Greater London · England
Sand Mastic in South Bank
Specialist sand mastic for South Bank: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Patchy fillers round a sash window
- Gaps where the frame meets the masonry
- Window mastic to renew ahead of painting
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Renew mastic before redecorating the windows
- Ask us before painting near the mastic
- Ask the planning authority about consent for listed or conservation-area homes
- Clear gutters so water does not pour onto the windows
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
Sand mastic in South Bank
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. We work on brick reveals, timber door frames and stone surrounds, and people most often call us about failed mastic on an exposed elevation and tired mastic found when preparing windows for paint.
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 South Bank as anywhere.
All our work is covered by our one-year guarantee, wherever you are in Greater London.
- Place
- South Bank (SE1, WC2E, WC2N)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Honest limits
New sealant can’t fix everything, and we’d rather say so up front. Sealant won’t put right:
- Sash cords, weights and draught-proofing of the sashes
- Broken panes
- Whether work needs listed building consent
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before you book.
Joints and surfaces we work on
- Brick reveals
- Stone surrounds
- Period & listed homes
- Tenement windows
- Sash and case windows
- Timber door frames
DIY versus a professional finish
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
Work for landlords, hotels and businesses
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
We work for landlords and letting agents as well as householders. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
How the visit works
On the day, there’s very little for you to do. Show us the job and we will take it from there. The job generally takes anything from a few hours to a full day, depending on how many windows from start to finish. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- We start by checking each surround and agreeing the joints to renew.
- We rake out the old mastic and clean the joint.
- 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 mastic is finished to sit tidily against the stone or brick.
Before we arrive
- Keep children and pets away from the work area
- Tell us if parking is tricky
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
Need a quote? Please phone 0345 464 0079 or send us an email and tell us about the job. We will explain what we’d do and give you a clear quote before we start.
Read more
Windows and doors in South Bank
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 Benjamin Franklin House (about 0.4 miles north-west) are a reminder that the area around South Bank has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Rented homes near London Waterloo station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out. Homes close to St John's Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Managing a site like Oasis Academy Johanna? Then its window and door frames need their mastic kept sound, just like a home’s.
South Bank is about 1 mile west of London, in Greater London. Jobs in South Bank get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. 764 places in Greater London are on our list.
All of SE1, WC2E and WC2N is within our area for sand mastic, from the main roads to the quietest streets. If you need sand mastic at a property on York Road, Spur Road and Lower Road or a nearby road, we can help. Being close to the A301 and A302, South Bank is simple for us to get to for sand mastic. Other places close to South Bank include Waterloo (1 mile south-east), Adelphi (1 mile north-west), Charing Cross (1 mile north-west), Temple (1 mile north-east) and Aldwych (1 mile north). Within a short drive, we also cover Kensington (4 miles west), Walthamstow (7 miles north-east), Hampstead (4 miles north-west), Ruislip (14 miles west), Stockwell (3 miles south) and Orpington (13 miles south-east).
Around South Bank
Typical jobs here are in homes near Jubilee Gardens, The Hole In The Wall pub and The BFI Reuben Library, among other places. You’ll also find St Andrew's and St John's Church of England Primary School (within half a mile east) and London Nautical School (under half a mile north-east). There’s a railway station in South Bank itself: London Waterloo station. Well-known places in the area include Florence Nightingale Museum (within half a mile south) and Royal Waterloo Hospital for Children and Women (less than half a mile north-east). Not far away are Barnsbury Wood and St. James's Park Lake.
Your questions about sand mastic in South Bank
Do you cover South Bank for sand mastic?
Yes, South Bank is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Do you work for landlords with property near London Waterloo station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Where are you based?
Our base is Crawley. Our area covers South East England, London and Scotland.
What’s sand mastic made of?
It’s the traditional filler for the joint round timber windows and doors. It combines sand with a linseed-oil-based binder.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Do you offer different sealant colours?
Generally, yes. White, clear and grey are common, and other colours are available, and we agree the colour with you before any work starts.
Can I do it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Do you have insurance?
Yes, we are fully insured.
Towns and villages near South Bank
More services for South Bank
Quotes for sand mastic in South Bank
The quote reflects the job in front of us. We look at:
- How much old sealant there is and how hard it is to remove
- Any working-time requirements on site
- The type of sealant required
- The number and length of the joints
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or drop us an email and we will talk you through it.
Helping us quote
Photos help, but a description is a good start. Please mention:
- A few pictures by email, if you can
- Whether it has been sealed before
- Whether it’s a home or a business
- Where the property is
We quote each job on its own. Just call 0345 464 0079 or drop us an email with the details and send pictures if you have them.
Why it’s worth doing now in South Bank
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, 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.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
Why choose Mr Mastic in South Bank
- We leave the area clean and tidy
- Approved under the ARBOMaster scheme
- We’re fully insured
- Every job guaranteed for a year
See how sealant jobs are priced and our reviews.