Greater London · England
Sand mastic for sash & case windows in South Wimbledon, Greater London
Sand mastic in South Wimbledon from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Tired mastic found when preparing windows for paint
- A silicone bead on a sash window that spoils the look
- Open joints round the window box
Sand mastic for homes and businesses in South Wimbledon
Traditional burnt sand mastic that sits naturally against stone and brick. It suits period and listed homes where a modern sealant bead would stand out. If you’re dealing with mastic dropping out of the joint and draughts and rain around sash boxes, we can put it right, whatever the surface.
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.
All of our work is guaranteed for twelve months.
- Location
- South Wimbledon (SW19, SW20, SW17)
- Region
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How the visit works
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes anything from a few hours to a full day, depending on how many windows. In South Wimbledon, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
How to prepare
- Tell us about any water getting in
- Plan for the work area to be out of bounds to pets and children
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
For a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We’ll give you a clear quote before any work starts.
Related advice
DIY versus a professional finish
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Windows and doors in South Wimbledon
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
As a London address, South Wimbledon can be tricky for parking: let us know about parking bays, permits or a driveway. Rented homes near Wimbledon station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
South Wimbledon is about 1 mile south-east of Wimbledon, in Greater London. Jobs in South Wimbledon get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our Greater London coverage runs to 764 places, and South Wimbledon is one of them. We also work in London, around 7 miles away.
Every address in SW19, SW20 and SW17 is covered for sand mastic, from the main roads to the quietest streets. Whether your property is on Gap Road, Mina Road and York Road or anywhere close by, we can help. If you’re just outside South Wimbledon, we cover Merton (1 mile south-east), Merton Abbey (1 mile south-east), Summerstown (1 mile north-east), Colliers Wood (1 mile east) and Tooting Bec (1 mile north-east). Further out, we also cover London (7 miles north-east), City of Westminster (7 miles north), Marylebone (7 miles north), Kensington (6 miles north), St Pancras (8 miles north-east) and Shoreditch (9 miles north-east).
What’s near South Wimbledon
We work in homes and buildings around Wimbledon High School, Wibbas Down Inn and Willington School and the streets around them. There’s a railway station in South Wimbledon itself: Wimbledon station. Other landmarks nearby include Southside Wandsworth (2.4 miles north) and Wimbledon Museum (0.9 miles west). The countryside around South Wimbledon includes Battersea Park Lake and Merton Park Green Walks.
What happens if it’s left?
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic suits the building and finishes neatly against the masonry. In a flat in South Wimbledon, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why book with us
- Arbo and Everbuild products
- Experience in homes, commercial sites and hotels
- Fully insured
- Every job guaranteed for a year
Do you need sand mastic in South Wimbledon?
Scraping and sanding before painting can loosen old mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
People generally contact us when they notice something like this:
- Draughty sash windows at the surround
- Weathered mastic on the most exposed windows
- Crumbling sand mastic round a window
- Patchy fillers round a sash window
For an older house near a landmark such as Holy Trinity, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Before booking anyone
- Who does the work, and how experienced they are
- Whether they’re fully insured
- Whether they seal over old material or remove it
- How hidden problems are handled
How we quote for sand mastic
You will get a clear quote before we start. It takes into account:
- How easy the joints are to reach
- How much there is to do
- How many rooms, windows or areas are involved
- When we can work, for business premises
What you pay reflects the work, not guesswork. That’s why we ask a few questions first and agree the price before starting.
What to tell us for a quote
To help us quote quickly, please include:
- Any previous sealing or DIY work
- Whether it’s a home or a business
- Any access issues, like height or stairs
- Where the property is
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Surface by surface
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. Sand mastic seals the joint round it.
Tenement and terrace windows
Upper-floor windows need access planning. Tell us the height and we’ll confirm what’s needed.
When something else is needed
Sealant isn’t the answer to every problem, and we’ll tell you before work begins. It will not solve:
- Masonry that needs repairing
- Putty and glazing repairs
- Decayed frames that need repair
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think.
What we seal
- Period & listed homes
- Brick reveals
- Timber door frames
- Sash and case windows
- Stone surrounds
- Tenement windows
Your questions about sand mastic in South Wimbledon
Can you help a landlord with a rental near Wimbledon station?
Yes, we work for letting agents and landlords. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear price.
Do you cover South Wimbledon for sand mastic?
Yes, South Wimbledon is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or drop us an email and tell us what needs doing.
What exactly is sand mastic?
It’s sand mixed with a linseed-oil-based binder, used between timber frames and stone or brick.
Are you insured?
Yes. We’re fully insured for domestic and commercial work.
What does sand mastic cost?
Every job is different, so each one gets its own quote. To get one, call 0345 464 0079 or send us an email with a short description of the job.
Will the old sealant be removed?
Yes, every time. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
Is it messy?
We keep the work tidy. Nearby surfaces are protected, and we clear up when we’re done.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover South Wimbledon, along with the rest of our area.