Kent · England
Stone Street External Mastic
Our applicators work in Stone Street on sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Movement joints with cracked, split or missing sealant
- Sealant that has lost its bond to the brick or render
- Old sealant gone brittle and cracked
External mastic in Stone Street, done properly
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, and when it fails, the wall takes the strain and water finds a way in. If you’re dealing with sealant that has lost its bond to the brick or render and old sealant gone brittle and cracked, we can put it right, on façade panels, copings & trims and brickwork movement joints alike.
Outside joints can only be sealed when they’re dry, so work in Stone Street is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
Every job is covered by a one-year guarantee, wherever you are in Kent.
- Where
- Stone Street (TN15)
- Region
- Kent
- Cover
- One year on every job
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Common problems we fix in Stone Street
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
Most people get in touch when they notice something like this:
- Moss and dirt in joints with no sealant left
- Joints where the bead has come unstuck
- Joints with sealant missing in places
- Hard, crazed mastic that has stopped moving
If you live in an older home near St Lawrence, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Questions to ask before booking
- Who turns up on the day
- Whether VAT is included
- Which sealant they’ll use, and why
- Whether they’re fully insured
Walls and rooflines in Stone Street
With historic houses such as Ightham Mote (about 1.1 miles south-east) nearby, there’s older building stock in the area around Stone Street as well as newer homes. 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, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Managing a site like St Lawrence Church of England Primary School? Then its movement joints, gutters and trims need looking after like any other building’s. For landlords with property near Kemsing station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Stone Street is about 3 miles east of Sevenoaks, in Kent. From the centre of Stone Street to the outskirts, we cover external mastic for every kind of property. Stone Street is one of 922 places in Kent we cover. You can also see our page for London, about 22 miles away.
Every address in TN15 is within our area for external mastic. If you need external mastic at a property on Church Road, Stone Street Road and Pond Lane or anywhere close by, our applicators can take on the job. Close by, we work in Bitchet Green (1 mile south-west), Ivy Hatch (1 mile east), Styants Bottom (1 mile north), Godden Green (1 mile west) and Ightham (1 mile north-east). Within a short drive, we also cover Maidstone (12 miles east), Dartford (12 miles north), Sevenoaks (3 miles west), Royal Tunbridge Wells (9 miles south), Gravesend (12 miles north-east) and Tonbridge (5 miles south).
Near you in Stone Street
Locally, jobs take us to homes and businesses close to Sevenoaks Preparatory School, Ivy Hatch Nature Reserve and The Plough pub. The nearest railway station is Kemsing station, about 1.9 miles north of the centre. Well-known places in the area include Ightham Court (2.2 miles north-east) and Sevenoaks Hospital (2.8 miles north-west). Open spaces near Stone Street include Dryhill Nature Reserve.
DIY sealant or a professional job?
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.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly.
FAQs for Stone Street
Is Stone Street within the area you cover?
Yes, Stone Street is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you do external mastic in Stone Street?
Yes. We work across London and the South East, and Stone Street is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job.
Do you work for landlords and businesses?
Yes. We work in homes, commercial premises and hotels, and we’re fully insured.
Do you work at height?
Each building is different. Send us pictures and a rough idea of the height, and we’ll confirm what access is needed.
Will you leave a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
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.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done and you will get one quote.
How much does external mastic cost in Stone Street?
Size, access and the old material all affect the cost. Call for a quick quote and we’ll talk you through it.
Towns and villages near Stone Street
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Quotes for external mastic in Stone Street
Call for a quick quote. What matters most is:
- How many rooms, windows or areas are involved
- The size of the job
- How much old sealant there is and how hard it is to remove
- Working hours on commercial sites
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
What we need to know
To make quoting easier, let us know:
- Where the job is, and your postcode
- The rough size of the job
- The type of property
- What the problem is, such as mould, gaps, leaks or cracking
We don’t publish a price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To get started, phone 0345 464 0079 or drop us an email.
For landlords and businesses
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we are fully insured.
How to look after the new joints
To keep the joints looking good and working properly:
- Ask before painting over external sealant
- Tell anyone working on the walls about the movement joints
- Deal with leaking gutters that soak the joints below
- Check external joints each spring
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They must stay as flexible joints, never rendered or pointed over.
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 it works
Before we leave, we go over the finished joints with you. The work normally takes a few hours for a handful of joints, longer for a whole elevation, depending on the size of the job. Somewhere as small as Stone Street, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Mention if the joints have been sealed before
- Mention any sign-in or site rules at work premises
Ask for a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
Read more
Leave it or put it right?
Sealing over the top of old mastic doesn’t hold for long. The new layer can’t bond properly to old, weathered material, so we always take the old sealant out. In a small place like Stone Street, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you’re not sure whether it needs doing, phone 0345 464 0079 or send us an email and we will give you an honest view and a quote.
Why book with us
- Trusted Arbo and Everbuild sealants
- 180+ five-star Google reviews
- A sealant colour to suit the surroundings
- More than 20 years in sealant work