Greater London · England
Sand mastic for sash & case windows in Bethnal Green, Greater London
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Bethnal Green, backed by a 12-month guarantee. Call for a quick quote.
- Silicone on a period window that looks wrong
- Window mastic to renew ahead of painting
- Old sand mastic that has cracked, crumbled or fallen out
How we handle sand mastic in Bethnal Green
We work across Bethnal Green renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand, finished to suit the masonry. Common call-outs are for patchy fillers round a sash window and weathered mastic on the most exposed windows, across stone surrounds, period & listed homes and brick reveals.
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 Bethnal Green as anywhere.
Whatever the size of the job, it’s backed by our 12-month guarantee.
- Location
- Bethnal Green (E2, E1, E3)
- Region
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in Bethnal Green
Do you work for landlords with property near Cambridge Heath station?
Yes. We work for letting agents and landlords as well as homeowners. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
Do you cover Bethnal Green for sand mastic?
Yes, Bethnal Green is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
What does sand mastic cost?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before any work starts.
Do you do commercial work?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
Which is right for my windows, sand mastic or modern sealant?
Sand mastic generally suits period timber windows best. On modern frames, we’d normally use a flexible sealant, and we will explain why.
What sealant do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we will explain our choice.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you don’t need to watch us work.
Also near Bethnal Green
What else we do in Bethnal Green
The process
Every visit runs the same way: we look at the joints together, protect the area around them, carry out the job and clear up. Most jobs take a few hours per window, depending on the condition of the joints. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Bethnal Green. It helps if you can point us to a visitor permit or a bay close to the door.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Mention any sign-in or site rules at work premises
- Tell us if parking is tricky
Getting a quote
For a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. We’ll give you a clear price before any work starts.
Related advice
Looking after it afterwards
Good habits help new joints last longer. A few tips:
- Do not paint over the new mastic
- Keep sills and gutters clear so water drains away
- Keep modern sealant off the mastic
- Check with your local planning authority if your home is listed
Leave the new mastic alone while it firms up. It forms a skin fairly soon but needs longer to fully harden.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens as more mastic falls out.
Honest limits
Sealant isn’t the answer to every problem, and we’d rather say so up front. It won’t solve:
- Sash cords, weights and draught-proofing of the sashes
- Cracked or broken glass
- Planning or listed building consent (your local planning authority decides)
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Stone surrounds
- Period & listed homes
- Sash and case windows
- Brick reveals
- Tenement windows
- Timber door frames
What sand mastic looks like in Bethnal Green
In London conversions and blocks, the lease decides who is responsible for the frames, 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.
In the older streets around St Peter's, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Letting a property close to Cambridge Heath station? Then any sash windows need sound mastic to keep draughts and rain out. For site and facilities teams at buildings such as Lawdale Junior School, its window and door frames need their mastic kept sound, just like a home’s.
Bethnal Green is about 3 miles north-east of London, in Greater London. We carry out sand mastic for homes and businesses in Bethnal Green, as part of our work across Greater London. Bethnal Green is one of 764 places in Greater London we cover for sand mastic.
Every address in E2, E1 and E3 is within our area for sand mastic. Local streets include Patriot Square, Ion Square and Victoria Park Square, all of which we cover. Bethnal Green is on the B108 and B118, which makes it straightforward to reach. If you’re just outside Bethnal Green, we cover Cambridge Heath (1 mile north-east), London Fields (1 mile north), Shoreditch (1 mile west), Haggerston (1 mile north-west) and Stepney (1 mile south-east). Within a short drive, we also cover London (3 miles south-west), City of Westminster (4 miles west), Marylebone (4 miles west), Kensington (6 miles west), Walthamstow (4 miles north) and Hampstead (5 miles west).
What’s near Bethnal Green
Locally, jobs take us to homes and businesses close to Oaklands School, Bishopsgate Institute Special Collections and Archives and Bethnal Green Gardens. Other local landmarks include Young and Talented School of Stage and Screen (less than half a mile south) and Sebright Arms (less than half a mile north-west). Bethnal Green has its own railway station: Cambridge Heath station. Nearby you will also find Hackney Walk (1.3 miles north) and London Chest Hospital (0.5 miles east). The countryside around Bethnal Green includes St. James's Park Lake and Tower Hill.
What the job involves on each surface
Timber door frames
Period doors in stone or brick openings are often pointed with sand mastic. The method is the same as for windows.
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. We shape it by hand to follow the stone.
Leave it or put it right?
A silicone bead can be quicker, but on period stone or brick it often looks out of place. Sand mastic suits the building and blends with the stone or brick. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
A failed joint rarely gets cheaper to fix by waiting. If you are not sure whether it needs doing, call 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
Why choose Mr Mastic in Bethnal Green
- Old sealant always removed completely
- 12-month guarantee on every job
- 20+ years of sealant experience
- An ARBOMaster approved applicator
Take a look at our cost guide or our reviews.
Should I try it myself first?
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
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.
For landlords and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.