Mastic Sealing in Keston
Sealant work in Keston for main contractors, managing agents and facilities managers: mastic sealing for building owners, managing agents and housing associations, quoted at a fixed price.
- Draughts at frames across a block
- Leaks at window and door perimeters
- Communal area joints that look neglected
Need mastic sealing in Keston?
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
FAQs: Keston
We manage a building near Hayes (Kent) station. Can you help?
Yes. Managing agents, landlords, property factors and housing associations are who this service is for. Photos of each elevation help us quote accurately.
Can you work in a London building with booked loading and goods-lift slots?
Yes. Inductions, permits and timed loading are routine for us in London. Share the building’s contractor rules and we will work to them. All of Greater London is inside the ULEZ, and our planning allows for it
Who decides which product is used?
The specification comes first, if there is one. If there isn’t one, it comes down to the joint: how much it moves, what it bonds to and whether it’s wet, trafficked or fire-rated.
What paperwork can you provide?
Let us know your requirements: tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we will confirm with the quote. We hold CHAS accreditation and Constructionline membership.
Will you just go over the old sealant?
No. We cut the old material out and clean the joint back before sealing, because fresh silicone will not bond with aged silicone.
Can you seal joints high up on a block?
Every block is different. We agree access with you at quote stage so the fixed quote reflects it.
How do you handle work on occupied blocks?
Occupiers stay in the building throughout. We flag any areas that need internal access well before the dates so you can arrange it with occupiers.
About our mastic sealing in Keston
In buildings from before 2000, some old mastics contain asbestos. We check the asbestos register or survey before any old sealant is cut out, and work stops for testing if there’s any doubt. Removing asbestos-containing material isn’t something we do. If you are dealing with draught complaints from residents or tenants and movement joints with sealant missing, we can help, on window and door perimeters on blocks, shopfronts below residential blocks and communal kitchens and washrooms alike. A specialist sealant contractor works differently from a general builder: on jobs in Keston, preparation and product choice get the time they need.
Planning mastic work on a London block means notices to residents, access to flats and agreed working areas. We work to the agent’s notice and access plan, so residents know what’s happening.
We sign every job off with a 12-month guarantee. The promise is simple: if our work fails within that year, we put it right.
- Where
- Keston (BR2)
- Wider area
- Greater London
- Cover
- 12 months on every job
- Price
- A fixed quote before we start
- Call
- 01277 525 020
- Updated
- 3 November 2026
Do you need mastic sealing in Keston?
We often find joints filled solid with no backing rod, so the mastic is glued to the joint bottom too. It can’t stretch properly and splits as the building moves.
It’s worth sending us details if you spot any of the following:
- Damp patches beside frames
- Cracked, hardened mastic round windows on a block
- The same joint failures repeated across a portfolio
- Draughts at frames across a block
Buildings close to stations like Hayes (Kent) station, 1.5 miles to the north-west of Keston, are often flats over shops, with frame mastic to keep sound.
Questions to ask before you book
- Whether primer will be used where the manufacturer specifies it
- What the guarantee covers, and for how long
- Can the work be phased to keep areas open?
- Whether old or failed sealant will be cut out, not overlaid
Looking after the joints
Your facilities or cleaning team can help the joints last. Share these points with them:
- Share your contractor requirements early
- Protect low-level joints in entrances
- Encourage occupiers to report problems at frames
- Check the asbestos register before any old mastic is disturbed
Keep records of when each building was resealed. It helps plan the next round and gives you a history.
One failed perimeter normally means others on the same building are close, so it pays to look at the whole elevation. A planned reseal saves repeated visits.
Frames, entrances and external joints in Keston
Blocks in London are normally run by managing agents, landlords or housing associations, with residents to notify and access to arrange. Our programme follows the access you agree with residents. There are three care or nursing homes within about 2 miles of Keston. Owners of care premises can bring window and door mastic into a phased programme planned around the home.
Churches, halls and community buildings such as Keston Parish Church are looked after by trustees and committees like any other owner, and their frames, doors and external joints need mastic renewed in time. Historic properties like Down House, 2.2 miles south-east of Keston, show the age of some local stock, where frame mastic must suit soft brick or stone.
Keston is about 3 miles south of Bromley, in Greater London. Anywhere in BR2, it works the same way: send details, get a fixed quote, we seal, and the work is guaranteed. Keston is one of 764 places we cover in Greater London. For work in that direction, see our London page (11 miles or so).
We cover the BR2 postcode districts. Streets here include Church Road, Greys Park Close and Heathfield Road, and sites on any of them can send details for a fixed quote. Just outside Keston, we also work 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). Nearby towns on our patch 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
Locally, jobs take us to sites close to South Park, Ravens Wood School and The Greyhound pub, among other places. The nearest railway station is Hayes (Kent) station, roughly 1.5 miles north-west of the centre. A little further out are 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.
Work for main contractors and building owners
We work for building owners and managing agents on everything from one building to a spread of sites. Several sites can go on one quote, which keeps the paperwork simple.
For main contractors, we work as the sealant subcontractor, on new build and refurbishment alike. Programme, specification and site rules come first, with CSCS-carded applicators on site.
When it isn’t the sealant
We seal joints; we don’t mend everything behind them. Sealant alone won’t deal with:
- Old mastic suspected of containing asbestos, which must be tested and dealt with by a specialist first
- Failed window or door frames, which need a window contractor
- Roof leaks, gutters or failed flashings that aren’t sealant joints
If you’re not sure, just speak to us on 01277 525 020 or send photos by email and we’ll give you a straight answer.
Where we work in Keston
- Window and door perimeters on blocks
- Balcony and threshold joints
- Communal entrances and stairwells
- External wall and movement joints
- Communal kitchens and washrooms
- Shopfronts below residential blocks
Towns and villages near Keston
What else we do in Keston
Site staff or a sealant specialist?
Site maintenance staff can often handle a short internal joint. The usual problems come from preparation: sealing over old material, sealing onto damp or dusty surfaces, or a product that can’t take the movement.
The visible bead is only part of the job. Backing rod, primer where specified and a joint designed to move with the building are easy to get wrong without experience.
How a job runs
When we get to site, we sign in, go through any site induction and check how permits are handled. Floors, finishes and fittings next to the joints are covered before anything is cut or cleaned, and the work usually takes a few days for most blocks, with larger programmes scheduled building by building. Most London premises stay occupied while we’re on site, so we agree zones and timings with the building or facilities manager. Phased work keeps the rest of the building in use.
- A building-by-building inspection lists the failed joints.
- The quote is fixed and split as suits you.
- Dates and areas are agreed so occupiers can be told.
- Failed sealant is removed and the faces prepared.
- Joints are resealed and tooled.
- Each building is checked and signed off with the 12-month guarantee.
Before we start on site
- Let us know about inductions and permits
- Point out parking and an unloading spot
- Send any specification or drawings in advance
Get a fixed quote
Tell us about the building, the joints and when you need the work done, and we’ll put a fixed quote together. The easiest way is to call 01277 525 020 or send photos by email.