South Harrow fire stopping
Fire-rated and intumescent sealing of service penetrations and linear gaps in South Harrow and across Greater London. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.
- Openings left by services added after handover
- Unsealed penetrations discovered above suspended ceilings
- Head-of-wall gaps with no fire seal
Fire stopping near South Harrow
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
How we handle fire stopping in South Harrow
Every service that crosses a compartment wall or floor leaves an opening, and that opening needs sealing to hold back fire and smoke. Our part is installing fire-rated and intumescent sealant at those openings and along linear gaps, where the specification calls for it. Each seal follows the manufacturer’s tested detail, not a rule of thumb. If you have fire stopping installed outside its tested range and snag lists that include open service penetrations, we can help, on linear gaps at wall heads, joints between fire-resisting walls and floors and cable penetrations alike. Whoever orders the work in South Harrow, the brief is typically the same: a clear scope, tidy work and joints that don’t fail again.
In London, higher-risk residential buildings under the Building Safety Act bring extra scrutiny of fire-stopping records. We install what the designer or fire engineer has specified, and if you need records of the work, tell us and we will confirm with the quote.
Work we carry out comes with a 12-month guarantee. Should something we installed fail, call 01277 525 020 or email a schedule or drawings and we will come back to it.
- Where
- South Harrow (HA2, HA1, UB5)
- Region
- Greater London
- Guarantee
- 12 months on every job
- Quote
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Last updated
- 3 November 2026
Building owners, agents and FMs in South Harrow
Main contractors use us as their sealant subcontractor. Programme, specification and site rules come first, with CSCS-carded applicators on site.
When you manage a building on behalf of an owner, you need clear quotes and clear reporting. We quote a fixed sum, confirm the scope and walk the finished work with you or your representative, plus a 12-month guarantee.
Also near South Harrow
Also in South Harrow
Common questions from South Harrow clients
What does the BS 476 change mean for fire-rated sealant in South Harrow?
References to BS 476 classes are being removed from Approved Document B from 2 September 2029, after which BS EN 13501-2 classification is the route, subject to transitional arrangements. Our part doesn’t change: the specified product, to its tested detail.
Is Harrovian Business Village, near South Harrow, within your area?
Yes, sites like Harrovian Business Village are within our area, along with the rest of South Harrow. Photos and a short description are enough for a first look.
What do you charge?
It depends on the job: the volume of work, the access, the specified product and how it’s phased. Call for a fixed quote.
Will you quote for a small job?
Whatever the size, the process is the same: send details, get a fixed quote, we seal, guaranteed.
Can you handle several sites?
Yes. Multi-site work and planned programmes are a core part of the service, planned site by site to suit how each building is used.
Does weather matter for sealant work?
It can, when the joints are outside. Sealant won’t bond properly to a wet or frosty joint, so we watch the forecast and rearrange outside work if we have to. Indoors, the weather is rarely a problem.
Is South Harrow in your area?
Yes. South Harrow falls within our area, and you can speak to us on 01277 525 020 or email the details over to get started.
What the job involves on each surface
Cables and cable bundles
Cable penetrations are frequently sealed with fire-rated sealant where the detail allows. The detail limits bundle size and the gaps between and around cables.
Risers and ceiling voids
Risers and ceiling voids hold most of a building’s service penetrations. Access is often tight, so we agree it with you in advance.
Do you need fire stopping in South Harrow?
On a busy project, programme pressure can mean fire stopping is rushed or left to whichever trade is closest. That is when untested combinations creep in, which then have to be put right.
Site and facilities staff are often the first to spot these:
- Fire seals cut back for extra cables and never reinstated
- Builders’ foam or ordinary silicone in compartment walls
- Hidden openings found during inspections
- Fire-rated sealant that has cracked or shrunk back
At a healthcare site like Cygnet Hospital (0.7 miles east of South Harrow), new services through compartment walls are a constant, and each needs the specified seal.
What your quote should include
- Their plan for phasing and protecting the area
- How the existing material will be dealt with
- Their public liability cover
- What the guarantee covers, and for how long
Diagnose, treat, sign off
Occupied buildings need a little choreography. The work area is signed and kept contained, with routes through the building left open and work section by section so the rest of the building stays in use. Most London premises stay occupied while we are on site, so we agree zones and timings with the building or facilities manager. Areas are handed back as each section is finished.
- 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.
- Foam, ordinary sealant and debris come out.
- Backing and fire-rated sealant are installed to the detail and tooled.
- Anything outside the detail is reported to you rather than sealed.
Before we start on site
- Tell staff and tenants when we will be in
- Explain the parking and delivery arrangements
- Share your working hours and any access restrictions
Ask for a quote
If there’s a specification, drawings or a tender package, send it with your enquiry, and we’ll price against exactly what is specified. Smaller jobs need nothing more than photographs and a few notes.
Advice
Fire stopping around South Harrow: what changes locally
In London buildings, frequent fit-outs and M&E changes are a common reason fire stopping gets breached. We install fire-rated sealant where it is specified and work within the building manager’s permit system. In England, Approved Document B covers fire stopping of openings and penetrations. References to the older BS 476 classes are being removed from it from 2 September 2029, after which the European classification, BS EN 13501-2, is the route, subject to transitional arrangements. Our part stays the same: the specified product, installed to its tested detail.
Campus buildings at universities such as Westminster University, 1.6 miles to the north-east of South Harrow, see constant changes to data and services, and fire-rated sealant goes in around new penetrations where it is specified. Tenant changes at centres like St. George's Shopping Centre, 1.3 miles to the north-east of South Harrow, often mean new services through walls between units.
South Harrow is about 1 mile south of Harrow, in Greater London. Across the HA2 postcode area, it works the same way: details in, fixed quote out, then sealing and a 12-month guarantee. Our Greater London coverage takes in 764 places, from busy centres to rural villages. There’s a separate page for London, roughly 12 miles from South Harrow.
We take on service penetrations across the HA2, HA1 and UB5 postcode area, whatever the building. For a building on Park Lane, Grange Road and Dudley Road or nearby, send details and we’ll quote for service penetrations. If your building is just outside South Harrow, we cover Roxeth (1 mile north-east), Harrow (1 mile north), Harrow on the Hill (1 mile east), Rayners Lane (1 mile north-west) and Northolt (1 mile south-west). Nearby towns on our patch include London (12 miles east), City of Westminster (9 miles east), Marylebone (9 miles east), Kensington (8 miles south-east), St Pancras (10 miles east) and Shoreditch (12 miles east).
Around South Harrow
We work on buildings around Orley Farm School, Northwick Park and St Dominic's Sixth Form College, among other places. South Harrow’s nearest station is Northolt Park station, about 0.5 miles south-west of the centre. Other landmarks nearby include St. George's Shopping Centre (1.3 miles north-east) and Kodak Museum (2 miles north). For a walk, there’s Middle Lake and Northala Fields.
Looking after the joints
Your facilities or cleaning team can help the joints last. Pass these on to them:
- File the specified details where the next contractor can find them
- Settle who seals which penetrations at the start of a project
- Report damaged or disturbed seals as soon as they’re spotted
- Keep general-purpose fillers away from compartment walls
Don’t patch a fire-rated seal with anything outside its tested detail. Repairs need the same product and detail as the original.
A simple record of seal locations and products helps. When a new service goes through, everyone knows which product and detail to match, and it helps at inspections.
What sealant work can’t fix
We check first that sealant really is the fix. It isn’t the answer for:
- Gaps in walls that were never built as compartment walls
- Plastic pipes whose detail calls for a collar or wrap
- Fire doors, dampers or other fire safety equipment
Not sure which it is? You can call 01277 525 020 or email a schedule or drawings and we will tell you honestly.
Surfaces we seal
- Pipe penetrations
- Joints between fire-resisting walls and floors
- Linear gaps at wall heads
- Cable penetrations
- Small duct penetrations where the tested detail allows
- Service gaps in risers