The building keeps trading
Work happens on top of an operating building, with no strip-out, nothing to clear from the floor below and no need to close a floor, a unit or a production line.
Roofing Solutions / Commercial
Commercial Flat Roofing in London
Flat roof refurbishment for occupied commercial and industrial buildings across London. Applied cold, with no hot works, no strip-out and no shutdown below.
Book a site surveyRefurbish the roof without closing the building
This page is for facilities managers, managing agents and commercial property owners in London responsible for a flat roof that is leaking, ponding or coming up for renewal. K & M Roofing Solutions refurbishes and waterproofs commercial and industrial flat roofs, and in most cases does it without a strip-out and without taking the building out of use.
The constraint on a commercial roof is almost never the roofing. It is everything around it: tenants who cannot be disturbed, stock that cannot be moved, a production line that cannot stop, a hot works permit nobody wants to sign and a landlord who wants the cost in this year rather than next. A cold-applied overlay removes most of those constraints at once, because the work happens above a building that carries on operating.
The system behind that is HYDRONYLON, a liquid-applied waterproofing system certified to ETA-23/0735. A European Technical Assessment is an independent, published assessment of how the product performs, carried out by a designated Technical Assessment Body, which means the certification number is something your surveyor, your building control officer or your insurer can look up rather than take on trust. K & M Roofing Solutions is a certified applicator, which is what allows the separate 10-year product guarantee from HYDRONYLON LTD to be issued on your roof alongside our own workmanship guarantee.
It also changes how the spend is classified. Stripping and replacing a roof is a capital project with a business case attached. Refurbishing a sound roof to extend its serviceable life is maintenance, which sits in a different budget, needs a different approval and usually happens far sooner.
Two parts of London account for most of this work. The warehouses, railway arches and converted industrial blocks behind Tower Bridge Road are covered on our page for roofing in Southwark, SE1.
The newer commercial stock and the mixed-use blocks along the river are on the page for roofing in Vauxhall and Nine Elms, SW8.
If you need a figure before you can raise anything internally, the indicative 2026 rates per square metre and what moves them are set out in our flat roof cost guide for London.
Benefits
Why commercial clients choose an overlay
No hot works on site
The system is applied cold, so there is no torch, no naked flame, no hot works permit to raise and no fire watch for your team to staff.
Working hours that suit the building
Where access crosses a trading floor or noise would disturb tenants, evening, weekend or shutdown working can usually be arranged. It is agreed and priced at quotation rather than added later, so tell us at survey if the building needs it.
Maintenance, not capital
Refurbishing a sound roof is generally a maintenance line rather than a capital project, which is a different approval route and usually a much shorter one.
What we offer
Buildings we work on
Offices
Occupied office buildings where the roof sits directly above desks and server rooms, and where a single leak is a business continuity problem rather than a maintenance ticket. Work is phased so no bay is open at the end of a working day.
Warehouses and industrial units
Large-area flat and low-pitch roofs over racking, stock and production. The economics here are the strongest, because the cost of stopping the operation to strip a roof usually exceeds the cost of the roofing itself.
Retail units and parks
Shops and retail parks where trading hours dictate everything. Where the shopfloor cannot be disturbed we will look at working outside trading hours, and we keep service yards and fire exits clear throughout.
Apartment blocks and communal roofs
Blocks of flats where the roof is a communal asset and the works are recharged through the service charge. We provide the itemised specification and photographic evidence needed to support a Section 20 consultation.
Education and healthcare
Schools, colleges and clinics where the site is occupied, safeguarding and access control apply, and the work often has to fit into holidays or out-of-hours windows. We work to whatever induction and permit process the site operates.
Liquid overlay systems
The system behind most of this work is a certified liquid-applied waterproofing system taken cold over the existing covering, seamless across the field of the roof and around every outlet and penetration.
See how liquid applied waterproofing worksScope
What we provide before we start on site
- Public liability insurance certificate, cover of 5 million pounds
- Employers liability insurance certificate, cover of 10 million pounds
- A site-specific RAMS pack prepared before works begin
- Method statement covering access, edge protection and exclusion zones
- Agreed working hours, including any evening or weekend working the building needs
- Named site contact and an agreed escalation route
- Photographic condition record of the roof as found
- Waste handling plan, minimal on an overlay because there is no strip-out
How it works
How a commercial project runs
1
Site survey and leak trace
We walk the roof, trace where water is actually entering, check falls, outlets, upstands and penetrations, and establish whether the substrate will take an overlay. Free, and normally arranged within a week.
2
Condition report and specification
You get a photographic condition report and an itemised specification separating preparation, detailing, waterproofing and access, in a form that can go to tender or straight into a Section 20 consultation.
3
Documentation and approvals
Insurance certificates, RAMS and method statements are issued to your office before anything is booked, and we complete whatever induction and permit process your site runs.
4
Programme agreed around the building
Access routes, welfare, storage, working hours and any evening, weekend or shutdown windows are agreed with your facilities team, so the programme fits the operation rather than the other way round.
5
Phased application
Preparation and waterproofing are carried out bay by bay so no area of roof is left open, applied cold with no hot works, and the building continues operating underneath throughout.
6
Handover pack and guarantee
Photographic completion record, the specification as built, and the 10-year workmanship guarantee in writing, alongside the separate 10-year HYDRONYLON LTD product guarantee where that system was used.
Why choose us
Why customers choose K & M Roofing
01
Certified HYDRONYLON applicators, a system most London roofers cannot offer.
02
One team for the whole job, from survey to sign-off.
03
Rated 5.0 by 60 customers on Google.
04
A directly employed team on site rather than a labour-only subcontract chain, so the people inducted onto your site are the people who did the work.
05
Transparent pricing with no hidden costs, and a 10-year workmanship guarantee.
Knowledge
Read more before you decide
Common questions
Frequently asked questions
Yes, and on most of our commercial projects it does. Because the system is applied cold over the existing covering there is no strip-out, nothing falls into the building, and no floor area has to be cleared below. Offices keep working, shops keep trading and warehouses keep picking. The exception is directly beneath a section being prepared, where we agree a temporary exclusion zone for a few hours.
By removing the three things that normally cause it: the strip-out, the hot works and the skip. An overlay generates almost no waste, needs no torch and makes considerably less noise than stripping a roof. Beyond that we phase the work bay by bay, keep access routes and fire exits clear, agree delivery and craneage times outside peak hours, and give your team a named contact, so anything raised from the building goes straight to the people on the roof instead of sitting in a queue until the end of the week.
Often, yes. Evening, weekend and shutdown working can usually be arranged on commercial and industrial sites, particularly where roof access crosses a trading floor, where noise would disturb residential tenants above or below, or where a site simply cannot have contractors on it during business hours. Whether it is possible on your building depends on the job and on what else is booked, so raise it at survey: it is then agreed and priced at quotation stage rather than added as a variation afterwards.
We carry public liability insurance with cover of 5 million pounds and employers liability insurance with cover of 10 million pounds, and we issue the certificates to your office before we come to site rather than waiting to be asked. Most managing agents and facilities teams need this on file before they can instruct, so we treat it as part of mobilisation.
Yes. A site-specific risk assessment and method statement pack is prepared before works begin, covering access, edge protection, exclusion zones, materials handling and emergency procedures for your building specifically rather than a generic template. It is issued with the insurance documentation, and we complete whatever induction, permit-to-work and sign-in process your site operates.
Access is agreed at survey and set out in the RAMS, whether that is an existing roof hatch, a fixed ladder, a mast climber or scaffold. On the roof we establish edge protection and a marked exclusion zone around the working area, and where the roof is trafficked by your own staff or plant contractors we agree a route that keeps them clear of wet materials. Nothing is stored on the roof overnight beyond what is safe and secured.
Yes. We survey portfolios as a whole, report on each roof with a condition grading and an indicative priority, and price the works so they can be staged across budget years rather than all falling in one. That gives you a defensible order of works and a forecast rather than a series of unrelated emergency repairs, and one contractor and one set of documentation across the estate.
Per square metre, with the rate driven by the condition of the substrate rather than the area. A sound roof needing cleaning, priming and waterproofing sits at the bottom of the range; one needing extensive cutting out, detail rebuilding and new outlets sits well above it. Access, phasing and any evening or weekend working are itemised separately so you can see what each is costing. There are no reliable published rates for commercial refurbishment that we would stand behind, so we do not quote a figure sight unseen. A binding price from K & M Roofing Solutions follows a free site survey.
That is your finance team to determine, but the practical distinction is usually this: replacing a roof creates a new asset and is treated as capital, while refurbishing a sound roof to extend its serviceable life is generally treated as maintenance. Because an overlay keeps the existing deck and covering in place and extends what is already there, it commonly sits on the maintenance side, which is a different approval route and often a considerably faster one. We provide the itemised specification your finance team needs to make that call.
Free on-site estimate
Let us talk about your roof
Tell us what is going on and we will arrange a free survey. No pressure, no hard sell, just honest advice and a clear price.
Kamil07593 196505
Mateusz07544 188268