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

Fire-rated sealing and fire stopping in North End, Greater London

We carry out fire-rated and intumescent sealing of service penetrations and linear gaps in North End. Send photos or drawings for a fixed quote.

  • Seals that don’t match their tested detail
  • Openings left by services added after handover
  • Openings found when ceilings come down for a refit
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
Scope agreed and priced before anything starts.
3
We seal
Failed joints cut out, faces prepared, new sealant laid.
4
Guaranteed
Signed off, with 12 months’ guarantee.
South East, London & Scotland
CHAS & Constructionline
Fully insured: £5m PL

Need fire stopping in North End?

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

Cost factors for service penetrations

What shapes the price:

  • Specialist products, such as fire-rated or hygienic sealants
  • Any access equipment needed
  • How much there is to seal
  • Joint width, depth and condition

The product called for affects the cost, and so does the preparation. Access, phasing and site requirements come into it too.

What we need to price the job

A few photographs plus some basic facts will normally do. Please tell us:

  • Access details, including height
  • When you need the work done
  • Whether the building will be occupied during the work
  • The asbestos register, for older buildings

To get a fixed quote, give us a call on 01277 525 020 or send photos by email with the site address and an outline of the work. Our quote form is another easy route.

Fire stopping for commercial buildings in North End

For main contractors, our fire stopping package slots in after the M&E trades have finished in an area. We work from your penetration schedule or marked-up drawings alongside the manufacturer’s details. Tell us what records you need and we’ll confirm with the quote. Most enquiries involve unsealed joints where partitions meet the slab and builders’ foam or ordinary silicone in compartment walls, on small duct penetrations where the tested detail allows, joints between fire-resisting walls and floors and cable penetrations. Searching for sealant specialists in North End? We’ve been sealing commercial buildings since 2005, CHAS accredited and a Constructionline member.

In a London area such as North End, buildings are refitted often, and every new cable, pipe or duct through a fire-resisting wall or floor leaves a gap. Where the specification names fire-rated sealant, it goes in exactly as the manufacturer’s test evidence shows for that wall or floor.

We stand by our work with a 12-month guarantee. It covers how we prepared and applied the sealant, and we come back if anything isn’t right.

Place
North End (W14, SW6, SW5)
Region
Greater London
Guarantee
A 12-month guarantee
Quotes
Quoted before any work starts
Call
01277 525 020
Updated
3 November 2026
Mastic Doctor team members lined up next to their branded vans outside an office building

What the job involves on each surface

Cables and cable bundles

Single cables and small bundles are often within a fire-rated sealant’s tested detail. Bundle size, cable type and the space between cables all matter.

Drylining partitions

Holes in board are often cut larger than needed. An oversized hole may be outside the sealant’s range and we will tell you what the detail says instead.

Building owners, agents and FMs in North End

As a CHAS accredited contractor and Constructionline member, we make supplier vetting simple. Our insurance certificate can be sent along with the quote.

When you manage a building on behalf of an owner, you need clear quotes and clear reporting. You get a fixed quote, an agreed scope and a walk round at the end, plus a 12-month guarantee.

Compartments and services around North End

Approved Document B is the English guidance that covers fire stopping around openings and penetrations. 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. What we install is set by the specification, and it goes in to the tested detail. Every new tenant in a London building tends to bring new cabling, and with it new holes through compartment walls. We seal to the specification and the product’s tested detail, working within the building’s permits.

For an estates team at a campus like University of Westminster, 0.6 miles to the north of North End, summer M&E works are normally followed by a round of penetration sealing. Theatres, wards and plant rooms at sites like Charing Cross Hospital, 0.6 miles to the south-west of North End, all have compartment walls crossed by services. In a retail centre such as Kensington Arcade, 0.9 miles north-east of North End, any fire-resisting wall between units that is crossed by new services needs sealing to the tested detail.

North End is about 1 mile south of Kensington, in Greater London. If you’re looking for fire stopping in North End, we can help. North End is one of 764 places in Greater London on our list for service penetrations.

Postcode districts covered here: W14, SW6 and SW5 for service penetrations. Among the streets we cover are Sun Road, Star Road and Field Road. Close to North End, our area also takes in West Kensington (1 mile east), Brook Green (1 mile north-west), Fulham (1 mile south), Hammersmith (1 mile west) and Brackenbury Village (1 mile north-west). Bigger towns within reach include London (5 miles east), City of Westminster (3 miles north-east), Marylebone (3 miles north-east), St Pancras (5 miles north-east), Shoreditch (6 miles north-east) and Walthamstow (10 miles north-east).

Landmarks near North End

Recent enquiries here include premises near Seven Stars pub, Polish Library POSK in London and Avonmore Primary School. The nearest railway station is Kensington Olympia station, roughly 0.5 miles north. Well-known places in the area include Hammersmith Broadway (0.7 miles west) and Montfichet's Tower (4.8 miles east). For a walk, there’s WWT London Wetland Centre and Campden Hill.

Map of North End © OpenStreetMap contributors

When something else is needed

Sealant solves a lot, but not everything, and we’re upfront when that’s the case. These need a different solution:

  • 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

If in doubt, give us a call on 01277 525 020 or email a schedule or drawings and we will say what we think.

Surfaces we seal

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

Looking after the joints

Keep the joints in good shape with a few simple steps:

  • Get seals inspected before ceilings and boxing close
  • Make fire stopping part of every scope that crosses a fire-resisting wall
  • Keep general-purpose fillers away from compartment walls
  • File the specified details where the next contractor can find them

Allow the manufacturer’s stated cure time before boxing in or decorating. Some fire-rated sealants accept paint and some don’t, and the data sheet says which.

Keep a register of where seals are and what they are made of. When a new service goes through, everyone knows which product and detail to match, which saves guesswork.

Questions about North End

What happens to BS 476 references for fire stopping in North End?

Approved Document B loses its BS 476 references from 2 September 2029, and BS EN 13501-2 becomes the route, subject to transitional arrangements. Whichever applies, we install the specified product to its tested detail; the specification is for the designer to set.

Can you seal penetrations in a hotel in North End after a refit?

Yes, where fire-rated sealant is the specified product. Work is done room by room so the hotel keeps trading; design and sign-off stay with the designer and building control.

Can you fit around our working hours?

Mention the site’s hours and access windows in your enquiry, and we’ll plan around them. You can reach the office between 8am and 5pm, Monday to Friday.

Can one quote cover more than one building?

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.

Can you work while the building is occupied?

Yes, with some planning. We agree a sequence with your contact so just one area at a time is disrupted.

Are you CHAS accredited?

Yes. We’re CHAS accredited, we’re a Constructionline member and we use CSCS-carded applicators.

How long does a job like this take?

That varies with the scale of the job, but the work normally takes a single visit for a short list of penetrations, or a phased programme for a whole building. Larger or phased jobs take longer, and we will give you a timescale with the quote.

Our process

A typical day starts with protection: masking tape along the joint edges and sheeting over anything nearby. The work itself normally takes a single visit for a short list of penetrations, or a phased programme for a whole building, and we clear our waste as we work. For a job in North End, access comes first: booked loading, goods lifts, the building’s permit system and a spot to keep materials. Give us the hours we can be on site and we’ll schedule to suit.

  1. The specification and schedule come first, so we know which details apply.
  2. Access, permits and the order of areas are agreed with the site team.
  3. We compare every service penetration with its tested detail before sealing.
  4. Foam, ordinary sealant and debris come out so the seal starts clean.
  5. Backing and fire-rated sealant are installed to the detail and tooled.
  6. We tell you about openings that need a different product.

Before we start on site

  • Send any specification or drawings in advance
  • Move anything stored against the joints
  • Point out parking and an unloading spot

Getting a fixed quote

Pricing a project or setting a maintenance budget? We’ll quote against your scope and drawings that you can work with. If you have questions first, phone 01277 525 020 or use the quote form.

Get a quick quote

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