Greater London · England
Sand mastic for sash & case windows in Woodcote Green, Greater London
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Woodcote Green and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Mastic dropping out of the joint
- Cracked mastic round a front door frame
- Draughty sash windows at the surround
What we cannot put right
A few problems are outside what sealant work can do:
- Masonry that needs repairing
- Sashes that rattle, stick or won’t open
- Whether work needs listed building consent
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly.
What we seal
- Sash and case windows
- Brick reveals
- Period & listed homes
- Tenement windows
- Timber door frames
- Stone surrounds
How we handle sand mastic in Woodcote Green
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant and we will explain which is best for yours. We are often asked to deal with crumbling sand mastic round a window and old cement repairs round a window that have failed, across tenement windows, sash and case windows and timber door frames.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in Woodcote Green.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Woodcote Green (CR8, SM6, SM5)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Woodcote Green questions
Is parking an issue for sand mastic in Woodcote Green?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you work for landlords with property near Reedham (London) station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.
Is it possible to take out silicone and use sand mastic instead?
In most cases. The silicone is cut out and the joint cleaned, then point it with sand mastic.
How long will you be here?
Typically it takes anything from a few hours to a full day, depending on how many windows. Bigger jobs take longer.
Are you ARBOMaster approved?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Where is Mr Mastic based?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Do I need permission for sand mastic on a listed building?
Yes, it’s worth checking. Your local planning authority can say if consent is needed for listed or conservation-area properties.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned.
Also near Woodcote Green
What else we do in Woodcote Green
How the visit works
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, the area is protected and the work begins. It normally takes anything from a few hours to a full day, depending on how many windows. For a job in Woodcote Green, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Getting ready for the visit
- Let us know about parking restrictions
- Tell us about any water getting in
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work and give you a clear price.
Read more
Woodcote Green homes and the weather
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. Historic houses like Nonsuch Mansion (about 3.6 miles west) are a reminder that the area around Woodcote Green has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you look after a building such as Wallington High School for Girls, larger buildings have plenty of frames, and the mastic around each one ages. Homes close to St. Patrick's Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Woodcote Green is about 1 mile west of Purley, in Greater London. For sand mastic in and around Woodcote Green, please phone 0345 464 0079 or email us for a quick quote. We’re based in Crawley and cover Greater London. Woodcote Green is one of 764 towns and villages in Greater London where we work. There’s also a page for London, about 11 miles away.
Here we cover the CR8, SM6 and SM5 postcode area for sand mastic. You will find streets such as Farm Lane, Elton Road and Green Lane, and we cover them all. Nearby, we also carry out sand mastic in Little Woodcote (1 mile west), Woodcote (1 mile south-east), Peaks Hill (1 mile east), Roundshaw (1 mile north-east) and Russell Hill (1 mile north-east). Larger places within reach include London (11 miles north), City of Westminster (12 miles north), Marylebone (12 miles north), Kensington (11 miles north), St Pancras (13 miles north) and Shoreditch (13 miles north).
Around Woodcote Green
Locally, jobs take us to homes and businesses close to Laleham Lea School, Carshalton Park and Woodcote Primary School and the streets around them. The nearest railway station is Reedham (London) station, roughly 1.3 miles south-east of the centre. A little further out are St George's Walk (3.2 miles north-east) and Croydon Airport Visitor Centre (1.8 miles north-east). The countryside around Woodcote Green includes Roundshaw Downs and Duppas Hill.
Why it’s worth doing now in Woodcote Green
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. Converted houses in London often have a bathroom above someone else’s living room, 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 Woodcote Green.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Why Woodcote Green clients choose us
- Homes, businesses and hotels
- Approved under the ARBOMaster scheme
- Neat joints and a tidy finish
- Arbo and Everbuild products
Take a look at how sealant jobs are priced and customer reviews.
Do you need sand mastic in Woodcote Green?
Age is the main cause. Even well-laid mastic needs renewing in time, depending on exposure and upkeep.
The problems people usually mention when they call include:
- Mastic dropping out of the joint
- Silicone on a period window that looks wrong
- Tired mastic found when preparing windows for paint
- Draughty sash windows at the surround
For landlords with property near Reedham (London) station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Questions to ask before booking
- Who does the work, and how experienced they are
- How hidden problems are handled
- Whether you can choose the colour
- What product goes in the joint
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 the joint depth matters as much as the finish.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
What affects the quote in Woodcote Green
Call for a quick quote. The main things that affect it are:
- Whether the work is at height
- The old material and how stubborn it is
- Which sealant suits the joint
- Any mould that needs treating
A failed joint rarely gets cheaper to fix by waiting. If you’re not sure whether it needs doing, phone 0345 464 0079 or email us for an honest opinion and a quote.
What we need to know
When you contact us, it’s useful to know:
- A few pictures by email, if you can
- If someone has resealed it before
- The type of property
- What’s wrong with the joints now
Need a quote? Please call 0345 464 0079 or drop us an email with a few details. We will explain what we’d do and give you a clear quote before any work starts.
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Avoid heavy scraping on the mastic joint
- Clear gutters so water doesn’t pour onto the windows
- Do not run silicone over sand mastic
- Plan mastic work ahead of painting
Leave the new mastic unpainted, which is the traditional advice. Ask us before any decorating around it.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens as more mastic falls out.