Greater London · England
External & façade joints in Wallington, Greater London
We cover Wallington 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.
- Weeds or debris growing in open joints
- Weathered mastic that no longer stretches
- Joints pointed up with cement by mistake
Your questions about external mastic in Wallington
Do you cover Wallington for external mastic?
Yes, Wallington is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Can parking be tricky for a visit in Wallington?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Can you quote for more than one area?
Yes. Just list everything you need and you will get one quote.
Should I point up the gap in my brickwork?
No. Mortar locks the joint solid, so the movement cracks the wall elsewhere. Use a flexible sealant with backing rod.
Why do you put foam in the joint first?
We fit closed-cell backing rod wherever the joint depth needs controlling. It controls the depth and stops the sealant bonding to the back so the bead can stretch.
Will it make a mess?
We keep the work tidy. Nearby surfaces are protected, and the area is left clean when we finish.
Are you insured?
Yes. We are fully insured.
What’s an expansion joint in brickwork?
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.
External mastic in Wallington, done properly
Low-level joints can generally be done from the ground. Where joints are higher up, tell us about the building when you get in touch and we’ll confirm what’s needed to reach them safely. If you are dealing with sealant pulling away from one side of the joint and cracked joints where brick meets render or frames, we can help.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so one failed joint can cause damp for more than one household. For a flat in Wallington, check the lease for who looks after the outside.
There’s a 12-month guarantee on every job, large or small.
- Where
- Wallington (SM6, SM5)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Quotes for external mastic in Wallington
Jobs vary more than people expect. What affects the quote:
- How easy the joints are to reach
- The number of rooms or windows
- Any working-time requirements on site
- The type of sealant required
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, and we’ll explain the quote if you ask.
What we need to know
What to tell us when you ask for a quote:
- Roughly how big the job is
- Where the property is
- Photos by email, if that’s easy
- What’s wrong with the joints now
We do not publish a price list. Instead, we send you a clear quote for your job. To arrange one, call 0345 464 0079 or email us.
Towns and villages near Wallington
Other services in Wallington
Wallington buildings and the weather
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts.
If you look after a building such as Holy Trinity CofE Junior School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For landlords with property near Wallington station, outside joints that have cracked can let damp into a rental, so check them between lets.
Wallington is about 2 miles west of Croydon, in Greater London. For external mastic in and around Wallington, please phone 0345 464 0079 or drop us an email for a quick quote. We’re based in Crawley and cover Greater London. Our Greater London coverage runs to 764 places, and Wallington is one of them. London is on our list too, about 10 miles from Wallington.
All of SM6 and SM5 is covered for external mastic, from the main roads to the quietest streets. Local streets include Wallington Square, London Road and Maldon Road, and we cover them all. You will find Wallington on the A237 and B271, so it’s easy for us to get to. We also cover the places around Wallington: Bandonhill (1 mile east), Carshalton (1 mile west), Beddington (1 mile north-east), The Wrythe (1 mile north-west) and Roundshaw (1 mile south-east). Within a short drive, we also cover London (10 miles north), City of Westminster (10 miles north), Marylebone (11 miles north), Kensington (10 miles north), St Pancras (11 miles north) and Shoreditch (12 miles north).
Near you in Wallington
In Wallington, that means homes and buildings near Carshalton Park, Dukes Head Public House and Wallington County Grammar School and the streets around them. There’s a railway station in Wallington itself: Wallington station. Well-known places in the area include Honeywood Museum (0.6 miles west) and Centrale Croydon (2.2 miles east). Not far away are Sutton Ecology Centre Grounds and Duppas Hill.
Can I do it myself?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
When something else is needed
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Failed render or damaged cladding panels
- Cracking across the wall rather than at a joint
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
What we seal
- Copings & trims
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
Leave it or put it right?
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and doesn’t last so it’s worth doing right. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What you get with us
- A choice of colours where the product allows
- We are fully insured
- A sealant colour to suit the surroundings
- Old sealant always removed completely
Take a look at what affects the cost and customer reviews.
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll quote.
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
What we are called out for in Wallington
Sometimes a movement joint was filled with mortar or a rigid filler. The joint cannot move, so the wall cracks somewhere else instead.
These are the problems we’re asked about most:
- Panel joints letting water in
- Hard, crazed mastic that has stopped moving
- Brick movement joints where the sealant has split
- Joints pointed up with cement by mistake
If you live in an older home near Church of the Holy Trinity, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Questions to ask before booking
- What the cure time is
- Which colour the sealant will be
- Which sealant they’ll use, and why
- How the surfaces are prepared before sealing
How it works
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes anything from a few hours to several days, depending on the building, and the area is left clean. For a job in Wallington, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- 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
- Keep children and pets away from the work area
- Mention any tricky access
- Tell us about any previous sealing or DIY attempts
Get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.