Greater London · England
External Mastic in Coombe Hill
Sealing brickwork movement joints, render, cladding and façade joints in Coombe Hill, with a 12-month guarantee on every job. Ask us for a quote.
- Failed seals between different materials
- Plants rooting in failed movement joints
- Sealant pulling away from one side of the joint
Keeping the joints in good condition
Aftercare is simple:
- Leave the joints unpainted unless we have said otherwise
- Point out the joints to other trades
- Look over the joints every year, ideally after winter
- Keep movement joints as flexible joints, not mortar
Look over the joints once a year, ideally after winter. Watch for splits, edges coming away or growth in the joint.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established so early resealing is worth it.
How we handle external mastic in Coombe Hill
On houses, flats and commercial buildings across Coombe Hill, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean, sound faces and a controlled depth. If you have cracked joints where brick meets render or frames and moss and dirt in joints with no sealant left, we can help, whatever the surface.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so one failed joint can cause damp for more than one household. For a flat in Coombe Hill, check the lease for who looks after the outside.
Our work is backed for twelve months, in Coombe Hill and everywhere else we cover.
- Where
- Coombe Hill (SW15, KT2)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take a few hours to a few days, depending on the length of joint and the access. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Coombe Hill. It helps if you can point us to a visitor permit or a bay close to the door.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- Tell us about any water getting in
- Move anything stored near the joints
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
Want a quote for external mastic? Please call 0345 464 0079 or drop us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Related advice
Why deal with it now?
Pointing a movement joint with mortar might seem a neat fix, but it stops the joint moving. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. 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.
We do not show prices on the website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or send us an email.
Why us?
- Quality sealants from Arbo and Everbuild
- A choice of colours where the product allows
- Anti-fungal silicone where joints get wet
- 180+ five-star Google reviews
Read how sealant jobs are priced and customer reviews.
Outside joints around Coombe Hill
With historic houses such as Pembroke Lodge (about 1.5 miles north-west) nearby, there’s older building stock in the area around Coombe Hill as well as newer homes. Where a home is older, 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, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Coombe Hill is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Homes close to St John the Baptist include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep. Schools such as Robin Hood Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Coombe Hill is about 2 miles north-east of Kingston upon Thames, in Greater London. Across the SW15 area, we can carry out external mastic at your property. Coombe Hill is one of 764 towns and villages in Greater London where we work. Our London page covers work nearby.
Work in SW15 and KT2 works the same way as everywhere else we cover. If you need external mastic at a property on Keswick Avenue, Derwent Avenue and Robin Hood Lane or a nearby road, we can help. Main roads around Coombe Hill include the A308, which makes travel easy. Nearby, we also carry out external mastic in Kingston Vale (1 mile east), Putney Vale (1 mile east), Coombe (1 mile south), Norbiton (2 miles south-west) and Motspur Park (2 miles south-east). Further out, we also cover London (9 miles north-east), City of Westminster (7 miles north-east), Marylebone (8 miles north-east), Kensington (5 miles north-east), St Pancras (9 miles north-east) and Shoreditch (10 miles north-east).
Near you in Coombe Hill
Locally, jobs take us to homes and businesses close to Coombe Girls' School, Canbury School and Richmond Park. Coombe Hill’s nearest station is Norbiton station, about 1.6 miles south-west. Other landmarks nearby include Bentall Centre (2.2 miles south-west) and Kingston Hospital (1.4 miles south-west). Not far away are Kingston Hill Road area and Fishpond Wood and Beverley Meads.
DIY sealant or a professional job?
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.
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.
Also near Coombe Hill
More services for Coombe Hill
How we quote for external mastic
Every job gets its own quote. These are the things that affect it:
- The number of rooms or windows
- When we can work, for business premises
- Whether there’s mould to deal with
- Whether old sealant or filler has to be cut out
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You will know the price before we begin.
Asking for a quote
What to tell us when you ask for a quote:
- The type of property
- How we’d reach the joints
- Where the job is, and your postcode
- A few pictures by email, if you can
If you are in Coombe Hill and need external mastic, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Landlords, agents and businesses in Coombe Hill
We work for landlords and letting agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
For anyone letting property in or around Coombe Hill, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
Coombe Hill: your questions answered
Do you cover Coombe Hill for external mastic?
Yes, Coombe Hill is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
Is parking a problem for a job in Coombe Hill?
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.
Can you seal over the old sealant?
No, it won’t last. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
Can landlords and businesses book you?
Yes, often. Several properties can go on one quote.
Is there a guarantee?
Yes. Every job comes with a 12-month guarantee.
Can you do several jobs on one visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Can I do it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Do you take out the old sealant first?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Different surfaces, different methods
Render joints
Water behind render can lead to blown patches. Resealing the joints early keeps water out and protects the render itself.
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best.