Greater London · England
Kilburn Sand Mastic
Window and door surrounds in Kilburn need attention? We remove the old material, prepare the joints and seal them properly.
- Cracked mastic round a front door frame
- Patchy fillers round a sash window
- Failed mastic on an exposed elevation
Aftercare tips
Good habits help new joints last longer. A few tips:
- Look over the window mastic once a year
- Ask a joiner to look at soft timber first
- Do not run silicone over sand mastic
- Renew mastic before redecorating the windows
Leave the new mastic unpainted, as traditional guidance advises. Ask us before any decorating around it.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
Sand mastic in Kilburn, done properly
Sand mastic does not last for ever and gaps open up round the frame. Renewing it closes the gap and tidies the surround. We work on stone surrounds, sash and case windows and tenement windows, and the jobs we see most are mastic dropping out of the joint and a silicone bead on a sash window that spoils the look.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. Over the years, the sealant around them shrinks, cracks and pulls away, which is when draughts and damp patches appear in homes in Kilburn.
Our work is backed for twelve months.
- Place
- Kilburn (NW6, W9, W10)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
When to call us in Kilburn
Timber swells and shrinks with the weather. That movement opens up the mastic joint little by little.
The problems people usually mention when they call include:
- Gaps where the frame meets the masonry
- Old cement repairs round a window that have failed
- Mastic dropping out of the joint
- Gaps round a timber door in stone or brick
Managing a site like Salusbury Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
Before booking anyone
- What preparation is included
- Whether VAT is included
- What happens if the job turns out different
- Whether all the old sealant comes out first
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Kilburn: your questions answered
I let a flat near Queens Park (London) station. Can you help?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear price.
Is parking a problem for a job in Kilburn?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Do you cover Kilburn?
Yes. We’re based in Crawley and work across South East England, London and Scotland, Kilburn included.
What exactly is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
Is the work guaranteed?
There’s a 12-month guarantee on every job.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Where are you based?
We are a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
What sand mastic looks like in Kilburn
Historic houses like Winfield House (about 1.7 miles east) are a reminder that the area around Kilburn has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near St Anne's and St Andrew's, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Rented homes near Queens Park (London) station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Kilburn is about 3 miles north-west of City of Westminster, in Greater London. Whether you’re in the middle of Kilburn or further out, sand mastic is available for homes and businesses alike. Across Greater London, we cover 764 places, Kilburn among them.
Jobs for sand mastic in NW6, W9 and W10 is quoted and booked the same way as anywhere else. Sand mastic is available to properties on The Lane, Dyne Road and Quex Road and the roads around them. Being close to the A4003, Kilburn is simple for us to get to for sand mastic. We also cover the places around Kilburn: Queen's Park (1 mile south), Kensal Rise (1 mile south-west), Brondesbury (1 mile north), Kensal Town (1 mile south) and Kensal Green (1 mile south-west). We also work in nearby towns such as London (5 miles south-east), City of Westminster (3 miles south-east), Marylebone (3 miles south-east), Kensington (3 miles south), St Pancras (4 miles east) and Shoreditch (5 miles east).
Near you in Kilburn
In Kilburn, that means homes and buildings near The Brondesbury Arms, Maida Vale School and Queen’s Park. Kilburn has its own railway station: Queens Park (London) station. Well-known places in the area include Paddington General Hospital (1 mile south) and Brent Museum and Archives (1.3 miles north-west). Not far away are Greville Place nature reserve and Primrose Hill.
How we quote for sand mastic
The price is agreed before any work begins. It takes into account:
- How easy the joints are to reach
- How many rooms, windows or areas are involved
- When we can work, for business premises
- Whether old sealant or filler has to be cut out
The cost reflects the work involved, not guesswork. That is why we ask about the job first.
What to tell us for a quote
What to tell us when you ask for a quote:
- The rough size of the job
- A few pictures by email, if you can
- Whether it’s a home or a business
- Access, such as stairs, a lift or height
Every job is quoted individually. Simply ring 0345 464 0079 or email us and describe the job and send photos if you have them.
Surface by surface
Brick reveals
An open joint at a brick reveal lets weather in. New mastic seals the gap.
Period and listed homes
On a listed home or in a conservation area, the right material matters. Sand mastic is often the preferred finish.
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we’re fully insured for the work.
Failed sealant is one of the commonest items on a check-out report. We can quote for more than one property at once.
Also near Kilburn
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What happens on the day
When we arrive, we look over the joints with you first, so there are no surprises. Surfaces next to the work are protected before any work starts. Most jobs take a few hours for a single window, longer for several. For a job in Kilburn, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
How to prepare
- Mention if the joints have been sealed before
- Mention any parking rules near the property
- Tell us about any water getting in
How to get a quote
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work and give you a clear price.