Kent · England
New Build Mastic in Cotman's Ash
Problem with your new-build sealant joints in Cotman's Ash? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Worktop and upstand sealant coming away
- Beads laid onto grit and dust from the build
- Sealant work across a run of new homes
How we handle new build mastic in Cotman's Ash
New homes move as they dry out. Timber shrinks, plaster dries and baths and trays bed down, and sealant applied in a hurry at handover can split. If you have sealant that never bonded to the surface and messy sealant that spoils new finishes, we can help.
In a village or hamlet like Cotman's Ash, new homes are more likely to be a barn conversion or a handful of houses than a big estate. Every one needs its sealant and floor joints done properly, whatever the size of the site.
Your job is guaranteed for a year, as with all our work.
- Where
- Cotman's Ash (TN15)
- Region
- Kent
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Keeping the joints in good condition
Aftercare is simple, and it makes a real difference:
- Open a window or run the fan after bathing
- Wipe joints with warm soapy water
- Record problems with dated photos
- Wait for the cure time before using a resealed shower
Photograph failed sealant before it’s redone and keep the builder’s replies. It helps if anything else comes up during the warranty period.
Lifting sealant traps moisture and mould behind it. Resealing before mould gets in saves a harder job later.
Different surfaces, different methods
Windows and doors
Draughts around new frames are often a sealant gap. We look at the joints and reseal where needed.
Bathrooms and en suites
Trays and baths in new builds settle as they’re used. We reseal once the old bead is fully out.
Cotman's Ash: your questions answered
Do you cover smaller places like Cotman's Ash?
Yes, Cotman's Ash is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Kemsing station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before we start.
Who should fix failed sealant in a new build?
Start with your builder while their snagging or warranty period runs. If that doesn’t work out, we are happy to quote with our 12-month guarantee.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover Cotman's Ash, along with the rest of our area.
What information do you need?
A short description and the location, with pictures by email if possible. We’ll ask anything else we need to know.
Can you work on commercial sites?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We’ll give you the cure time for the product we used before we leave.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
What we do, step by step
There’s no need to move everything out before we come, just the space around the work. Everything nearby is protected, and the work takes a few hours in a single home for a typical job. In a small place like Cotman's Ash, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we work through your snagging list or plot schedule with you.
- The old bead comes out in full, with no layer left behind.
- Each joint is cleaned of dust and grit, then primed if required.
- We apply a sealant that suits each joint and tool it to a neat finish.
- Each area is checked and left with its cure time.
Before we arrive
- Let us know about parking restrictions
- Keep pets and children clear of the area while we work
- Mention any tricky access
Getting a quote
To get a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We’ll give you a clear quote before any work starts.
Advice
New build mastic around Cotman's Ash
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In and around Cotman's Ash, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Cotman's Ash is about 3 miles north-east of Sevenoaks, in Kent. We provide new build mastic to householders, landlords and businesses in Cotman's Ash. 922 places in Kent are on our list, from the larger towns to small villages. For nearby work, see our London page, about 19 miles away.
We work across the TN15 postcode area for new build mastic and the streets around it. If you are just outside Cotman's Ash, we cover Woodlands (1 mile north-east), Heaverham (1 mile south-east), Knatts Valley (1 mile north), Romney Street (1 mile north-west) and Kemsing (1 mile south-west). We also work in nearby towns such as Maidstone (13 miles east), Dartford (9 miles north), Sevenoaks (3 miles south-west), Royal Tunbridge Wells (13 miles south), Gravesend (10 miles north-east) and Tonbridge (8 miles south).
Near you in Cotman's Ash
Locally, jobs take us to homes and businesses close to The Rising Sun pub and Kemsing Down and the streets around them. The closest station to Cotman's Ash is Kemsing station, about 1.4 miles south. Well-known places in the area include Kemsing Castle Bank (0.9 miles south-west) and Sevenoaks Hospital (2.8 miles south-west). The countryside around Cotman's Ash includes Dryhill Nature Reserve.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Do you need new build mastic in Cotman's Ash?
Baths and trays settle under load once the home is lived in. A bath sealed empty drops slightly when filled, straining the joint and can tear.
Common reasons people contact us include:
- Skirting joints opening in the first winter
- Worktop and upstand sealant coming away
- Plot mastic for developers ahead of handover
- Shower seals failing in the first year or two
If you’ve bought a new home near Kemsing station, the sealant around baths, showers and frames is worth checking in the first year or two.
Comparing quotes
- How the colour is chosen
- How much experience the applicator has
- How the surfaces are prepared before sealing
- Is VAT in the price?
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Nearby places to Cotman's Ash
Other services in Cotman's Ash
Why it’s worth doing now in Cotman's Ash
If you’re still in the builder’s snagging or warranty period, ask them to put it right first. If it’s slow, or the same joint keeps failing, a proper reseal from a specialist is the next step. Older cottages and farmhouses around Cotman's Ash can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or drop us an email.
What you get with us
- Every job guaranteed for a year
- Any old sealant cut out fully, not covered over
- Approved under the ARBOMaster scheme
- A sealant colour to suit the surroundings
Take a look at our cost guide or what customers say.