Kent · England
New-build mastic & snagging in Coldharbour, Kent
Problem with your new-build sealant joints in Coldharbour? We remove the old material, prepare the joints and seal them properly.
- Worktop and upstand sealant coming away
- Beads laid onto grit and dust from the build
- Gaps opening as the house dries out and settles
What affects the cost of new build mastic
Call for a quick quote. The main things that affect it are:
- Mould in or behind the old joints
- Access and height
- The product the joint needs
- When we can work, for business premises
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs. Call for a quick quote and we’ll go through it with you.
Asking for a quote
Photos help, but a description is a good start. Try to tell us:
- What’s wrong with the joints now
- If it’s domestic, commercial or a hotel
- Where the job is, and your postcode
- Whether it has been sealed before
For new build mastic in Coldharbour, ring 0345 464 0079 or send us an email. Tell us what the problem is and where, and you’ll get a clear quote before work begins.
New build mastic for homes and businesses in Coldharbour
New homes move as they dry out. Timber shrinks, plaster dries and baths and trays bed down, so sealant that was laid quickly before handover often cracks. If you have shower seals failing in the first year or two and cracked caulk along new skirting, we can put it right, whatever the surface.
Work in a small place like Coldharbour just needs the journey and access planning, and once on site, the job is the same as anywhere.
Big or small, it’s backed by our one-year guarantee.
- Place
- Coldharbour (TN11)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Why it’s worth doing now in Coldharbour
Water getting past a failed seal in a new build reaches walls and floors that are still settling. Dealing with it early keeps the damage away from ceilings, floors and finishes. Where a wall is exposed, as many are in small places like Coldharbour, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or send us an email and we will talk you through it.
Why Coldharbour customers choose us
- Colour agreed with you before work begins
- One-year guarantee on every job
- A sealant colour to suit the surroundings
- A choice of colours where the product allows
Questions from Coldharbour
Do you work for landlords with property near Hildenborough station?
Yes, we work for landlords and letting agents. Just ring 0345 464 0079 or email us and tell us about the property, and we’ll send you a clear quote.
Is Coldharbour in your area for new build mastic?
Yes, Coldharbour is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
What colour sealant will you use?
It depends on the joint: white or clear in most bathrooms, and a colour to suit worktops, frames and floors elsewhere. We agree the colour before we start.
When is the best time to reseal in a new build?
Any seal that’s leaking should be redone right away. Cosmetic gaps can wait until the first year or two of movement has passed.
Where is Mr Mastic based?
Our base is in Crawley, and we cover South East England, London and all of Scotland.
Does someone need to be in?
That depends on where the joints are. For work indoors, someone needs to let us in, and for outside work we will agree access with you when we book.
Is it messy?
Tidy work is part of the job. We protect what’s around the joints, and we clear up when we’re done.
When it is not the sealant
To be straight with you, there are a few things sealant won’t fix:
- Your warranty claim itself, which is between you and the builder
- Leaking fittings rather than failed sealant
- Movement caused by a poorly fitted tray or bath
If in doubt, call 0345 464 0079 or email us and we will say what we think before booking.
Joints and surfaces we work on
- Show homes
- Bathrooms & en suites
- Kitchens
- Plot handovers
- Windows & doors
- Skirting & floors
Landlords, agents and businesses in Coldharbour
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
We work for letting agents and landlords as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
What new build mastic looks like in Coldharbour
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For new homes near Hildenborough station, it’s worth checking the sealant early, while snags are still fresh. Around Coldharbour, as everywhere, new build mastic is only as good as the preparation behind it.
Coldharbour is about 2 miles north of Tonbridge, in Kent. Every kind of property in Coldharbour is covered for new build mastic, old or new, large or small. The work is guaranteed for a year. Our area takes in 922 places across Kent, from the larger towns to small villages. Our Crawley page covers work nearby.
Every address in TN11 is within our area for new build mastic. Close by, we work in Hildenborough (1 mile south-west), Hilden Park (1 mile south), Watt's Cross (1 mile west), Budds (1 mile north) and Stocks Green (2 miles south-west). Within a short drive, we also cover Maidstone (12 miles east), Dartford (15 miles north), Sevenoaks (5 miles north-west), Royal Tunbridge Wells (6 miles south), Gravesend (15 miles north) and Northfleet (15 miles north).
What’s near Coldharbour
We work in homes and buildings around Hugh Christie Technology College and The Flying Dutchman Public House. The nearest railway station is Hildenborough station, about 1.6 miles south-west of the centre. A little further out are Tonbridge Castle (2.2 miles south) and The Milne Museum (2 miles south). For a walk, there’s Tudeley Woods RSPB reserve and Barden Lake.
Keeping the joints in good condition
Aftercare is simple:
- Put sealant faults on your snagging list early
- Don’t wait for the house to settle if water is getting through
- Open a window or run the fan after bathing
- Avoid scourers and strong chemicals on sealant
Watch the joints as the house settles. Small gaps can appear as the house dries, and they’re simple to reseal once movement has slowed.
Do not let the snagging period run out with sealant problems unreported. Once it ends, the repair may be down to you so report it promptly.
How it works
Once we are on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes anything from a few hours to several days, depending on the number of plots. Somewhere like Coldharbour needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- Each joint is checked for movement before we start.
- Old sealant is cut out and the joints cleaned.
- We make sure the joints are dry and prime them if needed.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- The finished joints are checked and the cure times given.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Keep pets and children clear of the area while we work
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
Should I try it myself first?
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
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 does not work out, we can still put it right.