Greater London · England
South Bermondsey Sand Mastic
Sand mastic for South Bermondsey and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Mastic that needs renewing before redecorating
- Old sand mastic that has cracked, crumbled or fallen out
- Mastic worn away on windows facing the weather
Sand mastic in South Bermondsey, done properly
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s a mix of sand and a linseed-oil-based binder, applied by hand. On older homes, it suits the building far better than silicone. Typical jobs include failed mastic on an exposed elevation and old cement repairs round a window that have failed, on sash and case windows, timber door frames and tenement windows.
Many London homes are flats, with windows high above the street. Who looks after the outside of the frames can depend on the lease, so check that first, and access in South Bermondsey is something to talk through when you book.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or drop us an email.
- Location
- South Bermondsey (SE16, SE15, SE1)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Leave it or put it right?
Draughts round a sash window aren’t always the sashes. Open mastic joints round the box can let air in, and renewing the mastic closes them. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we will go through it with you.
Why us?
- Approved under the ARBOMaster scheme
- Neat joints and a tidy finish
- 20+ years of sealant experience
- Homes, businesses and hotels
Read what affects the cost or our reviews.
When to call us in South Bermondsey
Water gets into small cracks in the mastic and pushes it out. Exposed elevations normally fail first.
Most people get in touch after spotting one of these:
- Gaps round a timber door in stone or brick
- Mastic dropping out of the joint
- Draughts and rain around sash boxes
- Cement or filler used on old window joints that has cracked
For site and facilities teams at buildings such as Ilderton Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Questions to ask before booking
- Whether they seal over old material or remove it
- How much experience the applicator has
- What insurance they hold
- What happens if the job turns out different
What we do, step by step
Most of a good job is in the preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes 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 South Bermondsey. A visitor permit or a nearby bay makes the visit run more smoothly.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any water getting in
- Move anything stored near the joints
How to get a quote
Getting a quote is simple: let us know what needs doing and where. A few pictures by email make the job easier to understand, and we’ll take it from there.
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Also near South Bermondsey
Other services in South Bermondsey
Keeping the joints in good condition
Looking after new joints is easy, and it makes a real difference:
- Go gently near the mastic when preparing windows
- Ask a joiner to look at soft timber first
- Ask the planning authority about consent for listed or conservation-area homes
- Sort the mastic before the decorators arrive
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger as more mastic falls out.
Questions from South Bermondsey
Do you cover South Bermondsey for sand mastic?
Yes. We work across London and the South East, and South Bermondsey is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear quote.
Can parking be tricky for a visit in South Bermondsey?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Where are you based?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we’ll tell you what we are using.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you do not need to watch us work.
Do I need permission for sand mastic on a listed building?
Speak to your local planning authority before work starts. Sand mastic is often favoured as like for like, but they decide.
How long does sand mastic take to harden?
It takes a while. The skin forms first, and the full set comes later, and we will tell you what to expect.
Should I use sand mastic or silicone?
Sand mastic usually suits period timber windows best. On modern frames, we’d normally use a flexible sealant, and we will explain why.
DIY versus a professional finish
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.
If you are 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 does not work out, we can still put it right.
What affects the quote in South Bermondsey
There’s no set price list. The quote depends on:
- Whether there’s mould to deal with
- The size of the job
- Working hours on commercial sites
- Whether the work is at height
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Helping us quote
When you contact us, it’s useful to know:
- The type of property
- Where the job is, and your postcode
- Whether it has been sealed before
- The rough size of the job
Every job is quoted individually, so the first step is telling us about yours. Simply ring 0345 464 0079 or drop us an email and describe the job, and pictures are welcome.
Sand mastic in South Bermondsey: local notes
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 a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
South Bermondsey is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Homes close to Church of St Augustine include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
South Bermondsey is about 2 miles north-west of New Cross, in Greater London. From the centre of South Bermondsey to the outskirts, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. South Bermondsey is one of 764 places in Greater London we cover.
Jobs for sand mastic in SE16, SE15 and SE1 works the same way as everywhere else we cover. Whether your property is on Tenda Road, Rolls Road and Simms Road or a nearby road, we can help. With the A2208 close by, South Bermondsey is simple for us to get to. If you’re just outside South Bermondsey, we cover Surrey Canal (1 mile east), Surrey Quays (1 mile north-east), Bermondsey (1 mile north-west), Peckham (1 mile south) and Rotherhithe (1 mile north-east). Larger places within reach include City of Westminster (4 miles north-west), Marylebone (4 miles north-west), Kensington (6 miles west), St Pancras (4 miles north-west), Shoreditch (3 miles north) and Walthamstow (7 miles north).
What’s near South Bermondsey
Typical jobs here are in homes near The Kentish Drovers Public House, Paterson Park and City of London Academy, among other places. There’s a railway station in South Bermondsey itself: South Bermondsey station. Other landmarks nearby include New Cross Hospital (0.6 miles south-east) and Surrey Quays Shopping Centre (0.8 miles north-east). Green spaces nearby include St. James's Park Lake and Tower Hill.
What the job involves on each surface
Tenement and terrace windows
Windows above ground floor need the right access. Let us know the floor and we’ll confirm access.
Sash and case windows
On a sash window, the mastic joint shows on the outside, so a neat, even finish matters.