Greater London · England
Sand mastic for sash & case windows in North End, Greater London
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for North End, backed by a one-year guarantee. Ask us for a quote.
- Mastic that needs renewing before redecorating
- Mastic dropping out of the joint
- Weathered mastic on the most exposed windows
What we can’t put right
Sealant isn’t the answer to every problem, and we’d rather say so up front. It won’t solve:
- Damaged stone surrounds
- Sashes that rattle, stick or will not open
- Broken panes
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think.
Where we work in North End
- Tenement windows
- Period & listed homes
- Sash and case windows
- Timber door frames
- Stone surrounds
- Brick reveals
Sand mastic in North End
Traditional burnt sand mastic that sits naturally against stone and brick. It suits period and listed homes, where modern sealant can look out of place. We work on timber door frames, tenement windows and sash and case windows, and the jobs we see most are crumbling sand mastic round a window and gaps where the frame meets the masonry.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in North End.
We stand behind the work with a one-year guarantee, so you’re not left on your own once the job is done.
- Place
- North End (W14, SW6, SW5)
- Region
- Greater London
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How it works
Before we leave, we go over the finished joints with you and explain the cure time. The work normally takes a few hours per window, depending on the condition of the joints, depending on the size of the job. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in North End. It helps if you can point us to a visitor permit or a bay close to the door.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Tell us if parking is tricky
- Move anything stored near the joints
- Mention any leaks or damp you’ve noticed
Ask for a quote
We do not publish a price list. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or email us.
Advice
Nearby places to North End
More services for North End
For landlords and businesses
For anyone letting property in or around North End, jobs at different addresses can go on one quote. Send us the addresses and the work at each, and photos by email help.
Letting agents and landlords in North End can book us as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
Sand mastic in North End: local notes
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near St. Andrew's Fulham Fields, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Letting a property close to Kensington Olympia station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about.
North End is about 1 mile south of Kensington, in Greater London. Across the W14 area, we cover sand mastic for homes and businesses. We cover 764 towns and villages across Greater London.
Jobs for sand mastic in W14, SW6 and SW5 is quoted and booked the same way as anywhere else. Sand mastic is available to properties on Sun Road, Star Road and Field Road and the roads around them. We also cover West Kensington (1 mile east), Brook Green (1 mile north-west), Fulham (1 mile south), Hammersmith (1 mile west) and Brackenbury Village (1 mile north-west). Further out, we also cover London (5 miles east), City of Westminster (3 miles north-east), Marylebone (3 miles north-east), St Pancras (5 miles north-east), Shoreditch (6 miles north-east) and Walthamstow (10 miles north-east).
Near you in North End
Typical jobs here are in homes near Seven Stars pub, Polish Library POSK in London and Avonmore Primary School, among other places. North End’s nearest station is Kensington Olympia station, roughly 0.5 miles north. Well-known places in the area include Hammersmith Broadway (0.7 miles west) and Montfichet's Tower (4.8 miles east). Open spaces near North End include WWT London Wetland Centre and Campden Hill.
How to look after the new joints
Aftercare is simple:
- Get any rot dealt with first
- Ask the planning authority about consent for listed or conservation-area homes
- Plan mastic work ahead of painting
- Check the mastic when you check the paintwork
Do not touch or press the mastic while it hardens. It forms a skin fairly soon, but takes longer to harden fully.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
DIY sealant or a professional job?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Why it’s worth doing now in North End
New mastic over crumbling mastic won’t hold. Raking out and preparing the joint gives it a sound base so the new mastic stays put. In a flat in North End, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Why book with us
- ARBOMaster approved applicator
- Arbo and Everbuild products
- Every job guaranteed for a year
- Rated 4.9 stars on Google
Read how sealant jobs are priced and customer reviews.
North End questions
Can parking be tricky for a visit in North End?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
I let a flat near Kensington Olympia station. Can you help?
Yes, we work for landlords and letting agents. You can phone 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.
Is there any odour?
Sometimes, a little. It fades as the sealant cures, and ventilation helps.
Which is right for my windows, sand mastic or modern sealant?
Sand mastic normally suits period timber windows best. Modern frames normally suit a flexible sealant, and we’ll explain why.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
What exactly is sand mastic?
Sand mastic is a traditional material for pointing round windows and doors. It combines sand with a linseed-oil-based binder.
Are you ARBOMaster approved?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Can old silicone round a sash window be swapped for sand mastic?
Yes. The silicone is cut out and the joint cleaned before the sand mastic goes in.
When to call us in North End
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows.
Any of these means the joints need attention:
- Gaps between timber frames and stone or brick
- Crumbling sand mastic round a window
- Draughty sash windows at the surround
- Weathered mastic on the most exposed windows
North End is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Questions to ask before you book
- How the surfaces are prepared before sealing
- What guarantee comes with the work
- What the quote includes, VAT included or not
- What the cure time is