Greater London · England
External & façade joints in South Wimbledon, Greater London
Specialist external mastic for South Wimbledon: careful preparation, the right product and tidy work. Call for a quick quote.
- Brick movement joints where the sealant has split
- Plants rooting in failed movement joints
- Joints where the bead has come unstuck
External mastic in South Wimbledon
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing and we use one wherever it does. If you have moss and dirt in joints with no sealant left and cracked joints where brick meets render or frames, we can help, on joints between brick and frames, concrete & block and brickwork movement joints alike.
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. In a converted house in South Wimbledon, it’s worth checking who is responsible for the outside before booking.
You’re covered for a year from the day we finish. If anything is not right with it, ring 0345 464 0079 or drop us an email.
- Location
- South Wimbledon (SW19, SW20, SW17)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
For landlords and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
How it works
There isn’t much for you to do on the day. Point us to the joints and we will get on with it. The work itself takes anything from a few hours to several days, depending on the building from start to finish. For a job in South Wimbledon, parking and access are the things to plan: let us know about parking, the floor we’ll 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.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Tell us if parking is tricky
- Mention if the joints have been sealed before
- Keep children and pets away from the work area
Ask for a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved before giving you a price.
Advice
Common problems we fix in South Wimbledon
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it can’t stretch and tears as soon as the joint widens.
Any of these means the joints need attention:
- Movement joints filled with mortar instead of sealant
- Brick movement joints where the sealant has split
- Failed sealant between panels on a façade
- Damp patches traced to an open external joint
Letting a property close to Wimbledon station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
What your quote should include
- What guarantee comes with the work
- Is VAT in the price?
- What insurance they hold
- Whether they seal over old material or remove it
South Wimbledon: your questions answered
Is parking an issue for external mastic in South Wimbledon?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
I let a flat near Wimbledon station. Can you help?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Where do you work from?
Mr Mastic is based in Crawley. We cover South Wimbledon and the rest of Greater London.
Is it OK to fill a movement joint with cement?
No, not where the gap is a movement joint. Filling it with mortar defeats its purpose, and the wall may crack nearby. We will reseal it with a flexible sealant.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit.
Do you cover South Wimbledon?
Yes. We’re based in Crawley and work across South East England, London and Scotland, South Wimbledon included.
Is it OK to seal over old sealant?
No. The old sealant always comes out first, so the new joint bonds to clean surfaces.
Why it’s worth doing now in South Wimbledon
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render, so the damage spreads beyond the joint. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in South Wimbledon, the repair is bigger than the sealant job would have been.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we will explain the quote if you ask.
Why choose Mr Mastic in South Wimbledon
- 20+ years of sealant experience
- 180+ five-star Google reviews
- Arbo and Everbuild products
- We leave the area clean and tidy
Take a look at what affects the cost or customer reviews.
When something else is needed
Sealant is not the answer to every problem, and we’ll tell you before work begins. It won’t solve:
- Subsidence or other structural problems
- Loose or hollow render, which needs re-rendering
- Rising or penetrating damp from elsewhere in the wall
If you’re not sure, just phone 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
Where we work in South Wimbledon
- Façade panels
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Render & cladding joints
- Concrete & block
How to look after the new joints
Simple care keeps the joints in good condition. We recommend:
- Keep high-pressure jets off the joints
- Ask before painting over external sealant
- Show decorators and builders where the movement joints are
- Have failed joints looked at early
Only paint over the joint if we have confirmed the sealant can take paint. Many exterior sealants aren’t designed to be painted.
Small splits are the time to act. At that stage it’s a simple cut out and reseal before water has had years to get in.
What affects the quote in South Wimbledon
The price is agreed before any work begins. It’s based on:
- The old material and how stubborn it is
- Access and height
- The number of rooms or windows
- The product the joint needs
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first and agree the price before starting.
What we need to know
To make quoting easier, please include:
- What’s wrong with the joints now
- Where the property is
- Pictures of the joints, sent by email
- Whether it’s a home or a business
For external mastic in South Wimbledon, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you will get a clear quote before we start.
External mastic in South Wimbledon: local notes
Historic houses like Southside House (about 1.6 miles west) are a reminder that the area around South Wimbledon 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. In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking.
As a London address, South Wimbledon can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Schools such as Holy Trinity CofE Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
South Wimbledon is about 1 mile south-east of Wimbledon, in Greater London. Jobs in South Wimbledon get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. 764 places in Greater London are on our list, large and small. London is on our list too, about 7 miles from South Wimbledon.
Every address in SW19, SW20 and SW17 is covered for external mastic, from the main roads to the quietest streets. Local streets include Gap Road, Mina Road and York Road, and we cover them all. We also cover the places around South Wimbledon: Merton (1 mile south-east), Merton Abbey (1 mile south-east), Summerstown (1 mile north-east), Colliers Wood (1 mile east) and Tooting Bec (1 mile north-east). Larger places within reach include London (7 miles north-east), City of Westminster (7 miles north), Marylebone (7 miles north), Kensington (6 miles north), St Pancras (8 miles north-east) and Shoreditch (9 miles north-east).
Local landmarks in South Wimbledon
In South Wimbledon, that means homes and buildings near Wimbledon High School, Wibbas Down Inn and Willington School, among other places. South Wimbledon has its own railway station: Wimbledon station. A little further out are Southside Wandsworth (2.4 miles north) and Wimbledon Museum (0.9 miles west). The countryside around South Wimbledon includes Battersea Park Lake and Merton Park Green Walks.