Greater London · England
Willesden Green Window Mastic
Window mastic for Willesden Green, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Draughty joints inside around the window
- White mastic on grey or black frames
- Rain getting in at the frame or under the sill
When something else is needed
We will always be straight with you, so here’s what new sealant will not do:
- Faulty window hardware
- A frame that has rotted at the joint
- Draughts through the window seals rather than the frame
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think.
Joints and surfaces we work on
- Aluminium frames
- Window sills
- uPVC windows
- Patio & French doors
- Timber windows & doors
- Composite doors
How we handle window mastic in Willesden Green
If you can feel air around a shut window, the gap is often at the frame. A new joint stops the air getting through and quietens the whistle on windy days. Where the air is getting in through the window itself, we’ll say so. Typical jobs include water coming in at the bottom corners of a door and untidy mastic left by window fitters, on uPVC windows, aluminium frames and composite doors.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease usually says who is responsible for the windows, so it’s worth checking before booking, and access in Willesden Green is something to talk through when you book.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Location
- Willesden Green (NW10, NW2, NW6)
- Region
- Greater London
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Keeping the joints in good condition
Aftercare is simple:
- Do not paint over the silicone
- Wash the frames with mild soapy water
- Avoid blasting the frames with a pressure washer
- Make sure the drainage slots are not blocked
Try not to touch the new joint while it cures, for as long as we advise. Keep jet washers away from the frames.
Water gets in quietly when mastic fails. You might not see it until plaster blows or a damp patch appears inside. Early resealing stops it reaching that point.
How it works
When we arrive, we start by going over the job with you, so you know exactly what we’re doing. Surfaces next to the work are protected before any work begins. The work normally takes a morning for a couple of windows and a door. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Willesden Green. It helps if you can point us to a visitor permit or a bay close to the door.
- We check how each frame can be reached safely.
- All the failed sealant is cut away.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Preparing for the visit
- Keep pets and children clear of the area while we work
- Let us know about stairs, lifts or work at height
- Tell us about any water getting in
Get a quote
To get a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.
Advice
Why it’s worth doing now in Willesden Green
A quick bead over the top of old mastic looks like an easy fix, but it won’t grip old, dirty sealant. It soon lifts and the leak carries on behind it. The old mastic has to come out. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Willesden Green, the repair is bigger than the sealant job would have been.
Leaving a failed joint usually makes the job bigger, not smaller, as water and mould keep getting in. If you are unsure, phone 0345 464 0079 or send us an email for an honest opinion and a quote.
What you get with us
- Sanitary silicone with an anti-fungal additive in wet areas
- We agree the colour with you first
- Trusted Arbo and Everbuild sealants
- Colour picked to suit the job
Take a look at what affects the cost or what customers say.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Towns and villages near Willesden Green
More services for Willesden Green
When to call us in Willesden Green
Joints that are too thin or too deep fail early. A thin smear across a wide gap has nothing to it, and a gap filled solid can’t flex. That’s what backing rod is for.
The problems people normally mention when they call include:
- Rushed sealant from a window installation
- Draughts coming in around windows and doors
- Draughty joints inside around the window
- Rain getting in at the frame or under the sill
Managing a site like Donnington Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
What your quote should include
- What the cure time is
- What happens if they find a problem under the old sealant
- What preparation is included
- What the quote includes, VAT included or not
FAQs for Willesden Green
Is parking a problem for a job in Willesden Green?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Can you do window mastic in Willesden Green?
Yes. Our work covers London and the South East, and Willesden Green is part of that. You can ring 0345 464 0079 or email us and tell us what needs doing, and we’ll send you a clear quote.
How much does window mastic cost in Willesden Green?
Size, access and the old material all affect the cost. Ask us for a quote.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few pictures.
Do you work for landlords and businesses?
Yes. Domestic, commercial and hotel work are all part of what we do.
Do you have sealant for grey or black windows?
Yes. White, brown, anthracite grey, black and clear sealants are all available, so the joint suits the frame.
Can you seal the gap between the frame and the plaster indoors?
Yes, we do both. Inside, the joint between frame and plaster is sealed neatly.
Will there be a smell?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
Willesden Green homes 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 frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
If you live in an older home near Church of St Andrew, frames set in older brick or stone need a sealant that suits the wall as well as the frame. For landlords with property near Kensal Rise station, renewing tired window mastic between tenants heads off draught and damp complaints.
Willesden Green is about 1 mile south-east of Neasden, in Greater London. If you need window mastic in Willesden Green, please call 0345 464 0079 or drop us an email for a quick quote. We are based in Crawley and cover Greater London, Willesden Green included. Our Greater London coverage runs to 764 places, Willesden Green among them. We also work in London, about 7 miles from Willesden Green.
Here we cover the NW10, NW2 and NW6 postcode area for window mastic. If you need window mastic at a property on Fry Road, High Road and Dean Road or a nearby road, we can help. If you’re just outside Willesden Green, we cover 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). Larger places within reach include 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).
What’s near Willesden Green
Locally, jobs take us to homes and businesses close to Roundwood Park, Brondesbury College and Capital City Academy. Willesden Green’s nearest station is Kensal Rise station, roughly 0.7 miles south-east of the centre. Well-known places in the area include O2 Centre (2.2 miles east) and Brent Museum and Archives (within half a mile north). The countryside around Willesden Green includes Campden Hill and Westbere Copse.
What affects the quote in Willesden Green
There’s no set price list. What we look at:
- Whether old sealant or filler has to be cut out
- Whether there’s mould to deal with
- The type of sealant required
- The number and length of the joints
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or drop us an email and we’ll talk you through it.
Asking for a quote
When you call or email, it’s useful to know:
- Any access issues, like height or stairs
- Any previous sealing or DIY work
- How many joints, rooms or windows are involved
- What’s wrong with the joints now
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To get started, phone 0345 464 0079 or drop us an email.