Kent · England
External & façade joints in Coldharbour, Kent
Problem with your movement joints in Coldharbour? We remove the old material, prepare the joints and seal them properly.
- Water getting into walls through failed joints
- Weeds or debris growing in open joints
- Panel joints letting water in
How we handle external mastic in Coldharbour
On houses, flats and commercial buildings across Coldharbour, we reseal joints in brickwork, render, cladding and façade panels. Every joint gets the same careful preparation: clean, sound faces and a controlled depth. Common call-outs are for joints with sealant missing in places and cracked joints where brick meets render or frames, on render & cladding joints, joints between brick and frames and brickwork movement joints.
Around Coldharbour, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
Our work is backed for twelve months, in Coldharbour and everywhere else we cover.
- Place
- Coldharbour (TN11)
- Region
- Kent
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What external mastic looks like in Coldharbour
Historic houses like Ightham Mote (about 2.2 miles north) are a reminder that the area around Coldharbour has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you look after a building such as St Margaret Clitherow Catholic Primary School, its movement joints, gutters and trims need looking after like any other building’s. For an older house near a landmark such as Parish Church of St John, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Coldharbour is about 2 miles north of Tonbridge, in Kent. From the centre of Coldharbour to the outskirts, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Across Kent, we cover 922 places, and Coldharbour is one of them. You can also see our page for Crawley, roughly 21 miles from Coldharbour.
Work in TN11 is quoted and booked the same way as anywhere else. Neighbouring places we cover for external mastic include 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). We also work in nearby towns such as 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
In Coldharbour, that means homes and buildings near Hugh Christie Technology College and The Flying Dutchman Public House. The closest station to Coldharbour is Hildenborough station, roughly 1.6 miles south-west of the centre. Nearby you will also find 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.
Work for landlords, hotels and businesses
Landlords and agents in Coldharbour can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we’re fully insured.
When it isn’t the sealant
We will always be straight with you, so here’s what new sealant will not do:
- Movement that is more than a sealant joint can take
- Cracking across the wall rather than at a joint
- Walls that need new movement joints cut into them
If you’re not sure, just phone 0345 464 0079 or email us and we will give you a straight answer before booking.
Surfaces we seal
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Façade panels
Common questions in Coldharbour
Can you do external mastic in Coldharbour?
Yes, Coldharbour is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job.
Do you cover smaller places like Coldharbour?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Why is there a gap in my brick wall?
It’s a deliberate gap that lets the wall expand and contract without cracking. It should be filled with flexible sealant, never mortar.
Will the old sealant be removed?
Yes, every time. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
Do you work for letting agents?
Yes, regularly. We can quote for several properties at once, and between tenancies is a good time for the work.
Do you use backing rod?
Backing rod goes into deeper joints as a matter of course. It controls the depth and stops the sealant bonding to the back, so the joint can move.
How do you reach high-level joints?
It depends on the height and the site. Low-level joints are straightforward; for higher ones, send details and we’ll confirm the access.
Can you quote for more than one area?
Yes, we can. Several rooms, windows or areas can go on one quote.
Quotes for external mastic in Coldharbour
There’s no set price list, because no two jobs are the same. The quote depends on:
- How much there is to do
- Whether there’s mould to deal with
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote and we will talk you through it.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- The address or postcode of the job
- A few pictures by email, if you can
- How we’d reach the joints
- Whether it has been sealed before
Need a quote? Please ring 0345 464 0079 or email us with a few details. We will explain what we’d do and give you a clear quote before work begins.
How the visit works
On the day, we look over the joints with you first, so you know exactly what we are doing. We protect the surfaces around the joints before we start. Most jobs take anything from a few hours to several days, depending on the building. Somewhere like Coldharbour needs a little journey planning: 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 start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Before we arrive
- Tell us about any previous sealing or DIY attempts
- Where the joints are inside, avoid wetting them before we arrive
- Mention any tricky access
Getting a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.
Advice
Nearby places to Coldharbour
Other services in Coldharbour
What we are called out for in Coldharbour
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
Signs it’s time to call us include:
- Panel joints letting water in
- Gaps where render, brick and frames meet
- Old sealant gone brittle and cracked
- Joints where the bead has come unstuck
Letting a property close to Hildenborough station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What your quote should include
- How long to leave it before use
- Is VAT in the price?
- What happens if the job turns out different
- How the colour is chosen
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Check the sealant is paintable before painting near it
- Don’t let climbing plants root in the sealant
- Avoid pressure-washing directly into sealant joints
- Never let anyone fill a movement joint with mortar
Only paint over the joint if we’ve confirmed the sealant can take paint. Many exterior sealants aren’t designed to be painted.
Act while the splits are small. Then it’s a straightforward cut-out and reseal before water has had years to get in.
Surface by surface
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible in all weathers.
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. If that’s happened, we rake it out and reseal it properly where it can be done safely.