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

Fire-rated sealing and fire stopping in West Dulwich, Greater London

We carry out fire-rated and intumescent sealing of service penetrations and linear gaps in West Dulwich and the surrounding area. Send details for a fixed quote.

  • Unsealed joints where partitions meet the slab
  • Fire seals cut back for extra cables and never reinstated
  • Old intumescent sealant that has split away
1
Send details
Send the specification, photos or a marked-up plan.
2
Get a quote
A fixed quote for the work, with the scope in writing.
3
We seal
CSCS-carded applicators, the right product for each joint.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
South East, London & Scotland
Constructionline member
Fully insured: £5m PL

Fire stopping near West Dulwich

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

Should maintenance staff do it?

Paperwork matters too. Main contractors and clients often ask for CSCS cards, RAMS and insurance details, and we’ll confirm the paperwork you need with the quote.

For most general trades, sealant is a sideline. A specialist brings correct preparation, depth control with backing rod and a product suited to that particular joint, which is what makes a joint last.

How we handle fire stopping in West Dulwich

No fire sealant works on its own: the evidence covers a specific product, wall or floor type, service, gap, depth and backing. We match each opening to that detail before any sealant goes in, and raise it with you if it falls outside. If you’re dealing with hidden openings found during inspections and old intumescent sealant that has split away, we can help. Facilities teams, main contractors and managing agents in West Dulwich tend to want the same three things: a clear scope, tidy work and joints that don’t fail again.

Taller residential buildings in London may fall under the Building Safety Act’s higher-risk regime, where fire-stopping records get close attention. We install what the designer or fire engineer has specified, and if you need records of the work, tell us and we’ll confirm with the quote.

The 12-month guarantee covers our workmanship: the preparation, the sealing and the tooling. It doesn’t extend to damage, other trades’ later work or movement the joint was never designed to take.

The Mastic Doctor team standing beside their branded vans outside an office building
Place
West Dulwich (SE21, SE27, SE19)
Wider area
Greater London
Guarantee
12 months on our workmanship
Quote
A fixed quote before we start
Phone
01277 525 020
Page updated
3 November 2026

What sets the cost

To price the job, we consider:

  • Specialist products, such as fire-rated or hygienic sealants
  • How much there is to seal
  • Travel to remote or island sites
  • How much existing material needs removing

Every site prices differently: the joint sizes, the specified product, access and working hours each have a bearing. Send the details and a fixed figure follows.

What we need to price the job

However big the job, the same details help:

  • Clear photographs of the problem areas
  • Whether an asbestos survey exists
  • Whether the building will be occupied during the work
  • 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, photographs and a description will do.

What we are called out for in West Dulwich

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, so it has to come out.

Most enquiries start with something like this:

  • Service penetrations left open after M&E works
  • Openings found when ceilings come down for a refit
  • Head-of-wall gaps with no fire seal
  • Fire-stopping items raised at inspection or handover

Tenant changes at centres like Bell Green Retail Park, 2.2 miles to the east of West Dulwich, often mean new services through walls between units.

Before you book anyone

  • Whether primer will be used where the manufacturer specifies it
  • How the existing material will be dealt with
  • Their pre-qualification and accreditations
  • Will CSCS-carded applicators be on site?

Questions to ask before you appoint anyone

Compartment walls and floors in West Dulwich

For England, the fire stopping of penetrations is dealt with in Approved Document B. The national BS 476 classes are due to drop out of it from 2 September 2029, leaving the European BS EN 13501-2 route, subject to transitional arrangements. Either way, we install the specified product to its tested detail. Several hotels sit less than 2 miles from West Dulwich. Bedroom-to-corridor walls in hotels are normally fire-resisting, so new cabling or pipework through them has to be sealed to the tested detail.

Where a unit on an estate such as Hamilton Road Industrial Estate, less than half a mile south-west of West Dulwich, has fire-resisting walls between offices and warehouse, any new service through them should be sealed to the tested detail. For a hospital such as British Home & Hospital for Incurables, which lies south-west of West Dulwich, penetration sealing is normally phased ward by ward, with infection-control rules agreed first.

West Dulwich is about 1 mile north-east of West Norwood, in Greater London. We send applicators to West Dulwich for service penetrations. West Dulwich is one of 764 places in Greater London on our list.

We cover the SE21, SE27 and SE19 postcode districts. If your site is on Berry Lane, Clive Road and Myton Road or close by, we can quote for service penetrations. West Dulwich sits on or close to the A2199, useful when we plan access and materials. We also cover Sydenham Hill (1 mile east), West Norwood (1 mile south-west), Gipsy Hill (1 mile south), Dulwich (1 mile north) and Upper Norwood (1 mile south). Further afield, our area takes in London (5 miles north), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (7 miles north-west), St Pancras (7 miles north) and Shoreditch (6 miles north).

Around West Dulwich

In West Dulwich, that means premises near The Wood House, Dulwich Prep & Senior and Kingsdale Foundation School. There’s a railway station in West Dulwich itself: Sydenham Hill station. Well-known places in the area include British Vintage Wireless And Television Museum (less than half a mile west) and St Christopher's Hospice (1.3 miles south-east). Not far away are Battersea Park Lake and Dulwich Upper Wood.

Map of West Dulwich © OpenStreetMap contributors

Your questions answered

Can you work at a site such as Hamilton Road Industrial Estate, by West Dulwich?

Yes. Estates, retail parks and business parks around West Dulwich, Hamilton Road Industrial Estate among them, are all within reach. A few photographs and the unit address let us price the work.

Will you plan work around the academic year at somewhere like King's College London?

Yes. Education sites typically want the work in vacations or in phases during term, and we plan to suit. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.

Do you work in Scotland as well as England?

Our work covers Greater London, the South East and every Scottish council area. In Scotland, clause 2.1.14 of the non-domestic Technical Handbook says service penetrations should keep at least the fire resistance of the wall or floor.

Will you quote for a small job?

Small jobs are welcome alongside larger packages. Send details for a fixed quote.

Who decides which product is used?

Where there’s a specification, we use the product it names. If not, we choose for the movement, the surfaces and the conditions, in line with the manufacturer’s guidance.

How do you deal with asbestos in old sealant?

Some older mastics, especially in pre-2000 buildings, can contain asbestos. We check the asbestos register before cutting out old sealant in an older building, and work stops until any suspect material has been tested. We don’t remove asbestos-containing materials.

Can you send site paperwork?

Let us know which documents the site needs, such as RAMS, an insurance certificate or CSCS details, and we will confirm them with the quote.

Aftercare for building managers

Your facilities or cleaning team can help the joints last. Pass these on to them:

  • Check with the data sheet before painting over fire sealant
  • Have penetrations checked while they can still be seen
  • Include service cupboards in routine inspections
  • Settle who seals which penetrations at the start of a project

After every round of M&E works, check that the openings created have been sealed. A short check at the end of each job saves a long hunt later.

Ask every contractor who works in risers or voids to report openings they create. Small habits like this stop openings building up.

Leave it or put it right?

A seal that doesn’t match its tested detail gives false comfort. The fix is to remove it and reinstall to the detail. Access in London is hard enough to arrange once, so it makes sense to deal with every failing joint while access is in place.

What a job costs comes down to how many linear metres there are, what has to come out first and the access. Call for a quote once you have the details.

Why clients in West Dulwich choose us

  • Public liability insurance in place
  • Failed material removed, not covered up
  • One phone line for London, the South East and Scotland
  • Workmanship guaranteed for 12 months

Read our cost guide and our accreditations.

How a job runs

Before we leave any area, we remove the tape, clean down and inspect every joint, ready for your sign-off. If an area should be left alone while the sealant cures, we say how long and put signs out. The ULEZ covers the whole of Greater London, and parking near a job is rarely simple. Let us know about any on-site parking or loading arrangements when you send the job details.

  1. We read the specification, drawings or penetration schedule you send and ask about anything unclear.
  2. Every penetration is compared with its detail: wall or floor type, service, gap size and depth.
  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. We apply the specified sealant to the depth and around the services as the detail shows.
  6. If an opening needs something other than sealant, we tell you instead of improvising.

Before we start on site

  • Let building users know which areas are affected
  • Send any specification or drawings in advance
  • Tell us what induction or permit system the site runs

Quotes

Every job follows the same four steps: send details, get a quote, we seal, guaranteed. To take the first step, call 01277 525 020 or email drawings and photos.

Ask for a quote

Related advice

Accreditations

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