Greater London · England
External & façade joints in Cheam, Greater London
We cover Cheam for 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.
- Plants rooting in failed movement joints
- Rain getting behind render or cladding at a joint
- Failed sealant between panels on a façade
External mastic in Cheam, done properly
Low-level joints can usually be done from the ground. Where joints are higher up, tell us about the building when you get in touch and we will confirm what’s needed to reach them safely. We are often asked to deal with water getting into walls through failed joints and failed seals between different materials, across render & cladding joints, concrete & block and brickwork movement joints.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall.
We stand behind the work with a 12-month guarantee, so you’re not left on your own once the job is done.
- Location
- Cheam (SM2, SM3, SM1)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Can I do it myself?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
What happens if it’s left?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. In a flat in Cheam, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Commercial jobs are quoted on the same basis as homes: 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.
Why Cheam customers choose us
- 180+ five-star Google reviews
- A 12-month guarantee on all work
- We leave the area clean and tidy
- Approved under the ARBOMaster scheme
Read how sealant jobs are priced or our reviews.
Signs you need external mastic in Cheam
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, so it pulls away from the edges.
Any of these means the joints need attention:
- Movement joints with cracked, split or missing sealant
- Rain getting behind render or cladding at a joint
- Rigid filler in a joint that should flex
- Gaps where render, brick and frames meet
As a London address, Cheam can be tricky for parking: let us know about parking bays, permits or a driveway.
Comparing quotes
- What happens if the job turns out different
- What insurance they hold
- Which sealant they’ll use, and why
- How the colour is chosen
The process
We bring everything the job needs with us, so you don’t need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. It normally takes a few hours to a few days, depending on the length of joint and the access. In Cheam, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Let us know if you’ve seen damp or leaks
- Let us know about earlier repairs to the joints
Ask for a quote
We don’t publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or drop us an email.
Related advice
What we cannot put right
To be straight with you, there are a few things sealant won’t fix:
- Damp that isn’t coming from the joint
- Adding movement joints to masonry that has none
- Failed render or damaged cladding panels
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before booking.
Surfaces we seal
- Render & cladding joints
- Façade panels
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
What affects the cost of external mastic
We quote each job individually. These are the things that affect it:
- The number and length of the joints
- How many rooms, windows or areas are involved
- Whether there’s mould to deal with
- Whether the work is at height
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
Helping us quote
You do not need to know the technical terms. It helps if you can tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- Access, such as stairs, a lift or height
- The address or postcode of the job
- Pictures of the joints, sent by email
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
Landlords, agents and businesses in Cheam
If you manage several properties in or around Cheam, several properties can be quoted together. Just tell us the addresses and what each one needs.
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Places near Cheam
Other services in Cheam
Cheam questions
Can you help a landlord with a rental near Cheam station?
Yes. We work for landlords and letting agents as well as householders, and several properties can be quoted together. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Is Cheam in your area for external mastic?
Yes, Cheam is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Do I have to be there?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
Can you work on commercial sites?
Yes. We can plan bigger jobs in stages to suit the site.
Do the sealants smell?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
What is a movement joint?
Brickwork, render and cladding all move a little, so long walls have planned gaps to take that movement. The gap is sealed with a flexible sealant over backing rod.
Do you work at height?
Each building is different. Tell us the height, the number of joints and what’s below them, and we will confirm what access is needed.
How long does external mastic take?
A typical job takes a few hours to a few days, depending on the length of joint and the access. Your quote will say how long we expect yours to take.
Outside joints around Cheam
Historic houses like Nonsuch Mansion (about 1 mile north-west) are a reminder that the area around Cheam 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. London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts.
Managing a site like Glaisdale School? Then larger buildings have long runs of movement joint that eventually need resealing. For landlords with property near Cheam station, split movement joints are easy to miss on a rental until damp shows inside.
Cheam is about 1 mile south-west of Sutton, in Greater London. We carry out external mastic for householders, landlords and businesses in Cheam and nearby. Cheam is one of 764 towns and villages in Greater London we cover. You can also see our page for London, about 12 miles away.
We cover every part of the SM2, SM3 and SM1 postcode area for external mastic. Whether your property is on Wray Road, York Road and The Avenue or a nearby road, our applicators can take on the job. If you are just outside Cheam, we cover Belmont (1 mile south-east), Cuddington (1 mile north-west), North Looe (1 mile south-west), North Cheam (2 miles north) and Nork (2 miles south). Within a short drive, we also cover London (12 miles north-east), City of Westminster (12 miles north), Marylebone (12 miles north), Kensington (11 miles north), St Pancras (13 miles north) and Shoreditch (14 miles north-east).
Near you in Cheam
Typical jobs here are in homes near Avenue Primary Academy, Howell Hill and Overton Grange School, among other places. For rail, the closest station is Cheam station, roughly 0.6 miles north of the centre. A little further out are The Ashley Centre (2.7 miles south-west) and Chessington Castle Hill (3.5 miles west). Not far away are Duppas Hill and Belmont Pastures.