Greater London · England
External Mastic in Willesden
We cover Willesden for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Weeds or debris growing in open joints
- Failed sealant between panels on a façade
- Gaps where render, brick and frames meet
About our external mastic in Willesden
For buildings in Willesden, we reseal external joints of all kinds, from brick movement joints to cladding panels. The preparation is the same whatever the wall: clean joint faces and the right depth. If you’re dealing with brick movement joints where the sealant has split and failed sealant between panels on a façade, we can put it right, on brickwork movement joints, render & cladding joints and joints between brick and frames alike.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Willesden, tell us how high the joints are and how to reach the back of the building.
Whatever the size of the job, you get the same one-year guarantee.
- Where
- Willesden (NW10, NW2)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How it works
There’s no need to move everything out before we come, only the area right around the joints. Everything nearby is protected, and the job takes a few hours to a few days, depending on the length of joint and the access in most cases. In a London area like Willesden, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Mention any leaks or damp you’ve noticed
- Keep pets and children clear of the area while we work
- Tell us if parking is tricky
Ask for a quote
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we’ll explain what’s involved before giving you a price.
Read more
DIY sealant or a professional job?
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so tell us about it when you ask for a quote.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Outside joints around Willesden
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts.
Schools such as St Andrew and St Francis CofE Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For an older house near a landmark such as Church of St Andrew, an extension built onto an older house moves differently, and the joint between them takes the strain.
Willesden is about 2 miles west of Hampstead, in Greater London. From the centre of Willesden to the outskirts, we cover external mastic for every kind of property. Willesden is one of 764 towns and villages in Greater London where we work for external mastic. Our London page covers work nearby.
Postcode districts we cover here for external mastic: NW10 and NW2. Whether your property is on Tudor Mews, Chaplin Road and Belton Road or a nearby road, we can help. You’ll find Willesden on the B453, so it’s easy for us to get to with everything needed for external mastic. Close by, we work in Willesden Green (1 mile south), Neasden (1 mile north-west), Church End (1 mile west), Cricklewood (1 mile north-east) and Harlesden (1 mile south-west). Larger places within reach include London (7 miles south-east), City of Westminster (4 miles south-east), Marylebone (4 miles south-east), Kensington (4 miles south-east), St Pancras (5 miles east) and Shoreditch (7 miles east).
Near you in Willesden
Locally, jobs take us to homes and businesses close to Brondesbury College, Royal Oak Inn and Capital City Academy and the streets around them. The closest station to Willesden is Kensal Rise station, roughly 1.1 miles south-east. A little further out are Brent Cross Shopping Centre (2 miles north) and Brent Museum and Archives (within half a mile east). Green spaces nearby include The Long Water and Primrose Hill.
How the job changes by surface
Joints between dissimilar materials
Each side of the joint may need its own preparation. Both surfaces are cleaned and primed as the product requires.
Concrete and blockwork
Concrete faces can be dusty and porous, so cleaning and priming matter. We prime where the sealant needs it.
What affects the quote in Willesden
The quote reflects the job in front of us. We look at:
- Mould in or behind the old joints
- The number and length of the joints
- Whether old sealant or filler has to be cut out
- Whether the work is at height
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we’ll go through it with you.
Asking for a quote
Before you ask for a quote, have a think about:
- Roughly how big the job is
- Where the property is
- Any previous sealing or DIY work
- The problem you’ve noticed
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. When it suits you, ring 0345 464 0079 or send us an email.
Questions from Willesden
Is Willesden in your area for external mastic?
Yes, Willesden is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job.
Do you work for landlords with property near Kensal Rise station?
Yes. We work for letting agents and landlords as well as householders. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done and you’ll get one quote.
How do you reach high-level joints?
It depends on the height and the site. Low-level joints are straightforward; for higher ones, send details and we will confirm the access.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Can you work on commercial sites?
Yes. We can plan bigger jobs in stages.
Can you seal joints between render and window frames?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. The colour is chosen to suit.
What’s an expansion joint in brickwork?
A vertical gap in a long brick wall is generally a movement joint. It lets the bricks expand without cracking and needs a flexible seal, not mortar.
Why it’s worth doing now in Willesden
Resealing a run of joints in one go is usually better than patching one at a time. Joints of the same age tend to fail together and it means sorting access once. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Willesden, 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 give you a clear quote before work begins.
What you get with us
- 20+ years of sealant experience
- Trusted Arbo and Everbuild sealants
- Homes, businesses and hotels
- One-year guarantee on every job
Take a look at our cost guide or our reviews.
What we can’t put right
To be straight with you, some problems need a different trade:
- Failed render or damaged cladding panels
- Cutting new joints into brickwork, which is building work rather than sealant work
- 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 send us an email and we’ll tell you honestly.
Surfaces we seal
- Concrete & block
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
- Façade panels
- Render & cladding joints
Nearby places to Willesden
Also in Willesden
Do you need external mastic in Willesden?
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
The most common problems we see are:
- Hard, crazed mastic that has stopped moving
- Damp patches traced to an open external joint
- Movement joints filled with mortar instead of sealant
- Joints where the bead has come unstuck
Willesden is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Before you book anyone
- What preparation is included
- Are they insured?
- Is VAT in the price?
- How the colour is chosen