Greater London · England
External Mastic in Berrylands
Sealing brickwork movement joints, render, cladding and façade joints for Berrylands, backed by a 12-month guarantee. Call for a quick quote.
- Failed seals between different materials
- Sealant pulling away from one side of the joint
- Weeds or debris growing in open joints
How we handle external mastic in Berrylands
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement where mortar or filler would crack. We work on copings & trims, render & cladding joints and concrete & block, and common reasons people get in touch are weathered mastic that no longer stretches and gaps where render, brick and frames meet.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so a leaking gutter joint or failed wall joint can affect more than one home. For a flat in Berrylands, check the lease for who looks after the outside.
All of our work is guaranteed for twelve months.
- Where
- Berrylands (KT5, KT3, KT6)
- Region
- Greater London
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
To keep the joints looking good and working properly:
- Avoid pressure-washing directly into sealant joints
- Keep movement joints as flexible joints, not mortar
- Leave the joints unpainted unless we have said otherwise
- Tell anyone working on the walls about the movement joints
Only paint over the joint if we’ve confirmed the sealant can take paint. Paint can crack on a flexible joint and spoil the finish.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
For landlords and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
We work for landlords and letting agents as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
How it works
Every visit runs the same way: we check the joints, protect the area around them, carry out the job and clear up. Most jobs take a few hours for a handful of joints, longer for a whole elevation. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Berrylands. A visitor permit or a nearby bay makes the visit run more smoothly.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Let us know about earlier repairs to the joints
- Let us know about stairs, lifts or work at height
Getting a quote
Need a quote? Please phone 0345 464 0079 or send us an email and tell us about the job. We’ll explain what we’d do and send you a clear quote before any work starts.
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Honest limits
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Walls that need new movement joints cut into them
- Cracked brickwork or render that needs a builder or plasterer
- Rising or penetrating damp from elsewhere in the wall
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly.
Where we work in Berrylands
- Copings & trims
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
Berrylands questions
Can parking be tricky for a visit in Berrylands?
Parking in Berrylands, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Do you work for landlords with property near Berrylands station?
Yes. We work for landlords and letting agents as well as homeowners. Just call 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
Do you work at height?
It depends on the building. We work on joints that can be reached safely. Give us some details and we’ll confirm the access.
Where are you based?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Do you seal joints where cladding meets other materials?
Yes. Different materials move at different rates, so the joint between them must be flexible. We choose one that suits both surfaces.
Can a movement joint be filled with mortar?
No. Cement or mortar can’t stretch, so the joint stops doing its job. If it has already been filled, we can generally cut it out and reseal it.
Do you work in Berrylands?
Yes. We work in Berrylands and the rest of Greater London. To book, phone 0345 464 0079 or drop us an email.
Can I do it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Also near Berrylands
Also in Berrylands
Different surfaces, different methods
Render joints
Cracks along render joints let water in behind the coat. A sound joint keeps the render dry behind and protects the render itself.
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. We reseal them with an exterior sealant suited to the material.
Do you need external mastic in Berrylands?
A lot of failed joints come down to preparation: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
Any of these means the joints need attention:
- Joints pointed up with cement by mistake
- Weathered mastic that no longer stretches
- Brick movement joints where the sealant has split
- Damp patches traced to an open external joint
Letting a property close to Berrylands station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Before you book anyone
- What guarantee comes with the work
- Whether you can choose the colour
- Whether they’re fully insured
- Is VAT in the price?
Outside joints around Berrylands
With historic houses such as Hampton Court Palace (about 2.4 miles west) nearby, there’s older building stock in the area around Berrylands 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.
Berrylands is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Managing a site like Christ Church CofE Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Berrylands is about 1 mile east of Surbiton, in Greater London. For external mastic in and around Berrylands, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We are based in Crawley and cover Greater London. Berrylands is one of 764 towns and villages in Greater London we cover. For nearby work, see our London page, about 11 miles away.
Our applicators cover all of the KT5, KT3 and KT6 postcode area for external mastic. If you need external mastic at a property on Park Road, The Avenue and Regent Road or anywhere close by, we can help. Other places close to Berrylands include Tolworth (1 mile south), Surbiton (1 mile west), Old Malden (1 mile south-east), Worcester Park (2 miles south-east) and Chessington (2 miles south). Within a short drive, we also cover London (11 miles north-east), City of Westminster (10 miles north-east), Marylebone (10 miles north-east), Kensington (8 miles north-east), St Pancras (12 miles north-east) and Shoreditch (13 miles north-east).
What’s near Berrylands
In Berrylands, that means homes and buildings near Beverley Park, Coronation Hall pub and Kingston School of Art. Berrylands has its own railway station: Berrylands station. Other landmarks nearby include Tolworth Hospital (1.1 miles south) and Bentall Centre (1.5 miles north-west). Green spaces nearby include Kingston Hill Road area and The Lake.
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.