Facade and window perimeter sealing in Keston, Greater London
Facade joint and window perimeter sealing on commercial buildings in Keston and across Greater London. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.
- Weathered facade joints that have lost their grip
- Water coming in around window frames
- Perimeter sealant that has split or peeled away
Facade sealing across Keston
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
FAQs: Keston
Could you schedule work at a campus like Shaftesbury Nash College for the vacation?
Yes. Tell us the term dates, vacation periods and access windows, and we’ll plan the work around them. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.
Can you work at a site such as Glebe Farm Business Park, by Keston?
Yes, sites like Glebe Farm Business Park are within our area, along with the rest of Keston. Send details of the unit and the work through our quote form for a quick quote.
Which sealant do you use on facades?
Most facade and window perimeter joints take a low-modulus neutral-cure silicone. Hybrid or MS polymer, polyurethane and polysulphide sealants suit others.
Will you just go over the old sealant?
No. Overlaying old sealant is a frequent cause of early failure, so everything comes out first.
What’s the quickest route to a quote?
You can use the quote form on this site; alternatively, call 01277 525 020 or send photos by email. Photos, drawings or a joint schedule help us quote quickly.
Do you seal facades in winter?
Year-round work is possible as long as joints are dry and temperatures suit the product. Frost and condensation on glass and steel are common on winter mornings, and we build that into the programme.
Do you offer coloured sealant?
That depends on the product specified. Some ranges offer many colours, others very few, so the available colours are confirmed with the quote.
How we handle facade sealing in Keston
Most facade joint failures trace back to the joint, not just the sealant. Joint width needs to match how far the joint moves and how far the sealant can stretch, and closed-cell rod sets the depth, keeping the bond to two faces, often at around 2:1 width to depth, as the manufacturer advises. We work on shopfront frames, cladding panel joints and window and door perimeters, and the failures we are asked to look at most are facade joints cracked through the middle and perimeter joints where frames meet the structure. Sealant contractors, mastic applicators, sealant specialists: whatever the job title on the order, in Keston it comes down to the same thing: the right product in a properly prepared joint.
Around Keston, as across London, much of the work is refurbishing existing buildings as well as building new ones. Replacement windows, recladding and fit-outs leave perimeter and facade joints to seal, often next to people still using the building, so tidy, well-planned work matters.
A 12-month guarantee applies to all our work in Greater London. Should something we installed fail, give us a call on 01277 525 020 or email us and we will come back to it.
- Where
- Keston (BR2)
- Region
- Greater London
- Cover
- 12 months on our workmanship
- Quote
- Fixed quote, scope in writing
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
Keeping the joints sound
Once the work is signed off, these steps help:
- Don’t wait for a second leak before calling
- Keep sills, gutters and drainage paths clear
- Brief window cleaners about newly sealed joints
- Check the asbestos register before old mastic is disturbed
Look at perimeter and panel joints as part of routine building checks. Watch for splits, gaps at the edges, hardening and discolouration; record the locations.
Check older buildings for asbestos before disturbing old mastic. Some older mastics contain it.
Sites and facades in and around Keston
The ULEZ covers the whole of Greater London, Keston included, so site vehicles need to meet its standards or pay the daily charge. Add booked deliveries and tight storage, and the mastic package needs planning with the site team.
Older buildings in the area around Keston, such as Down House, which lies south-east of Keston, need care when sealed: the product has to suit soft or historic materials. New wings at hospitals like Princess Royal University Hospital (1.3 miles east of Keston) bring long runs of window and panel joints to seal.
Keston is about 3 miles south of Bromley, in Greater London. We cover Keston and the rest of Greater London, with the same fixed quotes and 12-month guarantee as everywhere else. 764 places across Greater London fall within our area, Keston among them. There’s a separate page for London, roughly 11 miles from Keston.
Postcode districts covered here: BR2 for facade joints. For a building on Church Road, Greys Park Close and Heathfield Road or nearby, we can quote for facade joints. Close to Keston, our area also takes in Nash (1 mile west), Farthing Street (1 mile south-east), Locksbottom (1 mile north-east), Leaves Green (2 miles south) and Hayes (2 miles north-west). Bigger towns within reach include London (11 miles north-west), City of Westminster (13 miles north-west), Marylebone (13 miles north-west), Kensington (14 miles north-west), St Pancras (13 miles north-west) and Shoreditch (12 miles north).
What’s near Keston
In Keston, that means premises near South Park, Ravens Wood School and The Greyhound pub and the streets around them. Keston’s nearest station is Hayes (Kent) station, roughly 1.5 miles north-west. Well-known places in the area include Princess Royal University Hospital (1.1 miles east) and Bethlem Museum of the Mind (1.5 miles north). Open spaces near Keston include West Kent Golf Course nature reserve and Summer Hill.
From enquiry to sign-off
At the end of each section, we remove the tape, clean down and inspect every joint. Where the sealant needs time to cure before use, we tell you and sign the area. The ULEZ covers the whole of Greater London, and parking near a job is rarely simple. Let us know about any on-site parking or loading arrangements when you send the job details.
- Access, site rules and timing are settled with the client up front.
- We only seal when joints are dry and within the product’s temperature range.
- Each joint is cut out and the edges inspected.
- Joints are cleaned, primed if required and fitted with backing rod.
- Facade-grade sealant goes in and is tooled to a tidy concave profile.
- We hand over with our 12-month workmanship guarantee.
What we need from you
- Point out parking and an unloading spot
- Point out any areas we must not close
- Tell us your opening times and when work is allowed
Get a fixed quote
Pricing a project or setting a maintenance budget? Send the scope and any drawings, and we’ll return a fixed quote you can plan around. If you have questions first, call 01277 525 020 or send photos by email.
Related advice
Surface by surface
Window and door perimeters
Frames grow and shrink with temperature, and the perimeter joint has to follow. Rod placed at the right depth lets the bead stretch.
Precast concrete panels
Precast arrises sometimes crumble or carry old residue. Faces are cleaned to sound concrete, and damaged edges are reported.
Nearby places to Keston
Other services in Keston
Signs you need facade sealing in Keston
A frequent fault is a bead stuck to the joint’s rear face as well as its sides. Without rod or bond-breaker tape, the bead is held back and tears as the joint moves.
These are often picked up first by site or facilities staff:
- Perimeter joints where frames meet the structure
- Facade joints cracked through the middle
- Draughts around frames and panels
- Cladding panel joints that have opened up
When a college such as Shaftesbury Nash College, 1.4 miles north-west of Keston, builds or refurbishes, the mastic package usually has to fit around students and staff.
What your quote should include
- Their pre-qualification and accreditations
- Which product they’ll use, and why it suits the joint
- Will failed sealant be removed rather than covered?
- What the guarantee covers, and for how long
When it isn’t the sealant
Sealant solves a lot, but not everything, and we are upfront when that’s the case. It won’t fix:
- Damp caused by condensation inside the building
- Arranging specialist high-level access, which is planned with the client
- Damaged frames that need replacing
Not sure which it is? You can call 01277 525 020 or email a schedule or drawings and we’ll tell you honestly.
Joints and surfaces we work on
- Cladding panel joints
- Window and door perimeters
- Perimeter joints where frames meet the structure
- Shopfront frames
- Stone and brick facade joints
- Coping and flashing joints
Commercial clients in Keston
As a CHAS accredited contractor and Constructionline member, we make supplier vetting simple. Our insurance certificate can be sent along with the quote.
We work for building owners and managing agents on everything from one building to a spread of sites. One quote can cover more than one site, which keeps the paperwork simple.