Fire-rated sealing and fire stopping in Greenhill, Greater London
Commercial sealant work in Greenhill for contractors, FMs and building owners: fire-rated and intumescent sealing of service penetrations and linear gaps, quoted at a fixed price.
- Head-of-wall gaps with no fire seal
- Fire seals cut back for extra cables and never reinstated
- Seals that don’t match their tested detail
Fire stopping for Greenhill sites
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Owners, agents and contractors
As a CHAS accredited contractor and Constructionline member, we make supplier vetting simple. We are fully insured, and our insurance certificate can go with the quote.
FMs need a contractor who is easy to get on site. Let us know the documents you need (RAMS, insurance certificate, CSCS details) and we’ll confirm them with the quote.
Fire stopping in Greenhill
No fire sealant works on its own: its test evidence covers one product in one kind of wall or floor, with set services, gaps, depths and backing. Before we seal anything, we check the opening against the detail it is meant to follow, and raise it with you if it falls outside. The enquiries we see most involve builders’ foam or ordinary silicone in compartment walls and unsealed joints where partitions meet the slab, across linear gaps at wall heads, service gaps in risers and pipe penetrations. Whoever orders the work in Greenhill, the brief is typically the same: a fixed quote, no surprises on site and a 12-month guarantee behind the result.
Taller residential buildings in London may fall under the Building Safety Act’s higher-risk regime, where fire-stopping records get close attention. Our part is installing the specified fire-rated sealant; tell us what records you need and we will confirm with the quote.
We stand behind the joints we seal with a 12-month guarantee. It covers how we prepared and applied the sealant, and if something we did falls short, we return to it.
- Where
- Greenhill (NW3, NW6)
- Region
- Greater London
- Guarantee
- A 12-month guarantee
- Quotes
- A fixed quote before we start
- Call
- 01277 525 020
- Page updated
- 3 November 2026
Places near Greenhill
More services for Greenhill
What we can’t put right
Part of a good diagnosis is knowing where sealant stops. We’ll tell you if the real problem is one of these:
- Approving the work on behalf of building control
- Walls or floors that aren’t fire-resisting to begin with
- Writing the fire-stopping specification
Not sure which it is? You can phone 01277 525 020 or send photos by email and we’ll tell you honestly before you book.
Where we work in Greenhill
- Pipe penetrations
- Service gaps in risers
- Small duct penetrations where the tested detail allows
- Joints between fire-resisting walls and floors
- Cable penetrations
- Linear gaps at wall heads
What we are called out for in Greenhill
Most open service penetrations are left by later work. A new cable pulled by an electrician, a pipe rerouted by a plumber or a data run drilled through a riser leaves an opening that nobody returns to. Across several fit-outs, the openings add up.
Site and facilities staff are often the first to spot these:
- Openings left by services added after handover
- Expanding foam used as fire stopping
- Fire-stopping items raised at inspection or handover
- Open linear gaps along the top of fire-resisting walls
Tenant changes at centres like O2 Centre, 0.6 miles to the south-west of Greenhill, often mean new services through walls between units.
Questions to ask before you book
- Is the sealant right for the movement and the substrate?
- Will RAMS and insurance details be available?
- Their pre-qualification and accreditations
- Whether their applicators hold CSCS cards
Fire-rated sealing for Greenhill buildings
There are five care or nursing homes within about 2 miles of Greenhill. Care homes rely on fire-resisting walls and floors, and maintenance work that breaks through them leaves openings to seal. We install fire-rated sealant to the tested detail where it is specified. With tenants changing and fit-outs following, London buildings see service routes altered again and again. We install fire-rated sealant where it is specified and work within the building manager’s permit system.
At a healthcare site like Royal Free Hospital (less than half a mile east of Greenhill), new services through compartment walls are a constant, and each needs the specified seal. For an estates team at a campus like Regent's University London, which lies south-east of Greenhill, summer M&E works are usually followed by a round of penetration sealing.
Greenhill is about 1 mile north-east of Hampstead, in Greater London. We cover Greenhill and the rest of Greater London, with the same fixed quotes and 12-month guarantee as everywhere else. Our Greater London coverage takes in 764 places.
If you need fire stopping in NW3 and NW6, the process matches everywhere else we work: details, then a fixed price, then sealing and a 12-month guarantee. If your site is on Back Lane, Well Road and Ornan Road or close by, send details and we will quote for service penetrations. If your building is just outside Greenhill, we cover Hampstead (1 mile south-west), Vale of Health (1 mile north), West Hampstead (1 mile west), Fortune Green (1 mile west) and Haverstock (1 mile south-east). Nearby towns on our patch include London (5 miles south-east), City of Westminster (3 miles south), Marylebone (3 miles south-east), Kensington (4 miles south), St Pancras (3 miles south-east) and Shoreditch (5 miles south-east).
Near you in Greenhill
Locally, jobs take us to sites close to Cecil Sharp House, Fitzjohn's Primary School and King William IV Public House. Other local landmarks include South Hampstead High School (0.6 miles south) and Hampstead Heath (0.7 miles north-east). There’s a railway station in Greenhill itself: Hampstead Heath station. Other landmarks nearby include New End Hospital (less than half a mile north-west) and Montfichet's Tower (4.3 miles south-east). The countryside around Greenhill includes Belsize Wood and Parliament Hill.
How a job runs
We schedule the visit to fit the site hours and access windows you give us. While we’re working, the area stays contained and tidy, and we check in with your contact before moving on to each new area. For a job in Greenhill, access comes first. Send the building rules and access times with your enquiry.
- The specification and schedule come first, so we know which details apply.
- We plan the sequence of floors, risers and voids with you.
- Each opening is checked for wall or floor type, service, gap and depth.
- Unsuitable material is removed and the opening cleaned first.
- The specified backing and sealant go in to depth and are finished neatly.
- Anything outside the detail is reported to you rather than sealed.
Before we start on site
- For older buildings, check the asbestos register before work
- Tell us your opening times and when work is allowed
- Move anything stored against the joints
Getting a fixed quote
Need a figure for a tender or a budget? We will quote against your scope and drawings that you can work with. If you have questions first, call the office on 01277 525 020 or send details through our quote form.
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Your questions answered
Could you schedule work at a campus like Regent's University London for the vacation?
Yes. Education sites normally want the work in vacations or in phases during term, and we plan to suit. Tell us which site documents you need, such as RAMS, our insurance certificate or CSCS details, and they’re confirmed with the quote.
Would you work within a site like Royal Free Hospital?
Yes. Healthcare sites are among the places we work. Each area is agreed with the ward or department and the estates team in advance.
What’s the quickest route to a quote?
There are four steps: send details, get a quote, we seal, guaranteed. Step one needs little more than photographs and a postcode.
How soon can the area be used again?
That comes down to the sealant and the temperature. Some take light use quickly, others need longer to cure, so we’ll confirm the curing time on the day.
Can you work to our specification?
Yes. Send it with your enquiry, and we’ll price the work to it.
Do you guarantee your work?
Yes. It runs for twelve months and covers how we prepared and sealed the joints, but not damage, misuse or other trades’ work.
Can you handle several sites?
Yes. A group of buildings can go on one quote, with one point of contact.
Maintenance after handover
Your facilities or cleaning team can help the joints last. Pass these on to them:
- Settle who seals which penetrations at the start of a project
- Leave fire sealant to cure fully before covering it
- Have penetrations checked while they can still be seen
- Include service cupboards in routine inspections
Keep the product data and installation details with the building’s fire safety information. It makes later repairs much easier to match.
Keep a register of where seals are and what they are made of. It tells the next contractor exactly what to reinstate, and it helps at inspections.
Leave it or put it right?
Open service penetrations matter on ordinary days, not just in a fire: they also carry noise, draughts and smells between rooms. Sealing them to the specified detail deals with the fire risk first and the building feels the difference. Access in London is hard enough to arrange once, so while access is arranged it pays to renew all failing joints, not just the worst.
We don’t publish prices, because the scope varies so much from one building to the next. Call for a quote and we’ll price your job on its own details.
Why clients in Greenhill choose us
- CSCS-carded applicators
- Workmanship guaranteed for 12 months
- Commercial sealant work since 2005
- One phone line for London, the South East and Scotland
See how commercial sealant jobs are priced and how we’re accredited.