Greater London · England
External Mastic in South Kenton
Sealing brickwork movement joints, render, cladding and façade joints for South Kenton, backed by a one-year guarantee. Ask us for a quote.
- Sealant pulling away from one side of the joint
- Weathered mastic that no longer stretches
- Damp patches traced to an open external joint
External mastic for homes and businesses in South Kenton
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the line blends in. If you’re dealing with hard, crazed mastic that has stopped moving and panel joints letting water in, we can put it right, on joints between brick and frames, render & cladding joints and brickwork movement joints alike.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall, and both kinds of building are found across London.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Place
- South Kenton (HA9, HA0, HA3)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Your questions about external mastic in South Kenton
Do you cover South Kenton for external mastic?
Yes. We work across London and the South East, and South Kenton is part of that. You can call 0345 464 0079 or drop us an email and let us know what needs doing.
Can parking be tricky for a visit in South Kenton?
Parking in South Kenton, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Is there any odour?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
How long before the joint can be used?
It depends on the product and the temperature. Before we leave, we’ll tell you the cure time.
How often do external joints need resealing?
It depends on the exposure, the movement and the product. Treat it as a maintenance item and look at it yearly and renew it when it starts to fail.
What do you need from me for a quote?
Just the basics: where it is, what you’ve noticed and how we reach it. After that, simply ring 0345 464 0079 or send us an email.
How do I get a quote for external mastic in South Kenton?
It depends on the job, so we quote each one individually. For a quick quote, ring 0345 464 0079 or send us an email with a short description of the job.
Will you leave a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
What we’re called out for in South Kenton
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
People generally contact us when they notice one of these:
- Brick movement joints where the sealant has split
- Failed sealant between panels on a façade
- Weathered mastic that no longer stretches
- Weeds or debris growing in open joints
Homes close to Church of the Annunciation include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What your quote should include
- The length of the guarantee
- When the joint can take water or movement
- Whether all the old sealant comes out first
- Whether you can choose the colour
Leave it or put it right?
Running new sealant over the old bead rarely lasts. The new layer can’t bond properly to old, weathered material, so the old joint is cut out fully first. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler for homes in South Kenton.
Combining jobs into one visit is generally more efficient than separate visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
Why us?
- You choose the colour before work begins
- More than 20 years in sealant work
- Anti-fungal sanitary silicone in wet areas
- Neat joints and a tidy finish
Towns and villages near South Kenton
Other services in South Kenton
Should I try it myself first?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.
How the job changes by surface
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. We reseal their joints with backing rod and a flexible product.
What we do, step by step
We keep the work tidy and contained to the joints we’re treating. Expect the work to take a few hours for a handful of joints, longer for a whole elevation, and we tell you how long to leave it before we go. In South Kenton, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We start by walking round the building and agreeing the joints and the access.
- 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
- Mention if the joints have been sealed before
- For indoor joints, keep the area dry beforehand if you can
- Mention any sign-in or site rules at work premises
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work and send you a clear quote.
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What affects the cost of external mastic
Jobs vary more than people expect. The main factors:
- The type of sealant required
- How much old sealant there is and how hard it is to remove
- Access and height
- Whether there’s mould to deal with
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What we need to know
To help us quote quickly, let us know:
- How we’d reach the joints
- What the problem is, such as mould, gaps, leaks or cracking
- The address or postcode of the job
- How many joints, rooms or windows are involved
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or send us an email.
Outside joints around South Kenton
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. London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts.
As a London address, South Kenton can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. For landlords with property near South Kenton station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
South Kenton is about 1 mile north-west of Wembley, in Greater London. From the centre of South Kenton to the outskirts, external mastic is available for homes and businesses alike. South Kenton is one of 764 places in Greater London we cover. London is on our list too, around 10 miles away.
Here we cover the HA9, HA0 and HA3 postcode area for external mastic. Whether your property is on Peel Road, Holt Road and Byron Road or a nearby road, we can help. Neighbouring places we cover for external mastic include Northwick Park (1 mile west), Kenton (1 mile north), North Wembley (1 mile south), Brondesbury Park (1 mile south) and Harrow on the Hill (1 mile west). Within a short drive, we also cover London (10 miles south-east), City of Westminster (8 miles south-east), Marylebone (8 miles south-east), Kensington (7 miles south-east), St Pancras (9 miles east) and Shoreditch (10 miles east).
Near you in South Kenton
We work in homes and buildings around Windermere pub, Preston Park and Wembley High Technology College and the streets around them. There’s a railway station in South Kenton itself: South Kenton station. A little further out are St. Mark's Hospital (0.6 miles north-west) and Kodak Museum (2.2 miles north-west). For a walk, there’s Castlebar Hill and Masons Field.
When it isn’t the sealant
To be straight with you, there are a few things sealant won’t fix:
- Walls that need new movement joints cut into them
- Cracking across the wall rather than at a joint
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly.
Surfaces we seal
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Brickwork movement joints
- Copings & trims
- Concrete & block