Kent · England
New-build mastic & snagging in Coursehorn, Kent
Problem with your new-build sealant joints in Coursehorn? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Internal frame sealant that has split
- Gaps opening as the house dries out and settles
- Shower seals failing in the first year or two
New build mastic in Coursehorn
For builders and developers, we work through plots to the schedule you give us. Bathrooms, en suites, kitchens, frames and skirting are sealed ready for handover with a sealant suited to each area. If you have sealant work across a run of new homes and leaking shower tray seals in a new home, we can put it right, on skirting & floors, kitchens and show homes alike.
For a small place like Coursehorn, the journey and access are planned in advance, and the work itself is the same as on any site.
There’s a 12-month guarantee on every job, large or small.
- Where
- Coursehorn (TN17)
- Region
- Kent
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Coursehorn questions
Can you do new build mastic in Coursehorn?
Yes. Our work covers London and the South East, and Coursehorn is part of that. You can phone 0345 464 0079 or email us and tell us what needs doing, and we’ll give you a clear quote.
Is new build mastic in Coursehorn guaranteed?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Can I add another job to the visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
Are you insured?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Can I send you my snagging list?
Yes. Photos of each sealant item help us quote. If something is not sealant, we will say so.
Can tenants book the work?
We’re happy to deal with the tenant, landlord or agent. Just make sure your landlord agrees.
Do you work for developers?
Yes. We take on second-fix sealant work across new plots. Good preparation keeps snagging to a minimum.
What colour sealant will you use?
White and clear are the most common, but sealant comes in other colours too. We choose one to suit the room.
Signs you need new build mastic in Coursehorn
New homes are full of moisture from plaster, screed and concrete, and it dries out over the first couple of years. Drying timber shrinks and pulls joints apart.
It’s worth asking for a quote if you see:
- Untidy sealant flagged on a snagging list
- New-build shower sealant that has already split
- Plot mastic for developers ahead of handover
- Gaps opening as the house dries out and settles
Whether the job is in Coursehorn itself or nearby, the right material for each joint matters as much as a neat finish.
What to look for in a quote
- What happens if they find a problem under the old sealant
- Which colour the sealant will be
- Is the old sealant removed completely?
- How the joint is cleaned and prepared
When it isn’t the sealant
To be straight with you, some problems need a different trade:
- Deciding who is responsible under a builder’s warranty
- Leaks from pipes, valves or wastes, which need a plumber
- Cracking that points to a structural problem
If in doubt, ring 0345 464 0079 or email us and we will say what we think before you book.
Joints and surfaces we work on
- Show homes
- Plot handovers
- Skirting & floors
- Bathrooms & en suites
- Kitchens
- Windows & doors
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will give you a quote.
Towns and villages near Coursehorn
What else we do in Coursehorn
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What the job involves on each surface
Windows and doors
A draught at a new window can be a missed or failed joint. We look at the joints and reseal where needed.
Show homes
Bathrooms, kitchens and frames in show homes are sealed or resealed to a neat finish to a tidy standard. Tell us when the home is open so we can plan around it.
What affects the cost of new build mastic
Your quote is based on your job. We look at:
- Which sealant suits the joint
- Whether there’s mould to deal with
- How much old sealant there is and how hard it is to remove
- Whether the work is at height
We do not show prices on the website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or email us.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- If it’s domestic, commercial or a hotel
- Roughly how big the job is
- Whether it has been sealed before
- What the problem is, such as mould, gaps, leaks or cracking
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved.
New build mastic in Coursehorn: local notes
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Around Coursehorn, as everywhere, new build mastic is only as good as the preparation behind it.
Coursehorn is about 12 miles south of Maidstone, in Kent. Jobs in Coursehorn get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. 922 places in Kent are on our list, from the larger towns to small villages. Our Crawley page covers work nearby (32 miles or so).
Our applicators cover all of the TN17 postcode area for new build mastic. Neighbouring places we cover for new build mastic include Baker's Cross (1 mile west), Cranbrook (1 mile west), Swattenden (1 mile south-west), Hartley (2 miles south-west) and Benenden (2 miles south-east). Larger places within reach include Maidstone (12 miles north), Ashford (14 miles east), Royal Tunbridge Wells (13 miles west), Tonbridge (14 miles north-west), Kings Hill (14 miles north-west) and Foley Park (13 miles north).
Landmarks near Coursehorn
Around Coursehorn, our work takes us to homes and buildings near White Horse pub, Cranbrook Church of England Primary School and Crane Valley and the streets around them. Nearby you’ll also find Sissinghurst Castle (1.7 miles north-east) and Sissinghurst Castle (1.7 miles north-east).
What happens on the day
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours for most snagging lists, longer for a run of plots, and the area is left clean. For a village or hamlet like Coursehorn, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided 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.
- Surfaces are cleaned of building dust and primed where needed.
- A sealant chosen for each area goes in and is tooled smooth.
- Each area is checked and left with its cure time.
Before we arrive
- Plan for the work area to be out of bounds to pets and children
- Let us know about earlier repairs to the joints
- Move anything stored near the joints
Getting a quote
Getting a quote is simple: let us know the job and the location and its rough size. Photos by email help us understand the job.