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

Fire-rated sealing and fire stopping in Isle of Dogs, Greater London

Planning work on a service penetration in Isle of Dogs? We look at it, seal it with the right product and hand it over with a 12-month guarantee.

  • Expanding foam used as fire stopping
  • Fire stopping installed outside its tested range
  • Unsealed penetrations discovered above suspended ceilings
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
Failed joints cut out, faces prepared, new sealant laid.
4
Guaranteed
12-month guarantee on our workmanship.
London, the South East & Scotland
CHAS accredited
£5m PL insurance

Fire stopping for businesses in Isle of Dogs

Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.

Fire stopping in Isle of Dogs

Facilities managers in Isle of Dogs often find open service penetrations when ceilings come down for other work. If a specification already covers those walls and floors, we can reseal to it using the product and detail it sets out. With no specification in place, the first step sits with your designer or fire engineer, not with us. If you are dealing with non-fire-rated filler around services and penetration schedules that need working through, we can help, on joints between fire-resisting walls and floors, linear gaps at wall heads and cable penetrations alike. A single leaking joint is often how a building in Isle of Dogs first comes to us: we look at the rest while we’re there and tell you what we find.

After a fit-out or new cabling in a London building, risers and ceiling voids are where open service gaps tend to be found. Fire-rated sealant goes in where it’s the specified item; where a collar, wrap or batt is called for instead, we flag it.

Whoever the client is, the cover is the same: a 12-month guarantee on our workmanship. Faults in the structure, damage and other trades’ work fall outside it, and we say so plainly.

Where
Isle of Dogs (E14, SE8, SE10)
Region
Greater London
Cover
12 months on every job
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

Why act early in Isle of Dogs

Inspections and handover checks often pick up fire stopping. Late discoveries can delay handover while openings are reopened and resealed. In a London building, a failed joint rarely affects only one party. Putting it right early is less disruptive than dealing with the consequences.

The price depends on the quantity of joints, what has to come out first and the access. Call for a fixed quote when you are ready.

What you get with us

  • Fully insured, including public liability cover
  • 12-month guarantee on workmanship
  • Specification-led, product-correct work
  • Over 20 years of commercial sealing

Take a look at what affects the cost or how we’re accredited.

Questions about Isle of Dogs

Do you cover business parks and estates near Isle of Dogs, such as Brookmarsh Industrial Estate?

Yes. Our area takes in Isle of Dogs and its surroundings, with estates and business parks such as Brookmarsh Industrial Estate included. Photos and a short description are enough for a first look.

Is a hospital such as Blackheath Hospital somewhere you can work?

Yes, hospitals are one of the sectors we cover. We follow the site’s permits, sign-in and infection-control procedures in every area.

Do you design or specify fire stopping?

No, that isn’t our role. Once you have a specification, we can price and install the sealant elements of it and point out anything needing another product.

Do you have public liability insurance?

Yes. Our insurance certificate can be sent alongside the quote.

Do you have third-party installer accreditation for fire stopping?

No, and we won’t imply otherwise. Third-party schemes aren’t a legal requirement, but many clients and main contractors ask for them, so check your contract first. If it doesn’t require one, we can install the specified fire-rated sealant to its tested detail.

Is the BS 476 change in 2029 relevant to fire stopping?

It mainly affects England, where Approved Document B is dropping its BS 476 references from 2 September 2029. Products are then judged on BS EN 13501-2 classifications, subject to transitional arrangements. Scotland follows its own Technical Handbook.

Do you take on small jobs?

We quote for single jobs as well as large packages and programmes. Photos and a description are enough to start.

Owners, agents and contractors

Hotels, schools, healthcare sites, offices and retail units book us directly too. We plan around the way the building is used, so the building keeps working while we do.

As a CHAS accredited contractor and Constructionline member, we’re straightforward to vet for your supplier list. We are fully insured, and our insurance certificate can go with the quote.

Maintenance after handover

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

  • Have penetrations checked while they can still be seen
  • Foam or ordinary sealant is never a fire-seal repair
  • Keep product data and details in the fire safety file
  • Brief every trade that openings they make must be sealed

Add risers, plant rooms and ceiling voids to routine fire-stopping checks. Look for cracks, unsealed new cables and gaps that have been enlarged, and report them promptly.

Ask every contractor who works in risers or voids to report openings they create. It costs little and catches breaches early.

Fire-rated sealing for Isle of Dogs buildings

The 2 miles around Isle of Dogs include three care or nursing homes. In a care home, any new pipe or cable through a fire-resisting wall should be sealed to the specified detail. In England, Approved Document B covers fire stopping of openings and penetrations. Its BS 476 references are being withdrawn from 2 September 2029, with BS EN 13501-2 classification taking over, subject to transitional arrangements. What we install is set by the specification, and it goes in to the tested detail.

In a retail centre such as New Cross Gate Retail Park, 1.3 miles south-west of Isle of Dogs, any fire-resisting wall between units that is crossed by new services needs sealing to the tested detail. Hospital estates such as Blackheath Hospital, 2.1 miles to the south-east of Isle of Dogs, are divided into fire compartments, and any service penetration through them should be sealed to the specified, tested detail. Campus buildings at universities such as University of Greenwich - Greenwich Campus (0.7 miles south-east of Isle of Dogs) see constant changes to data and services, and fire-rated sealant goes in around new penetrations where it is specified.

Isle of Dogs is about 1 mile north-west of Greenwich, in Greater London. If you are looking for fire stopping in Isle of Dogs, we can help. Across Greater London, 764 places are covered, Isle of Dogs among them.

Commercial sites across E14, SE8 and SE10 are covered. Buildings on Creek Road, Wynan Road and Undine Road are within our area for service penetrations. Nearby places we also cover include North Greenwich (1 mile north-west), Millwall (1 mile west), Cubitt Town (1 mile north-east), Deptford (1 mile south-west) and Greenwich (1 mile south-east). A short drive away, we cover London (3 miles west), City of Westminster (6 miles west), Marylebone (6 miles west), Kensington (8 miles west), St Pancras (5 miles north-west) and Shoreditch (4 miles north-west).

Near you in Isle of Dogs

Locally, jobs take us to sites close to The Ferry House Public House, Laban Centre and St. Paul's and the streets around them. Also close by are Mudchute Park and Farm (less than half a mile north-east) and Canary Wharf College 3 (less than half a mile north). Isle of Dogs’s nearest station is Greenwich station, about 0.7 miles south. Nearby you’ll also find Greenwich Castle (1 mile south-east) and Surrey Quays Shopping Centre (1.3 miles west). The countryside around Isle of Dogs includes Tower Hill and Sue Godfrey Nature Park.

Map of Isle of Dogs © OpenStreetMap contributors

What sealant work can’t fix

Sealant solves a lot, but not everything, and we are upfront when that’s the case. It won’t fix:

  • Deciding what a wall or floor needs, which belongs to the designer
  • Large openings beyond what any sealant detail covers
  • Fire doors, dampers or other fire safety equipment

Not sure which it is? You can call the office on 01277 525 020 or send photos by email and we’ll tell you honestly.

Where we work in Isle of Dogs

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

Diagnose, treat, sign off

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. All of Greater London is in the ULEZ, and kerbside space in Isle of Dogs can be scarce. If there’s a loading bay, a car park or a permit we can use, tell us when you send details.

  1. We start with your penetration schedule, drawings or specification.
  2. Access, permits and the order of areas are agreed with the site team.
  3. Each opening is checked for wall or floor type, service, gap and depth.
  4. Unsuitable material is removed and the opening cleaned so the seal starts clean.
  5. The specified backing and sealant go in to depth and are finished neatly.
  6. We tell you about openings that need a different product.

Getting the site ready

  • Arrange parking or a loading space
  • Agree which areas must stay open
  • Tell us your opening times and when work is allowed

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 ask for one, phone 01277 525 020 or send photos by email.

Ask for a quote

Advice

How the quote is worked out

Sealant work doesn’t have a standard rate, since sites vary so much. What we take into account:

  • Which sealant the job calls for
  • Joint width, depth and condition
  • Site requirements such as inductions and permits
  • Removal of failed or old sealant

We don’t publish prices, because the scope varies so much from one building to the next. Call for a quote.

Details that help us quote

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

  • Asbestos survey details if the building is older
  • Any specification or named product
  • How the joints are reached, and at what height
  • Where the site is, with the postcode

For a fixed quote, give us a call on 01277 525 020 or email us, telling us the site location and the nature of the job. You can also send details through our quote form.

Accreditations

Trusted. Accredited. Insured.