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

Fire stopping in Harringay

Fire stopping for Harringay, from a contractor working since 2005. Fully insured and CHAS accredited.

  • Penetration schedules that need working through
  • Openings left by services added after handover
  • Hidden openings found during inspections
1
Send details
Send the specification, photos or a marked-up plan.
2
Get a quote
One fixed quote covering the agreed scope.
3
We seal
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Signed off, with 12 months’ guarantee.
South East, London & Scotland
Constructionline member
Fully insured: £5m PL

Fire stopping in Harringay

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

Fire stopping in Harringay, done properly

On a fit-out or refurbishment, we follow the services contractors floor by floor. To price a package, phone 01277 525 020 or send details through our quote form with the schedule or marked-up drawings alongside the manufacturer’s details. Tell us what records you need and we’ll confirm with the quote. If you are dealing with unsealed penetrations discovered above suspended ceilings and builders’ foam or ordinary silicone in compartment walls, we can put it right, on pipe penetrations, service gaps in risers and cable penetrations alike. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: on jobs in Harringay, preparation and product choice get the time they need.

Fit-outs and M&E works in London buildings often leave service penetrations open behind ceilings and in risers. If sealant is the specified product we fit it to its tested detail, and if the detail needs something else, you will hear it from us.

Building owners and contractors get the same cover: a 12-month guarantee on our workmanship. It doesn’t extend to damage, faults in the building or work by others, and we are upfront about that.

The Mastic Doctor team beside their liveried vans in front of an office building
Location
Harringay (N4, N15, N8)
Wider area
Greater London
Guarantee
12 months on our workmanship
Price
A fixed quote before we start
Telephone
01277 525 020
Updated
3 November 2026

Keeping the joints sound

To get the most from the new sealant:

  • Look above ceilings when tiles are lifted for other jobs
  • Keep general-purpose fillers away from compartment walls
  • Put resealing into every M&E and fit-out package
  • Ask which product is in place before decorating

New services after handover are a common way fire stopping gets breached. A short check at the end of each job saves a long hunt later.

A simple record of seal locations and products helps. It tells the next contractor exactly what to reinstate, and it helps at inspections.

Why it’s worth doing now in Harringay

The longer openings stay, the more there tend to be: each new service adds to the list. Keeping on top of it after each round of works keeps the job small and avoids a much larger catch-up later. In Harringay, each extra visit means more notices, permits and disruption, so a proper job first time, with the old sealant fully removed, is worth it.

The price depends on how many linear metres there are, what has to come out first and the access. Call for a quote when you’re ready.

Why appoint us

  • Health and safety: CHAS accredited
  • Specification-led, product-correct work
  • Constructionline member for supplier checks
  • One number for every site we cover

Take a look at our cost guide or our accreditations.

Commercial clients in Harringay

Facilities managers want contractors who arrive with the paperwork sorted. Tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we’ll confirm with the quote.

Main contractors use us as their sealant subcontractor on new-build and refurbishment projects. Programme, specification and site rules come first, and our applicators hold CSCS cards.

Questions we’re asked in Harringay

Do you work in London buildings with loading restrictions?

Yes. Booked loading bays, goods lifts and permit-to-work systems are normal for London jobs. The building manager’s rules go straight into our method. We allow for the ULEZ, which covers every borough

Do you seal service penetrations in hotels around Harringay?

Yes, where fire-rated sealant is the specified product. We match the product to the wall or floor and the services, and say if something other than sealant is needed.

Can the building stay open while you work?

In the majority of cases, yes. Phased work can be planned so areas stay in use.

How do you choose the sealant?

The specification comes first, if there is one. Without one, the joint decides: how much it moves, what it bonds to and whether it’s wet, trafficked or fire-rated.

What will the job cost?

It depends on the job: quantities, access, the product and any phasing. Call for a fixed quote and we’ll price it properly.

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 the details over. Photos, drawings or a joint schedule help us quote quickly.

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 confirm what’s available for the specified product when we quote.

Signs you need fire stopping in Harringay

When a seal departs from its tested detail, the evidence no longer covers it. An oversized gap, too shallow a bead, missing backing or two makers’ products combined are the usual culprits.

Most enquiries start with something like this:

  • Unsealed penetrations discovered above suspended ceilings
  • Expanding foam used as fire stopping
  • Unsealed joints where partitions meet the slab
  • Damaged fire seals in risers and voids

Theatres, wards and plant rooms at sites like St Ann's Hospital, 0.5 miles east of Harringay, all have compartment walls crossed by services.

What your quote should include

  • Will failed sealant be removed rather than covered?
  • Can the work be phased to keep areas open?
  • The named product and why it was chosen
  • Are they CHAS accredited or on Constructionline?

Our contractor checklist

Compartments and services around Harringay

In England, Approved Document B covers fire stopping of openings and penetrations. 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. What we install is set by the specification, and it goes in to the tested detail. London’s office and residential buildings are refitted constantly, and each round of cabling or pipework can leave open penetrations. Penetrations are sealed with the specified product, to its tested detail, under the building’s own permit rules.

For a unit at a site such as Arena Shopping Park, less than half a mile to the south of Harringay, any new service through a fire-resisting wall should be sealed to the tested detail. Hotels such as Haringey Hotel (to the south-west of Harringay) rely on fire-resisting walls between bedrooms and corridors, and refits that add services leave penetrations to seal where fire-rated sealant is specified.

Harringay is about 2 miles north-west of West Hackney, in Greater London. Looking for fire stopping in Harringay? We can help, as we do across Greater London. 764 places across Greater London fall within our area, including Harringay. London is covered too, some 6 miles away.

We cover the N4, N15 and N8 postcode districts for service penetrations. If your site is on Elyne Road, Denton Road and Warham Road or close by, send details and we’ll quote for service penetrations. If your building is just outside Harringay, we cover Duckett's Green (1 mile north), West Green (1 mile north-east), St Ann's (1 mile east), Manor House (1 mile south) and Seven Sisters (1 mile east). Further afield, our area takes in London (6 miles south), City of Westminster (5 miles south-west), Marylebone (5 miles south-west), Kensington (7 miles south-west), St Pancras (4 miles south) and Shoreditch (4 miles south).

Near you in Harringay

Locally, jobs take us to sites close to Chestnuts Park, Park View School and Moselle Upper School and the streets around them. Nearby too are The Salisbury pub (under half a mile north) and Church of St Andrew (1.1 miles south-east). Harringay has its own railway station: Harringay Green Lanes station. Nearby you will also find Montfichet's Tower (4.7 miles south) and Markfield Beam Engine and Museum (1.6 miles east). Open spaces near Harringay include Railway Fields and Highgate Hill.

Map of Harringay © OpenStreetMap contributors

How the job changes by surface

Small ducts

We seal around ducts only within what the tested detail covers. Dampers and ductwork systems themselves are outside our work.

Risers and ceiling voids

Risers and ceiling voids hold most of a building’s service penetrations. Access is often tight, so we agree it with you in advance along with any permits your site needs.

Our process

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. For a job in Harringay, access comes first: 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. The specification and schedule come first, so we know which details apply.
  2. We plan the sequence of floors, risers and voids with you.
  3. We compare every service penetration with its tested detail before sealing.
  4. Foam, ordinary sealant and debris come out first.
  5. The specified backing and sealant go in to depth and are finished neatly.
  6. Anything outside the detail is reported to you rather than sealed.

What we need from you

  • Share your working hours and any access restrictions
  • Flag any permit to work we’ll need
  • Tell staff and tenants when we will be in

Get a fixed quote

Send details, get a quote, we seal, guaranteed: that’s how every job runs. To take the first step, give us a call on 01277 525 020 or use the quote form.

Ask for a quote

Advice

Accreditations

Trusted. Accredited. Insured.