Surrey · England
Ewell External Mastic
Professional external mastic in and around Ewell, with old sealant always removed completely.
- Cracked joints where brick meets render or frames
- Panel joints letting water in
- Moss and dirt in joints with no sealant left
External mastic in Ewell, done properly
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement where mortar or filler would crack. We work on brickwork movement joints, joints between brick and frames and render & cladding joints, and the jobs we see most are joints pointed up with cement by mistake and joints where the bead has come unstuck.
In a town like Ewell, older houses with traditional gutters sit alongside newer estates with uPVC rooflines and rendered walls. All of those joints move, so they need a flexible sealant rather than a rigid filler.
A 12-month guarantee comes as standard, so you’re covered after we’ve gone.
- Location
- Ewell (KT19, KT17, SM2)
- Wider area
- Surrey
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Ewell: your questions answered
What guarantee comes with external mastic in Ewell?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Do you work for landlords with property near Ewell West station?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or send us an email and tell us about the property, and we’ll send you a clear quote.
How long will you be here?
It depends on the size of the job, but as a guide it takes a few hours for a handful of joints, longer for a whole elevation. We will give you a better idea when we quote.
How often do external joints need resealing?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year and reseal when it splits.
Where is Mr Mastic based?
We’re based in Crawley, and we work across South East England, London and Scotland.
Does someone need to be in?
That depends on where the joints are. For work indoors, someone needs to let us in.
Can you seal joints between render and window frames?
Yes. Joints between dissimilar materials are a big part of external work. The sealant is chosen to bond to both sides, primed where needed.
Will the new joint stand out?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Have failed joints looked at early
- Show decorators and builders where the movement joints are
- Clear growth from the base of walls and joints
- Walk round the building once a year and look at the joints
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
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.
What we can’t put right
Before booking, it’s worth knowing the limits:
- Structural movement, which needs a surveyor or engineer
- Cracks in the bricks or render themselves, away from the joints
- Render that is blown, hollow or coming away
If you’re not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer.
What we seal
- Joints between brick and frames
- Façade panels
- Copings & trims
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
How it works
The work is kept neat and contained to the area we are working on. The job generally takes anything from a few hours to several days, depending on the building. In Ewell, parking is rarely complicated, though it helps to know about driveways or restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Clear the area around the work
- Mention if the joints have been sealed before
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
For a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.
Related advice
Walls and rooflines in Ewell
With historic houses such as Fitznells Manor (about 0.2 miles south-east) nearby, there’s older building stock in the area around Ewell as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near Ewell West station, split movement joints are easy to miss on a rental until damp shows inside. If you live in an older home near St Mary's Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Ewell is about 10 miles south of Kensington, in Surrey. Jobs in Ewell get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Ewell is one of 395 places in Surrey where we work. London is on our list too, about 12 miles from Ewell.
Work in KT19, KT17 and SM2 is quoted and booked the same way as anywhere else. That includes homes and businesses on London Road, High Street and Church Road. Ewell sits on or near the A24 and A232. We also cover Stoneleigh (1 mile north-east), Cuddington (1 mile east), Epsom (1 mile south-west), Worcester Park (1 mile north) and North Looe (1 mile south-east). We also work in nearby towns such as Woking (14 miles west), Horley (13 miles south), Redhill (9 miles south-east), Egham (14 miles north-west), Reigate (8 miles south) and Walton-on-Thames (7 miles west). As one of the bigger places in Surrey, Ewell has every kind of property, from flats to offices.
Landmarks near Ewell
Typical jobs here are in homes near Blenheim High School, King William IV Public House and Hogsmill LNR. Ewell has its own railway station: Ewell West station. Nearby you’ll also find Chessington Castle Hill (1.6 miles west) and St. Ebba's Hospital (0.9 miles west). The countryside around Ewell includes Tolworth Court Farm Fields and The Lake.
Quotes for external mastic in Ewell
The quote reflects the job in front of us. We look at:
- Whether the work is at height
- Mould in or behind the old joints
- The size of the job
- Which sealant suits the joint
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What to tell us for a quote
What to tell us when you ask for a quote:
- The address or postcode of the job
- What’s wrong with the joints now
- A few pictures by email, if you can
- Access, such as stairs, a lift or height
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.
What we are called out for in Ewell
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall.
If you can see any of these, it’s time to have the joints looked at:
- Joints with sealant missing in places
- Rain getting behind render or cladding at a joint
- Plants rooting in failed movement joints
- Cracked joints where brick meets render or frames
If you look after a building such as St Clement's Catholic Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Questions to ask before you book
- Which sealant they’ll use, and why
- How long to leave it before use
- Whether you can choose the colour
- How the joint is cleaned and prepared
For landlords and businesses
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
More services for Ewell
Leave it or put it right?
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner, so it pays to do it properly once. Gaps in sealant and mould in the bead never get better on their own, and in a busy household in Ewell they spread with every shower and every downpour. Now is the easy time to put it right.
Combining jobs into one visit normally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We’ll give you a clear price for the lot.
Why choose Mr Mastic in Ewell
- Colour picked to suit the job
- Any old sealant cut out fully, not covered over
- We leave the area clean and tidy
- Anti-fungal silicone where joints get wet