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

Fire-rated sealing and fire stopping in Staples Corner, Greater London

Fire-rated and intumescent sealing of service penetrations and linear gaps throughout Staples Corner and nearby, carried out by CSCS-carded applicators. CHAS accredited and fully insured.

  • Expanding foam used as fire stopping
  • Hidden openings found during inspections
  • Unsealed openings around new pipes and cables
1
Send details
Tell us about the site, with photos if you have them.
2
Get a quote
One fixed quote covering the agreed scope.
3
We seal
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
London, the South East & Scotland
Constructionline member
£5m public liability

Fire stopping for Staples Corner sites

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

How we handle fire stopping in Staples Corner

Fire-rated sealant suits many small service penetrations: copper and steel pipes, cables and some small ducts where the tested detail allows. Larger openings and some plastic pipes call for collars, wraps, batts or boards instead. If the detail calls for something other than sealant, we say so rather than force sealant into it. We work on joints between fire-resisting walls and floors, linear gaps at wall heads and small duct penetrations where the tested detail allows, and the usual reasons a site gets in touch are fire sealant pulled out of the opening and non-fire-rated filler around services. Whether you call it commercial sealant work, mastic application or joint sealing, in Staples Corner it comes down to the same thing: the right product in a properly prepared joint.

In a London area such as Staples Corner, 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.

The 12-month guarantee is for workmanship rather than wear and tear. Sealant wears with time, and movement, weather, cleaning and use decide how fast, so we spell out the cover before we begin.

The Mastic Doctor team standing beside their branded vans outside an office building
Location
Staples Corner (NW2, NW4, NW9)
Wider area
Greater London
Cover
12 months on our workmanship
Price
Quoted before any work starts
Call
01277 525 020
Last updated
3 November 2026

Why deal with it now?

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 and avoids a much larger catch-up later. Failed sealant in a building in Staples Corner can quickly affect neighbours, tenants or the floor below: water travels through shared structures, and a small leak becomes a dispute between occupiers. Putting it right early is less disruptive than dealing with the consequences.

Larger quantities, tricky access or phasing all shape the price. So do site requirements such as inductions and permits.

Why appoint us

  • Fixed quotes based on photos, drawings or a visit
  • Our applicators hold CSCS cards
  • Health and safety: CHAS accredited
  • Fully insured, including public liability cover

See what affects the cost and how we’re accredited.

How the quote is worked out

Each job is priced on its own details. The things that drive the figure:

  • Which sealant the job calls for
  • Joint width, depth and condition
  • The total length or number of joints
  • Any access equipment needed

The price depends on how many linear metres there are, what has to come out first and the access. Call for a quote when you’re ready.

Sending details for a quote

Good information means a firmer quote. When you get in touch, include:

  • Your programme or deadline
  • Photos of the joints, close up and from further back
  • Approximate linear metres or a joint schedule
  • How the joints are reached, and at what height

Every quote starts with the facts: what’s there, how much of it, how we reach it and what’s specified. Share whatever details you have and we’ll fill any gaps with a visit.

What sealant work can’t fix

Honesty saves time and money. New sealant won’t cure:

  • Construction that lacks the fire resistance the seal relies on
  • Fire doors, dampers or other fire safety equipment
  • Issuing fire ratings or certificates for seals

If you’re not sure, just ring 01277 525 020 or send details through our quote form and we will give you a straight answer before you book.

Joints and surfaces we work on

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

Service penetrations in Staples Corner buildings

In London buildings, frequent fit-outs and M&E changes are a common reason fire stopping gets breached. We install fire-rated sealant where it is specified and work within the building manager’s permit system. There are plenty of hotels within about 2 miles of Staples Corner. 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.

On a hospital site such as BMI Hendon Hospital, which lies north of Staples Corner, fire-rated sealant goes in where the specification calls for it, with the work planned around the estates team’s permits. For an estates team at a campus like Middlesex University, which lies north of Staples Corner, summer M&E works are typically followed by a round of penetration sealing.

Staples Corner is about 1 mile south of Hendon, in Greater London. We cover Staples Corner and the rest of Greater London, and jobs here get the same fixed quote and 12-month guarantee as anywhere else. 764 places across Greater London fall within our area, Staples Corner among them. Our London page has more on work in that area.

Work on service penetrations is covered throughout NW2, NW4 and NW9, whatever the building. We cover commercial and managed buildings on Park Road, Humber Road and Oxgate Lane. If your building is just outside Staples Corner, we cover Brent Cross (1 mile north-east), Dollis Hill (1 mile south-west), Hendon (1 mile north), The Hyde (1 mile north-west) and West Hendon (1 mile north-west). Further afield, our area takes in London (8 miles south-east), City of Westminster (5 miles south-east), Marylebone (5 miles south-east), Kensington (5 miles south), St Pancras (6 miles south-east) and Shoreditch (7 miles south-east).

Local landmarks in Staples Corner

We work on buildings around Clarefield Park, Clarion and Woodfield School. Staples Corner has its own railway station: Brent Cross West station. Nearby you’ll also find St Andrew's Hospital (0.7 miles south) and Church Farmhouse Museum (1.3 miles north). The countryside around Staples Corner includes Westbere Copse and Darland's Lake.

Map of Staples Corner © OpenStreetMap contributors

Questions about Staples Corner

Can you seal around new services in a hotel near Staples Corner?

Yes, where fire-rated sealant is the specified product. Each seal follows the tested detail, and rooms are done in turn.

Will you take on work at estates like Brent Cross Shopping Park, close to Staples Corner?

Yes. Estates, retail parks and business parks around Staples Corner, Brent Cross Shopping Park among them, are all within reach. To start, just call 01277 525 020 or send details through our quote form with the unit, the joints involved and your access times.

What will the job cost?

Every job gets its own fixed quote. For yours, call the office on 01277 525 020 or email drawings and photos.

Do you offer coloured sealant?

It depends on the product specified. Some ranges are wide, others limited, so we’ll confirm the colours available for the specified product with the quote.

Do you cover Staples Corner?

Yes. Staples Corner is in our area, within our coverage of Greater London, South East England and Scotland. To discuss a job, call the office on 01277 525 020 or email drawings and photos.

Do you need to see the site first?

It depends on the job. Simple work can often be priced from photos, and bigger or more complex jobs normally get a visit.

What happens if old sealant might contain asbestos?

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.

Work for main contractors and building owners

For main contractors, we work as the sealant subcontractor on new-build and refurbishment projects. We work to your programme, your specification and your site rules.

FMs need a contractor who is easy to get on site. Tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we’ll confirm with the quote.

When to call us in Staples Corner

Some service penetrations were never sealed at all because they sat out of sight above a ceiling or inside a riser. Inspections, refurbishments and ceiling access typically bring them to light.

These are often picked up first by site or facilities staff:

  • Seals that don’t match their tested detail
  • Unsealed joints where partitions meet the slab
  • Seals disturbed by maintenance and left open
  • Fire-rated sealant that has cracked or shrunk back

Refits at places like Brent Cross Shopping Park (to the east of Staples Corner) often reroute services through walls between units.

What your quote should include

  • Their pre-qualification and accreditations
  • Will failed sealant be removed rather than covered?
  • How the joint faces will be prepared and primed
  • What site paperwork they can supply

How to choose a sealant contractor

Diagnose, treat, sign off

Site rules come first: signing in, inductions and any permit to work. With the paperwork done, we take the joints in the sequence agreed with you, and each area is checked before we leave it. 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 raise any questions before we price.
  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. Openings that need a collar, wrap, batt or other product are flagged to you rather than filled with sealant.

Preparing the site

  • Tell us your opening times and when work is allowed
  • Flag any permit to work we will need
  • Let building users know which areas are affected

Request a quote

Photos, drawings or a schedule of the joints and a fixed quote comes back to you. Where a site visit makes more sense, we’ll arrange one.

Get a quick quote

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Accreditations

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