Greater London · England
Sand Mastic in Telegraph Hill
Our applicators work in Telegraph Hill on 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.
- Silicone on a period window that looks wrong
- Tired mastic found when preparing windows for paint
- Weathered mastic on the most exposed windows
Sand mastic in Telegraph Hill, done properly
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. We work on period & listed homes, brick reveals and tenement windows, and the jobs we see most are open joints round the window box and window mastic to renew ahead of painting.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. The mastic around them dries out and cracks with age, letting in draughts and water.
The work is covered for a year after we finish. If there’s a problem with it, please ring 0345 464 0079 or email us.
- Location
- Telegraph Hill (SE4, SE15, SE14)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Landlord and commercial work in Telegraph Hill
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
If you manage several properties in or around Telegraph Hill, several properties can be quoted together. Just tell us the addresses and what each one needs.
Questions from Telegraph Hill
Is parking an issue for sand mastic in Telegraph Hill?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Is Telegraph Hill in your area for sand mastic?
Yes, Telegraph Hill is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear quote.
Where do you work from?
Our base is Crawley. Our area covers South East England, London and Scotland.
Will there be a smell?
Some sealants have a smell while they cure. Opening a window helps.
Which is right for my windows, sand mastic or modern sealant?
For period timber windows in stone or brick, sand mastic is often the better fit. On modern frames, we’d normally use a flexible sealant, and we’ll explain why.
What information do you need?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
Can landlords and businesses book you?
Yes. Domestic, commercial and hotel work are all part of what we do.
Can you work on commercial sites?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Surface by surface
Stone surrounds
The stone is treated with care while raking out the old mastic.
Sash and case windows
Sash windows are where we do most sand mastic work. We renew the mastic round each box.
Also in Telegraph Hill
What affects the cost of sand mastic
There’s no set price list. What we look at:
- Any working-time requirements on site
- The old material and how stubborn it is
- Any mould that needs treating
- The product the joint needs
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part, and we’ll explain the quote if you ask.
Helping us quote
You don’t need to know the technical terms. Just tell us:
- Any access issues, like height or stairs
- What the problem is, such as mould, gaps, leaks or cracking
- A few photos by email, if you can
- The address or postcode of the job
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 photos if that’s easy.
What we do, step by step
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. It normally takes a few hours per window, depending on the condition of the joints. In Telegraph Hill, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Before we arrive
- Tell us if parking is tricky
- Tell us about any previous sealing or DIY attempts
- On commercial sites, let us know about site rules
Get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. Whenever you’re ready, call 0345 464 0079 or email us.
Read more
Telegraph Hill homes and the weather
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. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.
If you let a flat or house near Brockley station, older sash windows in a rental need their mastic kept sound to keep the weather out. Managing a site like Haberdashers' Hatcham College? Then the mastic around its windows and doors needs looking after like any other building’s.
Telegraph Hill is about 1 mile south-west of New Cross, in Greater London. Homes, rented property, offices and hotels in Telegraph Hill can book us for sand mastic. The work is guaranteed for a year. Our area takes in 764 places across Greater London.
We cover every part of SE4, SE15 and SE14 for sand mastic. If you need sand mastic at a property on Mona Road, Pepys Road and Kitto Road or a nearby road, our applicators can take on the job. Other places close to Telegraph Hill include Nunhead (1 mile south-west), New Cross (1 mile north-east), Peckham (1 mile north-west), St Johns (1 mile east) and Brockley (1 mile south-east). Within a short drive, we also cover London (3 miles north-west), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (7 miles west), St Pancras (5 miles north-west) and Shoreditch (4 miles north).
Around Telegraph Hill
We work in homes and buildings around Fordham Park and The Brockley Barge pub. Telegraph Hill has its own railway station: Brockley station. Nearby you’ll also find Southwark Adult Education Institute (0.6 miles north-west) and Lewisham Shopping Centre (1.4 miles east). For a walk, there’s St. James's Park Lake and New Cross Gate Cutting.
Looking after it afterwards
So the new joints stay in good condition:
- Keep sills and gutters clear so water drains away
- Check with your local planning authority if your home is listed
- Plan mastic work ahead of painting
- Ask a joiner to look at soft timber first
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
Sound mastic protects the frame. Once it fails, water can sit against the timber, which can lead to rot.
What we’re called out for in Telegraph Hill
Age is the main cause. Even well-laid mastic needs renewing in time and how long it lasts depends on the weather it faces.
Most people get in touch after spotting one of these:
- Wind and rain getting in round a sash window
- Silicone on a period window that looks wrong
- Window mastic to renew ahead of painting
- Old sand mastic that has cracked, crumbled or fallen out
Homes close to St Catherine's Hatcham include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
What to look for in a quote
- What happens if they find a problem under the old sealant
- Are they insured?
- What preparation is included
- The length of the guarantee
Can I do it myself?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.