Commercial Sealant Contractors in St Johns
Sealant work for offices, shops, hotels and other commercial buildings throughout St Johns and nearby, carried out by CSCS-carded applicators. CHAS accredited and fully insured.
- Greasy, split joints in a kitchen or tea point
- Water staining near frames, panels or ceilings
- Black mould through washroom sealant that won’t clean off
Commercial sealant contractors for St Johns sites
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Commercial sealant contractors for commercial buildings in St Johns
We have applied sealant on commercial sites for over 20 years, and the documents buyers ask for are ready: we are CHAS accredited and a Constructionline member, our applicators hold CSCS cards, and we carry five million pounds of public liability insurance. If your site needs RAMS, an insurance certificate or CSCS details, say so and we will confirm with the quote. We work on floor and threshold joints, movement joints in walls and floors and external facade joints, and what we’re called in for most is messy, uneven beads from earlier work that let the building down and damp patches where an external joint has failed. Whether you call it commercial sealant work, mastic application or joint sealing, the work in St Johns is the same: failed joints cut out, faces prepared and the right sealant laid to the right depth.
The most common commercial job in St Johns is resealing joints that have simply reached the end of their life: hardened, cracked or shrunk away from the faces, and letting water or dirt in.
Buildings in a London area such as St Johns rarely close for maintenance: offices with staff at their desks, shops trading below flats and receptions that can’t be roped off for long. Work is split into zones agreed with the building or facilities manager, so the premises keep working around us.
Building owners and contractors get the same cover: a 12-month guarantee on our workmanship. Faults in the structure, damage and other trades’ work fall outside it, and we say so plainly.
- Where
- St Johns (SE13, SE10, SE8)
- Wider area
- Greater London
- Guarantee
- 12 months on our workmanship
- Quotes
- Quoted before any work starts
- Call
- 01277 525 020
- Last updated
- 3 November 2026
Sealant on show in St Johns’s commercial buildings
A 2-mile radius around St Johns takes in plenty of hotels. Refits in hotels bring joints at vanity tops, bar counters and reception desks where the colour has to suit the scheme; work is planned so the hotel keeps trading. Less than 3 miles from St Johns there are at least three named estates and business parks. Tenant changes on such sites bring fit-outs, and fit-outs bring new joints, often in a colour the occupier specifies.
Industrial estates such as Brookmarsh Industrial Estate, 0.7 miles north of St Johns, have offices, trade counters and welfare areas whose sealant ages like any other building’s. In hotels such as St Wolframs Hotel, 1.2 miles to the east of St Johns, refurbishments typically mean bathroom, bar and reception joints where a matched sealant colour has to sit with the finishes.
St Johns is about 4 miles south-east of London, in Greater London. We cover St Johns and the rest of Greater London, with the same fixed quotes and 12-month guarantee as everywhere else. St Johns is one of 764 places in Greater London on our list for sealant joints.
Commercial sites across SE13, SE10 and SE8 are covered. We cover commercial and managed buildings on Avon Road, Mill Lane and Clare Road. Access to St Johns is via the A2210 and A2211. Sites close to St Johns are covered too, including New Cross (1 mile west), Deptford (1 mile north), Lewisham (1 mile south-east), Telegraph Hill (1 mile west) and Ladywell (1 mile south). Further afield, our area takes in London (4 miles north-west), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (8 miles west), St Pancras (6 miles north-west) and Shoreditch (5 miles north-west).
Local landmarks in St Johns
We work on buildings around Wickham Arms, Brookmill Park and Addey and Stanhope School, among other places. Nearby too are St. Paul's (0.7 miles north) and Laban Centre (0.8 miles north). There’s a railway station in St Johns itself: St Johns station. Nearby you will also find Fan Museum (0.9 miles north-east) and Lewisham Shopping Centre (0.7 miles south-east). Not far away are Brookmill Road Local Nature Reserve and Tower Hill.
Your questions answered
Can you work at a site such as Brookmarsh Industrial Estate, by St Johns?
Yes. Estates, retail parks and business parks around St Johns, Brookmarsh Industrial Estate among them, are all within reach. A few photographs and the unit address let us price the work.
Will our hotel in St Johns need to close for the work?
In most cases no closure is needed: we work room by room or floor by floor. The plan is built around your bookings.
Does weather matter for sealant work?
Outside, yes. Sealant needs a dry joint and a temperature within the product’s range, so damp, frosty or very cold days can stop external work. Inside work is seldom held up.
Can you work to our specification?
Yes. The specification and the manufacturer’s installation guidance are what we work to, and we raise anything unclear before work begins.
Is St Johns in your area?
Yes. St Johns is in our area and the rest of Greater London, within our coverage of Greater London, South East England and Scotland. To discuss a job, speak to us on 01277 525 020 or use the quote form.
Is the old sealant taken out first?
Removal comes first, every time. Then the joint is cleaned, primed where the maker specifies, backed to depth and resealed.
What about asbestos in old mastic?
It’s possible in older buildings, especially those built before 2000. Before cutting anything out, we ask for the asbestos register or survey, and anything suspect is left until it has been tested.
Our process
Where the site stays busy, we agree a sequence with your contact so the disruption stays in one area at once. Each area is protected, prepared and sealed, then handed back before the next one starts. All of Greater London is in the ULEZ, and kerbside space in St Johns can be scarce. Let us know about any on-site parking or loading arrangements when you send the job details.
- You send photos, drawings or a list of the joints and areas involved, and a site visit is booked where it helps.
- We work out why the joints have failed and fix a quote for the agreed scope.
- Site hours, access windows and the order of areas are agreed before we start.
- Failed sealant is cut out and each joint cleaned back to sound, dry faces.
- We fit backing to the right depth, prime where specified and lay the new bead.
- We walk the completed areas with you and sign them off under the 12-month guarantee.
Preparing the site
- Share your working hours and any access restrictions
- Have the specification and drawings to hand
- Explain the parking and delivery arrangements
Getting a fixed quote
Every job follows the same four steps: send details, get a quote, we seal, guaranteed. To take the first step, phone 01277 525 020 or email drawings and photos.
Related advice
What the job involves on each surface
Fire-rated seals where specified
Intumescent and other fire-rated sealants go in at service penetrations and linear gaps to the maker’s tested details, where they are specified. The design and sign-off of fire stopping belong to the designer and building control; we install what’s specified.
Washrooms and toilets
Mould that has grown into washroom sealant can’t usually be cleaned out. Replacement is the fix: strip, clean, dry and reseal.
How the quote is worked out
Your fixed quote is built from the real scope. It allows for:
- Quantities, in metres or numbers
- Induction, permit and paperwork requirements
- How much existing material needs removing
- Joint width, depth and condition
There’s no price list, since every building and every scope is different. For a fixed figure, call for a quote and we’ll price your job on its own details.
Details that help us quote
It doesn’t need to be a full survey. These details are enough to start:
- Whether the building will be occupied during the work
- Anything awkward about access or site hours
- Clear photos of the problem areas
- When you need the work done
If there’s a specification, drawings or a tender package, send it with your enquiry, and we will price the work to it. Smaller jobs need nothing more than photographs and a few notes.
When it isn’t the sealant
Being straight saves everyone time. New sealant won’t cure:
- Leaks from pipework, wastes or valves (that’s plumbing)
- Leaking roofs, gutters or flat-roof membranes (those need a roofer)
- Broken glass or blown double-glazed units
If in doubt, call 01277 525 020 or email drawings and photos and we’ll say what we think.
Surfaces we seal
- Window and door perimeters
- Floor and threshold joints
- Washrooms and tea points
- Movement joints in walls and floors
- Kitchen worktops and splashbacks
- External facade joints
For managing agents and facilities managers
We take on planned maintenance as well as one-off repairs: working through a building or an estate in stages that fit your budget. St Johns can form part of a wider programme across Greater London.
Facilities managers want contractors who arrive with the paperwork sorted. Let us know the documents you need (RAMS, insurance certificate, CSCS details) and we’ll confirm them with the quote.
When to call us in St Johns
Every sealant joint is a maintenance item. How long one lasts depends on the movement it takes, its exposure to sun and weather, the cleaning regime, the traffic and the product itself. In commercial buildings those factors tend to act together, so periodic inspection matters more than any date on a schedule.
Look out for the following:
- Movement joints packed with grit and debris
- Damp patches where an external joint has failed
- External beads that have gone brittle and cracked
- Window and door perimeter joints that have cracked open
For a shop at a centre such as Lewisham Shopping Centre, 0.7 miles south-east of St Johns, tidy joints at counters and displays matter as much as the fixtures.
Before you book anyone
- Their approach to joint depth and backing
- The terms of the workmanship guarantee
- Do they follow the manufacturer’s priming guidance?
- How they’ll work around occupants