Greater London · England
Sand Mastic in Brasted Chart
Window and door surrounds in Brasted Chart need attention? We cut out the old, prepare the joints and apply the right sealant.
- Old sand mastic that has cracked, crumbled or fallen out
- Cracked mastic round a front door frame
- Modern sealant on a period surround
About our sand mastic in Brasted Chart
Old sand mastic cracks, crumbles and falls out over time and gaps open up round the frame. Renewing it closes the gap and tidies the surround. If you have gaps where the frame meets the masonry and a silicone bead on a sash window that spoils the look, we can put it right, on timber door frames, period & listed homes and brick reveals alike.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
A 12-month guarantee comes as standard, so you are not left on your own once the job is done.
- Location
- Brasted Chart (TN16)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What sand mastic looks like in Brasted Chart
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. With historic houses such as Quebec House (about 1.2 miles west) nearby, there’s older building stock in the area around Brasted Chart as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Homes close to Church of St Martin include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. As a London address, Brasted Chart can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Brasted Chart is about 4 miles west of Sevenoaks, in Greater London. For sand mastic in and around Brasted Chart, please call 0345 464 0079 or send us an email for a quick quote. We cover Greater London from our Crawley base, Brasted Chart included. 764 places in Greater London are on our list, from the larger towns to small villages. There’s also a page for Crawley, about 16 miles away.
We cover every part of TN16 for sand mastic and the streets around it. Local streets include Chart Lane and Pipers Lane. Neighbouring places we cover for sand mastic include Brasted (1 mile north), Toy's Hill (1 mile south), Sundridge (1 mile north-east), Ide Hill (2 miles south-east) and Goathurst Common (2 miles south-east). Larger places within reach include Orpington (8 miles north), Thornton Heath (13 miles north-west), Croydon (11 miles north-west), Streatham (15 miles north-west), Bromley (10 miles north) and West Norwood (14 miles north-west).
Near you in Brasted Chart
The nearest railway station is Sevenoaks station, roughly 3.6 miles east. Well-known places in the area include Tandridge Priory (3.3 miles west). The countryside around Brasted Chart includes Betsom's Hill and Dryhill Nature Reserve.
What affects the cost of sand mastic
We don’t publish a price list, because no two jobs are the same. The quote depends on:
- Whether there’s mould to deal with
- When we can work, for business premises
- The size of the job
- The product the joint needs
The cost reflects the work involved, not guesswork. That is why we ask a few questions first and send you a clear quote before we start.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Pictures of the joints, sent by email
- Where the job is, and your postcode
- Access, such as stairs, a lift or height
- The rough size of the job
We quote each job on its own. Simply phone 0345 464 0079 or drop us an email and describe the job, and photos are welcome.
FAQs for Brasted Chart
Is parking an issue for sand mastic in Brasted Chart?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Can you do sand mastic in Brasted Chart?
Yes. We work across London and the South East, and Brasted Chart is part of that. You can call 0345 464 0079 or send us an email and tell us what needs doing.
Is it possible to take out silicone and use sand mastic instead?
Normally, yes. With the silicone removed and the joint cleaned, sand mastic is applied by hand.
Do you work for landlords and businesses?
Yes. Domestic, commercial and hotel work are all part of what we do.
How long does the job take?
Typically it takes anything from a few hours to a full day, depending on how many windows. Bigger jobs take longer, and we’ll say how long yours will take.
What do you need from me for a quote?
Just the basics: the address or postcode, what’s wrong and any access issues. Then phone 0345 464 0079 or send us an email.
Can you match the sealant colour?
In most cases you can choose. We will tell you which colours the right product comes in.
What’s sand mastic made of?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Do not paint over the new mastic
- Check with your local planning authority if your home is listed
- Go gently near the mastic when preparing windows
- Make sure water runs off the sill
Leave the new mastic unpainted, which is the traditional advice. If you’re redecorating, ask us first.
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.
What we do, step by step
The work is kept neat and contained to the joints we are treating, so you can get on with your day. The job usually takes a few hours per window, depending on the condition of the joints. In Brasted Chart, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- Move anything stored near the joints
- For business premises, tell us about site rules or sign-in
- Let us know about earlier repairs to the joints
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 explain what’s involved and give you a clear price.
Read more
What happens if it’s left?
Gaps round a sash window let in rain and draughts. Left, water can reach the timber and the wall so renewing it early protects the window. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Brasted Chart, the repair is bigger than a sealant job.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Why Brasted Chart customers choose us
- Tidy, careful work
- Anti-fungal sanitary silicone in wet areas
- Fully insured
- ARBOMaster approved applicator
See what affects the cost or our reviews.
Towns and villages near Brasted Chart
Also in Brasted Chart
Work for landlords, hotels and businesses
We work for landlords and agents as well as homeowners. Resealing between tenancies keeps a property looking cared for.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
What the job involves on each surface
Brick reveals
Loose mastic comes out and deep gaps are packed before pointing.
Sash and case windows
Sash windows are where we do most sand mastic work. We renew the mastic round each box.
When to call us in Brasted Chart
Water gets into small cracks in the mastic and pushes it out. Exposed elevations usually fail first.
The most common problems we see are:
- Old cement repairs round a window that have failed
- Modern sealant on a period surround
- Old sand mastic that has cracked, crumbled or fallen out
- Gaps where the frame meets the masonry
Letting a property close to Sevenoaks station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Comparing quotes
- Which sealant they’ll use, and why
- Whether they seal over old material or remove it
- Which colour the sealant will be
- How much experience the applicator has