Kent · England
Dunk's Green New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes for householders, landlords and businesses in Dunk's Green. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Beads laid onto grit and dust from the build
- Joints pulling apart as timber shrinks
- Messy sealant that spoils new finishes
How we handle new build mastic in Dunk's Green
Some owners wait for the first year’s movement before having joints redone. That makes sense for small gaps that are just cosmetic, but a seal that is letting water through needs doing now. We are often asked to deal with sealant that never bonded to the surface and leaking shower tray seals in a new home, across plot handovers, bathrooms & en suites and windows & doors.
Around Dunk's Green, older homes often have timber floors that move through the year, so skirting and threshold joints need a flexible sealant rather than a rigid filler.
A 12-month guarantee comes as standard, so you are not left on your own once the job is done.
- Location
- Dunk's Green (TN11)
- Region
- Kent
- Cover
- 12 months on all our work
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
The process
The work is kept neat and contained to the joints we are treating. Expect the work to take anything from a few hours to several days, depending on the number of plots. Somewhere like Dunk's Green needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We go through the snagging list or plot schedule and agree the joints to do.
- Failed or untidy sealant is cut out completely.
- Each joint is cleaned of dust and grit, then primed if required.
- New sealant suited to each joint is applied and tooled neatly.
- Each area is checked and left with its cure time.
Before we arrive
- Mention any tricky access
- Plan for the work area to be out of bounds to pets and children
- On commercial sites, let us know about site rules
Get a quote
For new build mastic in Dunk's Green, call 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Advice
Common questions in Dunk's Green
Is Dunk's Green within the area you cover?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you cover Dunk's Green for new build mastic?
Yes. Our work covers London and the South East, and Dunk's Green is part of that. You can call 0345 464 0079 or email us and let us know what needs doing.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Dunk's Green, along with the rest of our area.
Is it worth resealing while the house is still settling?
If the seal has failed and water is getting in, do it now. Hairline cosmetic gaps can wait until the house has settled.
Should I go to my builder first?
While the snagging or warranty period runs, the builder should be your first contact. If they’re slow or the fix doesn’t last, we can help.
How do I get a quote for new build mastic in Dunk's Green?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before any work starts.
Is the work guaranteed?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we’ll put it right.
How long does new build mastic take?
Typically it takes anything from a few hours to several days, depending on the number of plots. Bigger jobs take longer, and we will tell you how long to expect.
Looking after it afterwards
Joint life depends on how it’s used and looked after. We suggest:
- Report sealant problems to your builder during the snagging period
- Get a leaking seal dealt with straight away
- Wipe joints with warm soapy water
- Ventilate bathrooms well, especially in the first year
Keep the bathroom ventilated, especially in the first year. Run the fan or open a window after bathing to help keep mould away.
A seal that splits early is often a sign of movement. Have it resealed, and the tray or bath checked, before it gets worse.
Honest limits
To be straight with you, some problems need a different trade:
- Settlement cracks that need a surveyor
- Leaks from pipes, valves or wastes, which need a plumber
- A tray or bath that isn’t properly supported, until it’s fixed
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly.
What we seal
- Plot handovers
- Kitchens
- Skirting & floors
- Bathrooms & en suites
- Windows & doors
- Show homes
Work for landlords, hotels and businesses
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
Common problems we fix in Dunk's Green
Later trades and the final clean can damage fresh sealant. If it’s disturbed before curing, the joint can be left weak.
Common reasons people contact us include:
- Plot mastic for developers ahead of handover
- Sealant applied over dusty or wet surfaces
- Gaps behind new kitchen upstands
- Gaps opening as the house dries out and settles
In and around Dunk's Green, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Questions to ask before booking
- Who does the work, and how experienced they are
- What the cure time is
- Whether all the old sealant comes out first
- What happens if they find a problem under the old sealant
Why deal with it now?
Small cosmetic gaps can wait for the house to settle, but water getting through cannot. Not sure whether yours can wait? You can phone 0345 464 0079 or send us an email with a few photos. Older cottages and farmhouses around Dunk's Green can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
The cost depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. You’ll have a clear quote before any work starts, so you know where you stand.
Why choose Mr Mastic in Dunk's Green
- 180+ five-star Google reviews
- Experience in homes, commercial sites and hotels
- White, clear, grey or another colour, product permitting
- Anti-fungal silicone where joints get wet
See our cost guide or customer reviews.
What else we do in Dunk's Green
New homes and floors in Dunk's Green
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For new homes near Borough Green & Wrotham station, it’s worth checking the sealant early, while snags are still fresh.
Dunk's Green is about 4 miles north of Tonbridge, in Kent. Our applicators cover new build mastic for homes and businesses in Dunk's Green. Our area takes in 922 places across Kent, large and small. For nearby work, see our London page.
All of TN11 is covered for new build mastic. Neighbouring places we cover for new build mastic include Plaxtol (1 mile north), Roughway (1 mile east), Claygate Cross (2 miles north), Crouch (2 miles north) and Pittswood (2 miles south). Larger places within reach include Maidstone (10 miles east), Dartford (14 miles north), Sevenoaks (6 miles west), Royal Tunbridge Wells (8 miles south), Gravesend (13 miles north) and Tonbridge (4 miles south).
What’s near Dunk's Green
Typical jobs here are in homes near Hadlow Rural Community School, The Kentish Rifleman Public House and Ivy Hatch Nature Reserve. The closest station to Dunk's Green is Borough Green & Wrotham station, about 2.8 miles north of the centre. Well-known places in the area include Tonbridge Cottage Hospital (5.3 miles south) and Ightham Court (3.1 miles north). For a walk, there’s Barden Lake.