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

Fire-rated sealing and fire stopping in Guildford, Surrey

Fire-rated and intumescent sealing of service penetrations and linear gaps in Guildford and across Surrey. CHAS accredited and fully insured, with a 12-month guarantee.

  • Openings left by services added after handover
  • Fire seals cut back for extra cables and never reinstated
  • Builders’ foam or ordinary silicone in compartment walls
1
Send details
Drawings, photos, a joint schedule or a site 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
Signed off, with 12 months’ guarantee.
Covering the South East & Scotland
Constructionline member
£5m PL insurance

Fire stopping for businesses in Guildford

Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.

Fire stopping in Guildford

We are commercial sealant applicators, CHAS accredited and a Constructionline member, with CSCS-carded applicators on site. We hold no third-party fire-stopping installer certificate and we’d rather say that up front. What we offer is careful installation of the specified sealant to its tested detail, with a 12-month guarantee on our workmanship. We work on linear gaps at wall heads, pipe penetrations and service gaps in risers, and the usual reasons a site gets in touch are fire sealant pulled out of the opening and open linear gaps along the top of fire-resisting walls. A specialist sealant contractor works differently from a general builder: on jobs in Guildford, preparation and product choice get the time they need.

Bigger buildings around a town like Guildford are often done in sequence: services first, then penetration and linear seals. We work to the specification and the manufacturer’s installation guidance, while design and sign-off stay with the designer and building control.

Our workmanship is guaranteed for 12 months, in Guildford as everywhere else we work. If a joint we sealed fails because of how it was installed, we come back and put it right.

Mastic Doctor team members lined up next to their branded vans outside an office building
Where
Guildford (GU1, GU2, GU4, GU3)
Wider area
Surrey
Guarantee
12 months on every job
Quotes
Fixed quote, scope in writing
Telephone
01277 525 020
Updated
3 November 2026

Building owners, agents and FMs in Guildford

We take on planned maintenance as well as one-off repairs: resealing failed joints building by building, on a schedule that suits your budget. Guildford can form part of a wider programme across Surrey.

We work for building owners and managing agents on everything from one building to a spread of sites around Guildford. Several sites can go on one quote, so there’s one set of paperwork to deal with.

Service penetrations in Guildford buildings

Guildford is about 27 miles from central London. Business park offices in the commuter belt are refitted as tenants change, and each fit-out adds services through compartment walls. The 2 miles around Guildford include three care or nursing homes. Care settings depend on compartmentation, so service penetrations made during maintenance or refurbishment need sealing with the specified product.

Refits at places like Ladymead Retail Park, under half a mile to the north-west of Guildford, often reroute services through walls between units. For a hotel such as The Stoke Hotel, less than half a mile to the south of Guildford, penetration seals are worth checking after any refit or services upgrade. Colleges such as Guildford College, under half a mile to the south-east of Guildford, add IT and services as courses change, and each new penetration through a fire-resisting wall needs sealing with the specified product.

Guildford is about 27 miles south-west of London, in Surrey. Guildford sits inside our coverage and the rest of Surrey, with the same fixed quotes and 12-month guarantee as everywhere else. Across Surrey, 379 places are covered, including Guildford. Sites around Reading have their own page, roughly 22 miles from Guildford.

If you need fire stopping in GU1, GU2, GU4 and GU3, the process matches everywhere else we work: details, then a fixed price, then sealing and a 12-month guarantee. Streets here include Church Road, Market Street and High Street, and sites on any of them can send details for a fixed quote. With the A3 and A25 nearby, Guildford is easy to get to with materials and equipment. Just outside Guildford, we also work in Bellfields (1 mile north), Abbotswood (1 mile south-east), Stoughton (1 mile north-west), Westborough (1 mile west) and Burpham (1 mile north-east). Further afield, our area takes in Woking (5 miles north), Camberley (9 miles north-west), Epsom (15 miles north-east), Farnham (10 miles west), Egham (13 miles north) and Walton-on-Thames (12 miles north-east). Guildford is one of the busier places in Surrey, and we take on service penetrations for its commercial and public buildings.

Around Guildford

Around Guildford, our work takes us to commercial buildings near The King's Head pub, Guildford High School and Surrey Maths School, among other places. The closest station to Guildford is London Road (Guildford) station, roughly 0.6 miles south-east of the centre. A little further out are Guildford Castle (0.9 miles south) and Guildford House (0.8 miles south). Not far away are Silent Pool and Pewley Hill.

Map of Guildford © OpenStreetMap contributors

FAQs: Guildford

Can work in a care setting near Guildford go ahead while residents are there?

Yes. We agree rooms and times with the manager and work a few areas at a time. Any site rules, from signing in to infection control, are agreed before we start.

Could you schedule work at a campus like University of Surrey - Stag Hill Campus for the vacation?

Yes. We plan campus work around teaching, exams and residence turnarounds. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.

Do you take on multi-site work?

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.

Do you hold third-party fire-stopping installer certification?

No. We don’t hold a third-party fire-stopping installer certificate. Our credentials are CHAS accreditation, Constructionline membership and CSCS-carded applicators, and we are fully insured. Where a client or main contractor requires a scheme member, we will say so right away rather than waste your time.

How long do sealant joints last?

It depends on movement, UV and weather, cleaning, traffic and the product. Sealant joints are maintenance items, so inspect them regularly.

How do we ask for a quote?

The quote form is the simplest route, though you can also give us a call on 01277 525 020 or email drawings and photos. Photos, drawings or a joint schedule help us quote quickly.

What does an EI 60 rating mean?

The tests are BS EN 1366-3 for penetrations and BS EN 1366-4 for linear joints, and classification is to BS EN 13501-2. EI 60 means integrity and insulation for 60 minutes in the tested arrangement; installing to the detail is what carries that across to site.

How a job runs

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. In a large town like Guildford, work on busy buildings is planned area by area, so the building keeps working. Photos and drawings let us propose a sequence with the quote.

  1. First we go through the drawings, schedule or specification for the seals and raise any questions before we price.
  2. On site, each opening is checked against the tested detail it is meant to follow.
  3. Anything that doesn’t belong in the opening, such as expanding foam or general-purpose filler, is removed.
  4. Mineral wool or other backing goes in wherever the detail asks.
  5. Fire-rated or intumescent sealant is gunned in to the specified depth, then tooled.
  6. If an opening needs something other than sealant, we tell you instead of improvising.

Before we start on site

  • Move anything stored against the joints
  • Confirm the product named in the specification
  • Tell staff and tenants when we will be in

Quotes

Pricing a project or setting a maintenance budget? We’ll quote against your scope and drawings that you can work with. If you have questions first, give us a call on 01277 525 020 or email a schedule or drawings.

Get a price

Related advice

Should maintenance staff do it?

For a quick touch-up, site staff may be fine, but anything bigger is another matter: a specialist brings efficiency, a consistent finish and a 12-month guarantee.

General builders and handymen seal joints, but it isn’t their main trade. A specialist brings correct preparation, depth control with backing rod and a product suited to that particular joint.

When it isn’t the sealant

Before quoting, we check that sealant is the right answer. It won’t put right:

  • Issuing fire ratings or certificates for seals
  • Reviewing a building’s overall fire safety
  • Walls or floors that aren’t fire-resisting to begin with

If you are not sure, just phone 01277 525 020 or email the details over and we will give you a straight answer.

Surfaces we seal

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

What sets the cost

These are the things that shape the price:

  • Site requirements such as inductions and permits
  • Location, for remote and island sites
  • Working within restricted access windows
  • Whether old sealant has to be cut out first

The specified product makes a difference, as does the preparation each joint needs, from cutting out to priming and backing rod. Access, phasing and site rules also count.

What to include in your enquiry

To price the job accurately, we need to understand the site. Send us:

  • The postcode of the building
  • Any dates the work must fit around
  • A wide shot and a close-up of the area
  • Whether an asbestos survey exists

Quotes are fixed against the scope you send, so the cost is agreed before work starts. To start the process, give us a call on 01277 525 020 or email us.

Surface by surface

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.

Cables and cable bundles

Data cabling added after handover is a regular cause of open service penetrations. Openings around new cables are resealed to the detail, and we tell you if the bundle exceeds what sealant covers.

Accreditations

Trusted. Accredited. Insured.