Greater London · England
External Mastic in Kensal Green
External mastic in Kensal Green from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Panel joints letting water in
- Weeds or debris growing in open joints
- Joints where the bead has come unstuck
About our external mastic in Kensal Green
For buildings in Kensal Green, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean joint faces and the right depth. If you are dealing with hard, crazed mastic that has stopped moving and rain getting behind render or cladding at a joint, we can help, whatever the surface.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so a leaking gutter joint or failed wall joint can affect more than one home. For a flat in Kensal Green, check the lease for who looks after the outside.
Every job comes with a one-year guarantee.
- Place
- Kensal Green (NW10, W10, NW6)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How the visit works
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for a handful of joints, longer for a whole elevation. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about earlier repairs to the joints
- Let us know about stairs, lifts or work at height
Getting a quote
Getting a quote is simple: tell us what needs doing and where and its rough size. A few pictures by email make the job easier to understand, and we will take it from there.
Advice
Your questions about external mastic in Kensal Green
Is parking an issue for external mastic in Kensal Green?
Parking in Kensal Green, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Do you cover Kensal Green for external mastic?
Yes, Kensal Green is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job, and we’ll send you a clear quote.
What do you need from me for a quote?
A short description and the location, plus pictures if you have them. If we need more, we will ask.
Do you remove the old sealant?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
I rent my home. Can I book you?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
Should I point up the gap in my brickwork?
No. Rigid materials cannot move with the wall and the joint fails. If it has already been filled, we can normally cut it out and reseal it.
Can you quote for more than one area?
Of course. Doing several areas at once is normally more efficient, so mention them when you ask for a quote.
Can new sealant go over the old?
No. Fresh sealant doesn’t stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Why act early in Kensal Green
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler for homes in Kensal Green.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll explain what it covers.
Why choose Mr Mastic in Kensal Green
- Trusted Arbo and Everbuild sealants
- Every job guaranteed for a year
- 4.9 on Google from 180+ five-star reviews
- Anti-fungal sanitary silicone in wet areas
Read our cost guide and what customers say.
Places near Kensal Green
What else we do in Kensal Green
When to call us in Kensal Green
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The new sealant then lets go long before it should.
Signs it’s time to call us include:
- Cracked joints where brick meets render or frames
- Leaking joints around cladding and façade panels
- Rain getting behind render or cladding at a joint
- Movement joints filled with mortar instead of sealant
As a London address, Kensal Green can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Questions to ask before booking
- How much experience the applicator has
- Whether VAT is included
- How the joint is cleaned and prepared
- When the joint can take water or movement
What affects the quote in Kensal Green
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Any mould that needs treating
- Any working-time requirements on site
- The number and length of the joints
- Which sealant suits the joint
Doing several joints on one visit normally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We will send you a clear quote for the lot.
What we need to know
When you contact us, it’s useful to know:
- Photos by email, if that is easy
- Any access issues, like height or stairs
- Whether it has been sealed before
- Roughly how big the job is
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or email us.
Kensal Green buildings and the weather
With historic houses such as Kensington Palace (about 2.4 miles south-east) nearby, there’s older building stock in the area around Kensal Green 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. London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts.
Letting a property close to Kensal Green station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies. If you look after a building such as Princess Frederica CofE Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Kensal Green is about 1 mile south-west of Kilburn, in Greater London. Our applicators cover external mastic for homeowners, landlords and businesses in Kensal Green and nearby, as part of our work across Greater London. Our Greater London coverage runs to 764 places, and Kensal Green is one of them. For nearby work, see our London page (6 miles or so).
Jobs for external mastic in NW10, W10 and NW6 works the same way as everywhere else we cover. You’ll find streets such as Waldo Road, Hazel Road and Hiley Road, and we cover them all. If you’re just outside Kensal Green, we cover Kensal Rise (1 mile east), College Park (1 mile west), North Kensington (1 mile south-east), Willesden Green (1 mile north) and Kensal Town (1 mile south-east). We also work in nearby towns such as London (6 miles east), City of Westminster (3 miles east), Marylebone (3 miles east), St Pancras (5 miles east), Shoreditch (6 miles east) and Walthamstow (9 miles north-east).
Landmarks near Kensal Green
Locally, jobs take us to homes and businesses close to Little Wormwood Scrubs, Queens Park Community School and The Masons Arms, among other places. There’s a railway station in Kensal Green itself: Kensal Green station. A little further out are Westfield London (1.6 miles south) and Princess Louise Hospital (0.7 miles south). Open spaces near Kensal Green include Greville Place nature reserve and The Long Water.
For landlords and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
DIY sealant or a professional job?
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.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
When it is not the sealant
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Render that is blown, hollow or coming away
- Rising or penetrating damp from elsewhere in the wall
- Subsidence or other structural problems
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Render & cladding joints
- Façade panels
- Joints between brick and frames