Kent · England
External Mastic in Kings Hill
External mastic in Kings Hill from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Failed sealant between panels on a façade
- Sealant pulling away from one side of the joint
- Movement joints filled with mortar instead of sealant
How we handle external mastic in Kings Hill
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, leaving it bonded to two faces so it can move with the wall. If you have moss and dirt in joints with no sealant left and damp patches traced to an open external joint, we can put it right.
In and around Kings Hill, older properties sit alongside newer ones, each with its own outside joints. Older homes need their gutter and trim joints kept tight, newer ones their movement joints.
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.
- Place
- Kings Hill (ME19)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY sealant or a professional job?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Quotes for external mastic in Kings Hill
The quote reflects the job in front of us. We take into account:
- The product the joint needs
- Any working-time requirements on site
- The number of rooms or windows
- How much old sealant there is and how hard it is to remove
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we’ll go through it with you.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- If someone has resealed it before
- Where the property is
- The type of property
- The rough size of the job
We do not publish a price list. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or email us.
What the job involves on each surface
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. If that is happened, we rake it out and reseal it properly where it can be done safely.
Render joints
Render has movement joints and stop beads that need sealing. They’re resealed in a sealant that suits the render.
How the visit works
You do not need to clear the whole room or building, just the space around the work. Everything nearby is protected, and the job takes a few hours for a handful of joints, longer for a whole elevation in most cases. A visit to Kings Hill is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Let us know about stairs, lifts or work at height
- Mention any parking rules near the property
- Try not to wet indoor joints just before the visit
Getting a quote
To get a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear price before any work starts.
Read more
Common questions in Kings Hill
Can you do external mastic in Kings Hill?
Yes, Kings Hill is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
I let a flat near West Malling station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll send you a clear quote.
Why is there a gap in my brick wall?
Walls move with heat, cold and moisture, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
Will you leave a mess?
Tidy work is part of the job. We protect what’s around the joints, and the area is left clean when we finish.
Can a movement joint be filled with mortar?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. A flexible sealant is the right fill.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
How long does external mastic last?
It varies from wall to wall: sunny, exposed elevations and busy joints wear faster. A yearly look will tell you when they need doing. Every job carries our one-year guarantee.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We’ll tell you how long to leave the joint.
For landlords and businesses
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
Common problems we fix in Kings Hill
If plants are growing out of a joint, the sealant has generally failed or was never there. Roots and dirt hold water against the wall.
The most common problems we see are:
- Rigid filler in a joint that should flex
- Rain getting behind render or cladding at a joint
- Brick movement joints where the sealant has split
- Weeds or debris growing in open joints
Homes close to Church of St John the Baptist include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Before you book anyone
- How the colour is chosen
- Which sealant they’ll use, and why
- What happens if they find a problem under the old sealant
- Who does the work, and how experienced they are
What external mastic looks like in Kings Hill
Historic houses like Old Soar Manor (about 3.7 miles west) are a reminder that the area around Kings Hill 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. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For site and facilities teams at buildings such as Kings Hill School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Letting a property close to West Malling station? Then split movement joints are easy to miss on a rental until damp shows inside.
Kings Hill is about 5 miles west of Maidstone, in Kent. If you need external mastic in Kings Hill, please call 0345 464 0079 or send us an email for a quick quote. We are based in Crawley and cover Kent, Kings Hill included. We cover 922 towns and villages across Kent, from the larger towns to small villages. There’s also a page for London, about 27 miles away.
Our applicators cover all of ME19 for external mastic. That includes homes and businesses on Churchill Square, Townsend Square and Ruton Square and the roads around them. If you’re just outside Kings Hill, we cover Well Street (1 mile north-east), Red Hill (1 mile south-east), Wateringbury (1 mile south-east), West Malling (2 miles north) and Nettlestead (2 miles south). Further out, we also cover Maidstone (5 miles east), Sittingbourne (15 miles east), Dartford (14 miles north-west), Sevenoaks (9 miles west), Royal Tunbridge Wells (11 miles south-west) and Gravesend (11 miles north).
Landmarks near Kings Hill
In Kings Hill, that means homes and buildings near Manor Park Country Park and The Malling School and the streets around them. The nearest railway station is West Malling station, roughly 1.5 miles north-east. Other landmarks nearby include Maidstone Hospital (3.4 miles east) and Leybourne Castle (2.3 miles north).
Towns and villages near Kings Hill
Also in Kings Hill
How to look after the new joints
After the cure time, these simple habits help:
- Point out the joints to other trades
- Check external joints each spring
- Get split or bare joints resealed while the damage is small
- Keep water from gutters off the wall
Don’t paint over the new sealant unless we’ve said the product is paintable. Many exterior sealants are not designed to be painted, and paint can crack as the joint moves.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.