Kent · England
External Mastic in Sevenoaks Weald
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Sevenoaks Weald. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Cracked joints where brick meets render or frames
- Damp patches traced to an open external joint
- Brick movement joints where the sealant has split
Your questions about external mastic in Sevenoaks Weald
Can you help a landlord with a rental near Hildenborough station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we will send you a clear quote.
Will you come out to Sevenoaks Weald?
Yes, Sevenoaks Weald is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Is it messy?
We keep the work tidy. Nearby surfaces are protected, and we clear up when we’re done.
What’s an expansion joint in brickwork?
Most straight vertical gaps in brickwork are movement joints. It gives the wall room to move.
What should I tell you?
Tell us what needs doing and where, with photos by email if possible. We will ask anything else we need to know.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. Working times can be discussed when we quote.
Do I have to be there?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
How do you reach high-level joints?
It depends on the building. Send us pictures and a rough idea of the height, and we’ll confirm what access is needed.
External mastic for homes and businesses in Sevenoaks Weald
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, and when it fails, the wall takes the strain and water finds a way in. We work on concrete & block, render & cladding joints and copings & trims, and the jobs we see most are rain getting behind render or cladding at a joint and rigid filler in a joint that should flex.
Around Sevenoaks Weald, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water generally gets in, and they need the right sealant at the right depth.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- Sevenoaks Weald (TN14)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Towns and villages near Sevenoaks Weald
What else we do in Sevenoaks Weald
Should I try it myself first?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What happens if it’s left?
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way and it means sorting access once. Where a wall is exposed, as many are in small places like Sevenoaks Weald, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Doing several joints on one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll send you a clear quote for the lot.
Why Sevenoaks Weald clients choose us
- Anti-fungal silicone where joints get wet
- We leave the area clean and tidy
- We never seal over old sealant
- Every job guaranteed for a year
See what affects the cost or our reviews.
How we quote for external mastic
There’s no set price list, because no two jobs are the same. What we look at:
- Any working-time requirements on site
- Whether old sealant or filler has to be cut out
- How many rooms, windows or areas are involved
- The size of the job
The cost depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before we start.
What we need to know
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- If someone has resealed it before
- Whether it’s a home or a business
- A few pictures by email, if you can
- Access, such as stairs, a lift or height
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.
Different surfaces, different methods
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
Aftercare tips
Aftercare is simple:
- Leave the joints unpainted unless we’ve said otherwise
- Wash walls gently around the sealant
- Never let anyone fill a movement joint with mortar
- Do not let climbing plants root in the sealant
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established, so it’s worth resealing at the first signs.
How the visit works
Before we leave, we go over the finished joints with you. The visit itself generally takes a few hours for a handful of joints, longer for a whole elevation, depending on how much there is to do. Somewhere like Sevenoaks Weald needs a little journey planning: 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 checking each joint, agreeing the ones to redo and how we will reach them.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Tell us about any water getting in
- Tell us if parking is tricky
- Try not to wet indoor joints just before the visit
Ask for a quote
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or email us.
Related advice
What we’re called out for in Sevenoaks Weald
Sometimes a movement joint was filled with mortar or a rigid filler, often by someone who didn’t know what it was for. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
It’s worth asking for a quote if you see:
- Plants rooting in failed movement joints
- Joints pointed up with cement by mistake
- Sealant pulling away from one side of the joint
- Cracked joints where brick meets render or frames
If you look after a building such as Weald Community Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What to look for in a quote
- What the quote includes, VAT included or not
- How long the guarantee is
- Who does the work, and how experienced they are
- Are they insured?
Sevenoaks Weald buildings and the weather
With historic houses such as Knole House (about 2.1 miles north) nearby, there’s older building stock in the area around Sevenoaks Weald as well as newer homes. In older buildings, 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, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Hildenborough station, outside joints that have cracked can let damp into a rental, so check them between lets. For an older house near a landmark such as Church of St George, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Sevenoaks Weald is about 3 miles south of Sevenoaks, in Kent. We provide external mastic to householders, landlords and businesses in Sevenoaks Weald, as part of our work across Kent. 922 places in Kent are on our list, large and small. You can also see our page for Crawley, roughly 19 miles from Sevenoaks Weald.
We cover every part of the TN14 postcode area for external mastic. Local streets include Church Road, Knole Close and Windmill Road, all of which we cover. Nearby, we also carry out external mastic in Hall's Green (1 mile south), Woodhatch (1 mile south-east), Goathurst Common (2 miles north-west), Kippington (2 miles north) and Charcott (2 miles south). Within a short drive, we also cover Maidstone (15 miles east), Dartford (14 miles north), Sevenoaks (3 miles north), Royal Tunbridge Wells (8 miles south-east), Tonbridge (5 miles south-east) and Northfleet (15 miles north-east).
Local landmarks in Sevenoaks Weald
Typical jobs here are in homes near Knole Park, among other places. The closest station to Sevenoaks Weald is Hildenborough station, about 2.3 miles south-east. Other landmarks nearby include Sevenoaks Hospital (3.6 miles north) and Chiddingstone Castle (4.1 miles south-west). Not far away are Barden Lake and Dryhill Nature Reserve.