Greater London · England
Sand mastic for sash & case windows in South Norwood, Greater London
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in South Norwood, with a 12-month guarantee on every job. Call for a quick quote.
- Wind and rain getting in round a sash window
- Weathered mastic on the most exposed windows
- Mastic that needs renewing before redecorating
How we handle sand mastic in South Norwood
We renew sand mastic around sash windows and doors in stone and brick. The old mastic is raked out, and new mastic is applied and shaped by hand. Common call-outs are for tired mastic found when preparing windows for paint and modern sealant on a period surround, across tenement windows, brick reveals and sash and case windows.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
Every job comes with a 12-month guarantee.
- Location
- South Norwood (SE25, SE20, CR0)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
South Norwood homes and the weather
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Kingswood House (about 2.2 miles north) are a reminder that the area around South Norwood 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.
In the older streets around Church of St Mark, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Schools such as St Mark's Church of England Primary Academy are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
South Norwood is about 5 miles south-east of Stockwell, in Greater London. Across the SE25 area, we cover sand mastic for homes and businesses. Our Greater London coverage runs to 764 places, South Norwood among them. We also work in London, around 7 miles away.
Here we cover the SE25, SE20 and CR0 postcode area for sand mastic. That includes homes and businesses on Park Road, Court Road and Dixon Road and the roads around them. Main roads around South Norwood include the A213. Neighbouring places we cover for sand mastic include Selhurst (1 mile north), Woodside (1 mile south), Ashburton (1 mile south), Elmers End (1 mile east) and Addiscombe (1 mile south). We also work in nearby towns such as London (7 miles north), City of Westminster (9 miles north-west), Marylebone (9 miles north), Kensington (9 miles north-west), St Pancras (9 miles north) and Shoreditch (9 miles north).
Landmarks near South Norwood
Around South Norwood, our work takes us to homes and buildings near The Albion pub, South Norwood Recreation Ground and Harris Academy South Norwood, among other places. South Norwood has its own railway station: Norwood Junction station. Other landmarks nearby include Croydon University Hospital (1.7 miles south-west) and Crystal Palace Museum (1.4 miles north). Not far away are Dulwich Upper Wood and Duppas Hill.
How the visit works
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take a few hours per window, depending on the condition of the joints. In a London area like South Norwood, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- 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.
Preparing for the visit
- Tell us if parking is tricky
- Mention any tricky access
- For business premises, tell us about site rules or sign-in
Get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. Whenever you’re ready, phone 0345 464 0079 or email us.
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What affects the cost of sand mastic
You will get a clear quote before any work starts. It’s based on:
- How much old sealant there is and how hard it is to remove
- Whether there’s mould to deal with
- How easy the joints are to reach
- The number of rooms or windows
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Helping us quote
Before you ask for a quote, have a think about:
- Whether it’s a home or a business
- The rough size of the job
- What’s wrong with the joints now
- Pictures of the joints, sent by email
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.
Common problems we fix in South Norwood
Timber swells and shrinks with the weather. That movement opens up the mastic joint over time.
These are the problems we’re asked about most:
- Mastic worn away on windows facing the weather
- Old sand mastic that has cracked, crumbled or fallen out
- A silicone bead on a sash window that spoils the look
- Wind and rain getting in round a sash window
South Norwood is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
What to look for in a quote
- What preparation is included
- What the quote includes, VAT included or not
- Whether you can choose the colour
- How much experience the applicator has
South Norwood: your questions answered
Is parking a problem for a job in South Norwood?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Do you cover South Norwood for sand mastic?
Yes. Our work covers London and the South East, and South Norwood is part of that. Just call 0345 464 0079 or email us with a few details of the job, and we will give you a clear price.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
I rent my home. Can I book you?
Yes, though it’s best to check with your landlord first. Many landlords are glad to have it sorted.
Can old silicone round a sash window be swapped for sand mastic?
Usually, yes. With the silicone removed and the joint cleaned we point it with sand mastic.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
How long does sand mastic take?
Most jobs take a few hours per window, depending on the condition of the joints, including the preparation. We’ll confirm how long when we quote.
Should I check with the council before work on a listed or conservation-area home?
Speak to your local planning authority before work starts. Sand mastic is often favoured as like for like but the decision is theirs.
When it isn’t the sealant
A few problems are outside what sealant work can do:
- Putty and glazing repairs
- Crumbling stone or brickwork round the window
- Rotten sashes, sills or window boxes (a joiner’s job)
If you are not sure, just call 0345 464 0079 or email us and we will give you a straight answer before booking.
Where we work in South Norwood
- Period & listed homes
- Tenement windows
- Timber door frames
- Sash and case windows
- Stone surrounds
- Brick reveals
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Ask us before painting near the mastic
- Have rotten timber repaired before new mastic goes in
- Keep modern sealant off the mastic
- Plan mastic work ahead of painting
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Sound mastic protects the frame. Failed mastic lets water reach the timber, which can lead to rot.
Surface by surface
Timber door frames
Doors face weather and wear and the mastic can crack early. We rake it out and renew it.
Brick reveals
We rake out the old mastic and pack deep voids before pointing.