The Mastic Doctor team standing beside their branded vans outside an office building
Greater London · England

North Cheam fire stopping

Need fire stopping in North Cheam? Send us the details for a fixed quote, backed by a 12-month guarantee on the work.

  • Unsealed joints where partitions meet the slab
  • Fire seals cut back for extra cables and never reinstated
  • Service penetrations left open after M&E works
1
Send details
Tell us about the site, with photos if you have them.
2
Get a quote
Scope agreed and priced before anything starts.
3
We seal
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
Signed off, with 12 months’ guarantee.
London, the South East & Scotland
CHAS accredited
Fully insured: £5m PL

Fire stopping near North Cheam

Photos, a specification or a quick description of the joints is enough to start a fixed quote.

Fire stopping in North Cheam

Most of our fire stopping work happens after the building is up. New cable runs, replaced pipework and extra data routes all punch holes in compartment walls. Those on your schedule are closed with the specified product. Most enquiries involve openings left by services added after handover and hidden openings found during inspections, on cable penetrations, service gaps in risers and pipe penetrations. A single leaking joint is often how a building in North Cheam first comes to us: we check the joints around it and give you an honest view of what needs doing now and what can wait.

London has many occupied offices, blocks and mixed-use buildings where services are added and rerouted all the time. Each service penetration gets fire-rated or intumescent sealant if that’s what is specified, laid to the product’s tested arrangement.

Every job is signed off with a 12-month guarantee. The promise is simple: if the work we did fails within twelve months, we return to fix it.

The Mastic Doctor team standing beside their branded vans outside an office building
Location
North Cheam (SM3, KT4, SM1)
Region
Greater London
Guarantee
A 12-month guarantee
Quote
A fixed quote before we start
Telephone
01277 525 020
Last updated
3 November 2026

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 move on in phases so staff and visitors can carry on around us. In North Cheam, most buildings stay in use during the work, so we agree zones and timings with the building or facilities manager. Areas are handed back as each section is finished.

  1. We read the specification, drawings or penetration schedule you send.
  2. On site, each opening is checked against the tested detail it is meant to follow.
  3. Unsuitable fillers and loose debris are taken out of each opening.
  4. We fit the backing the detail asks for, to the stated depth.
  5. Fire-rated or intumescent sealant is gunned in to the specified depth, then tooled.
  6. If an opening needs something other than sealant, we tell you instead of improvising.

What we need from you

  • Agree which areas must stay open
  • Explain the parking and delivery arrangements
  • Make sure the joints can be reached

Request a quote

We quote a fixed sum against the scope you give us, so you know the figure before anyone is on site. To start the process, call the office on 01277 525 020 or email a schedule or drawings.

Get a quick quote

Related advice

What sealant work can’t fix

A proper diagnosis includes knowing what sealant can’t do. You’ll hear from us if the cause turns out to be any of the following:

  • Fire doors, dampers or other fire safety equipment
  • Issuing fire ratings or certificates for seals
  • Gaps in walls that were never built as compartment walls

If in doubt, ring 01277 525 020 or email a schedule or drawings and we’ll say what we think.

Where we work in North Cheam

  • Linear gaps at wall heads
  • Service gaps in risers
  • Small duct penetrations where the tested detail allows
  • Joints between fire-resisting walls and floors
  • Cable penetrations
  • Pipe penetrations

Why it’s worth doing now in North Cheam

An open or wrongly sealed service penetration lets fire and smoke reach the next compartment much sooner than the building was designed for. Putting it right is normally a modest job when the openings are accessible. Left until ceilings are closed or a tenant moves in, the same work costs more access and more disruption. Repeat call-outs disrupt occupied London buildings, so cutting the old sealant out fully and doing it right once is the better route.

Pricing service penetrations depends on how many there are, their condition and the access, and any specification that applies. Call for a quote.

Why us?

  • Old sealant cut out, never sealed over
  • 12 months’ guarantee on every job
  • Specification-led, product-correct work
  • CHAS accredited contractor

Read how commercial sealant jobs are priced or how we’re accredited.

Signs you need fire stopping in North Cheam

Some seals fail because the wrong product went in: builders’ foam or ordinary silicone used to fill a hole. The opening looks sealed but has no fire test evidence behind it and has to be removed.

Any of the following is a good reason to get the joints checked over:

  • Head-of-wall gaps with no fire seal
  • Expanding foam used as fire stopping
  • Improvised or mixed-product fire seals
  • Snag lists that include open service penetrations

Campus buildings at universities such as University for the Creative Arts, 3.5 miles south-west of North Cheam, see constant changes to data and services, and fire-rated sealant goes in around new penetrations where it is specified.

What your quote should include

  • Their pre-qualification and accreditations
  • What site paperwork they can supply
  • Is the sealant right for the movement and the substrate?
  • Their plan for phasing and protecting the area

How to choose a sealant contractor

Fire stopping in North Cheam: the local picture

Fire stopping of openings and penetrations in England falls under 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. Either way, we install the specified product to its tested detail. Every new tenant in a London building tends to bring new cabling, and with it new holes through compartment walls. We install fire-rated sealant where it is specified and work within the building manager’s permit system.

Workshops and IT rooms at colleges like Sutton College of Learning for Adults (1.3 miles south-east of North Cheam) are re-serviced often, leaving penetrations to seal. For a hospital such as Queen Mary's Childrens' Hospital, which lies east of North Cheam, penetration sealing is normally phased ward by ward, with infection-control rules agreed first.

North Cheam is about 3 miles north-east of Epsom, in Greater London. We cover commercial sites throughout North Cheam, whether it’s a single job or part of a planned programme. We work across 764 places in Greater London, large and small. Our London page has more on work in that area.

Postcode districts covered here: SM3, KT4 and SM1 for service penetrations. Buildings on Glyn Road, Covey Road and Lloyd Road are within our area for service penetrations. Just outside North Cheam, we also work in Cuddington (1 mile south-west), Lower Morden (1 mile north), Sutton Common (1 mile north-east), Stoneleigh (1 mile south-west) and Morden (2 miles north). Further afield, our area takes in London (10 miles north-east), City of Westminster (10 miles north), Marylebone (11 miles north), Kensington (9 miles north), St Pancras (12 miles north) and Shoreditch (12 miles north-east).

Local landmarks in North Cheam

Recent enquiries here include premises near The Nonsuch Inn, Sutton College of Learning for Adults and Nonsuch Park. The nearest railway station is West Sutton station, about 0.8 miles south-east of the centre. Nearby you will also find Chessington Castle Hill (3.2 miles west) and St. Anthony's Hospital (0.6 miles north). The countryside around North Cheam includes Henman Hill and Derwent Floodwash.

Map of North Cheam © OpenStreetMap contributors

Owners, agents and contractors

We work for building owners and managing agents on everything from one building to a spread of sites around North Cheam. Several sites can go on one quote, so there’s one set of paperwork to deal with.

Hotels, schools, healthcare sites, offices and retail units book us directly too. The work is planned around how the building runs, so the building keeps working while we do.

FAQs: North Cheam

Can you work at a site such as Kimpton Industrial Park, by North Cheam?

Yes, sites like Kimpton Industrial Park are within our area, along with the rest of North Cheam. A few photographs and the unit address let us price the work.

Can you cope with the access rules in a London building?

Yes, we plan every London job around the building’s own access rules. The building manager’s rules go straight into our method. We allow for the ULEZ, which covers every borough

Can one quote cover more than one building?

Yes. Several buildings can share a single quote, with one point of contact across South East England, Greater London and Scotland.

What changes on 2 September 2029?

It mainly affects England, where Approved Document B is dropping its BS 476 references from 2 September 2029. Classification to BS EN 13501-2 becomes the expected evidence. In Scotland, the Technical Handbook sets its own guidance, with clause 2.1.14 covering service penetrations.

How long does a typical visit take?

The duration is planned around your programme and the access we’re given. We’ll give you an estimate of time on site when we quote.

Who decides which product is used?

Where there’s a specification, we use the product it names. Otherwise, we recommend a product to suit the joint’s movement, the substrate and the conditions, following the manufacturer’s guidance.

Can you fire stop behind the services contractors?

Yes. Send the schedule or marked-up drawings and the specified product details for a fixed quote. Work can run area by area behind the M&E trades.

Looking after the joints

Cleaning and maintenance staff play a part too. Pass these on to them:

  • Keep general-purpose fillers away from compartment walls
  • Record which product was used where
  • Put resealing into every M&E and fit-out package
  • Check with the data sheet before painting over fire sealant

Once the seals are in, tell other trades they exist and must not be disturbed. If a seal has to be opened for a new service, it should be reinstated to the same detail using the same product.

The simplest way to keep compartment walls intact is to plan fire stopping into every job that crosses them. Then the seal goes in while the area is open, not months later.

Accreditations

Trusted. Accredited. Insured.