Kent · England
External Mastic in Colt's Hill
Sealing brickwork movement joints, render, cladding and façade joints for Colt's Hill, backed by a 12-month guarantee. Ask us for a quote.
- Joints where the bead has come unstuck
- Moss and dirt in joints with no sealant left
- Failed seals between different materials
Quotes for external mastic in Colt's Hill
For a quick quote, just ask. The main things that affect it are:
- Whether there’s mould to deal with
- Which sealant suits the joint
- The old material and how stubborn it is
- The size of the job
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, phone 0345 464 0079 or email us for an honest opinion and a quote.
What we need to know
To help us quote quickly, please include:
- What the problem is, such as mould, gaps, leaks or cracking
- The address or postcode of the job
- Whether it’s a home or a business
- Access, such as stairs, a lift or height
If you are in Colt's Hill and need external mastic, phone 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before any work starts.
External mastic in Colt's Hill, done properly
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Some surfaces need a primer before sealing, and we don’t skip that step. If you have hard, crazed mastic that has stopped moving and sealant that has lost its bond to the brick or render, we can help, on façade panels, joints between brick and frames and copings & trims alike.
Outside joints can only be sealed when they’re dry, so work in Colt's Hill is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
You get a one-year guarantee, the same in Colt's Hill as everywhere else we work.
- Place
- Colt's Hill (TN12)
- Wider area
- Kent
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Can I do it myself?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
Landlord and commercial work in Colt's Hill
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together, and we’re fully insured for the work.
Hotels need rooms back in use, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
Outside joints around Colt's Hill
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Schools such as Capel Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s. Homes close to Five Oak Green Church include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
Colt's Hill is about 4 miles south-east of Tonbridge, in Kent. If you need external mastic in Colt's Hill, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We are based in Crawley and cover Kent, Colt's Hill included. Our Kent coverage runs to 922 places, and Colt's Hill is one of them. For nearby work, see our Crawley page.
Here we cover the TN12 postcode area for external mastic. We cover properties on Colts Hill and Maidstone Road and the roads around them. We also cover the places around Colt's Hill: Capel (1 mile west), Five Oak Green (1 mile north), Paddock Wood (1 mile east), Matfield (1 mile south-east) and Whetsted (1 mile north-east). Further out, we also cover Maidstone (10 miles north-east), Sevenoaks (11 miles north-west), Royal Tunbridge Wells (5 miles south-west), Tonbridge (4 miles north-west), Kings Hill (7 miles north) and Foley Park (11 miles north-east).
Local landmarks in Colt's Hill
Locally, jobs take us to homes and businesses close to The Dovecote Inn, Foal Hurst Wood and Mascalls School. For rail, the closest station is Paddock Wood station, roughly 1.5 miles north-east of the centre. A little further out are Tonbridge Castle (4.1 miles north-west) and The Hop Farm Museum (2.3 miles north-east). For a walk, there’s Barden Lake and Tudeley Woods RSPB reserve.
Places near Colt's Hill
What else we do in Colt's Hill
What happens on the day
On the day, we look over the joints with you first. We protect the surfaces around the joints before any work begins. The work normally takes anything from a few hours to several days, depending on the building. In a small place like Colt's Hill, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Tell us if parking is tricky
- Mention if the joints have been sealed before
- Try not to wet indoor joints just before the visit
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. When it suits you, call 0345 464 0079 or send us an email.
Advice
Surface by surface
Joints between dissimilar materials
Different materials may need different primers. We prepare both faces so the sealant bonds properly.
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. We reseal them with a sealant suited to the panel material.
What happens if it’s left?
Mortar or ordinary filler might look like a quick way to close an open joint, but it stops the joint moving. The movement then cracks the brickwork or render nearby. The correct repair is a flexible sealant with the right backing. In a small place like Colt's Hill, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What you get with us
- Over 20 years’ experience
- Any old sealant cut out fully, not covered over
- Sanitary silicone with an anti-fungal additive in wet areas
- 180+ five-star Google reviews
Read our cost guide or customer reviews.
Colt's Hill questions
Do you cover smaller places like Colt's Hill?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
I let a flat near Paddock Wood station. Can you help?
Yes. We work for landlords and agents as well as homeowners, and several properties can be quoted together. You can call 0345 464 0079 or email us with the details for a clear quote.
Is the work guaranteed?
Yes, always. Each job is guaranteed for twelve months.
What does external mastic cost?
Every job is different, so each one gets its own quote. For a quick quote, phone 0345 464 0079 or email us with a short description of the job.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access.
Do the sealants smell?
Some sealants have a smell while they cure, which fades as it sets. Opening a window helps.
When is the sealant fully cured?
Cure times vary by product and the conditions. Before we leave, we will tell you the cure time.
Can I do it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
When to call us in Colt's Hill
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
People normally contact us when they notice one of these:
- Plants rooting in failed movement joints
- Failed sealant between panels on a façade
- Sealant pulling away from one side of the joint
- Brick movement joints where the sealant has split
Rented homes near Paddock Wood station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What your quote should include
- What the cure time is
- Whether the sealant suits the joint
- What happens if the job turns out different
- What guarantee comes with the work