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

Fire-rated sealing and fire stopping in Streatham, Greater London

Work needed on a service penetration in Streatham? We look at it, seal it with the right product and hand it over with a 12-month guarantee.

  • Unsealed joints where partitions meet the slab
  • Damaged fire seals in risers and voids
  • Fire-stopping items raised at inspection or handover
1
Send details
Photos, drawings or a schedule, or we visit.
2
Get a quote
Scope agreed and priced before anything starts.
3
We seal
CSCS-carded applicators, the right product for each joint.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
London, the South East & Scotland
CHAS accredited
£5m PL insurance

Fire stopping near Streatham

Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.

When to call us in Streatham

Most open service penetrations are left by later work. A new cable pulled by an electrician, a pipe rerouted by a plumber or a data run drilled through a riser leaves an opening that nobody returns to. Over a few years of fit-outs, a wall can collect a lot of these.

Common reasons buildings call us in:

  • Non-fire-rated filler around services
  • Damaged fire seals in risers and voids
  • Openings found when ceilings come down for a refit
  • Unsealed joints where partitions meet the slab

Residences at universities like King's College London, 3.2 miles to the north-east of Streatham, have compartment walls that must be resealed whenever services change.

What your quote should include

  • Will failed sealant be removed rather than covered?
  • Can the work be phased to keep areas open?
  • Who will actually carry out the work
  • How joint depth will be controlled

Choosing a commercial sealant contractor

Fire stopping for commercial buildings in Streatham

A fire-rated sealant is only one part of a tested system: 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 openings left by services added after handover and penetration schedules that need working through, we can help, on joints between fire-resisting walls and floors, pipe penetrations and small duct penetrations where the tested detail allows alike. A single leaking joint is often how a building in Streatham first comes to us: we check the joints around it and give you an honest view of what needs doing now and what can wait.

London has many occupied offices, blocks and mixed-use buildings where services are added and rerouted all the time. Where the specification names fire-rated sealant, it goes in exactly as the manufacturer’s test evidence shows for that wall or floor.

Building owners and contractors get the same cover: twelve months on the work we carried out. It doesn’t extend to damage, faults in the building or work by others, and we’re upfront about that.

Place
Streatham (SW16, SW2, CR4, SW12)
Region
Greater London
Guarantee
12 months on our workmanship
Quotes
Fixed quote, scope in writing
Phone
01277 525 020
Updated
3 November 2026
Mastic Doctor team members lined up next to their branded vans outside an office building

Penetration seals near Streatham

For England, the fire stopping of penetrations is dealt with in Approved Document B. References to the older BS 476 classes are being removed from it from 2 September 2029, after which the European classification, BS EN 13501-2, is the route, subject to transitional arrangements. Either way, we install the specified product to its tested detail. A 2-mile radius around Streatham takes in a number of hotels. Hotels are divided into compartments, and refurbishments that add pipes and cables through bedroom and corridor walls leave gaps to close.

At a healthcare site like British Home & Hospital for Incurables, which lies east of Streatham, new services through compartment walls are a constant, and each needs the specified seal. Shop fits in centres such as Priory Retail Park, 2.3 miles west of Streatham, can bring new services through fire-resisting walls between units, which then need the specified seal.

Streatham is about 5 miles south of London, in Greater London. Looking for fire stopping in Streatham? We can help, as we do across Greater London. Streatham is one of 764 places we cover in Greater London for service penetrations.

If you need fire stopping in SW16, SW2, CR4 and SW12, the process matches everywhere else we work: details, then a fixed price, then sealing and a 12-month guarantee. If your site is on Stanthorpe Road, Gleneagle Mews and Madeira Road or close by, we can quote for service penetrations. With the A205 and A216 nearby, Streatham is easy to get to with materials and equipment. Nearby places we also cover include Streatham Park (1 mile west), Furzedown (1 mile west), Streatham Hill (1 mile north), Hyde farm estate (1 mile north) and Grange Mills (1 mile north-west) for service penetrations. A short drive away, we cover London (5 miles north), City of Westminster (6 miles north), Marylebone (6 miles north), Kensington (6 miles north-west), St Pancras (7 miles north) and Shoreditch (7 miles north).

Local landmarks in Streatham

Recent enquiries here include premises near Bishop Thomas Grant Catholic Secondary School, Streatham Common and Waldorf School of South West London, among other places. Streatham has its own railway station: Streatham station. Nearby you’ll also find Clockworks Museum (1.1 miles east) and Southside Wandsworth (3.3 miles north-west). Green spaces nearby include Knight's Hill and Battersea Park Lake.

Map of Streatham © OpenStreetMap contributors

When to bring in a specialist

Putting right a botched joint often costs more than sealing it well at the start, because the whole bead must be removed and the faces cleaned back again. That’s why many clients bring in a specialist from the beginning.

What you see is the finished bead, but most of the work is hidden. Correct depth, the right primer and a sealant matched to the movement are where general trades tend to cut corners.

Different surfaces, different methods

Metal pipes

Metal pipes conduct heat, so their details often call for extra measures along the pipe, and the tested detail may ask for insulation beyond the wall. If the detail needs something beyond sealant, we tell you.

Drylining partitions

Service holes through plasterboard are frequently oversized or ragged. An oversized hole may be outside the sealant’s range.

Common questions from Streatham clients

Do you work in occupied care homes around Streatham?

Yes. Care settings are planned area by area, at times agreed with the home. We follow the home’s own procedures throughout.

Will you take on work at estates like Zennor Road Industrial Estate, close to Streatham?

Yes. Estates, retail parks and business parks around Streatham, Zennor Road Industrial Estate among them, are all within reach. To start, just speak to us on 01277 525 020 or email the details over with the unit, the joints involved and your access times.

Can you send site paperwork?

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

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

No. We are not members of a third-party fire-stopping installer scheme. We are CHAS accredited and a Constructionline member, and our applicators are CSCS-carded. Where a client or main contractor requires a scheme member, we will say so right away rather than waste your time.

Do you guarantee your work?

Yes, for 12 months. If a joint fails because of how we installed it, we come back and put it right.

How long do sealant joints last?

There isn’t a single answer, because life depends on how much the joint moves, how exposed it is and how it’s cleaned and used. Regular inspection is the best way to catch problems early.

Which standards are fire seals tested to?

Penetration seals are tested to BS EN 1366-3 and linear joint seals to BS EN 1366-4. Results are classified under BS EN 13501-2. The rating applies to the product as tested.

Why act early in Streatham

An improvised seal can look finished while offering no tested performance. The fix is to remove it and reinstall to the detail, so it makes sense to get it right first time. Failed sealant in a building in Streatham can quickly affect neighbours, tenants or the floor below: water travels through shared structures, and a small leak becomes a dispute between occupiers. Dealing with it early is simpler for everyone.

Quantities, awkward access and phased working all shape the price. Site requirements like inductions and permits play a part as well.

What you get with us

  • Products installed to the manufacturer’s instructions
  • Joints cleaned back to sound surfaces
  • CHAS accredited
  • Workmanship guaranteed for 12 months

Take a look at how commercial sealant jobs are priced or our accreditations and insurance.

What sets the cost

Your fixed quote is built from the real scope. It takes account of:

  • Any access equipment needed
  • Site requirements such as inductions and permits
  • Backing rod, priming and other preparation
  • Location, for remote and island sites

The specified product makes a difference, and so does the preparation, from cutting out to priming and backing rod. Access, phasing and site requirements come into it too.

Before you send an enquiry

It doesn’t need to be a full survey. These details are enough to start:

  • Specification clauses that apply
  • Whether an asbestos survey exists
  • Access details, including height
  • Where the site is, with the postcode

Need a figure for a tender or a budget? We’ll quote against your scope and drawings that you can work with. If you have questions first, phone 01277 525 020 or email a schedule or drawings.

Diagnose, treat, sign off

Working in a building that stays open takes some planning. We sign and contain the area we’re in, with routes through the building left open and work section by section so the rest of the building stays in use. Planning a London job such as one in Streatham starts with access: booked loading, goods lifts, the building’s permit system and a spot to keep materials. Send the building rules and access times with your enquiry.

  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. Mineral wool or other backing is fitted where required.
  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

  • Flag any permit to work we’ll need
  • Confirm the product named in the specification
  • Make sure the joints can be reached

Get a fixed quote

The quickest route to a quote is a few photographs and the site postcode. Send them through the quote form, or call 01277 525 020 or send photos by email if you’d rather talk the job through.

Ask for a quote

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