Greater London · England
Sand mastic for sash & case windows in Duckett's Green, Greater London
We cover Duckett's Green for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Mastic worn away on windows facing the weather
- Mastic that needs renewing before redecorating
- Old sand mastic that has cracked, crumbled or fallen out
DIY sealant or a professional job?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly.
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, then guaranteed for a year.
Sand mastic in Duckett's Green, done properly
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditionally, sand mastic is left unpainted and we’ll advise if you’re redecorating. We work on sash and case windows, tenement windows and brick reveals, and common reasons people get in touch are patchy fillers round a sash window and gaps between timber frames and stone or brick.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, letting in draughts and water.
Big or small, it’s backed by our 12-month guarantee.
- Location
- Duckett's Green (N15, N22, N8)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Towns and villages near Duckett's Green
Other services in Duckett's Green
For landlords and businesses
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Signs you need sand mastic in Duckett's Green
Shallow joints are a common cause. Mastic that is too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
People usually contact us after spotting one of these:
- Open joints round the window box
- Window mastic to renew ahead of painting
- Wind and rain getting in round a sash window
- Silicone on a period window that looks wrong
Rented homes near Hornsey station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Before you book anyone
- How long the guarantee is
- Who does the work, and how experienced they are
- What the cure time is
- Which colour the sealant will be
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Keep modern sealant off the mastic
- Look over the window mastic once a year
- Take care around the mastic when scraping paint
- Ask us before painting near the mastic
Leave the new mastic unpainted, which is the traditional advice. If you’re redecorating, ask us first.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
What happens on the day
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes a few hours per window, depending on the condition of the joints from start to finish. For a job in Duckett's Green, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We look at the surrounds with you and agree the joints to renew.
- 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.
- The surface is finished to suit the stone or brick.
Getting ready for the visit
- For business premises, tell us about site rules or sign-in
- Let us know about earlier repairs to the joints
- Let us know about stairs, lifts or work at height
Getting a quote
For sand mastic in Duckett's Green, call 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Read more
Windows and doors in Duckett's Green
Historic houses like Bruce Castle (about 1.2 miles north-east) are a reminder that the area around Duckett's Green has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
Schools such as St John Vianney RC Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. In the older streets around Christ Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Duckett's Green is about 3 miles north of Highbury, in Greater London. Homes, rented property, offices and hotels in Duckett's Green can book us for sand mastic. The work is guaranteed for a year. Duckett's Green is one of 764 places in Greater London we cover for sand mastic. London is on our list too, about 6 miles from Duckett's Green.
All of N15, N22 and N8 is within our area for sand mastic, from the main roads to the quietest streets. Local streets include Bury Road, Mark Road and Frome Road, and we cover them all. Duckett's Green is on the A1080, which makes it straightforward to reach. Other places close to Duckett's Green include West Green (1 mile south-east), Harringay (1 mile south), St Ann's (1 mile south-east), Broadwater Farm (1 mile north-east) and Tottenham Green (1 mile east). Larger places within reach include 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).
Local landmarks in Duckett's Green
Typical jobs here are in homes near Moselle Upper School, Ducketts Common and The Queens Head pub. For rail, the closest station is Hornsey station, roughly 0.7 miles west of the centre. Other landmarks nearby include Greentrees Hospital (1.5 miles north) and Markfield Beam Engine and Museum (1.6 miles east). Green spaces nearby include Hollow Pond and Railway Fields.
How the job changes by surface
Brick reveals
Gaps between frame and brick let in rain and draughts. Renewing the mastic closes it.
Timber door frames
Round a period front door, sand mastic gives the right look.
Common questions in Duckett's Green
Do you work for landlords with property near Hornsey station?
Yes, we work for landlords and agents. You can call 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
Is parking an issue for sand mastic in Duckett's Green?
Parking in Duckett's Green, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you offer different sealant colours?
We help you choose a colour that suits, from white and clear to greys and other shades. The product needed can limit the range.
Is it messy?
We keep the work tidy. Nearby surfaces are protected.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
What’s sand mastic made of?
It’s a mix of sand and a linseed-oil-based binder. It’s built up in the joint by hand and shaped to suit the surround.
Do you cover Duckett's Green?
Yes. We cover Duckett's Green and the rest of Greater London, as part of our work across South East England, London and Scotland. To book, phone 0345 464 0079 or email us.
Can I paint the new mastic?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we will advise.
When something else is needed
Sealant isn’t the answer to every problem, and we’ll tell you before we start. It will not solve:
- Sash cords, weights and draught-proofing of the sashes
- Crumbling stone or brickwork round the window
- Whether work needs listed building consent
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly.
Surfaces we seal
- Period & listed homes
- Sash and case windows
- Stone surrounds
- Brick reveals
- Timber door frames
- Tenement windows