Greater London · England
Sand mastic for sash & case windows in Greengate, Greater London
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Greengate and across Greater London. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Tired mastic found when preparing windows for paint
- Cracked mastic round a front door frame
- Gaps between timber frames and stone or brick
Honest limits
It helps to know what we cannot do:
- Broken panes
- Decisions on consent for listed homes
- Damaged stone surrounds
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think.
Joints and surfaces we work on
- Tenement windows
- Period & listed homes
- Brick reveals
- Stone surrounds
- Timber door frames
- Sash and case windows
Sand mastic in Greengate
A silicone bead around a sash window can look out of place and is not always the right material. Sand mastic gives a finish that matches the age of the house, and we can replace one with the other. Common call-outs are for gaps between timber frames and stone or brick and patchy fillers round a sash window, on stone surrounds, timber door frames and tenement windows.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in, in Greengate as anywhere.
You get a one-year guarantee, the same in Greengate as everywhere else we work.
- Location
- Greengate (E13, E6, E16)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Aftercare tips
So the new joints stay in good condition:
- Make sure water runs off the sill
- Don’t paint over the new mastic
- Avoid patching sand mastic with silicone
- Take care around the mastic when scraping paint
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
Once mastic starts to crumble, rain gets in. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
Do you need sand mastic in Greengate?
Over the years, sand mastic weathers. It hardens, cracks and starts to come away from the frame or the masonry.
Signs it’s time to call us include:
- Mastic worn away on windows facing the weather
- Modern sealant on a period surround
- Old sand mastic that has cracked, crumbled or fallen out
- Old cement repairs round a window that have failed
Greengate is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
What to look for in a quote
- The length of the guarantee
- How the surfaces are prepared before sealing
- Which sealant they’ll use, and why
- How hidden problems are handled
Places near Greengate
What else we do in Greengate
Why act early in Greengate
New sash windows are a major, costly change and on a listed home, consent may be needed. Where the frames are in good order, new mastic seals the surround. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Greengate, the repair is bigger than the sealant job would have been.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Ask us for a quote and we will go through it with you.
Why us?
- We leave the area clean and tidy
- A 12-month guarantee on all work
- Experience in homes, commercial sites and hotels
- More than 20 years in sealant work
Read how sealant jobs are priced and customer reviews.
What affects the cost of sand mastic
For a quick quote, just ask. The main things that affect it are:
- Access and height
- When we can work, for business premises
- The size of the job
- The product the joint needs
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first and give you a clear price before we start.
Helping us quote
Before you ask for a quote, have a think about:
- Access, such as stairs, a lift or height
- 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
If you’re in Greengate and need sand mastic, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
What we do, step by step
We keep the work tidy and contained to the area we’re working on, so you can carry on as normal. The job normally takes a few hours per window, depending on the condition of the joints, and we explain the cure time before we leave. In Greengate, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- Let us know about parking restrictions
- Clear the area around the work
- On commercial sites, let us know about site rules
How to get a quote
Getting a quote is simple: tell us what needs doing and where and its rough size. A few photos by email make the job easier to understand, and we’ll take it from there.
Read more
Greengate homes and the weather
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Eastbury Manor House (about 3.1 miles east) are a reminder that the area around Greengate has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
If you live in an older home near St Andrew's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Managing a site like Southern Road Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
Greengate is about 4 miles east of Whitechapel, in Greater London. Our applicators cover sand mastic for homes and businesses in Greengate and nearby. Our Greater London coverage runs to 764 places, and Greengate is one of them. We also work in London, around 6 miles away.
Here we cover the E13, E6 and E16 postcode area for sand mastic. Streets in the area include May Road, Emma Road and Cave Road, and we cover them all. We also cover the places around Greengate: Plaistow (1 mile south-west), Upton Park (1 mile north-east), Upton (1 mile north), West Ham (1 mile north-west) and Canning Town (1 mile south). Further out, we also cover London (6 miles west), City of Westminster (8 miles west), Marylebone (8 miles west), Kensington (10 miles west), St Pancras (6 miles west) and Shoreditch (5 miles west).
Local landmarks in Greengate
Typical jobs here are in homes near Coach And Horses Public House, Lister Community School and West Ham Park, among other places. For rail, the closest station is West Ham station, about 1 mile west of the centre. Well-known places in the area include West Ham United Football Club Museum (0.6 miles north-east) and Stratford Centre (1.5 miles north-west). Not far away are Old Ford Island and Tower Hill.
Common questions in Greengate
Is parking a problem for a job in Greengate?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Do you work for landlords with property near West Ham station?
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 will give you a fixed price before we start.
How long will you be here?
Typically it takes a few hours per window, depending on the condition of the joints. Larger jobs naturally take longer, and we’ll say how long yours will take.
Will the old sealant be removed?
Yes, always, and completely. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Will there be a smell?
Some sealants have a smell while they cure, but it fades. Opening a window helps.
Are you insured?
Yes. We are fully insured for domestic and commercial work.
Will you leave a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
What sealant do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we will explain our choice.
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.