Greater London · England
Sand mastic for sash & case windows in South Street, Greater London
We cover South Street for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and a one-year guarantee.
- Draughty sash windows at the surround
- Mastic dropping out of the joint
- Mastic worn away on windows facing the weather
How we handle sand mastic in South Street
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant and we’ll explain which is best for yours. We work on stone surrounds, brick reveals and period & listed homes, and people most often call us about mastic that needs renewing before redecorating and mastic dropping out of the joint.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease normally says who is responsible for the windows, so it’s worth checking before booking, and access in South Street is something to talk through when you book.
There’s a 12-month guarantee on every job.
- Place
- South Street (TN16)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
When something else is needed
It helps to know what we can’t do:
- Decayed frames that need repair
- Damaged stone surrounds
- Planning or listed building consent (your local planning authority decides)
Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly.
Surfaces we seal
- Stone surrounds
- Brick reveals
- Timber door frames
- Tenement windows
- Period & listed homes
- Sash and case windows
Windows and doors in South Street
In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking. Historic houses like Titsey Place (about 2.1 miles south-west) are a reminder that the area around South Street has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Rented homes near Oxted station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about. As a London address, South Street can be tricky for parking: let us know about parking bays, permits or a driveway.
South Street is about 4 miles north-east of Oxted, in Greater London. From the centre of South Street to the outskirts, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Across Greater London, we cover 764 places, South Street among them. There’s also a page for London, roughly 15 miles from South Street.
All of TN16 is covered for sand mastic. Close by, we work in Tatsfield (1 mile west), Force Green (2 miles south-east), Titsey (2 miles south-west), Westerham (2 miles south-east) and Moorhouse Bank (3 miles south). Larger places within reach include London (15 miles north-west), Stockwell (14 miles north-west), Orpington (6 miles north), Wimbledon (14 miles north-west), Kennington (15 miles north-west) and New Cross (13 miles north).
Around South Street
For rail, the closest station is Oxted station, roughly 3.7 miles south-west. Well-known places in the area include Tandridge Priory (3.2 miles south). The countryside around South Street includes West Kent Golf Course nature reserve and Betsom's Hill.
Aftercare tips
After the cure time, these simple habits help:
- Ask a joiner to look at soft timber first
- Check with your local planning authority if your home is listed
- Go gently near the mastic when preparing windows
- Avoid patching sand mastic with silicone
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
Once mastic starts to crumble, rain gets in. It can soak into the frame and the surrounding masonry so early renewal protects both.
Landlord and commercial work in South Street
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
How the visit works
A visit follows a simple pattern: we check the joints, protect the area around them, carry out the job and clear up. It usually takes a few hours per window, depending on the condition of the joints. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
How to prepare
- Clear items away from the joints we’re working on
- Tell us if parking is tricky
- Tell us about any water getting in
Ask for a quote
To get a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We will send you a clear quote before any work starts.
Related advice
How the job changes by surface
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We work on single windows or whole elevations.
Stone surrounds
We take care not to mark the stone when the old mastic comes out.
FAQs for South Street
Is South Street in your area for sand mastic?
Yes. Our work covers London and the South East, and South Street is part of that. Just call 0345 464 0079 or email us with a few details of the job.
I let a flat near Oxted station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
How long will you be here?
A typical job takes anything from a few hours to a full day, depending on how many windows. Your quote will say how long we expect yours to take.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We explain the product when we quote.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned.
Where do you work from?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Do you guarantee sand mastic work?
Our 12-month guarantee applies on every job.
Can sand mastic be painted?
It’s traditionally left unpainted, as guidance on traditional windows advises. Talk to us before any painting near it.
Common problems we fix in South Street
Age is the main cause. Sand mastic is a maintenance item like any pointing, depending on exposure and upkeep.
Keep an eye out for any of the following:
- Old sand mastic that has cracked, crumbled or fallen out
- Mastic round period door frames that has failed
- Draughts and rain around sash boxes
- Mastic that needs renewing before redecorating
If you live in an older home near Church of St Mary the Virgin, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Before booking anyone
- How much experience the applicator has
- What the cure time is
- What happens if the job turns out different
- Whether VAT is included
Places near South Street
Other services in South Street
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
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.