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

Fire Stopping in Single Street

Commercial sealant work in Single Street for contractors, FMs and building owners: fire-rated and intumescent sealing of service penetrations and linear gaps, quoted at a fixed price.

  • Old intumescent sealant that has split away
  • Head-of-wall gaps with no fire seal
  • Fire seals cut back for extra cables and never reinstated
1
Send details
Photos, drawings or a schedule, or we visit.
2
Get a quote
One fixed quote covering the agreed scope.
3
We seal
Failed joints cut out, faces prepared, new sealant laid.
4
Guaranteed
12-month guarantee on our workmanship.
South East, London & Scotland
CHAS accredited
£5m public liability

Fire stopping near Single Street

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

Owners, agents and contractors

Whether you’re a managing agent, a property factor or an owner’s representative: send the details, accept a fixed quote, and we carry out and guarantee the work. We can agree access arrangements and keyholder contacts beforehand.

We work for building owners and managing agents on sealant work across single buildings or whole portfolios. One quote can cover more than one site, so there’s one set of paperwork to deal with.

Fire stopping in Single Street, done properly

Opened ceilings and riser doors often reveal service openings nobody sealed. If a specification already covers those walls and floors, we can reseal to it, matching the product and detail it names. Where there isn’t one, the designer or fire engineer needs to set one first. We work on linear gaps at wall heads, small duct penetrations where the tested detail allows and pipe penetrations, and what we are called in for most is builders’ foam or ordinary silicone in compartment walls and unsealed joints where partitions meet the slab. One point of contact handles commercial sealant work in Single Street from the first photos to the final walk-round, whether it’s one building or several.

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.

We stand by our work: 12 months, guaranteed. That covers our preparation and application, and if something we did falls short, we return to it.

Mastic Doctor team members lined up next to their branded vans outside an office building
Location
Single Street (TN16)
Region
Greater London
Cover
12 months on every job
Quotes
A fixed quote before we start
Call
01277 525 020
Updated
3 November 2026

What we can’t put right

A few problems need another trade or a different fix, and we point that out rather than sealing over them:

  • Designing or specifying fire stopping, which sits with the designer or fire engineer
  • Openings that need collars, wraps, batts or boards rather than sealant
  • Reviewing a building’s overall fire safety

If you are not sure, just call the office on 01277 525 020 or email drawings and photos and we will give you a straight answer.

What we seal

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

Compartment walls and floors in Single Street

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. Fire stopping of openings and penetrations in England falls under Approved Document B. Its BS 476 references are being withdrawn from 2 September 2029, with BS EN 13501-2 classification taking over, subject to transitional arrangements. Our part stays the same: the specified product, installed to its tested detail.

At a healthcare site like Princess Royal University Hospital, 3.3 miles north of Single Street, new services through compartment walls are a constant, and each needs the specified seal. In a school such as Cudham Church of England Primary School, fire-rated sealant goes in around service penetrations where it is specified. Industrial units on estates such as Biggin Hill Airport Trading Estate, 1.3 miles west of Single Street, often separate offices from warehouse space with fire-resisting walls, and new services through them need the specified seal.

Single Street is about 5 miles south of Orpington, in Greater London. Single Street sits inside our coverage and the rest of Greater London, with the same fixed quotes and 12-month guarantee as everywhere else. We work across 764 places in Greater London, large and small. Sites around London have their own page, about 14 miles away.

Anyone looking for fire stopping in TN16 gets the same process as the rest of our area: send details, get a quote, we seal, guaranteed. For a building on Berry's Hill and Single Street or nearby, we can quote for service penetrations. Sites close to Single Street are covered too, including Berry's Green (1 mile south), Luxted (1 mile north-west), Cudham (1 mile east), Aperfield (1 mile south-west) and Horns Green (1 mile south-east). A short drive away, we cover London (14 miles north-west), Whitechapel (15 miles north-west), Stockwell (13 miles north-west), Orpington (5 miles north), Wimbledon (14 miles north-west) and Plaistow (14 miles north).

What’s near Single Street

We work on buildings around Charles Darwin School and The Old Jail Public House and the streets around them. The closest station to Single Street is Chelsfield station, about 3.3 miles north-east of the centre. Other landmarks nearby include Princess Royal University Hospital (3.3 miles north) and Crofton Roman Villa (3.9 miles north). Open spaces near Single Street include Betsom's Hill and Downe Bank.

Map of Single Street © OpenStreetMap contributors

Common questions from Single Street clients

Do you work in London buildings with loading restrictions?

Yes, we plan every London job around the building’s own access rules. Send the building rules and access times with your enquiry. All of Greater London is inside the ULEZ, and our planning allows for it

Can you work at a site such as Biggin Hill Airport Trading Estate, by Single Street?

Yes. Estates, retail parks and business parks around Single Street, Biggin Hill Airport Trading Estate among them, are all within reach. Send details of the unit and the work through our quote form for a quick quote.

Do you cover Single Street?

Yes. We cover Single Street, and you can phone 01277 525 020 or email the details over to get started.

Do you certify or sign off fire stopping?

No. Sign-off isn’t ours to give, and we don’t hold a third-party installer certificate. Our part is fitting the specified product to its tested detail, and any records you need can be confirmed with the quote.

How do you choose the sealant?

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.

How do you deal with asbestos in old sealant?

Managing asbestos is the dutyholder’s responsibility, so we will ask for the register before work on an older building. If anything suspect turns up, we stop until it’s tested.

Which standards are fire seals tested to?

In short, BS EN 1366-3 and 1366-4 are the fire tests and BS EN 13501-2 is how results are classified. An EI 60 seal kept its integrity and insulation for 60 minutes as tested.

What sets the cost

We price every job individually. The things that drive the figure:

  • Whether the work must be split into stages
  • Specialist products, such as fire-rated or hygienic sealants
  • Backing rod, priming and other preparation
  • Whether old sealant has to be cut out first

The work involved drives the cost: removing old material, preparing the joints, the product, the access and how the work is phased. Call for a fixed quote.

Before you send an enquiry

It doesn’t need to be a full survey. A few details are enough to get going:

  • Drawings or a marked-up plan, if available
  • What the building is and how it’s used
  • The postcode of the building
  • The asbestos register, for older buildings

Let us know the site, the scope and your timescale, and a fixed quote will follow. The easiest way is to speak to us on 01277 525 020 or send photos by email.

Why deal with it now?

Leave a penetration open and smoke and fire can cross into the next compartment far earlier than intended. While the openings can be reached, sealing them is normally straightforward. Wait until ceilings close or areas are occupied and the same work becomes harder to reach. Repeat call-outs disrupt occupied London buildings, so cutting the old sealant out fully and doing it right once is the better route.

No two sites price the same: joint size, product, access and site hours all play a part. A fixed quote follows once we understand the job.

What you get with us

  • Old sealant cut out, never sealed over
  • 12-month guarantee on workmanship
  • Work to your specification and the manufacturer’s guidance
  • Our applicators hold CSCS cards

Take a look at our cost guide and our accreditations and insurance.

Diagnose, treat, sign off

A typical day starts with protection: tape along each joint edge and covers over finishes, stock and equipment close by. On site, the work normally takes anything from one day to a planned run of visits, depending on the number of seals and the access, and we clear our waste as we work. The ULEZ covers the whole of Greater London, and parking near a job is rarely simple. If there’s a loading bay, a car park or a permit we can use, tell us when you send details.

  1. First we confirm the product and tested details named in the specification.
  2. Openings are measured and grouped by detail.
  3. Improvised fillers and failed sealant are removed.
  4. Where the detail needs backing, it goes in at the stated depth.
  5. We gun the sealant in to the specified depth around each service and tool it.
  6. We walk the completed areas with you and confirm the records agreed at quote stage.

What we need from you

  • Make sure the joints can be reached
  • Let building users know which areas are affected
  • Share your working hours and any access restrictions

Request a quote

Specifications, drawings and tender packages are welcome with any enquiry, and we’ll price against exactly what is specified. For smaller jobs, photos and a description will do.

Ask for a quote

Read more

Doing it in-house

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.

Certain joints really need a specialist: for example fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. Getting these wrong typically costs more in the end than doing them right.

Accreditations

Trusted. Accredited. Insured.