Greater London · England
Sand mastic for sash & case windows in Peckham, Greater London
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Peckham, backed by a 12-month guarantee. Ask us for a quote.
- Cement or filler used on old window joints that has cracked
- Window mastic to renew ahead of painting
- Silicone on a period window that looks wrong
Sand mastic in Peckham
Across Peckham, we renew sand mastic around sash and case windows. Every joint is cleaned out and filled by hand, finished to suit the masonry. Common call-outs are for mastic that needs renewing before redecorating and a silicone bead on a sash window that spoils the look, on sash and case windows, tenement windows and period & listed homes.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out.
A 12-month guarantee comes as standard, so you’re not left on your own once the job is done.
- Location
- Peckham (SE15, SE14, SE5)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How it works
On the day, we look over the joints with you first, so you know exactly what we’re doing. We protect the surfaces around the joints before any work starts. The work generally takes a few hours per window, depending on the condition of the joints. In Peckham, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Before we arrive
- Tell us if parking is tricky
- Clear items away from the joints we’re working on
- Tell us about any water getting in
Getting a quote
For a quote, phone 0345 464 0079 or email us with the location and a short description of the problem. You’ll have a clear quote before we start.
Related advice
Landlords, agents and businesses in Peckham
For anyone letting property in or around Peckham, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Peckham: your questions answered
Is Peckham in your area for sand mastic?
Yes. Our work covers London and the South East, and Peckham is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear quote.
Is parking a problem for a job in Peckham?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
What information do you need?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply call 0345 464 0079 or email us.
Can I choose the sealant colour?
We help you choose a colour that suits. The choice depends on the product the joint needs.
What is sand mastic?
It’s sand mixed with a linseed-oil-based binder for the joint between timber frames and masonry.
Should I check with the council before work on a listed or conservation-area home?
Checking first is sensible. Your local planning authority can say if consent is needed for work on a listed home or in a conservation area.
Do you do commercial work?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
Is there any odour?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
How the job changes by surface
Timber door frames
Doors face weather and wear and the mastic can crack early. It’s renewed by hand.
Stone surrounds
Stone surrounds suit sand mastic well. The finish blends with the masonry.
Sand mastic in Peckham: local notes
With historic houses such as Queen's House (about 2.6 miles east) nearby, there’s older building stock in the area around Peckham as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Queens Road Peckham station, any sash windows need sound mastic to keep draughts and rain out. Schools such as John Donne Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Peckham is about 2 miles south-east of London, in Greater London. Anywhere in SE15, we cover sand mastic for homes and businesses. Our area takes in 764 places across Greater London, large and small.
Work in SE15, SE14 and SE5 is quoted and booked the same way as anywhere else. Sand mastic is available to properties on Rye Lane, Relf Road and Mona Road. Peckham is on the A2215, which makes it straightforward to reach. If you are just outside Peckham, we cover Nunhead (1 mile south-east), Telegraph Hill (1 mile south-east), South Bermondsey (1 mile north), Surrey Canal (1 mile north-east) and East Dulwich (1 mile south-west). We also work in nearby towns such as City of Westminster (5 miles north-west), Marylebone (5 miles north-west), Kensington (6 miles west), St Pancras (4 miles north-west), Shoreditch (4 miles north) and Walthamstow (8 miles north).
Landmarks near Peckham
We work in homes and buildings around Brimmington Park, The St Thomas the Apostle College and The Kentish Drovers pub. There’s a railway station in Peckham itself: Queens Road Peckham station. A little further out are Peckham Platform (within half a mile north-west) and Southwark Adult Education Institute (less than half a mile east). Not far away are St. James's Park Lake and Knight's Hill.
How we quote for sand mastic
The price is agreed before any work begins. It takes into account:
- How much old sealant there is and how hard it is to remove
- How many rooms, windows or areas are involved
- How easy the joints are to reach
- The product the joint needs
Doing several joints on one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. We will send you a clear quote for the lot.
What to tell us for a quote
Before you ask for a quote, have a think about:
- The problem you’ve noticed
- Whether it’s a home or a business
- Pictures of the joints, sent by email
- Roughly how big the job is
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. When it suits you, phone 0345 464 0079 or send us an email.
Common problems we fix in Peckham
Over the years, sand mastic weathers. It hardens, cracks and starts to come away from the frame or the masonry.
The most common problems we see are:
- Gaps between timber frames and stone or brick
- Modern sealant on a period surround
- Draughty sash windows at the surround
- Mastic dropping out of the joint
In the older streets around All Saints Church, the joint between an old wall and a newer frame is usually the first place rain gets in.
Before you book anyone
- When the joint can take water or movement
- How long the guarantee is
- Whether you can choose the colour
- Is VAT in the price?
Towns and villages near Peckham
What else we do in Peckham
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
How to look after the new joints
No joint lasts for ever, but care makes a real difference. A few tips:
- Renew mastic before redecorating the windows
- Find out about consent before window work on a listed home
- Don’t run silicone over sand mastic
- Clear gutters so water doesn’t pour onto the windows
When preparing windows for paint, take care around the mastic. Hard scraping can loosen it.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.