Surrey · England
External & façade joints in Chelsham, Surrey
Specialist external mastic for Chelsham: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Failed sealant between panels on a façade
- Sealant that has lost its bond to the brick or render
- Movement joints filled with mortar instead of sealant
For landlords and businesses
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
How we handle external mastic in Chelsham
For buildings in Chelsham, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean joint faces and the right depth. If you have weathered mastic that no longer stretches and joints pointed up with cement by mistake, we can help, whatever the surface.
External sealant needs dry, clean surfaces, so work around Chelsham is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
All of our work is guaranteed for twelve months, in Chelsham and everywhere else we cover.
- Location
- Chelsham (CR6)
- Wider area
- Surrey
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly.
Also near Chelsham
Also in Chelsham
Aftercare tips
Good habits help new joints last longer. Our tips:
- Check the sealant is paintable before painting near it
- Walk round the building once a year and look at the joints
- Have failed joints looked at early
- Clear growth from the base of walls and joints
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
How we quote for external mastic
The price is agreed before any work begins. It’s based on:
- Access and height
- Whether there’s mould to deal with
- The number of rooms or windows
- Whether old sealant or filler has to be cut out
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we’ll go through it with you.
What we need to know
Before you ask for a quote, have a think about:
- Where the job is, and your postcode
- How we’d reach the joints
- A few photos by email, if you can
- Roughly how big the job is
Every job is quoted individually, so the first step is telling us about yours. Simply ring 0345 464 0079 or email us and describe the job.
Chelsham: your questions answered
Do you cover smaller places like Chelsham?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you do external mastic in Chelsham?
Yes, Chelsham 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.
Do you take out the old sealant first?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
What’s an expansion joint in brickwork?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It’s sealed with a flexible sealant, not mortar.
What colours does the sealant come in?
We aim for a joint that suits the wall rather than one that jumps out. Colour is agreed with you before we begin from the range available.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Do you guarantee your work?
Yes. Each job is guaranteed for twelve months, wherever you are.
How long before the joint can be used?
Cure times vary by product. Before we leave, we’ll tell you the cure time.
Surface by surface
Joints between dissimilar materials
Each side of the joint may need its own preparation. We prepare both faces so the sealant bonds properly.
Render joints
Render is weaker at the surface than brick, so a low-modulus sealant is kinder to the joint edges. Priming is done where the sealant calls for it.
What external mastic looks like in Chelsham
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. Historic houses like Addington Palace (about 3 miles north) are a reminder that the area around Chelsham has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
If you let a flat or house near Woldingham station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. If you look after a building such as Warlingham Village Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. If you live in an older home near Church of St Mary the Virgin, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Chelsham is about 3 miles north-east of Caterham, in Surrey. Anywhere in CR6, we can carry out external mastic at your property. Across Surrey, we cover 395 places, and Chelsham is one of them. For nearby work, see our London page, about 13 miles away.
Our applicators cover all of the CR6 postcode area for external mastic. We cover properties on Chelsham Common and Chelsham Road. Neighbouring places we cover for external mastic include Farleigh (1 mile north), Warlingham (1 mile west), Hamsey Green (1 mile west), Fickleshole (1 mile north-east) and New Addington (2 miles north). Within a short drive, we also cover Epsom (10 miles west), Horley (11 miles south-west), Redhill (8 miles south-west), Ewell (10 miles west), Reigate (9 miles south-west) and Caterham (3 miles south-west).
Around Chelsham
In Chelsham, that means homes and buildings near Warlingham School, Ledgers Wood and Hare & Hounds pub, among other places. The nearest railway station is Woldingham station, about 1.9 miles south-west of the centre. Well-known places in the area include Warlingham Park Hospital (less than half a mile north) and East Surrey Museum (3 miles south-west). The countryside around Chelsham includes Hutchinson's Bank and Nore Hill.
How it works
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. Most jobs take anything from a few hours to several days, depending on the building. For a village or hamlet like Chelsham, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- 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.
How to prepare
- Let us know about parking restrictions
- Let us know about earlier repairs to the joints
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Advice
When something else is needed
Sealant is not the answer to every problem, and we’d rather say so up front. It won’t solve:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Subsidence or other structural problems
- Render that is blown, hollow or coming away
If you’re not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer.
What we seal
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
- Concrete & block
- Façade panels
- Joints between brick and frames