Greater London · England
Sand mastic for sash & case windows in Wembley, Greater London
Our applicators work in Wembley on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly.
- Draughty sash windows at the surround
- Patchy fillers round a sash window
- Mastic dropping out of the joint
How we handle sand mastic in Wembley
Sand mastic doesn’t last for ever and gaps open up round the frame. We rake it out and renew it and tidies the surround. We work on stone surrounds, tenement windows and brick reveals, and the jobs we see most are old sand mastic that has cracked, crumbled or fallen out and mastic that needs renewing before redecorating.
Many London homes are flats, with windows high above the street. Who looks after the outside of the frames can depend on the lease, so check that first.
All our work is covered by a one-year guarantee.
- Location
- Wembley (HA9, HA0, HA1, NW9)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Windows and doors in Wembley
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.
If you live in an older home near St Augustine, the joint between an old wall and a newer frame is normally the first place rain gets in. Wembley is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Wembley is about 5 miles west of Hampstead, in Greater London. Our applicators cover sand mastic for householders, landlords and businesses in Wembley and nearby, as part of our work across Greater London. Wembley is one of 764 places in Greater London where we work. Our London page covers work nearby, about 10 miles away.
We cover every part of the HA9, HA0, HA1 and NW9 postcode area for sand mastic. Streets in the area include Market Way, London Road and Queenscourt, and we cover them all. With the A404 and A4088 close by, Wembley is easy for our applicators to reach. If you’re just outside Wembley, we cover Wembley Park (1 mile east), Preston (1 mile north), Mapesbury (1 mile south-east), Tokyngton (1 mile south-east) and Stonebridge Park (1 mile south-east). Further out, 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 east) and Shoreditch (10 miles east).
What’s near Wembley
Around Wembley, our work takes us to homes and buildings near Preston Manor School, Preston Park and Hilton London Wembley pub. For rail, the closest station is North Wembley station, about 0.5 miles west. Well-known places in the area include St. Mark's Hospital (1.5 miles north-west) and London Designer Outlet (0.5 miles south-east). For a walk, there’s Masons Field and Castlebar Hill.
How the visit works
Once we are on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take a few hours per window, depending on the condition of the joints. In a London area like Wembley, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic isn’t too thick.
- 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 sign-in or site rules at work premises
- Let us know about parking restrictions
Get a quote
To get a quote, call 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You will have a clear quote before work begins.
Read more
Common problems we fix in Wembley
Timber frames move with the seasons. That movement opens up the mastic joint over time.
People normally contact us after spotting one of these:
- Mastic dropping out of the joint
- Failed mastic on an exposed elevation
- Draughty sash windows at the surround
- Cement or filler used on old window joints that has cracked
If you look after a building such as Wembley Primary School, its window and door frames need their mastic kept sound, just like a home’s.
What to look for in a quote
- Whether you can choose the colour
- How the joint is cleaned and prepared
- How long the guarantee is
- Is the old sealant removed completely?
For landlords and businesses
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
If you manage several properties in or around Wembley, several properties can go on one quote. Just tell us the addresses and what each one needs.
Why deal with it now?
If you’re redecorating, renew the mastic first. Paint over cracked mastic will not stop the gaps, and the new mastic is traditionally left unpainted. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler for homes in Wembley.
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
What you get with us
- One-year guarantee on every job
- We’re fully insured
- Old sealant always removed completely
- We leave the area clean and tidy
Read our cost guide or our reviews.
Common questions in Wembley
Is parking an issue for sand mastic in Wembley?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Can you do sand mastic in Wembley?
Yes, Wembley is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear price.
Will you leave a mess?
Tidy work is part of the job. Nearby surfaces are protected, and the area is left clean when we finish.
Is it worth trying it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Is it OK to seal over old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Is it possible to take out silicone and use sand mastic instead?
Yes, we do this often. All the old silicone is removed first so the mastic can sit properly.
Is the work guaranteed?
Our 12-month guarantee applies on every job.
Do you work for letting agents?
Yes, we do. Domestic, commercial and hotel work are all part of what we do, and we are fully insured.
Aftercare tips
A little care helps the new joints last. We recommend:
- Keep modern sealant off the mastic
- Go gently near the mastic when preparing windows
- Make sure water runs off the sill
- Ask a joiner to look at soft timber first
Leave the new mastic alone while it firms up. It forms a skin fairly soon but needs longer to fully harden.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens as more mastic falls out.
Towns and villages near Wembley
More services for Wembley
Different surfaces, different methods
Sash and case windows
Sash windows are where we do most sand mastic work. Each joint round the box is raked out and renewed.
Period and listed homes
Many older homes were built with sand mastic round the windows. On listed buildings, check with your planning authority first.
Quotes for sand mastic in Wembley
The quote reflects the job in front of us. We take into account:
- Whether old sealant or filler has to be cut out
- The product the joint needs
- Any mould that needs treating
- How many rooms, windows or areas are involved
Leaving a failed joint usually makes the job bigger, not smaller, as water and mould keep getting in. If you are unsure, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
What to tell us for a quote
Before you ask for a quote, have a think about:
- How we’d reach the joints
- What the problem is, such as mould, gaps, leaks or cracking
- Photos by email, if that is easy
- Whether it’s a home or a business
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.