded fixings, cracked rooflights and gutter linings on profiled metal roofs.
Can a flat roof be coated instead of replaced?+
Sometimes. A liquid applied coating can work where the deck is dry and sound.
Can you repair a commercial roof leak without replacing the roof?+
Usually, yes. Most leaks come from a single defect such as a failed lap, outlet or flashing, which is repaired once it has been traced.
Do you line commercial box gutters?+
Yes. Box and valley gutters are cleaned, dried and lined, and outlets are checked so water drains away.
Tell us about the building

Get a written
price.

Quicker to ring
07498 597339

Monday to Saturday 9am to 8pm, Sunday 9am to 3pm. All London boroughs.

Message us on WhatsApp
Or email
enquiry@gmasgroup.co.uk

Send photos of the leak and the roof if you can reach them safely, and we will tell you what to do first.

Commercial roof repairs

Commercial roof repair, leaks and gutters.

Commercial roof leak repair

A leak often shows metres from where water gets in. We trace it through outlets, upstands and flashings and repair the cause.

Commercial flat roof repair

Splits, blisters and failed laps on felt, single ply and liquid roofs are repaired in kind. If a flat roof is worn out, we price an overlay instead.

Gutter lining

Rusted or cracked box and valley gutters are cleaned, dried and lined, with outlets checked so water clears.

Industrial roof repairs

Fixings, laps, rooflights and cut edges on warehouses and units, with safe access around fragile sheets.

Where we work

Commercial roofing across London, including Finchley and north London, Kensington, Earl's Court and Belgravia, for shops, offices, mansion blocks and mixed use buildings.

Roof types

The commercial roofs we repair and maintain.

Felt and built-up roofs

Common on older shops, offices and blocks. Blisters, split laps and failed upstands are repaired in kind, and badly worn areas can be overlaid where the deck is sound.

Single ply membranes

PVC, TPO and EPDM roofs. Most leaks come from punctures, failed seams and detailing at outlets, which can be repaired without replacing the whole roof.

Metal and profiled sheet roofs

Corroded fixings, failed lap seals and cut edge corrosion on industrial units are treated and sealed, and damaged sheets replaced.

Pitched tiles and slates

Slipped slates, ridges, valleys and flashings on mixed use and residential blocks, together with the gutters and parapets that serve them.

How a job runs

Surveyed, made safe, repaired and reported.

Survey and report

We inspect the roof, record the defects with photographs and set out what needs doing now and what can be planned.

Access and safety

Scaffold, edge protection or powered access are arranged to suit the building, with a risk assessment and method statement before work starts.

Repair or overlay

Repairs are carried out in the material the roof is made of.

Sign-off

You receive photographs of the finished work, which managing agents and landlords can keep with their maintenance records.

Coverage

Areas we cover.

We take commercial roofing across all 32 London boroughs. Most of our work is in west London, in Shepherd's Bush, Hammersmith, Fulham, Kensington, Chiswick and White City, and in south west London, in Putney, Wandsworth and Wimbledon. We also work in south east London, in Greenwich, Blackheath and Lewisham.

If your property is outside these areas, call us anyway. We travel across London and will tell you honestly if a job is too far to price properly.

Message us
Call GMAS on 07498 597339