Greater London · England
External Mastic in Long Ditton
We cover Long Ditton for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Panel joints letting water in
- Movement joints with cracked, split or missing sealant
- Damp patches traced to an open external joint
What happens on the day
We keep the work tidy and contained to the area we are working on, so you can get on with your day. Expect the work to take a few hours for a handful of joints, longer for a whole elevation. In Long Ditton, 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.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- Move anything stored near the joints
- Let us know about stairs, lifts or work at height
- Tell us about any previous sealing or DIY attempts
Getting a quote
There’s no standard price list. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or drop us an email.
Advice
External mastic in Long Ditton
A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. Typical jobs include moss and dirt in joints with no sealant left and movement joints filled with mortar instead of sealant, on concrete & block, copings & trims and façade panels.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. For a home in Long Ditton, tell us how high the joints are and how to reach the back of the building.
You get a one-year guarantee, the same in Long Ditton as everywhere else we work.
- Location
- Long Ditton (KT6)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Aftercare tips
Aftercare is simple:
- Get split or bare joints resealed while the damage is small
- Walk round the building once a year and look at the joints
- Show decorators and builders where the movement joints are
- Keep movement joints as flexible joints, not mortar
Don’t paint over the new sealant unless we have said the product is paintable. Paint can crack on a flexible joint.
Act while the splits are small. Then it’s a straightforward cut-out and reseal.
Different surfaces, different methods
Joints between dissimilar materials
Each side of the joint may need its own preparation. We prepare both faces so the sealant bonds properly.
Cladding and façade panels
If the façade has a specified sealant, that is what we use. Send us any details you have about the façade.
FAQs for Long Ditton
I let a flat near Surbiton station. Can you help?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
Can parking be tricky for a visit in Long Ditton?
Parking in Long Ditton, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Will there be a smell?
Some sealants have a smell while they cure. Ventilation helps.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
How long does external mastic last?
That depends on the wall, the weather and the movement. Look for splits, hardening or edges coming away and have them redone then.
How long should I leave it?
Different products cure at different speeds, so follow the cure time we give you.
Can you seal over the old sealant?
No. Fresh sealant doesn’t stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Do you work at height?
Each building is different. Send us photos and a rough idea of the height and we will confirm how they can be reached safely.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
What affects the cost of external mastic
You’ll get a clear quote before work begins. It’s based on:
- Whether old sealant or filler has to be cut out
- The type of sealant required
- The number of rooms or windows
- Any mould that needs treating
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Helping us quote
What to tell us when you ask for a quote:
- What’s wrong with the joints now
- Pictures of the joints, sent by email
- How many joints, rooms or windows are involved
- If it’s domestic, commercial or a hotel
We quote each job on its own, so the first step is telling us about yours. Just ring 0345 464 0079 or drop us an email with the details, and pictures are welcome.
Why it’s worth doing now in Long Ditton
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and doesn’t last, so it pays to do it properly once. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Why Long Ditton customers choose us
- Over 20 years’ experience
- Experience in homes, commercial sites and hotels
- We agree the colour with you first
- ARBOMaster approved applicator
Read what affects the cost or our reviews.
Landlord and commercial work in Long Ditton
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will quote.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
Also near Long Ditton
More services for Long Ditton
Walls and rooflines in Long Ditton
London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Schools such as Long Ditton Infant and Nursery School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. If you live in an older home near Church of St Mary, old and new materials meet at the roofline and walls, which is where sealant earns its keep. As a London address, Long Ditton can be tricky for parking: let us know about parking bays, permits or a driveway.
Long Ditton is about 1 mile south-west of Surbiton, in Greater London. Homes, rented property, offices and hotels in Long Ditton is covered for external mastic. Every job comes with our one-year guarantee. Long Ditton is one of 764 towns and villages in Greater London we cover. Our London page covers work nearby (12 miles or so).
Jobs for external mastic in KT6 is quoted and booked the same way as anywhere else. We cover properties on Pound Close, Fleece Road and St Chads Close. We also cover the places around Long Ditton: Ditton Hill (1 mile south), Seething Wells (1 mile north), Thames Ditton (1 mile west), Hinchley Wood (1 mile south-west) and Surbiton Park (1 mile north-east). Larger places within reach include London (12 miles north-east), City of Westminster (11 miles north-east), Marylebone (12 miles north-east), Kensington (9 miles north-east), St Pancras (13 miles north-east) and Shoreditch (14 miles north-east).
Landmarks near Long Ditton
We work in homes and buildings around Shrewsbury House School, Stokes Field and Raintree pub, among other places. For rail, the closest station is Surbiton station, roughly 0.7 miles north-east of the centre. A little further out are Tolworth Hospital (1.3 miles east) and Metropolitan Police Mounted Branch Museum (1.5 miles west). Open spaces near Long Ditton include The Lake and Kingston Hill Road area.