Fire stopping in Lewisham
Work needed on a service penetration in Lewisham? We assess it, carry out the work and guarantee our workmanship for 12 months.
- Unsealed joints where partitions meet the slab
- Seals disturbed by maintenance and left open
- Snag lists that include open service penetrations
Fire stopping across Lewisham
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Fire-rated sealing for Lewisham buildings
There are five care or nursing homes within about 2 miles of Lewisham. In a care home, any new pipe or cable through a fire-resisting wall should be sealed to the specified detail. The area within 2 miles of Lewisham holds a good number of hotels. Bedroom-to-corridor walls in hotels are normally fire-resisting, so new cabling or pipework through them has to be sealed to the tested detail.
For a unit at a centre such as Lewisham Shopping Centre, less than half a mile north-west of Lewisham, penetration seals are worth checking after each shop fit. Industrial units on estates such as Chiltonian Industrial Estate (to the south-east of Lewisham) often separate offices from warehouse space with fire-resisting walls, and new services through them need the specified seal.
Lewisham is about 3 miles west of Eltham, in Greater London. Across the SE13 postcode area, the process is the same: details in, fixed quote out, then sealing and a 12-month guarantee. Lewisham is one of 764 places we cover in Greater London for service penetrations.
Postcode districts covered here: SE13, SE8 and SE6. Among the streets we cover are Station Road, Lewisham High Street and Lewis Grove, and sites on any of them can send details for a fixed quote. Being close to the B220, Lewisham is easy to get to with materials and equipment. Sites close to Lewisham are covered too, including Ladywell (1 mile south-west), St Johns (1 mile north-west), Hither Green (1 mile south-east), Blackheath (1 mile north-east) and Lee (1 mile south-east). Further afield, our area takes in London (4 miles north-west), City of Westminster (7 miles north-west), Marylebone (7 miles north-west), Kensington (9 miles west), St Pancras (6 miles north-west) and Shoreditch (5 miles north-west).
Landmarks near Lewisham
In Lewisham, that means premises near St Joseph's Academy, Ladywell Fields and The Watch House, among other places. Lewisham has its own railway station: Lewisham station. Other landmarks nearby include Greenwich Castle (1.2 miles north) and Fan Museum (1.2 miles north). Not far away are Knight's Hill and Brookmill Road Local Nature Reserve.
About our fire stopping in Lewisham
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 won’t pretend otherwise. We install the specified fire-rated sealant to its tested detail, and our workmanship carries a 12-month guarantee. We work on small duct penetrations where the tested detail allows, joints between fire-resisting walls and floors and pipe penetrations, and what we’re called in for most is improvised or mixed-product fire seals and openings found when ceilings come down for a refit. Facilities teams, main contractors and managing agents in Lewisham tend to want the same three things: a fixed quote, no surprises on site and a 12-month guarantee behind the result.
In a London area such as Lewisham, buildings are refitted often, and every new cable, pipe or duct through a fire-resisting wall or floor leaves a gap. Where the specification names fire-rated sealant, it goes in exactly as the manufacturer’s test evidence shows for that wall or floor.
Whoever the client is, the cover is the same: 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.
- Where
- Lewisham (SE13, SE8, SE6)
- Wider area
- Greater London
- Guarantee
- 12 months on our workmanship
- Quotes
- A fixed quote before we start
- Phone
- 01277 525 020
- Page updated
- 3 November 2026
Also near Lewisham
More services for Lewisham
Diagnose, treat, sign off
Inspect, seal, sign off: every visit follows that pattern. First comes an inspection and agreement on scope, then the work is carried out to the specified product and detail, and the job ends with a walk round and sign-off. For a job in Lewisham, access comes first. Give us the hours we can be on site and we will schedule to suit.
- The specification and schedule come first, so we know which details apply.
- Access, permits and the order of areas are agreed with the site team.
- Each opening is checked for wall or floor type, service, gap and depth.
- Foam, ordinary sealant and debris come out.
- Backing and fire-rated sealant are installed to the detail and tooled.
- We tell you about openings that need a different product.
What we need from you
- Send any specification or drawings in advance
- Make sure the joints can be reached
- Explain the parking and delivery arrangements
Get a fixed quote
Specifications, drawings and tender packages are welcome with any enquiry, and we will price against exactly what is specified. For smaller jobs, photographs and a description will do.
Advice
Questions we are asked in Lewisham
How does the move away from BS 476 affect penetration seals in Lewisham?
From 2 September 2029, Approved Document B drops its BS 476 references in favour of BS EN 13501-2 classification, with transitional arrangements. Whichever applies, we install the specified product to its tested detail; the specification is for the designer to set.
Is Chiltonian Industrial Estate, near Lewisham, within your area?
Yes, sites like Chiltonian Industrial Estate are within our area, along with the rest of Lewisham. Send details of the unit and the work through our quote form for a quick quote.
Can one quote cover more than one building?
Yes. Several buildings can share a single quote, with one point of contact across South East England, Greater London and Scotland.
What happens if old sealant might contain asbestos?
The duty to manage asbestos sits with the building’s dutyholder, so for older buildings we ask for the asbestos register first. Work pauses if suspect material is found, until it has been tested.
Do you hold CHAS accreditation?
Yes. Mastic Doctor is CHAS accredited and a Constructionline member, which helps with supplier vetting.
How much does the work cost?
There isn’t a price list, because every site is different. Send photos or drawings and we’ll price it at a fixed figure.
Does the weather affect the work?
Outside, yes. The joint has to be dry and within the product’s temperature range, so frost, rain or cold mornings can delay outside work. Internal work is rarely affected.
Site staff or a sealant specialist?
What you see is the finished bead, but most of the work is hidden. Backing rod, primer where specified and a joint designed to move with the building are easy to get wrong without experience.
For most general trades, sealant is a sideline. A specialist brings correct preparation, depth control with backing rod and a product suited to that particular joint.
Why act early in Lewisham
Sealing behind the M&E trades area by area beats a sweep at the end. Openings are visible, access is open and nothing has to be taken down. Access in London is hard enough to arrange once, so it makes sense to deal with every failing joint while access is in place.
Larger quantities, tricky access or phasing 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 choose Mastic Doctor in Lewisham
- Constructionline member
- CHAS accredited contractor
- Sealing commercial buildings since 2005
- A fixed quote before work starts
Take a look at what affects the cost and how we’re accredited.
What we can’t put right
Honesty saves time and money. Fresh joints won’t solve:
- Construction that lacks the fire resistance the seal relies on
- Designing or specifying fire stopping, which sits with the designer or fire engineer
- Openings that need collars, wraps, batts or boards rather than sealant
If in doubt, ring 01277 525 020 or email the details over and we’ll say what we think before you book.
Joints and surfaces we work on
- Pipe penetrations
- Small duct penetrations where the tested detail allows
- Linear gaps at wall heads
- Cable penetrations
- Service gaps in risers
- Joints between fire-resisting walls and floors
For managing agents and facilities managers
FMs need a contractor who is easy to get on site. Let us know the documents you need (RAMS, insurance certificate, CSCS details) and we will confirm them with the quote.
Building owners and managing agents use us on sealant work across single buildings or whole portfolios. One quote can cover more than one site, which keeps the paperwork simple.
When to call us in Lewisham
On a busy project, programme pressure can mean fire stopping is rushed or left to whichever trade is closest. That is how unsuitable products and improvised details end up in compartment walls and later need putting right.
Things that typically lead to an enquiry:
- Openings left by services added after handover
- Damaged fire seals in risers and voids
- Penetration schedules that need working through
- Hidden openings found during inspections
Workshops and IT rooms at colleges like Christ the King Sixth Form College (less than half a mile north-east of Lewisham) are re-serviced often, leaving penetrations to seal.
What to look for in a quote
- What site paperwork they can supply
- What the guarantee covers, and for how long
- Are they CHAS accredited or on Constructionline?
- How the existing material will be dealt with