Greater London · England
Sand mastic for sash & case windows in Three Mills, Greater London
Professional sand mastic in and around Three Mills, with old sealant always removed completely and a 12-month guarantee.
- Gaps round a timber door in stone or brick
- Mastic that needs renewing before redecorating
- Old cement repairs round a window that have failed
Sand mastic in Three Mills
Burnt sand mastic is a traditional material that sits naturally against stone and brick. It’s a good fit for period properties, where modern sealant can look out of place. We work on stone surrounds, period & listed homes and sash and case windows, and people most often call us about open joints round the window box and mastic that needs renewing before redecorating.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease generally says who is responsible for the windows, so it’s worth checking before booking, and access in Three Mills is something to talk through when you book.
The work is covered for a year after we finish. If there’s a problem with it, please ring 0345 464 0079 or drop us an email.
- Place
- Three Mills (E3, E15, E14)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlords, agents and businesses in Three Mills
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we are fully insured.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Different surfaces, different methods
Stone surrounds
Sand mastic sits naturally against stone. It finishes to look like part of the surround.
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
How the visit works
Once we’re on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours per window, depending on the condition of the joints. In Three Mills, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- 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.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
How to prepare
- Clear items away from the joints we are working on
- Mention any tricky access
- Let us know about earlier repairs to the joints
Get a quote
Want a quote for sand mastic? Please call 0345 464 0079 or email us and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Advice
What sealant work can’t fix
A few problems are outside what sealant work can do:
- Sashes that rattle, stick or won’t open
- Planning or listed building consent (your local planning authority decides)
- Broken panes
If in doubt, ring 0345 464 0079 or email us and we will say what we think.
Where we work in Three Mills
- Brick reveals
- Sash and case windows
- Timber door frames
- Stone surrounds
- Period & listed homes
- Tenement windows
What affects the quote in Three Mills
Every job gets its own quote. This is what makes a difference:
- How much there is to do
- How easy the joints are to reach
- The product the joint needs
- When we can work, for business premises
No two jobs are quite the same, 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.
Helping us quote
To help us quote quickly, please include:
- Photos by email, if that is easy
- Where the property is
- If it’s domestic, commercial or a hotel
- If someone has resealed it before
It all starts with a short chat. Describe the problem, the location and the size of the job. When it suits you, call 0345 464 0079 or email us.
How to look after the new joints
So the new joints stay in good condition:
- Sort the mastic before the decorators arrive
- Go gently near the mastic when preparing windows
- Do not run silicone over sand mastic
- Have rotten timber repaired before new mastic goes in
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber, which can lead to rot.
Why act early in Three Mills
Gaps round a sash window let in rain and draughts. Water can get to the frame and the masonry, so dealing with it now protects both. 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.
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or drop us an email.
Why book with us
- Full insurance on every job
- Homes, businesses and hotels
- Every job guaranteed for a year
- 4.9 on Google from 180+ five-star reviews
Three Mills questions
Can you do sand mastic in Three Mills?
Yes, Three Mills is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or email us with a few details of the job.
Is parking a problem for a job in Three Mills?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Is it possible to take out silicone and use sand mastic instead?
Yes. The silicone is cut out and the joint cleaned before the sand mastic goes in.
How long will you be here?
It depends on the size of the job, but as a guide it takes anything from a few hours to a full day, depending on how many windows. We’ll give you a better idea when we quote.
Is consent needed for window work on a listed home?
Check with your local planning authority. They’ll tell you if consent is needed.
What exactly is sand mastic?
A traditional pointing material made from sand and a linseed-oil-based binder, used between timber frames and stone or brick.
I’m a tenant. Can you help?
We’re happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
Is there any odour?
It depends on the product. Some smell for a while, some hardly at all.
Also near Three Mills
Other services in Three Mills
Frames and glazing around Three Mills
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking. With historic houses such as Sutton House (about 2.4 miles north-west) nearby, there’s older building stock in the area around Three Mills as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
As a London address, Three Mills can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. For an older house near a landmark such as St Mary's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you look after a building such as East London Science School, the mastic around its windows and doors needs looking after like any other building’s.
Three Mills is about 1 mile south of Stratford, in Greater London. Whether you are in the middle of Three Mills or further out, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Three Mills is one of 764 places in Greater London we cover.
Jobs for sand mastic in E3, E15 and E14 works the same way as everywhere else we cover. We cover properties on Gay Road, Bruce Road and Edgar Road. If you’re just outside Three Mills, we cover Mill Meads (1 mile north), Bromley (1 mile south-west), Old Ford (1 mile north-west), Bow (1 mile west) and Bow Common (1 mile south-west). Larger places within reach include London (4 miles south-west), City of Westminster (6 miles west), Marylebone (6 miles west), Kensington (9 miles west), St Pancras (5 miles west) and Shoreditch (3 miles west).
Local landmarks in Three Mills
Typical jobs here are in homes near Manorfield Primary School, London International School of Performing Arts and Bob's Park. The nearest railway station is West Ham station, about 0.5 miles east of the centre. A little further out are Stratford Centre (1 mile north) and St Clement's Hospital (0.9 miles west). Green spaces nearby include Hollow Pond and Old Ford Island.