Greater London · England
Sand Mastic in Streatham Hill
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Streatham Hill and across Greater London. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Cement or filler used on old window joints that has cracked
- Gaps where the frame meets the masonry
- Old sand mastic that has cracked, crumbled or fallen out
Sand mastic in Streatham Hill
Burnt sand mastic is a traditional material that sits naturally against stone and brick. It’s a good fit for period properties, where modern sealant can look out of place. If you have mastic that needs renewing before redecorating and mastic dropping out of the joint, we can put it right, whatever the surface.
Many London homes are flats, with windows high above the street. 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 Streatham Hill is something to talk through when you book.
You’re covered for a year from the day we finish. If anything is not right with it, phone 0345 464 0079 or send us an email.
- Where
- Streatham Hill (SW2, SW16, SW12)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
When it is not the sealant
We’d rather tell you now than do work that won’t last, so here’s what sealant cannot put right:
- Cracked or broken glass
- Rotten sashes, sills or window boxes (a joiner’s job)
- Sashes that rattle, stick or won’t open
If in doubt, ring 0345 464 0079 or email us and we will say what we think before you book.
What we seal
- Sash and case windows
- Stone surrounds
- Period & listed homes
- Timber door frames
- Brick reveals
- Tenement windows
Frames and glazing around Streatham Hill
With historic houses such as Kingswood House (about 1.9 miles east) nearby, there’s older building stock in the area around Streatham Hill as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Streatham Hill is in London, so parking needs planning: let us know about parking bays, permits or a driveway. Letting a property close to Streatham Hill station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Streatham Hill is about 2 miles south of Stockwell, in Greater London. Every kind of property in Streatham Hill can book us for sand mastic. The work is guaranteed for a year. Streatham Hill is one of 764 places in Greater London where we work for sand mastic.
Every address in SW2, SW16 and SW12 is covered for sand mastic. Whether your property is on Keymer Road, Romeyn Road and Palace Road or a nearby road, we can help. Main roads around Streatham Hill include the A205. Neighbouring places we cover for sand mastic include Tulse Hill (1 mile north-east), Hyde farm estate (1 mile west), Streatham (1 mile south), Grange Mills (1 mile west) and Clapham Park (1 mile north-west). Further out, we also cover London (4 miles north), City of Westminster (5 miles north), Marylebone (5 miles north), Kensington (5 miles north-west), St Pancras (6 miles north) and Shoreditch (6 miles north).
What’s near Streatham Hill
Locally, jobs take us to homes and businesses close to City Heights E-ACT Academy, Streatham Common and The Holland Tringham pub, among other places. Streatham Hill has its own railway station: Streatham Hill station. Well-known places in the area include Tooting Bec Hospital (1.4 miles south-west) and Southside Wandsworth (3.2 miles west). For a walk, there’s Battersea Park Lake and Knight's Hill.
Surface by surface
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
Brick reveals
Loose mastic comes out and deep gaps are packed before pointing.
What affects the quote in Streatham Hill
Jobs vary more than people expect. The main factors:
- When we can work, for business premises
- Whether the work is at height
- Whether old sealant or filler has to be cut out
- The amount of work
Leaving a failed joint generally makes the job bigger, not smaller. If you are unsure, call 0345 464 0079 or email us and we will give you an honest view and a quote.
What to tell us for a quote
To help us quote quickly, please include:
- Whether it’s a home or a business
- Pictures of the joints, sent by email
- How we’d reach the joints
- What the problem is, such as mould, gaps, leaks or cracking
There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or email us.
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. A few tips:
- Ask us before painting near the mastic
- Plan mastic work ahead of painting
- Check with your local planning authority if your home is listed
- Make sure water runs off the sill
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
Signs you need sand mastic in Streatham Hill
Timber swells and shrinks with the weather. The movement cracks the mastic over time.
These are the problems we’re asked about most:
- Cracked mastic round a front door frame
- Crumbling sand mastic round a window
- Open joints round the window box
- A silicone bead on a sash window that spoils the look
Homes close to Church of St Margaret include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in.
What to look for in a quote
- Whether VAT is included
- What guarantee comes with the work
- How hidden problems are handled
- Which sealant they’ll use, and why
Towns and villages near Streatham Hill
More services for Streatham Hill
How it works
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes a few hours per window, depending on the condition of the joints from start to finish. In a London area like Streatham Hill, the main things to plan are parking and access: 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.
- Old mastic and any loose material are raked out.
- 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.
How to prepare
- For business premises, tell us about site rules or sign-in
- Clear the area around the work
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
If you are in Streatham Hill and need sand mastic, ring 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before we start.
Advice
Streatham Hill: your questions answered
Can parking be tricky for a visit in Streatham Hill?
Parking in Streatham Hill, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Do you work for landlords with property near Streatham Hill station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
Can old silicone round a sash window be swapped for sand mastic?
Yes. We remove the silicone and clean the joint before the sand mastic goes in.
What information do you need?
A short description and the location, with photos by email if possible. We’ll ask anything else we need to know.
Is the work guaranteed?
There’s a 12-month guarantee on every job, sand mastic included.
Where do you work from?
We’re based in Crawley, and we cover South East England, London and all of Scotland.
Do I have to be there?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Which is right for my windows, sand mastic or modern sealant?
Sand mastic generally suits period timber windows best. On modern frames, we’d normally use a flexible sealant, and we’ll explain why.