Greater London · England
New Build Mastic in Keston
Plot mastic for developers and snagging failed sealant in new homes in Keston, with a 12-month guarantee on every job. Ask us for a quote.
- Sealant applied over dusty or wet surfaces
- Cracked caulk along new skirting
- Sealant work across a run of new homes
New build mastic in Keston
Developers send us the plot schedule and we work through it. Bathrooms, en suites, kitchens, frames and skirting are sealed ready for handover. If you have gaps behind new kitchen upstands and untidy sealant flagged on a snagging list, we can put it right.
From brand-new flats to converted terraces with new flooring, London has every kind of floor. Wherever a floor meets a wall, a skirting or a threshold, the joint has to allow for movement.
There’s a 12-month guarantee on every job, whatever its size.
- Where
- Keston (BR2)
- Region
- Greater London
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
For landlords and businesses
If you manage several properties in or around Keston, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
Housing providers, facilities teams and property managers book us too in Keston and across Greater London. Several sites can be quoted together, and we are fully insured for the work.
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Leaking fittings rather than failed sealant
- Your warranty claim itself, which is between you and the builder
- Structural cracks in walls or ceilings
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think.
What we seal
- Windows & doors
- Skirting & floors
- Bathrooms & en suites
- Plot handovers
- Show homes
- Kitchens
What the job involves on each surface
Kitchens
Worktop, upstand and sink joints in new kitchens often get a hurried bead. We take it out and reseal neatly, colour-matched where it shows.
Plot handovers
We work through plots to your schedule, sealing each room ready for handover. Joints are prepared properly before sealing.
What affects the cost of new build mastic
Your quote is based on your job. We look at:
- Any mould that needs treating
- How much old sealant there is and how hard it is to remove
- The amount of work
- Which sealant suits the joint
Combining jobs into one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
What to tell us for a quote
What to tell us when you ask for a quote:
- What’s wrong with the joints now
- If someone has resealed it before
- Access, such as stairs, a lift or height
- If it’s domestic, commercial or a hotel
For new build mastic in Keston, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Signs you need new build mastic in Keston
The wrong product is sometimes used in the wrong place: caulk where water collects, or a rigid product on a moving joint. Neither lasts long.
Keep an eye out for any of the following:
- Gaps opening as the house dries out and settles
- Gaps behind new kitchen upstands
- Sealant work across a run of new homes
- Smeared, uneven beads picked up at snagging
As a London address, Keston can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
What your quote should include
- How the surfaces are prepared before sealing
- Whether they seal over old material or remove it
- How much experience the applicator has
- How the colour is chosen
New build mastic around Keston
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent.
If you’ve bought a new home near Hayes (Kent) station, the sealant around baths, showers and frames is worth checking in the first year or two.
Keston is about 3 miles south of Bromley, in Greater London. Jobs in Keston get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Keston is one of 764 towns and villages in Greater London we cover. We also work in London, about 11 miles from Keston.
Jobs for new build mastic in BR2 is quoted and booked the same way as anywhere else. New build mastic is available to properties on Church Road, Greys Park Close and Heathfield Road and the roads around them. Neighbouring places we cover for new build mastic include 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). Larger places 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).
Local landmarks in Keston
Typical jobs here are in homes near South Park, Ravens Wood School and The Greyhound pub, among other places. The nearest railway station is Hayes (Kent) station, about 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). Not far away are West Kent Golf Course nature reserve and Summer Hill.
Keston: your questions answered
Do you cover Keston for new build mastic?
Yes, Keston is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or drop us an email and let us know what needs doing, and we will send you a clear quote.
Do you work for landlords with property near Hayes (Kent) station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
When is the best time to reseal in a new build?
For failed seals that let water through, the best time is now. Cosmetic gaps can wait until the first year or two of movement has passed.
Can you do plot mastic on a new development?
Yes. We take on second-fix sealant work across new plots. Good preparation keeps snagging to a minimum.
Is there any odour?
Some sealants have a smell while they cure. Opening a window helps.
Can you reseal over the builder’s sealant?
No. The old sealant is cut out fully, the joint cleaned and primed where needed, before resealing.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access.
How much does new build mastic cost in Keston?
Every job is different, so each one gets its own quote. To get one, phone 0345 464 0079 or send us an email and let us know what needs doing and where.
Nearby places to Keston
What else we do in Keston
What we do, step by step
We keep the work tidy and contained to the joints we’re treating, so you can get on with your day. The job normally takes anything from a few hours to several days, depending on the number of plots, and we tell you how long to leave it before we go. In a London area like Keston, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- First we work through your snagging list or plot schedule with you.
- Failed or untidy sealant is cut out completely.
- Surfaces are cleaned of building dust and primed where needed.
- A sealant chosen for each area goes in and is tooled smooth.
- Finally, each room is checked and you are given the cure time.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- On commercial sites, let us know about site rules
- Tell us about any water getting in
How to get a quote
Every job is quoted individually, so start by telling us what you need. Just call 0345 464 0079 or drop us an email with the details and send photos if you have them.
Related advice
Should I try it myself first?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.