Greater London · England
Kingsbury Sand Mastic
Problem with your window and door surrounds in Kingsbury? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Gaps where the frame meets the masonry
- Old cement repairs round a window that have failed
- Silicone on a period window that looks wrong
What happens if it’s left?
Draughts round a sash window are not always the sashes. Open mastic joints round the box can let air in, and renewing the mastic closes them. In London conversions, one flat’s bathroom is often above another flat’s ceiling, 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.
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. Ask us for a quote and we’ll go through it with you.
Why Kingsbury clients choose us
- Homes, businesses and hotels
- Tidy, careful work
- Sanitary silicone with an anti-fungal additive in wet areas
- 12-month guarantee on every job
Read what affects the cost and customer reviews.
Sand mastic for homes and businesses in Kingsbury
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s made from sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. Common call-outs are for gaps round a timber door in stone or brick and wind and rain getting in round a sash window, on tenement windows, period & listed homes and brick reveals.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Location
- Kingsbury (NW9, HA3, HA9)
- Region
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Common problems we fix in Kingsbury
Decorating can disturb tired mastic. It’s often found when windows are being prepared for paint, which is a good time to renew it.
Look out for these signs:
- Window mastic to renew ahead of painting
- Old sand mastic that has cracked, crumbled or fallen out
- Cement or filler used on old window joints that has cracked
- Mastic round period door frames that has failed
If you live in an older home near Church of the Holy Innocents, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Comparing quotes
- Whether VAT is included
- What product goes in the joint
- What happens if they find a problem under the old sealant
- Are they insured?
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will give you a quote.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Avoid heavy scraping on the mastic joint
- Ask us before painting near the mastic
- Look over the window mastic once a year
- Avoid patching sand mastic with silicone
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look before trying a quick fix.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger.
Different surfaces, different methods
Timber door frames
Doors face weather and wear, so their mastic can fail sooner. It’s renewed by hand.
Period and listed homes
A traditional finish suits a period property.
Common questions in Kingsbury
Can you do sand mastic in Kingsbury?
Yes, Kingsbury is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or drop us an email and tell us what needs doing.
Is parking an issue for sand mastic in Kingsbury?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints, and the area is left clean when we finish.
What’s sand mastic made of?
Sand plus a binder based on linseed oil. It’s applied by hand and shaped to suit the surround.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Do you have insurance?
Yes. Full insurance covers our work.
What does sand mastic cost?
Every job is different, so each one gets its own quote. For a quick quote, ring 0345 464 0079 or send us an email with a short description of the job.
Which is right for my windows, sand mastic or modern sealant?
It depends on the window. Period windows in stone or brick usually suit sand mastic, while modern frames normally get a flexible sealant.
Windows and doors in Kingsbury
In a converted house or block, who looks after the windows depends on the lease, so check that before booking. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Schools such as Kingsbury Green Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. For landlords with property near Hendon station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Kingsbury is about 2 miles north-east of Wembley, in Greater London. Kingsbury gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. Our area takes in 764 places across Greater London, from the larger towns to small villages. There’s also a page for London, roughly 10 miles from Kingsbury.
Every address in NW9, HA3 and HA9 is covered for sand mastic. Streets in the area include Bacon Lane, Slough Lane and Minterne Road, all of which we cover. Main roads around Kingsbury include the A4006, so getting to you is simple. Close by, we work in Queensbury (1 mile north-west), West Hendon (1 mile east), The Hyde (1 mile east), Preston (1 mile south-west) and Colindale (1 mile north-east). Within a short drive, we also cover London (10 miles south-east), City of Westminster (7 miles south-east), Marylebone (7 miles south-east), Kensington (6 miles south-east), St Pancras (8 miles south-east) and Shoreditch (9 miles south-east).
Around Kingsbury
In Kingsbury, that means homes and buildings near JFS, Woodfield School and J.J. Moon's pub, among other places. Kingsbury’s nearest station is Hendon station, roughly 1.5 miles east. Other landmarks nearby include Church Farmhouse Museum (2.1 miles east) and London Designer Outlet (1.9 miles south). Open spaces near Kingsbury include Castlebar Hill and Darland's Lake.
How it works
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. Most jobs take anything from a few hours to a full day, depending on how many windows. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Kingsbury. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
How to prepare
- Let us know about earlier repairs to the joints
- Mention any leaks or damp you’ve noticed
- Let us know about parking restrictions
Ask for a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. Whenever you are ready, phone 0345 464 0079 or drop us an email.
Read more
What affects the quote in Kingsbury
For a quick quote, just ask. What matters most is:
- The amount of work
- Access and height
- When we can work, for business premises
- Whether there’s mould to deal with
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before we start.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- A few pictures by email, if you can
- Any access issues, like height or stairs
- If it’s domestic, commercial or a hotel
- What’s wrong with the joints now
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.