St John's Wood fire stopping
Our CSCS-carded applicators take on fire-rated and intumescent sealing of service penetrations and linear gaps in St John's Wood and the surrounding area. Send photographs or drawings for a fixed quote.
- Openings left by services added after handover
- Openings found when ceilings come down for a refit
- Expanding foam used as fire stopping
Fire stopping across St John's Wood
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
How we handle fire stopping in St John's Wood
A lot of fire-stopping work comes after M&E installation, a refit or a tenant fit-out. Each new cable, pipe or data route cut through a fire-resisting wall leaves an opening behind. We close the openings listed on your schedule, using the specified sealant and detail. We work on linear gaps at wall heads, cable penetrations and joints between fire-resisting walls and floors, and what we’re called in for most is seals that don’t match their tested detail and unsealed joints where partitions meet the slab. Facilities teams, main contractors and managing agents in St John's Wood tend to want the same three things: a clear scope, tidy work and joints that don’t fail again.
Fit-outs and M&E works in London buildings often leave service penetrations open behind ceilings and in risers. Fire-rated sealant goes in where it’s the specified item; where a collar, wrap or batt is called for instead, we flag it.
Whoever the client is, the cover is the same: twelve months on the work we carried out. Faults in the structure, damage and other trades’ work fall outside it, and we say so plainly.
- Place
- St John's Wood (NW8, NW6, NW3)
- Region
- Greater London
- Cover
- 12 months on our workmanship
- Quote
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
What the job involves on each surface
Linear joints
Linear joints run along the head of a wall, at a slab edge or between two fire-resisting elements. Their tested detail, under BS EN 1366-4, sets the width, depth, backing and movement allowed and the installation has to fit inside those limits.
Masonry and concrete
Block walls and concrete floors are common substrates for penetration seals. Dust and debris are cleared from the opening, so the sealant and any backing sit properly.
Fire stopping around St John's Wood: how the place shapes the job
With tenants changing and fit-outs following, London buildings see service routes altered again and again. Where fire-rated sealant is specified, we install it to the tested detail under the building’s permit-to-work arrangements. Approved Document B is the English guidance that covers fire stopping around openings and penetrations. The national BS 476 classes are due to drop out of it from 2 September 2029, leaving the European BS EN 13501-2 route, subject to transitional arrangements. Either way, we install the specified product to its tested detail.
For a hospital such as Hospital of St John and St Elizabeth (less than half a mile south of St John's Wood), penetration sealing is typically phased ward by ward, with infection-control rules agreed first. For an estates team at a campus like Regent's University London, 1.1 miles to the south-east of St John's Wood, summer M&E works are typically followed by a round of penetration sealing. On a site such as The Quadrant Business Centre, 1.4 miles west of St John's Wood, every fit-out that runs new services through a compartment wall leaves penetrations to seal with the specified product.
St John's Wood is about 1 mile south of Hampstead, in Greater London. Commercial clients in St John's Wood can call on us for service penetrations, as part of our coverage of Greater London. Our Greater London coverage takes in 764 places, from busy centres to rural villages.
We take on service penetrations across the NW8, NW6 and NW3 postcode area, whatever the building. If your site is on The Lane, Hall Road and Hill Road or close by, send details and we’ll quote for service penetrations. St John's Wood sits on or close to the A5205. If your building is just outside St John's Wood, we cover South Hampstead (1 mile north), Swiss Cottage (1 mile north), Primrose Hill (1 mile north-east), Lisson Grove (1 mile south) and Haverstock (1 mile north-east). A short drive away, we cover London (4 miles south-east), Kensington (3 miles south-west), St Pancras (3 miles east), Shoreditch (4 miles east), Walthamstow (7 miles north-east) and Hoxton (4 miles east).
What’s near St John's Wood
Locally, jobs take us to sites close to Cecil Sharp House, Primrose Hill and Arnold House School and the streets around them. You will also find Quintin Kynaston Community Academy (under half a mile north-west) and Cafe Med pub (under half a mile north-west). St John's Wood has its own railway station: South Hampstead station. Nearby you will also find Hospital of St John and St Elizabeth (under half a mile south) and Montfichet's Tower (3.5 miles south-east). Green spaces nearby include The Long Water and Primrose Hill.
Looking after the joints
Cleaning and maintenance staff play a part too. Share these points with them:
- Ask which product is in place before decorating
- Treat an open penetration as a priority repair
- Check risers and ceiling voids after each round of works
- Don’t let anyone top up a fire seal with the wrong product
Store the specified product details somewhere the next contractor can find them. Anyone resealing later needs to know which product and detail were used.
Keep a register of where seals are and what they are made of. When a new service goes through, everyone knows which product and detail to match.
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. Failed sealant in a building in St John's Wood can quickly affect neighbours, tenants or the floor below: water travels through shared structures, and a small leak becomes a dispute between occupiers. Putting it right early is less disruptive than dealing with the consequences.
Quantities, awkward access and phased working all shape the price. Site requirements like inductions and permits play a part as well, along with the time of year for external work.
Why clients in St John's Wood choose us
- One contact handling all your sites
- Old sealant cut out, never sealed over
- Clear, fixed quotes
- A Constructionline member, so easy to vet
See what affects the cost and our accreditations and insurance.
From enquiry to sign-off
At the end of each section, we remove the tape, clean down and inspect every joint with your site contact. If an area should be left alone while the sealant cures, we say how long and put signs out. Planning a London job such as one in St John's Wood starts with access: booked loading, goods lifts, the building’s permit system and a spot to keep materials. Give us the hours we can be on site and we’ll schedule to suit.
- First we go through the drawings, schedule or specification for the seals.
- On site, each opening is checked against the tested detail it is meant to follow.
- Anything that doesn’t belong in the opening, such as expanding foam or general-purpose filler, is removed.
- We fit the backing the detail asks for, to the stated depth.
- Fire-rated or intumescent sealant is gunned in to the specified depth, then tooled.
- If an opening needs something other than sealant, we tell you instead of improvising.
Before we start on site
- Send your site hours and access windows
- Make sure the joints can be reached
- Let us know about inductions and permits
Ask for a quote
The quickest route to a quote is a few photos and the site postcode. Send them through the quote form, or give us a call on 01277 525 020 or send photos by email to discuss it first.
Read more
General trades versus a specialist
Paperwork matters too. Many sites expect CSCS cards, RAMS and proof of insurance, and we’ll confirm the paperwork you need with the quote.
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.
FAQs: St John's Wood
Can you seal around new services in a hotel near St John's Wood?
Yes, where the specification calls for fire-rated sealant. We match the product to the wall or floor and the services, and say if something other than sealant is needed.
Is a hospital such as Hospital of St John and St Elizabeth somewhere you can work?
Yes, healthcare and care buildings are part of our work. Each area is agreed with the ward or department and the estates team in advance.
How many days will you need on site?
That varies with the scale of the job, though a typical visit typically takes anything from one day to a planned run of visits, depending on the number of seals and the access. Larger or phased jobs take longer, and we’ll give you a timescale with the quote.
Can you work while the building is occupied?
In most cases, yes. We phase the work so most of the building stays in use, with each area protected and signed.
How soon can the area be used again?
We will confirm how long the chosen product needs to cure, and sign any area that should be left alone.
Do you cover St John's Wood?
Yes. St John's Wood is in our area and the rest of Greater London, within our coverage of Greater London, South East England and Scotland. For a quote, call the office on 01277 525 020 or email a schedule or drawings.
Is your workmanship covered by a guarantee?
Yes. The 12-month guarantee covers our preparation and application, though not damage or work by other trades.
Towns and villages near St John's Wood
Other services in St John's Wood
For managing agents and facilities managers
Blocks and communal areas make up much of the work for housing associations and agents. We phase the work so people keep access, and each stage is agreed with your contact.
Agents, factors and owners’ representatives all follow the same route: send details, get a fixed quote, we seal, guaranteed. Keys, access and contacts can be agreed in advance.