Greater London · England
East Sheen External Mastic
External mastic in East Sheen from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Moss and dirt in joints with no sealant left
- Sealant pulling away from one side of the joint
- Rain getting behind render or cladding at a joint
How the job changes by surface
Render joints
The face of render can be soft, so a sealant that stretches easily protects the edges. We prime where the product needs it.
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap and keep the sealant to the right depth.
External mastic in East Sheen, done properly
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We strip the joint back and start again. If you have weathered mastic that no longer stretches and moss and dirt in joints with no sealant left, we can put it right.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. For a home in East Sheen, tell us how high the joints are and how to reach the back of the building.
A one-year guarantee comes as standard.
- Place
- East Sheen (SW14, SW13, SW15)
- Wider area
- Greater London
- Cover
- One year on every job
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Common questions in East Sheen
Can parking be tricky for a visit in East Sheen?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
I let a flat near Mortlake station. Can you help?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we’ll send you a clear quote.
Can you reach joints on upper floors?
It depends on the height and the site. Low-level joints are straightforward; for higher ones, send details and we’ll confirm the access.
How long does external mastic take?
Typically it takes a few hours for a handful of joints, longer for a whole elevation. Bigger jobs take longer, and we will say how long yours will take.
Are you fully insured?
Yes. We’re fully insured.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
Where are you based?
We work from Crawley. We cover East Sheen and the rest of Greater London.
Is it OK to fill a movement joint with cement?
No. Cement or mortar can’t stretch, so the joint stops doing its job. Where a joint has been mortared, it can often be raked out and sealed properly.
For landlords and businesses
We work for landlords and agents as well as householders. Resealing between tenancies keeps a property looking cared for.
For anyone letting property in or around East Sheen, several properties can go on one quote. Send us the addresses and the work at each.
What external mastic looks like in East Sheen
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Chiswick House (about 1.3 miles north) are a reminder that the area around East Sheen 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.
East Sheen is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. If you let a flat or house near Mortlake station, outside joints that have cracked can let damp into a rental, so check them between lets.
East Sheen is about 3 miles west of Fulham, in Greater London. Whether you are in the middle of East Sheen or further out, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. We cover 764 towns and villages across Greater London. There’s also a page for London, about 8 miles away.
We work across the SW14, SW13 and SW15 postcode area for external mastic. We cover properties on Elm Road, Well Lane and Fife Road and the roads around them. We also cover Mortlake (1 mile north-east), North Sheen (1 mile north-west), Barnes (1 mile north-east), Grove Park (1 mile north) and Richmond upon Thames (1 mile west). Further out, we also cover London (8 miles east), City of Westminster (6 miles north-east), Marylebone (6 miles north-east), Kensington (4 miles north-east), St Pancras (8 miles north-east) and Shoreditch (9 miles north-east).
Near you in East Sheen
We work in homes and buildings around Hare and Hounds pub, Palewell Park and Ibstock Place School. East Sheen has its own railway station: Mortlake station. Nearby you will also find Ubuntu Museum: African Museum of Humanity (1.1 miles south-east) and Barnes Hospital (0.5 miles east). The countryside around East Sheen includes Duke's Hollow and Kew Gardens Lake.
What we do, step by step
Before we leave, we go over the finished joints with you. The work normally takes anything from a few hours to several days, depending on the building, depending on how much there is to do. In East Sheen, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Tell us if parking is tricky
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about earlier repairs to the joints
Get a quote
We quote each job on its own, so the first step is telling us about yours. Simply phone 0345 464 0079 or email us and describe the job and send photos if you have them.
Advice
Common problems we fix in East Sheen
UV, rain and frost all age exterior sealant. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
Keep an eye out for any of the following:
- Plants rooting in failed movement joints
- Water getting into walls through failed joints
- Brick movement joints where the sealant has split
- Failed seals between different materials
In the older streets around All Saints' Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Before booking anyone
- What insurance they hold
- Whether all the old sealant comes out first
- How long the guarantee is
- What happens if they find a problem under the old sealant
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
When it is not the sealant
In fairness, there are a few things sealant won’t fix:
- Structural movement, which needs a surveyor or engineer
- Damp that isn’t coming from the joint
- Cracking across the wall rather than at a joint
If you are not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer.
Where we work in East Sheen
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Façade panels
- Render & cladding joints
- Brickwork movement joints
Nearby places to East Sheen
More services for East Sheen
Quotes for external mastic in East Sheen
There’s no set price list. The quote depends on:
- The type of sealant required
- The size of the job
- Mould in or behind the old joints
- How many rooms, windows or areas are involved
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Any previous sealing or DIY work
- Any access issues, like height or stairs
- How many joints, rooms or windows are involved
- What’s wrong with the joints now
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or drop us an email.