Greater London · England
External Mastic in Willesden Green
Movement joints in Willesden Green need attention? We remove the old material, prepare the joints and seal them properly.
- Failed seals between different materials
- Failed sealant between panels on a façade
- Plants rooting in failed movement joints
How we handle external mastic in Willesden Green
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall so the line blends in. If you have damp patches traced to an open external joint and panel joints letting water in, we can help.
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.
Every job comes with a 12-month guarantee.
- Where
- Willesden Green (NW10, NW2, NW6)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Keep movement joints as flexible joints, not mortar
- Check the sealant is paintable before painting near it
- Point out the joints to other trades
- Fix overflowing gutters above sealed joints
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead over time.
A joint that has stopped moving pushes the movement elsewhere, normally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
When to call us in Willesden Green
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.
The most common problems we see are:
- Sealant pulling away from one side of the joint
- Weathered mastic that no longer stretches
- Failed sealant between panels on a façade
- Joints with sealant missing in places
Letting a property close to Kensal Rise station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Before booking anyone
- What product goes in the joint
- How the colour is chosen
- Is the old sealant removed completely?
- What the quote includes, VAT included or not
Your questions about external mastic in Willesden Green
Do you work for landlords with property near Kensal Rise station?
Yes. We work for landlords and letting agents as well as householders. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Can parking be tricky for a visit in Willesden Green?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator.
Do the sealants smell?
That depends on the sealant. Some products have a noticeable smell, others very little, and any smell fades as they cure.
What do you put in the joint?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Is it OK to seal over old sealant?
No, and we never do. It may look fine at first, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Do you guarantee your work?
Yes. Each job is guaranteed for twelve months, wherever you are.
For landlords 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.
Letting agents often deal with us directly. Tell us the address, the job and how access works.
How we quote for external mastic
The quote reflects the job in front of us. We take into account:
- Any mould that needs treating
- The old material and how stubborn it is
- How many areas need sealing
- Working hours on commercial sites
The cost reflects the work involved, not guesswork. That is why we ask a few questions first and give you a clear quote before we start.
Asking for a quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Access, such as stairs, a lift or height
- What’s wrong with the joints now
- A few pictures by email, if you can
- Whether it’s a home or a business
To get a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Willesden Green buildings and the weather
Historic houses like Fenton House (about 2.5 miles north-east) are a reminder that the area around Willesden Green has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Willesden Green is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. In the older streets around Church of St Andrew, an extension built onto an older house moves differently, and the joint between them takes the strain.
Willesden Green is about 1 mile south-east of Neasden, in Greater London. Willesden Green gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Willesden Green is one of 764 places in Greater London we cover. London is on our list too, around 7 miles away.
We cover every part of NW10, NW2 and NW6 for external mastic. You’ll find streets such as Fry Road, High Road and Dean Road, and we cover them all. Close by, we work in Willesden (1 mile north), College Park (1 mile south), Kensal Green (1 mile south), Harlesden (1 mile south-west) and Kensal Rise (1 mile south-east). We also work in nearby towns such as London (7 miles south-east), City of Westminster (4 miles south-east), Marylebone (4 miles south-east), Kensington (3 miles south-east), St Pancras (5 miles east) and Shoreditch (7 miles east).
Landmarks near Willesden Green
Around Willesden Green, our work takes us to homes and buildings near Roundwood Park, Brondesbury College and Capital City Academy and the streets around them. For rail, the closest station is Kensal Rise station, about 0.7 miles south-east. Well-known places in the area include O2 Centre (2.2 miles east) and Brent Museum and Archives (less than half a mile north). For a walk, there’s Campden Hill and Westbere Copse.
When it is not the sealant
To be straight with you, some problems need a different trade:
- Damp that is not coming from the joint
- Structural movement, which needs a surveyor or engineer
- Cracked brickwork or render that needs a builder or plasterer
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think.
Surfaces we seal
- Façade panels
- Render & cladding joints
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints
- Copings & trims
How the visit works
On the day, we look over the joints with you first, so you know exactly what we’re doing. Surfaces next to the work are protected before any work begins. The work usually takes a few hours for a handful of joints, longer for a whole elevation. In Willesden Green, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us 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.
- 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
- Mention any sign-in or site rules at work premises
- Let us know about earlier repairs to the joints
- Clear the area around the work
Getting a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Advice
Also near Willesden Green
Other services in Willesden Green
DIY sealant or a professional job?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.