Greater London · England
External Mastic in Summerstown
External mastic for Summerstown and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Gaps where render, brick and frames meet
- Water getting into walls through failed joints
- Plants rooting in failed movement joints
Common questions in Summerstown
Is Summerstown in your area for external mastic?
Yes, Summerstown 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, and we’ll send you a clear quote.
Can you help a landlord with a rental near Earlsfield station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear price.
Do I need to be at home?
That depends on where the joints are. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
What colours does the sealant come in?
We choose a sealant colour to suit the brick, stone or render. Exterior sealants come in a good range of colours.
Can I add another job to the visit?
Yes. More than one area can go on one quote.
What sealant do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Do the sealants smell?
Some sealants have a smell while they cure, which fades as it sets. Ventilation helps.
Can I do it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
External mastic in Summerstown
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we will confirm what access is needed. Typical jobs include water getting into walls through failed joints and failed sealant between panels on a façade, on concrete & block, brickwork movement joints and joints between brick and frames.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall, and both kinds of building are found across London.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Place
- Summerstown (SW17, SW18, SW19)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How we quote for external mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Which sealant suits the joint
- How much old sealant there is and how hard it is to remove
- Access and height
- How many rooms, windows or areas are involved
What you pay reflects the work, not guesswork. That is why we ask a few questions first and send you a clear quote before work begins.
Helping us quote
What to tell us when you ask for a quote:
- How many joints, rooms or windows are involved
- If it’s domestic, commercial or a hotel
- Where the property is
- A few pictures by email, if you can
Getting a quote is simple: let us know the job and the location. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.
What we can’t put right
It helps to know what we cannot do:
- Render that’s blown, hollow or coming away
- Subsidence or other structural problems
- Damp that isn’t coming from the joint
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think.
What we seal
- Joints between brick and frames
- Façade panels
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
- Concrete & block
Places near Summerstown
Other services in Summerstown
Summerstown buildings and the weather
In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking. Historic houses like Southside House (about 2.4 miles south-west) are a reminder that the area around Summerstown has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
As a London address, Summerstown can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. If you live in an older home near St Mary's Church, the joints between older walls, newer extensions and the roofline need a sealant that can move. If you look after a building such as Burntwood School, its movement joints, gutters and trims need looking after like any other building’s.
Summerstown is about 1 mile north-east of Wimbledon, in Greater London. Homes, rented property, offices and hotels in Summerstown can book us for external mastic, old or new, large or small. The work is guaranteed for a year. Our Greater London coverage runs to 764 places, and Summerstown is one of them. For nearby work, see our London page.
Every address in SW17, SW18 and SW19 is covered for external mastic, from the main roads to the quietest streets. Whether your property is on Weir Road, Acuba Road and Mount Road or anywhere close by, we can help. Main roads around Summerstown include the A218, so getting to you is simple. We also cover Earlsfield (1 mile north), Southfields (1 mile north), Tooting Bec (1 mile south-east), Tooting (1 mile south-east) and South Wimbledon (1 mile south-west). We also work in nearby towns such as London (6 miles north-east), City of Westminster (6 miles north), Marylebone (6 miles north), Kensington (5 miles north), St Pancras (7 miles north-east) and Shoreditch (8 miles north-east).
Local landmarks in Summerstown
Around Summerstown, our work takes us to homes and buildings near Hillcroft School, Leather Bottle pub and King George's Park and the streets around them. Summerstown’s nearest station is Earlsfield station, about 0.5 miles north of the centre. Nearby you will also find Southside Wandsworth (1.4 miles north) and St George's Hospital (0.7 miles south-east). Green spaces nearby include Wandle Meadow Nature Park and Battersea Park Lake.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
What happens if it’s left?
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together. 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 Summerstown, the repair is bigger than the sealant job would have been.
What it costs depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. We give a clear quote before any work starts.
Why Summerstown customers choose us
- We never seal over old sealant
- We leave the area clean and tidy
- More than 20 years in sealant work
- Experience in homes, commercial sites and hotels
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Look over the joints every year, ideally after winter
- Have failed joints looked at early
- Deal with leaking gutters that soak the joints below
- Keep high-pressure jets off the joints
Do not let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years, so it’s worth resealing at the first signs.
What the job involves on each surface
Concrete and blockwork
Concrete faces can be dusty and porous, so cleaning and priming matter. A primer goes on where the product requires one before the bead.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so its sealant has to stay flexible.
What we do, step by step
There is not much for you to do on the day. Show us the job and we will take it from there. The work itself takes anything from a few hours to several days, depending on the building from start to finish. In a London area like Summerstown, 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.
- We look at every joint and agree a colour to suit the wall.
- 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.
How to prepare
- Let us know about stairs, lifts or work at height
- Tell us about any previous sealing or DIY attempts
- Let us know about parking restrictions
How to get a quote
For a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. You will have a clear quote before work begins.