Kent · England
Chevening External Mastic
External mastic across Chevening and nearby, with old sealant always removed completely and a 12-month guarantee.
- Failed sealant between panels on a façade
- Rain getting behind render or cladding at a joint
- Movement joints with cracked, split or missing sealant
What we can’t put right
New sealant can’t fix everything, and we’d rather say so up front. Sealant won’t put right:
- Movement that is more than a sealant joint can take
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Walls that need new movement joints cut into them
If you are not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer before booking.
Where we work in Chevening
- Brickwork movement joints
- Render & cladding joints
- Joints between brick and frames
- Copings & trims
- Concrete & block
- Façade panels
How we handle external mastic in Chevening
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we’ll confirm what access is needed. We’re often asked to deal with old sealant gone brittle and cracked and weeds or debris growing in open joints, on render & cladding joints, joints between brick and frames and brickwork movement joints.
External sealant needs dry, clean surfaces, so work around Chevening is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
Your job is guaranteed for a year, as with all our work.
- Location
- Chevening (TN14)
- Wider area
- Kent
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
External mastic in Chevening: local notes
Historic houses like Quebec House (about 3.3 miles south-west) are a reminder that the area around Chevening has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near Church of St Botolph, the joints between older walls, newer extensions and the roofline need a sealant that can move. If you look after a building such as Combe Bank School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Chevening is about 3 miles north-west of Sevenoaks, in Kent. We carry out external mastic for homes and businesses in Chevening and the surrounding area. Across Kent, we cover 922 places, Chevening among them. We also work in London, about 17 miles from Chevening.
We work across the TN14 postcode area for external mastic and the streets around it. We also cover Chipstead (1 mile south-east), Sundridge (2 miles south), Dunton Green (2 miles east), Bessels Green (2 miles south-east) and Riverhead (2 miles south-east). Within a short drive, we also cover Dartford (11 miles north), Sevenoaks (3 miles south-east), Royal Tunbridge Wells (13 miles south-east), Gravesend (14 miles north-east), Tonbridge (9 miles south-east) and Northfleet (13 miles north-east).
Landmarks near Chevening
Locally, jobs take us to homes and businesses close to Trinity School, among other places. For rail, the closest station is Dunton Green station, roughly 1.7 miles east. Nearby you will also find Sevenoaks Hospital (2.8 miles east) and Kemsing Castle Bank (4.2 miles east). Green spaces nearby include Dryhill Nature Reserve and Betsom's Hill.
Places near Chevening
Also in Chevening
Landlords, agents and businesses in Chevening
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Leave it or put it right?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. In a small place like Chevening, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
What it costs depends on how much there is to do, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
Why book with us
- Approved under the ARBOMaster scheme
- Anti-fungal sanitary silicone in wet areas
- A choice of colours where the product allows
- Quality sealants from Arbo and Everbuild
What affects the quote in Chevening
Call for a quick quote. What matters most is:
- Whether old sealant or filler has to be cut out
- The size of the job
- The number of rooms or windows
- Any working-time requirements on site
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.
What we need to know
To help us quote quickly, let us know:
- If someone has resealed it before
- What’s wrong with the joints now
- Pictures of the joints, sent by email
- Whether it’s a home or a business
There’s no standard price list. Instead, we give you a clear price for your job. To get started, call 0345 464 0079 or send us an email.
What we are called out for in Chevening
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
Any of these means the joints need attention:
- Joints pointed up with cement by mistake
- Sealant pulling away from one side of the joint
- Panel joints letting water in
- Old sealant gone brittle and cracked
Letting a property close to Dunton Green station? Then split movement joints are easy to miss on a rental until damp shows inside.
Questions to ask before booking
- Which sealant they’ll use, and why
- Whether all the old sealant comes out first
- When the joint can take water or movement
- How the joint is cleaned and prepared
The process
On the day, there’s very little for you to do. Show us the job and we will take it from there. The job generally takes a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Chevening, 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.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Plan for the work area to be out of bounds to pets and children
- For indoor joints, keep the area dry beforehand if you can
- On commercial sites, let us know about site rules
Getting a quote
For external mastic in Chevening, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.
Advice
Chevening questions
Can you help a landlord with a rental near Dunton Green station?
Yes, we work for letting agents and landlords. Just ring 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear price.
Is Chevening in your area for external mastic?
Yes, Chevening 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’ll give you a clear quote.
Can you reach joints on upper floors?
It depends on the building. Send us photos and a rough idea of the height, and we will confirm what access is needed.
Do you use backing rod?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides so it can flex with the joint.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
When is the sealant fully cured?
Different products cure at different speeds, so follow the cure time we give you.
Can you match the colour of my brickwork?
The sealant colour is picked to suit the wall. Exterior sealants come in a good range of colours.
Surface by surface
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. Their movement joints are sealed over backing rod with a flexible sealant.
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best year round.