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

Fire-rated sealing and fire stopping in Coldharbour, Surrey

Need fire stopping in Coldharbour? It’s simple: send details, get a quote, we seal, guaranteed.

  • Head-of-wall gaps with no fire seal
  • Damaged fire seals in risers and voids
  • Fire-rated sealant that has cracked or shrunk back
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
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Signed off, with 12 months’ guarantee.
South East, London & Scotland
CHAS accredited
Fully insured: £5m PL

Fire stopping for Coldharbour sites

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

Fire stopping for commercial buildings in Coldharbour

Penetration seals are fire tested to BS EN 1366-3 and linear joint seals to BS EN 1366-4. A rating such as EI 60 only holds when the product is installed as it was tested. So our job is to reproduce that arrangement faithfully. Most enquiries involve unsealed joints where partitions meet the slab and improvised or mixed-product fire seals, on pipe penetrations, linear gaps at wall heads and cable penetrations. A single leaking joint is often how a building in Coldharbour 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.

For a smaller site near Coldharbour, we plan to do all the penetrations in one go, so send the specification and photos first. Design and sign-off belong to the designer or building control; we install what’s specified.

Our 12-month guarantee is about workmanship, not wear and tear. How long a sealant joint lasts depends on movement, exposure, cleaning and use, so we’re clear about what is covered before work starts.

Place
Coldharbour (RH5)
Region
Surrey
Cover
A 12-month guarantee
Quotes
Quoted before any work starts
Phone
01277 525 020
Last updated
3 November 2026
The Mastic Doctor team standing beside their branded vans outside an office building

Why act early in Coldharbour

It is cheaper to seal service penetrations as each services package finishes than to come back for them later. While the area is still open, every opening is easy to see and reach, and the right detail can be checked at the time. Older rural buildings around Coldharbour move with the seasons, and rigid or tired sealant can’t keep up. The right product, sized to the joint, copes much better.

Access often affects the price as much as the sealing: joints within easy reach take less time than ones that need access equipment. Tell us how the joints are reached and call for a quote.

What you get with us

  • Workmanship guaranteed for 12 months
  • Public liability insurance in place
  • One number for every site we cover
  • Fixed quotes based on photos, drawings or a visit

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

Different surfaces, different methods

Drylining partitions

Plasterboard partitions are tested as a specific construction. We check that the product’s detail covers that partition type and board thickness first.

Metal pipes

Metal pipes conduct heat, so their details often call for extra measures along the pipe, and some details add wrapping or a set length of insulation. We follow whatever the detail requires and flag anything we can’t match.

On site: what to expect

Before we leave any area, we remove the tape, clean down and inspect every joint, ready for your sign-off. Where the sealant needs time to cure before use, we tell you and sign the area. For a building around Coldharbour, tell us how to find it and who will meet us. Add it to your enquiry and we will build it into the plan.

  1. We ask for the product and detail your designer has specified.
  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.

Preparing the site

  • Make sure the joints can be reached
  • Tell us your opening times and when work is allowed
  • Explain the parking and delivery arrangements

Quotes

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

Get a price

Read more

Coldharbour: questions and answers

Is Coldharbour too far out for you?

No. Places such as Coldharbour are covered as much as the big towns. London and every South East county are within our area. Good photos up front let us bring everything on the first visit.

What happens to BS 476 references for fire stopping in Coldharbour?

References to BS 476 classes are being removed from Approved Document B from 2 September 2029, after which BS EN 13501-2 classification is the route, subject to transitional arrangements. Our part doesn’t change: the specified product, to its tested detail.

Is colour matching possible?

Often, yes. Many products come in a range of standard colours, and matching to RAL references or surrounding finishes is often possible. We’ll confirm the colours available for the specified product.

How soon can the area be used again?

That comes down to the sealant and the temperature. Some products skin over quickly but need longer to cure fully, so we’ll confirm the curing time on the day.

How long does a typical visit take?

We plan the time on site around your programme and access. We will give you an estimate of time on site when we quote.

Which sealant will you use?

A specification, where there is one, decides it. If there isn’t one, it comes down to the joint: its movement, its surfaces and what it has to cope with.

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.

Building owners, agents and FMs in Coldharbour

Building owners and managing agents use us on everything from one building to a spread of sites around Coldharbour. Several sites can go on one quote, so there’s one set of paperwork to deal with.

As a CHAS accredited contractor and Constructionline member, we are straightforward to vet for your supplier list. Our insurance certificate can be sent along with the quote.

How the quote is worked out

Sealant work doesn’t have a standard rate, because every site is different. What we look at:

  • Whether old sealant has to be cut out first
  • Induction, permit and paperwork requirements
  • Any access equipment needed
  • Quantities, in metres or numbers

Every site prices differently: the joint sizes, the specified product, access and working hours each have a bearing. A fixed quote follows once we understand the job.

What we need to price the job

A good diagnosis starts with the right details. Let us know:

  • The type of building and who uses it
  • The asbestos register, for older buildings
  • Clear photos of the problem areas
  • Specification clauses that apply

Send us photographs, drawings or a joint schedule and a fixed quote comes back to you. Where a site visit makes more sense, we’ll arrange one.

Where services cross fire walls in Coldharbour

Approved Document B is the English guidance that covers fire stopping around 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. We install whatever has been specified, to the product’s tested detail. At about 25 miles from central London, Coldharbour is within reach of the capital. Offices around the capital are refitted often, and the cabling that follows can breach fire-resisting walls; the gaps need the specified seal.

In a building such as Christ Church, any service penetration through a fire-resisting wall should be sealed to the specified detail. For buildings in and around Coldharbour, fire-rated sealant is installed where it is specified, to the manufacturer’s tested detail.

Coldharbour is about 4 miles south of Dorking, in Surrey. Looking for fire stopping in Coldharbour? We can help. 379 places across Surrey fall within our area, including Coldharbour. Our London page has more on work in that area, about 25 miles away.

If you need fire stopping in RH5, the process matches everywhere else we work: details, then a fixed price, then sealing and a 12-month guarantee. Just outside Coldharbour, we also work in Abinger Bottom (2 miles north-west), South Holmwood (2 miles north-east), Holmwood Corner (2 miles east), Friday Street (2 miles north-west) and Beare Green (2 miles east). A short drive away, we cover Guildford (10 miles north-west), Woking (13 miles north-west), Epsom (11 miles north), Horley (8 miles east), Redhill (9 miles north-east) and Ewell (13 miles north).

Landmarks near Coldharbour

Around Coldharbour, our work takes us to commercial buildings near Wotton and Abinger Commons and Plough Inn, among other places. The closest station to Coldharbour is Holmwood station, roughly 1.6 miles east of the centre. Nearby you will also find Mesolithic Museum (2.6 miles north-west) and Abinger Castle (2.6 miles north-west). Green spaces nearby include Vann Lake and Leith Hill.

Map of Coldharbour © OpenStreetMap contributors

Keeping the joints sound

To get the most from the new sealant:

  • Keep product data and details in the fire safety file
  • Ask the designer to confirm details early on refits
  • Check risers and ceiling voids after each round of works
  • Make fire stopping part of every scope that crosses a fire-resisting wall

After the work, brief anyone else working in the area that the openings are now sealed. Any seal cut back for a new service needs reinstating to its tested detail using the same product.

A simple record of seal locations and products helps. When a new service goes through, everyone knows which product and detail to match, and it helps at inspections.

Accreditations

Trusted. Accredited. Insured.