Greater London · England
Sand mastic for sash & case windows in West Green, Greater London
Sand mastic for West Green and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Patchy fillers round a sash window
- Wind and rain getting in round a sash window
- Weathered mastic on the most exposed windows
Sand mastic for homes and businesses in West Green
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. If you’re dealing with window mastic to renew ahead of painting and mastic round period door frames that has failed, we can help, whatever the surface.
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, in West Green as anywhere.
You are covered for a year from the day we finish. If anything isn’t right with it, phone 0345 464 0079 or drop us an email.
- Location
- West Green (N15, N17, N4)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Also near West Green
More services for West Green
When it is not the sealant
We won’t take on work that won’t last, so here’s what sealant can’t put right:
- Damaged stone surrounds
- Putty and glazing repairs
- Planning or listed building consent (your local planning authority decides)
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly.
What we seal
- Brick reveals
- Sash and case windows
- Period & listed homes
- Timber door frames
- Tenement windows
- Stone surrounds
Common problems we fix in West Green
Decorating can disturb tired mastic. It’s often found when windows are being prepared for paint, which is a good time to renew it.
These are the problems we are asked about most:
- Wind and rain getting in round a sash window
- Cement or filler used on old window joints that has cracked
- Tired mastic found when preparing windows for paint
- Cracked mastic round a front door frame
Letting a property close to Seven Sisters station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Questions to ask before booking
- Whether all the old sealant comes out first
- Whether VAT is included
- What preparation is included
- Whether the sealant suits the joint
What affects the quote in West Green
We don’t publish a price list. The quote depends on:
- When we can work, for business premises
- The product the joint needs
- The amount of work
- Whether the work is at height
What it costs 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 work begins, so you know where you stand.
Helping us quote
You do not need to know the technical terms. It helps if you can tell us:
- How we’d reach the joints
- Whether it has been sealed before
- What the problem is, such as mould, gaps, leaks or cracking
- If it’s domestic, commercial or a hotel
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. When it suits you, phone 0345 464 0079 or send us an email.
How the visit works
We keep the work tidy and contained to the joints we are treating, so you can carry on as normal. Expect the work to take a few hours for a single window, longer for several, and we tell you how long to leave it before we go. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in West Green. 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.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Preparing for the visit
- Tell us about any water getting in
- Keep children and pets away from the work area
- Mention if the joints have been sealed before
How to get a quote
For sand mastic in West Green, ring 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Related advice
Sand mastic in West Green: local notes
In a converted house or block, who looks after the windows depends on the lease, so check that before you book. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Schools such as West Green Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. As a London address, West Green can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
West Green is about 2 miles north-west of West Hackney, in Greater London. Every kind of property in West Green is covered for sand mastic. Every job comes with our one-year guarantee. 764 places in Greater London are on our list. We also work in London, about 6 miles from West Green.
All of N15, N17 and N4 is covered for sand mastic, from the main roads to the quietest streets. Whether your property is on Ida Road, Elmar Road and Ripon Road or a nearby road, we can help. Other places close to West Green include Duckett's Green (1 mile north-west), St Ann's (1 mile south-east), Harringay (1 mile south-west), Broadwater Farm (1 mile north-east) and Tottenham Green (1 mile east). Further out, we also cover London (6 miles south), City of Westminster (6 miles south-west), Marylebone (5 miles south-west), Kensington (8 miles south-west), St Pancras (4 miles south) and Shoreditch (4 miles south).
What’s near West Green
In West Green, that means homes and buildings near The Queens Head pub, Church of St Andrew and Moselle Upper School and the streets around them. Nearby too are Downhills Park (less than half a mile north) and Park View School (under half a mile north). The closest station to West Green is Seven Sisters station, about 0.7 miles east of the centre. Other landmarks nearby include Markfield Beam Engine and Museum (1.3 miles east) and Greentrees Hospital (1.7 miles north). The countryside around West Green includes Railway Fields and Hollow Pond.
Different surfaces, different methods
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We work on single windows or whole elevations.
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
West Green: your questions answered
Do you cover West Green for sand mastic?
Yes. Our work covers London and the South East, and West Green is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
Is parking an issue for sand mastic in West Green?
Parking in West Green, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Can I choose the sealant colour?
We help you choose a colour that suits, from white and clear to greys and other shades. The product needed can limit the range.
Can you do several jobs on one visit?
Yes, we can. More than one area can be quoted together.
I’m a tenant. Can you help?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator.
Do I need permission for sand mastic on a listed building?
Speak to your local planning authority before work starts. Sand mastic is often favoured as like for like, but they decide.
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Ask the planning authority about consent for listed or conservation-area homes
- Take care around the mastic when scraping paint
- Make sure water runs off the sill
- Have rotten timber repaired before new mastic goes in
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
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.