Greater London · England
External & façade joints in Southfields, Greater London
Problem with your movement joints in Southfields? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Weathered mastic that no longer stretches
- Brick movement joints where the sealant has split
- Sealant that has lost its bond to the brick or render
External mastic in Southfields, done properly
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we will confirm what’s needed to reach them safely. We work on concrete & block, brickwork movement joints and façade panels, and common reasons people get in touch are panel joints letting water in and old sealant gone brittle and cracked.
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, and both kinds of building are found across London.
Our work is backed for twelve months, in Southfields and everywhere else we cover.
- Place
- Southfields (SW18, SW19, SW17)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlords, agents and businesses in Southfields
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will quote.
Do you need external mastic in Southfields?
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. All of that ends up in the joint sealant.
Signs it’s time to call us include:
- Joints with sealant missing in places
- Weathered mastic that no longer stretches
- Joints where the bead has come unstuck
- Moss and dirt in joints with no sealant left
As a London address, Southfields can be tricky for parking: let us know about parking bays, permits or a driveway.
Before booking anyone
- Which colour the sealant will be
- What preparation is included
- What guarantee comes with the work
- How long to leave it before use
DIY versus a professional finish
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Why deal with it now?
Mortar or ordinary filler might look like a quick way to close an open joint, but it locks the joint solid. The movement then cracks the brickwork or render nearby. The correct repair is a flexible sealant with the right backing. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Southfields, the repair is bigger than a sealant job.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why us?
- A 12-month guarantee on all work
- Over 20 years’ experience
- Quality sealants from Arbo and Everbuild
- Full insurance on every job
See our cost guide and what customers say.
What happens on the day
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself generally takes anything from a few hours to several days, depending on the building, depending on the amount of work. In a London area like Southfields, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
How to prepare
- Mention if the joints have been sealed before
- For business premises, tell us about site rules or sign-in
- Clear the area around the work
How to get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved.
Read more
Your questions about external mastic in Southfields
Can you help a landlord with a rental near Earlsfield station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Can parking be tricky for a visit in Southfields?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Do the sealants smell?
Possibly a little. It fades as the sealant cures, and ventilation helps.
Can I do it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Where are you based?
We’re based in Crawley, West Sussex, and we work across South East England, London and Scotland.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme.
Do you cover Southfields?
Yes. From our base in Crawley, we cover South East England, London and all of Scotland.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before resealing.
Towns and villages near Southfields
Other services in Southfields
Southfields buildings and the weather
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking.
If you live in an older home near St John the Divine, the joints between older walls, newer extensions and the roofline need a sealant that can move. If you look after a building such as Floreat Wandsworth Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Southfields is about 2 miles north-east of Wimbledon, in Greater London. Homes, rented property, offices and hotels in Southfields is covered for external mastic. Every job comes with our one-year guarantee. Our area takes in 764 places across Greater London. For nearby work, see our London page, about 6 miles away.
Here we cover the SW18, SW19 and SW17 postcode area for external mastic. Streets in the area include Burr Road, Acuba Road and Mount Road. If you are just outside Southfields, we cover Earlsfield (1 mile south-east), Wandsworth (1 mile north), Summerstown (1 mile south), Battersea (2 miles north-east) and Clapham Junction (2 miles north-east). Within a short drive, we also cover London (6 miles north-east), City of Westminster (5 miles north), Marylebone (5 miles north), Kensington (4 miles north), St Pancras (6 miles north-east) and Shoreditch (7 miles north-east).
Landmarks near Southfields
In Southfields, that means homes and buildings near Old Sergeant pub, Southfields Academy and Wandsworth School and the streets around them. Southfields has its own railway station: Earlsfield station. Other landmarks nearby include Royal Hospital for Neuro-disability (1 mile west) and Wimbledon Lawn Tennis Museum (1.2 miles south-west). Green spaces nearby include Henman Hill and Wandle Meadow Nature Park.
How to look after the new joints
After the cure time, these simple habits help:
- Point out the joints to other trades
- Get split or bare joints resealed while the damage is small
- Walk round the building once a year and look at the joints
- Ask before painting over external sealant
Do not paint over the new sealant unless we have said the product is paintable. Paint can crack on a flexible joint.
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.
Different surfaces, different methods
Render joints
Render has movement joints and stop beads that need sealing. They’re resealed in a sealant that suits the render.
Joints between dissimilar materials
Wherever two materials meet, they move differently. We seal the joint with a flexible exterior sealant.