Greater London · England
Bankside Sand Mastic
Professional sand mastic in and around Bankside, with every bit of old sealant taken out first and a 12-month guarantee.
- Tired mastic found when preparing windows for paint
- Modern sealant on a period surround
- Open joints round the window box
Signs you need sand mastic in Bankside
Timber swells and shrinks with the weather. That movement opens up the mastic joint little by little.
Most people get in touch after spotting something like this:
- Mastic round period door frames that has failed
- Mastic that needs renewing before redecorating
- Crumbling sand mastic round a window
- Draughts and rain around sash boxes
If you look after a building such as London Nautical School, larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- Whether you can choose the colour
- Whether all the old sealant comes out first
- Whether the sealant suits the joint
- What the quote includes, VAT included or not
Sand mastic in Bankside
Silicone on a period window often looks wrong and isn’t always the right material. Sand mastic is the traditional choice, and we can replace one with the other. If you have silicone on a period window that looks wrong and wind and rain getting in round a sash window, we can help, whatever the surface.
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.
You get a one-year guarantee, the same in Bankside as everywhere else we work.
- Location
- Bankside (SE1, EC4Y, EC4V)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
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 fails, we can still redo it.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Common questions in Bankside
Can parking be tricky for a visit in Bankside?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Do you work for landlords with property near London Blackfriars station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear quote.
What should I tell you?
Just the basics: where it is, what you’ve noticed and how we reach it. Then ring 0345 464 0079 or send us an email.
Do you take out the old sealant first?
Always. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Can you do several jobs on one visit?
Yes. Just list everything you need and you’ll get one quote.
Is there any odour?
There can be a smell while the sealant cures. Opening a window helps.
How long does sand mastic take to go off?
It takes a while. The skin forms first, and the full set comes later and we’ll give you an idea for your job.
Are you an approved applicator?
Yes. We’re an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Quotes for sand mastic in Bankside
There’s no set price list. The quote depends on:
- The product the joint needs
- How much there is to do
- Whether old sealant or filler has to be cut out
- Working hours on commercial sites
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Helping us quote
There’s no need for technical detail. Just tell us:
- Whether it has been sealed before
- Whether it’s a home or a business
- How many joints, rooms or windows are involved
- A few pictures by email, if you can
Want a quote for sand mastic? Please phone 0345 464 0079 or email us and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
How it works
The work is kept neat and contained to the area we’re working on. The job normally takes a few hours per window, depending on the condition of the joints. In Bankside, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
How to prepare
- Tell us if parking is tricky
- Clear items away from the joints we’re working on
- On commercial sites, let us know about site rules
Ask for a quote
To get a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Related advice
Different surfaces, different methods
Timber door frames
Period doors in stone or brick openings are often pointed with sand mastic. We renew it the same way as on windows.
Sash and case windows
Sash windows are where we do most sand mastic work. We renew the mastic round each box.
Nearby places to Bankside
More services for Bankside
Looking after it afterwards
How long the joints last depends on use and care. Here’s what we suggest:
- Inspect the joints round the windows every year or so
- Plan mastic work ahead of painting
- Ask the planning authority about consent for listed or conservation-area homes
- Take care around the mastic when scraping paint
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens.
Bankside homes and the weather
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. With historic houses such as Mansion House (about 0.6 miles north-east) nearby, there’s older building stock in the area around Bankside as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
As a London address, Bankside can be tricky for parking: let us know about parking bays, permits or a driveway. Homes close to St Mary Mounthaw include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Bankside is about 1 mile north of London, in Greater London. Whether you are in the middle of Bankside or further out, we cover sand mastic for every kind of property. Across Greater London, we cover 764 places, and Bankside is one of them.
Postcode districts we cover here for sand mastic: SE1, EC4Y and EC4V. Whether your property is on Bear Lane, Bush Lane and Swan Lane or a nearby road, our applicators can take on the job. With the A201 and A300 close by, Bankside is simple for us to get to for sand mastic. We also cover Blackfriars (1 mile north-west), Temple (1 mile north-west), Temple Bar (1 mile north-west), Waterloo (1 mile south-west) and Smithfield (1 mile north). We also work in nearby towns such as Kensington (4 miles west), Walthamstow (6 miles north-east), Hampstead (5 miles north-west), Ruislip (14 miles west), Brompton (3 miles west) and Stockwell (3 miles south).
Around Bankside
Typical jobs here are in homes near St Mary-at-Hill, Bernie Spain Gardens and St Andrew's and St John's Church of England Primary School, among other places. Other local landmarks include Barts Health Archives (0.6 miles north), The Cathedral School of St Saviour and St Mary Overy (0.5 miles south-east) and Founders Arms (under half a mile west). Bankside has its own railway station: London Blackfriars station. Nearby you’ll also find Royal Waterloo Hospital for Children and Women (0.6 miles west) and Gabriel's Wharf (within half a mile west). Green spaces nearby include Ludgate Hill and Barnsbury Wood.
When it isn’t the sealant
New sealant cannot fix everything, and we’ll tell you before any work starts. Sealant won’t put right:
- Decayed frames that need repair
- Cracked or broken glass
- Planning or listed building consent (your local planning authority decides)
If you’re not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer before booking.
What we seal
- Tenement windows
- Sash and case windows
- Brick reveals
- Period & listed homes
- Timber door frames
- Stone surrounds