Fire stopping in Belsize
Work needed on a service penetration in Belsize? We assess it, carry out the work and guarantee our workmanship for 12 months.
- Snag lists that include open service penetrations
- Seals that don’t match their tested detail
- Open linear gaps along the top of fire-resisting walls
Fire stopping for Belsize sites
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
On site: what to expect
When we get to site, we report to your site contact and complete whatever induction the building runs. Floors, finishes and fittings next to the joints are covered before anything is cut or cleaned, with the work itself typically taking anything from one day to a planned run of visits, depending on the number of seals and the access. For a building around Belsize, tell us how to find it and who will meet us. Send that with the details and we will confirm the plan with the quote.
- The specification and schedule come first, so we know which details apply.
- Access, permits and the order of areas are agreed with the site team.
- Each opening is checked for wall or floor type, service, gap and depth.
- Foam, ordinary sealant and debris come out first.
- Backing and fire-rated sealant are installed to the detail and tooled.
- We tell you about openings that need a different product.
What we need from you
- Clear stock, furniture or equipment away from the joints
- Arrange parking or a loading space
- Share your working hours and any access restrictions
Getting a fixed quote
Pricing a project or setting a maintenance budget? We’ll quote against your scope and drawings you can plan around. If you have questions first, speak to us on 01277 525 020 or use the quote form.
Related advice
About our fire stopping in Belsize
We are commercial sealant applicators, CHAS accredited and a Constructionline member, with CSCS-carded applicators on site. We hold no third-party fire-stopping installer certificate. We install the specified fire-rated sealant to its tested detail, and our workmanship carries a 12-month guarantee. Site teams most often ask us about damaged fire seals in risers and voids and openings found when ceilings come down for a refit, across service gaps in risers, linear gaps at wall heads and cable penetrations. One point of contact handles commercial sealant work in Belsize from the first photos to the final walk-round, whether it’s one building or several.
For a smaller site near Belsize, we plan to do all the penetrations in one go, so send the specification and photographs first. We install to the specification and the manufacturer’s guidance, leaving design and sign-off with the designer and building control.
Guaranteed is the last step of every job. You get a 12-month guarantee on our workmanship, and the quote explains what it covers.
- Location
- Belsize (WD3, WD4)
- Region
- Hertfordshire
- Guarantee
- 12 months on our workmanship
- Quote
- A fixed quote before we start
- Telephone
- 01277 525 020
- Last updated
- 3 November 2026
When it isn’t the sealant
We check first that sealant really is the fix. It won’t put right:
- Construction that lacks the fire resistance the seal relies on
- Fire doors, dampers or other fire safety equipment
- Writing the fire-stopping specification
If in doubt, phone 01277 525 020 or email a schedule or drawings and we’ll say what we think before you book.
What we seal
- Linear gaps at wall heads
- Cable penetrations
- Service gaps in risers
- Small duct penetrations where the tested detail allows
- Pipe penetrations
- Joints between fire-resisting walls and floors
Leave it or put it right?
The longer openings stay, the more there tend to be: every new cable or pipe adds another. A schedule that is dealt with regularly stays manageable. Halls, stores and units around places like Belsize may not be checked every day, which gives a failed joint time to do damage. Resealing early avoids that.
Access often affects the price as much as the sealing: easy-to-reach joints are quicker than those that need equipment to get to. Tell us how the joints are reached and call for a quote.
Why clients in Belsize choose us
- Our applicators hold CSCS cards
- One contact handling all your sites
- Commercial sealant work since 2005
- 12-month guarantee on workmanship
See what affects the cost or our accreditations and insurance.
Site staff or a sealant specialist?
For a quick touch-up, site staff may be fine, but anything bigger is another matter: a specialist brings efficiency, a consistent finish and a 12-month guarantee.
The visible bead is only part of the job. Backing rod, primer where specified and a joint designed to move with the building are easy to get wrong without experience.
Places near Belsize
Other services in Belsize
Quoting for work in Belsize
Each job is priced on its own details. The main factors are:
- Which sealant the job calls for
- How accessible the joints are
- Site requirements such as inductions and permits
- Backing rod, priming and other preparation
Cost follows what’s involved: stripping out, preparation, sealing, access and phasing. Call for a quote and we’ll explain how it’s made up.
Details that help us quote
There’s no need for a formal survey. These details are enough to start:
- Whether an asbestos survey exists
- Drawings or a marked-up plan, if available
- The site address and postcode
- Anything awkward about access or site hours
Specifications, drawings and tender packages are welcome with any enquiry, and we’ll price the work to it. For smaller jobs, photos and a description will do.
Common problems we fix in Belsize
Linear gaps fail where a fire-resisting wall meets a slab, soffit or another wall. Movement in the frame or slab can open the joint, and the wrong product can split as a result. The tested detail for a linear joint states the width and movement it covers.
Site and facilities staff are often the first to spot these:
- Service penetrations left open after M&E works
- Fire-rated sealant that has cracked or shrunk back
- Open linear gaps along the top of fire-resisting walls
- Builders’ foam or ordinary silicone in compartment walls
For a building such as Church of St Paul, new heating or data runs are the usual reason penetrations need sealing.
What your quote should include
- How the joint faces will be prepared and primed
- Will failed sealant be removed rather than covered?
- Can the work be phased to keep areas open?
- The named product and why it was chosen
Questions about Belsize
Can you work at a site such as Kings Park Industrial Estate, by Belsize?
Yes. Estates, retail parks and business parks around Belsize, Kings Park Industrial Estate among them, are all within reach. Send details of the unit and the work through our quote form for a quick quote.
What does the BS 476 change mean for fire-rated sealant in Belsize?
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 the work guaranteed?
Yes, for 12 months. If a joint fails because of how we installed it, we come back and put it right.
How long does a typical visit take?
The duration is planned around your programme and the access we’re given. We will give you an estimate of time on site when we quote.
What will the job cost?
That depends on the job: quantities, access, the product and any phasing. Call for a fixed quote and we’ll price it properly.
Can you quote from photos?
That depends on the size and complexity of the job. Simple work can often be priced from photos, and bigger or more complex jobs usually get a visit.
How do you deal with asbestos in old sealant?
Managing asbestos is the dutyholder’s responsibility, so for older buildings we ask for the asbestos register first. Work pauses if suspect material is found, until it has been tested.
Compartments and services around Belsize
Central London is about 22 miles from Belsize. Business park offices in the commuter belt are refitted as tenants change, and each fit-out adds services through compartment walls. Fire stopping of openings and penetrations in England falls under Approved Document B. Its BS 476 references are being withdrawn from 2 September 2029, with BS EN 13501-2 classification taking over, subject to transitional arrangements. What we install is set by the specification, and it goes in to the tested detail.
Large healthcare estates like Hemel Hempstead Hospital, 4 miles to the north of Belsize, change their services often, so penetration seals are worth checking after M&E work. On estates like Kings Park Industrial Estate, 2.9 miles to the north-east of Belsize, the wall between office and warehouse is often fire-resisting, and cables through it need the specified seal.
Belsize is about 3 miles north of Chorleywood, in Hertfordshire. If you are looking for fire stopping in Belsize, we can help, as we do across Hertfordshire. Across Hertfordshire, 371 places are covered, including Belsize. We also cover London, around 22 miles from Belsize.
Commercial sites across WD3 and WD4 are covered. For a building on Plough Lane, Bragmans Lane and Poles Hill or nearby, we can quote for service penetrations. We also cover Flaunden (1 mile west), Chenies (2 miles south-west), Latimer (2 miles south-west), Chorleywood (3 miles south) and Little Chalfont (3 miles south-west). Bigger towns within reach include Watford (5 miles south-east), Hemel Hempstead (4 miles north-east), St Albans (8 miles north-east), Welwyn Garden City (15 miles north-east), Harpenden (11 miles north-east) and Hatfield (12 miles east).
Landmarks near Belsize
In Belsize, that means premises near Two Brewers Inn and Kings Langley School, among other places. For rail, the closest station is Kings Langley station, about 2.9 miles east. Well-known places in the area include Hemel Hempstead Hospital (4 miles north). The countryside around Belsize includes Sarratt Bottom nature reserve.