Greater London · England
External Mastic in West Kensington
External mastic in West Kensington from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Brick movement joints where the sealant has split
- Rain getting behind render or cladding at a joint
- Sealant that has lost its bond to the brick or render
Why act early in West Kensington
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render near the open joint, so the problem grows beyond the joint itself. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in West Kensington, the repair is bigger than a sealant job.
What you pay reflects the work, not guesswork. That’s why we ask a few questions first and agree the price before starting.
Why West Kensington customers choose us
- Domestic, commercial and hotel work
- Over 20 years’ experience
- White, clear, grey or coloured to suit, where the product allows
- We agree the colour with you first
External mastic for homes and businesses in West Kensington
Joints in render and cladding are easy to overlook until a damp patch appears. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a colour to suit. If you have plants rooting in failed movement joints and gaps where render, brick and frames meet, we can put it right, on façade panels, render & cladding joints and copings & trims alike.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall.
All of our work is guaranteed for twelve months, in West Kensington and everywhere else we cover.
- Where
- West Kensington (W14, SW6, SW5)
- Wider area
- Greater London
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
FAQs for West Kensington
I let a flat near Kensington Olympia station. Can you help?
Yes. We work for landlords and letting agents as well as homeowners. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
Is West Kensington in your area for external mastic?
Yes, West Kensington is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear price.
Where is Mr Mastic based?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Is it worth trying it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Do you hold any approvals?
Yes. We’re an ARBOMaster approved applicator.
How do I get a quote for external mastic in West Kensington?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we will talk you through it.
DIY versus a professional finish
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
How the visit works
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours to a few days, depending on the length of joint and the access. In West Kensington, as in most of London, parking needs a little planning. 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.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- Keep children and pets away from the work area
- Mention any tricky access
- Clear the area around the work
Getting a quote
We quote each job on its own, so the first step is telling us about yours. Simply phone 0345 464 0079 or drop us an email and describe the job.
Related advice
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Deal with leaking gutters that soak the joints below
- Tell anyone working on the walls about the movement joints
- Keep movement joints as flexible joints, not mortar
- Check the sealant is paintable before painting near it
Don’t let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Small splits are the time to act. At that stage it’s a simple cut out and reseal.
Nearby places to West Kensington
What else we do in West Kensington
What we cannot put right
We won’t take on work that won’t last, so these are the limits:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Loose or hollow render, which needs re-rendering
- Subsidence or other structural problems
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think.
Surfaces we seal
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Façade panels
- Joints between brick and frames
- Concrete & block
For landlords and businesses
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
We also work for property managers and facilities teams in West Kensington and across Greater London. We can quote a run of properties together, and we are fully insured for the work.
Walls and rooflines in West Kensington
With historic houses such as Garden Lodge (about 0.4 miles north-east) nearby, there’s older building stock in the area around West Kensington 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. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Schools such as The Fulham Boys School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Homes close to St Cuthbert's include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
West Kensington is about 1 mile south of Kensington, in Greater London. From the centre of West Kensington to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our Greater London coverage runs to 764 places, West Kensington among them.
Work in W14, SW6 and SW5 works the same way as everywhere else we cover. External mastic is available to properties on Sun Road, Star Road and Field Road. We also cover the places around West Kensington: North End (1 mile west), Brook Green (1 mile north-west), Fulham (1 mile south), Hammersmith (1 mile west) and Brackenbury Village (1 mile north-west). Within a short drive, we also cover London (5 miles east), City of Westminster (3 miles north-east), Marylebone (3 miles north-east), St Pancras (5 miles north-east), Shoreditch (6 miles north-east) and Walthamstow (10 miles north-east).
Around West Kensington
Around West Kensington, our work takes us to homes and buildings near Avonmore Primary School, Gwendwr Garden and Seven Stars pub. For rail, the closest station is Kensington Olympia station, about 0.5 miles north of the centre. A little further out are Chelsea Stadium Tour And Museum (1 mile south-east) and Fulham Hospital (0.6 miles south-west). For a walk, there’s Campden Hill and The Long Water.
Signs you need external mastic in West Kensington
Some movement joints have been pointed up with mortar. The joint cannot move, so the wall cracks somewhere else instead.
People generally contact us when they notice something like this:
- Weeds or debris growing in open joints
- Damp patches traced to an open external joint
- Brick movement joints where the sealant has split
- Old sealant gone brittle and cracked
Rented homes near Kensington Olympia station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- How long to leave it before use
- What insurance they hold
- Who does the work, and how experienced they are
- Whether you can choose the colour