Greater London · England
Sand mastic for sash & case windows in Barbican Estate, Greater London
Sand mastic for Barbican Estate, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Old sand mastic that has cracked, crumbled or fallen out
- Cracked mastic round a front door frame
- Window mastic to renew ahead of painting
Surface by surface
Stone surrounds
Stone surrounds suit sand mastic well. It finishes to look like part of the surround.
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We can do one window or several.
Sand mastic in Barbican Estate
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. Out comes the old, loose mastic, and new mastic is applied and shaped by hand. We work on brick reveals, stone surrounds and sash and case windows, and common reasons people get in touch are mastic round period door frames that has failed and gaps between timber frames and stone or brick.
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 Barbican Estate as anywhere.
The work is covered for a year after we finish. If anything isn’t right with it, call 0345 464 0079 or email us.
- Where
- Barbican Estate (EC1V, EC2A, EC1Y)
- Region
- Greater London
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How it works
When we arrive, we look over the joints with you first. We protect the surfaces around the joints before any work begins. Most jobs take anything from a few hours to a full day, depending on how many windows. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Barbican Estate. It helps if you can point us to a visitor permit or a bay close to the door.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Mention any tricky access
- Let us know about earlier repairs to the joints
- Clear the area around the work
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. Whenever you’re ready, phone 0345 464 0079 or drop us an email.
Read more
DIY versus a professional finish
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.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Why it’s worth doing now in Barbican Estate
Not every filler suits an old window surround. Sand mastic matches what was there and that can be important for listed homes. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble for homes in Barbican Estate.
What it costs depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
Why book with us
- We are fully insured
- Tidy, careful work
- Homes, businesses and hotels
- An ARBOMaster approved applicator
Read our cost guide or our reviews.
What we are called out for in Barbican Estate
Sand mastic slowly weathers. It dries out, cracks and loses its grip on the stone or timber.
If you can see any of these, it’s time to have the joints looked at:
- Old cement repairs round a window that have failed
- Mastic dropping out of the joint
- Mastic that needs renewing before redecorating
- Gaps between timber frames and stone or brick
Barbican Estate is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Before you book anyone
- What the quote includes, VAT included or not
- How long the guarantee is
- Is the old sealant removed completely?
- How the joint is cleaned and prepared
FAQs for Barbican Estate
Is parking an issue for sand mastic in Barbican Estate?
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.
I let a flat near Moorgate station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can phone 0345 464 0079 or email us with the details for a clear quote.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Do you offer different sealant colours?
Yes. White, clear and grey are common, and other colours are available for many products, and we agree the colour with you before work begins.
Is it possible to paint over sand mastic?
Sand mastic is normally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
Do you come to Barbican Estate?
Yes. From our base in Crawley, we cover South East England, London and all of Scotland.
Do you have insurance?
Yes. Mr Mastic is fully insured.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice.
When something else is needed
We’ll always be straight with you, so here’s what new sealant won’t do:
- Putty and glazing repairs
- Decayed frames that need repair
- Crumbling stone or brickwork round the window
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly.
What we seal
- Timber door frames
- Stone surrounds
- Period & listed homes
- Brick reveals
- Sash and case windows
- Tenement windows
Also near Barbican Estate
Other services in Barbican Estate
Keeping the joints in good condition
How long the joints last depends on use and care. We suggest:
- Inspect the joints round the windows every year or so
- Find out about consent before window work on a listed home
- Avoid heavy scraping on the mastic joint
- Keep sills and gutters clear so water drains away
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
Sand mastic in Barbican Estate: local notes
With historic houses such as Mansion House (about 0.5 miles south-east) nearby, there’s older building stock in the area around Barbican Estate as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near St Giles-without-Cripplegate, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Managing a site like Prior Weston Primary School and Children's Centre? Then larger buildings have plenty of frames, and the mastic around each one ages.
Barbican Estate is about 1 mile north of London, in Greater London. We carry out sand mastic for homeowners, landlords and businesses in Barbican Estate. Our area takes in 764 places across Greater London.
Every address in EC1V, EC2A and EC1Y is covered for sand mastic. Sand mastic is available to properties on Oat Lane, Shoe Lane and Long Lane. Being close to the A1 and A40, Barbican Estate is simple for us to get to. If you’re just outside Barbican Estate, we cover Finsbury (1 mile north), City of London (1 mile south), St Luke's (1 mile north), Bishopsgate (1 mile east) and Aldgate (1 mile south-east). Further out, we also cover City of Westminster (3 miles west), Kensington (5 miles west), Walthamstow (6 miles north-east), Hampstead (4 miles north-west), Ruislip (14 miles west) and Brompton (3 miles south-west).
What’s near Barbican Estate
Locally, jobs take us to homes and businesses close to Barbican Conservatory, Central Foundation Boys' School and Barts Health Archives and the streets around them. Other local landmarks include Charterhouse Square School (within half a mile north-west), St Mary-at-Hill (0.8 miles south-east) and The Jugged Hare pub (under half a mile north-east). There’s a railway station in Barbican Estate itself: Moorgate station. Nearby you will also find St Luke's Hospital for Lunatics (0.5 miles north-east) and Gabriel's Wharf (1 mile south-west). Open spaces near Barbican Estate include Barnsbury Wood and St. James's Park Lake.