Greater London · England
Edmonton Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Edmonton, with a one-year guarantee on every job. Call for a quick quote.
- Failed mastic on an exposed elevation
- Mastic dropping out of the joint
- Gaps where the frame meets the masonry
Why act early in Edmonton
Silicone might seem the quicker option, but on period stone or brick it often looks out of place. Sand mastic is the traditional material and blends with the stone or brick. In a flat in Edmonton, 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.
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Why Edmonton customers choose us
- Tidy, careful work
- ARBOMaster approved applicator
- Anti-fungal silicone where joints get wet
- More than 20 years in sealant work
Take a look at how sealant jobs are priced or customer reviews.
Sand mastic in Edmonton
For a listed home or one in a conservation area, ask your local planning authority whether consent is needed for work to windows. Like-for-like sand mastic is often the preferred finish. Common call-outs are for a silicone bead on a sash window that spoils the look and gaps where the frame meets the masonry, on period & listed homes, brick reveals and tenement windows.
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, letting in draughts and water.
All our work comes with a one-year guarantee, wherever you are in Greater London.
- Place
- Edmonton (N9, N18, N13, EN1)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
For landlords and businesses
If you manage several properties in or around Edmonton, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Sand mastic in Edmonton: local notes
With historic houses such as Bruce Castle (about 1.8 miles south) nearby, there’s older building stock in the area around Edmonton as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you look after a building such as Brettenham Primary School, the mastic around its windows and doors needs looking after like any other building’s. Letting a property close to Edmonton Green station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Edmonton is about 9 miles north-east of City of Westminster, in Greater London. For sand mastic in and around Edmonton, it’s easy to get a quote: please ring 0345 464 0079 or email us. We are based in Crawley and cover Greater London, Edmonton included. Across Greater London, we cover 764 places, Edmonton among them. London is on our list too, around 9 miles away.
Every address in N9, N18, N13 and EN1 is within our area for sand mastic, from the main roads to the quietest streets. Streets in the area include The Broadway, Plevna Road and Galahad Road, all of which we cover. With the B137 and B154 close by, Edmonton is simple for us to get to for sand mastic. We also cover the places around Edmonton: Upper Edmonton (1 mile south), Picketts Lock (1 mile east), Northumberland Park (1 mile south), Ponders End (1 mile north-east) and Bush Hill Park (1 mile north-west). Further out, we also cover London (9 miles south), City of Westminster (9 miles south-west), Marylebone (8 miles south-west), Kensington (10 miles south-west), St Pancras (7 miles south) and Shoreditch (7 miles south).
Near you in Edmonton
In Edmonton, that means homes and buildings near NiW Furniture pub, The Latymer School and Starks Field School and the streets around them. Edmonton has its own railway station: Edmonton Green station. A little further out are Edmonton Green Shopping Centre (under half a mile north-east) and North Middlesex University Hospital (1 mile south-west). The countryside around Edmonton includes Highams Park Lake and Ainslie Wood.
Surface by surface
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It gives a traditional finish.
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
Also near Edmonton
More services for Edmonton
How to look after the new joints
Simple care keeps the joints in good condition. We recommend:
- Leave the new mastic unpainted
- Inspect the joints round the windows every year or so
- Plan mastic work ahead of painting
- Go gently near the mastic when preparing windows
Avoid sealing over the mastic with silicone. If anything cracks, get it looked at before trying a quick fix.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
Signs you need sand mastic in Edmonton
Paint, silicone or cement used over old mastic causes problems. They do not move with the timber and we normally remove them.
Signs it’s time to call us include:
- Mastic round period door frames that has failed
- Gaps between timber frames and stone or brick
- Draughty sash windows at the surround
- Patchy fillers round a sash window
As a London address, Edmonton can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Questions to ask before booking
- What guarantee comes with the work
- How much experience the applicator has
- What product goes in the joint
- How hidden problems are handled
DIY versus a professional finish
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.
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
What we do, step by step
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes anything from a few hours to a full day, depending on how many windows. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Let us know if you’ve seen damp or leaks
- Mention if the joints have been sealed before
How to get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
Read more
Edmonton: your questions answered
Is Edmonton in your area for sand mastic?
Yes. We work across London and the South East, and Edmonton is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear quote.
I let a flat near Edmonton Green station. Can you help?
Yes, we work for landlords and agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before we start.
Which products do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
How long does sand mastic take to go off?
It skins over fairly quickly but takes longer to harden fully. We’ll explain what to expect before we leave.
Do you offer different sealant colours?
In most cases you can choose. We’ll explain which colours are available.
Can old silicone round a sash window be swapped for sand mastic?
In most cases. We remove the silicone and clean the joint before the sand mastic goes in.
Is consent needed for window work on a listed home?
Checking first is sensible. Your local planning authority can say if consent is needed for work on a listed home or in a conservation area.
Do you have insurance?
Yes. We are fully insured.