Kent · England
New-build mastic & snagging in Cold Harbour, Kent
We cover Cold Harbour for plot mastic for developers and snagging failed sealant in new homes. Old material cut out, joints cleaned and sealed neatly.
- Shower seals failing in the first year or two
- Frame joints opening as the plaster dries
- Cracks appearing as a new home settles
How we handle new build mastic in Cold Harbour
Developers send us the plot schedule and we work through it. We seal bathrooms, kitchens, windows, doors and skirting so plots are ready to hand over with a sealant suited to each area. We work on bathrooms & en suites, show homes and skirting & floors, and people most often call us about untidy sealant flagged on a snagging list and worktop and upstand sealant coming away.
Work in a small place like Cold Harbour just needs the journey and access planning, and once on site, the job is the same as anywhere.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Location
- Cold Harbour (ME17)
- Region
- Kent
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Ventilate bathrooms well, especially in the first year
- Avoid running a DIY bead over the old one
- Keep water off fresh sealant until it has cured
- Put sealant faults on your snagging list early
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.
Lifting sealant traps moisture and mould behind it. Dealing with it before it goes black saves a harder job later.
New homes and floors in Cold Harbour
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In and around Cold Harbour, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Cold Harbour is about 7 miles south-west of Faversham, in Kent. Across the ME17 area, our applicators can take on new build mastic. Our Kent coverage runs to 922 places, and Cold Harbour is one of them. There’s also a page for Chelmsford, about 37 miles away.
Postcode districts we cover here for new build mastic: ME17. Close by, we work in Warren Street (1 mile north-west), Payden Street (1 mile north-west), Lenham Heath (2 miles south-west), Charing Heath (2 miles south) and Lenham Forstal (2 miles south-west). Within a short drive, we also cover Maidstone (11 miles west), Ashford (8 miles south-east), Canterbury (14 miles east), Sittingbourne (7 miles north), Whitstable (14 miles north-east) and Faversham (7 miles north-east).
Around Cold Harbour
We work in homes and buildings around The Harrow pub and Spuckles and Kennelling Woods. The closest station to Cold Harbour is Charing station, roughly 2.3 miles south. Well-known places in the area include Newnham Castle (3.4 miles north).
Towns and villages near Cold Harbour
What else we do in Cold Harbour
Questions from Cold Harbour
Can you help a landlord with a rental near Charing station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Do you cover smaller places like Cold Harbour?
Yes. Cold Harbour is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We’ll tell you what we’re using and why.
Can I add another job to the visit?
Yes. Just list everything you need and you’ll get one quote.
How long before the joint can be used?
Different products cure at different speeds, so follow the cure time we give you.
Will it make a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
What colour sealant will you use?
Most bathroom joints are white or clear, but other colours are available. We match the colour to the finish before we begin.
Where is Mr Mastic based?
Our base is Crawley. Our area covers South East England, London and Scotland.
Leave it or put it right?
It often makes sense to do all the sealant items on a snagging list together. It’s one visit, one quote and one set of cure times. In a small place like Cold Harbour, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Why us?
- Old sealant always removed completely
- Colour picked to suit the job
- ARBOMaster approved applicator
- We leave the area clean and tidy
Take a look at what affects the cost and what customers say.
Can I do it myself?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
When to call us in Cold Harbour
New homes are full of moisture from plaster, screed and concrete, which takes a year or two to dry out. As it does, timber shrinks and joints open.
Keep an eye out for any of the following:
- Frame joints opening as the plaster dries
- Beads laid onto grit and dust from the build
- Gaps behind new kitchen upstands
- Gaps between new skirting and floors
For new homes near Charing station, it’s worth checking the sealant early, while snags are still fresh.
Comparing quotes
- How the joint is cleaned and prepared
- What the quote includes, VAT included or not
- Whether the sealant suits the joint
- Are they insured?
When something else is needed
To be straight with you, some problems need a different trade:
- Broken tiles or a split tray
- Deciding who is responsible under a builder’s warranty
- Leaks from pipes, valves or wastes, which need a plumber
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
Where we work in Cold Harbour
- Plot handovers
- Windows & doors
- Show homes
- Kitchens
- Bathrooms & en suites
- Skirting & floors
How it works
Good joint work is mostly preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours in a single home. For a village or hamlet like Cold Harbour, the journey is planned in advance: 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 any work starts.
- Old sealant is cut out and the joints cleaned.
- We make sure the joints are dry and prime them if needed.
- Baths are filled with water, then the new sealant is applied.
- The finished joints are checked and the cure times given.
How to prepare
- Plan for the work area to be out of bounds to pets and children
- Let us know about parking restrictions
- Mention if the joints have been sealed before
Getting a quote
If you’re in Cold Harbour and need new build mastic, call 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Advice
How we quote for new build mastic
For a quick quote, just ask. The main things that affect it are:
- The amount of work
- The product the joint needs
- Whether there’s mould to deal with
- How easy the joints are to reach
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Helping us quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- If someone has resealed it before
- Access, such as stairs, a lift or height
- Pictures of the joints, sent by email
- How many joints, rooms or windows are involved
To get a quote, phone 0345 464 0079 or email us with the location and a short description of the problem. We will give you a clear price before any work starts.