Fire-rated sealing and fire stopping in Clapham, Greater London
Fire-rated and intumescent sealing of service penetrations and linear gaps throughout Clapham and nearby, by CSCS-carded applicators. CHAS accredited and fully insured.
- Expanding foam used as fire stopping
- Fire-rated sealant that has cracked or shrunk back
- Fire-stopping items raised at inspection or handover
Need fire stopping in Clapham?
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
How we handle fire stopping in Clapham
On a fit-out or refurbishment, we follow the services contractors floor by floor. To price a package, speak to us on 01277 525 020 or email us with the schedule or marked-up drawings alongside the manufacturer’s details. Tell us what records you need and we will confirm with the quote. If you have open linear gaps along the top of fire-resisting walls and fire stopping installed outside its tested range, we can put it right, on pipe penetrations, cable penetrations and small duct penetrations where the tested detail allows alike. Whoever orders the work in Clapham, the brief is usually the same: a clear scope, tidy work and joints that don’t fail again.
London has many occupied offices, blocks and mixed-use buildings where services are added and rerouted all the time. Where the specification names fire-rated sealant, it goes in exactly as the manufacturer’s test evidence shows for that wall or floor.
We sign every job off with a 12-month guarantee. The promise is simple: if our work fails within that year, we put it right.
- Location
- Clapham (SW4, SW8, SW9)
- Region
- Greater London
- Guarantee
- 12 months on every job
- Price
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Last updated
- 3 November 2026
After the work
Every sealant joint needs some looking after, and how long they last depends on how they’re treated. We suggest:
- Get seals inspected before ceilings and boxing close
- Keep general-purpose fillers away from compartment walls
- File the specified details where the next contractor can find them
- Ask the designer to confirm details early on refits
Keep the product data and installation details with the building’s fire safety information. Anyone resealing later needs to know which product and detail were used.
Specify fire stopping early on refits, not as an afterthought. Details can then be picked to suit the actual pipes, cables and ducts, and the work runs in step with the M&E.
How the quote is worked out
These are the things that shape the price:
- The site’s rules and procedures
- Phasing around occupants
- Which sealant the job calls for
- Backing rod, priming and other preparation
The product called for affects the cost, and so does the preparation, from cutting out to priming and backing rod. Access, phasing and site rules also count.
What we need to price the job
There’s no need for a formal survey. A few details are enough to get going:
- How the joints are reached, and at what height
- The postcode of the building
- Any specification or named product
- Asbestos survey details if the building is older
Every job follows the same four steps: send details, get a quote, we seal, guaranteed. To take the first step, give us a call on 01277 525 020 or email a schedule or drawings.
FAQs: Clapham
Can you cope with the access rules in a London building?
Yes. Booked loading bays, goods lifts and permit-to-work systems are normal for London jobs. Send the building rules and access times with your enquiry. The ULEZ covers the whole of Greater London, which we allow for
Can work at a site such as University of the Arts London fit around teaching?
Yes, holiday working periods are the norm on campus jobs. We are CHAS accredited and a Constructionline member, and paperwork such as RAMS is confirmed with the quote.
How long do sealant joints last?
There’s no fixed lifespan: movement, exposure, cleaning, traffic and the product all play a part. Treat them as maintenance items and inspect them regularly.
Is your workmanship covered by a guarantee?
Yes, for 12 months. If our installation fails in that time, we return and fix it.
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 photos and a postcode.
Do you offer coloured sealant?
Often, yes. Sealants are made in a wide range of standard colours, and matching to RAL references or nearby finishes is commonly requested. We’ll confirm the colours available for the specified product.
Do you seal on top of existing sealant?
No. Overlaying old sealant is a frequent cause of early failure, so everything comes out first.
Places near Clapham
What else we do in Clapham
What happens if it’s left?
Open penetrations multiply: every new cable or pipe adds another. Keeping on top of it after each round of works keeps the job small. Failed sealant in a building in Clapham can quickly affect neighbours, tenants or the floor below: water travels through shared structures, and a small leak becomes a dispute between occupiers. Dealing with it early is simpler for everyone.
The work involved drives the cost: stripping out, preparation, sealing, access and phasing. Call for a fixed quote.
Why choose Mastic Doctor in Clapham
- CHAS accredited contractor
- Our applicators hold CSCS cards
- Over 20 years of commercial sealing
- Fully insured
Take a look at what affects the cost or our accreditations.
For managing agents and facilities managers
Housing associations and managing agents often need work done across blocks and communal areas. Work can be phased so residents and staff keep access throughout, and each stage is agreed with your contact.
Agents, factors and owners’ representatives all follow the same route: send the details, accept a fixed quote, and we carry out and guarantee the work. Keys, access and contacts can be agreed in advance.
Our process
We schedule the visit to fit the site hours and access windows you give us. On the day, the work area is kept contained and tidy, and we check in with your contact before moving on to each new area. For a job in Clapham, access comes first. Give us the hours we can be on site and we will schedule to suit.
- 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 so the seal starts clean.
- The specified backing and sealant go in to depth and are finished neatly.
- We tell you about openings that need a different product.
Preparing the site
- Share the asbestos register for older buildings
- Have the specification and drawings to hand
- Point out any areas we must not close
Get a fixed quote
Let us know the site, the scope and your timescale, and we’ll put a fixed quote together. The easiest way is to call 01277 525 020 or email the details over.
Related advice
Service penetrations in Clapham buildings
Every new tenant in a London building tends to bring new cabling, and with it new holes through compartment walls. Where fire-rated sealant is specified, we install it to the tested detail under the building’s permit-to-work arrangements. For England, the fire stopping of penetrations is dealt with in Approved Document B. From 2 September 2029, BS 476 references are being taken out of Approved Document B, leaving BS EN 13501-2 classification as the route, subject to the Government’s transitional arrangements. Our part stays the same: the specified product, installed to its tested detail.
On estates like Ellerslie Square Industrial Estate, 0.7 miles south-east of Clapham, the wall between office and warehouse is often fire-resisting, and cables through it need the specified seal. At a college such as St Francis Xavier Sixth Form College (1.1 miles south-west of Clapham), checking penetration seals after summer M&E works is good practice.
Clapham is about 3 miles north of Streatham, in Greater London. Anywhere in SW4, it works the same way: send details, get a fixed quote, we seal, and the work is guaranteed. Across Greater London, 764 places are covered, Clapham among them.
Postcode districts covered here: SW4, SW8 and SW9 for service penetrations. Streets here include Grafton Square, Clapham High Street and Houghton Square. You’ll find Clapham on or near the B224 and B303, so getting applicators and materials to site is simple. Nearby places we also cover include Stockwell (1 mile east), Little Portugal (1 mile north-east), Clapham Park (1 mile south), South Lambeth (1 mile north-east) and Brixton (1 mile south-east). A short drive away, we cover London (3 miles north-east), City of Westminster (3 miles north), Marylebone (4 miles north), Kensington (4 miles north-west), St Pancras (4 miles north) and Shoreditch (5 miles north-east).
Around Clapham
We work on buildings around Lambeth Academy, Larkhall Park and Trinity Academy. There’s a railway station in Clapham itself: Clapham High Street station. Well-known places in the area include Baynard's Castle (3.5 miles north-east) and Harrods (2.6 miles north-west). For a walk, there’s Battersea Park Lake and Knight's Hill.
What we’re called out for in Clapham
Openings in fire-resisting walls usually appear when services are added or changed. New cabling, rerouted pipework or a data route drilled through a riser leaves an opening that nobody returns to. Over a few years of fit-outs, a wall can collect a lot of these.
It’s worth sending us details if you spot any of the following:
- Damaged fire seals in risers and voids
- Fire-stopping items raised at inspection or handover
- Unsealed openings around new pipes and cables
- Builders’ foam or ordinary silicone in compartment walls
For an estates team at a campus like University of the Arts London, 0.8 miles north-west of Clapham, summer M&E works are usually followed by a round of penetration sealing.
Before you book anyone
- Their public liability cover
- Their approach to joint depth and backing
- Can the work be phased to keep areas open?
- The terms of the workmanship guarantee