Greater London · England
Sand mastic for sash & case windows in Crofton, Greater London
Sand mastic for Crofton and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Cement or filler used on old window joints that has cracked
- Window mastic to renew ahead of painting
- Cracked mastic round a front door frame
Sand mastic in Crofton, done properly
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. Typical jobs include cracked mastic round a front door frame and gaps between timber frames and stone or brick, across brick reveals, stone surrounds and sash and case windows.
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, which is when draughts and damp patches appear in homes in Crofton.
Your job is guaranteed for a year, as with all our work.
- Place
- Crofton (BR6, BR5)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Looking after it afterwards
After the cure time, these simple habits help:
- Check the mastic when you check the paintwork
- Renew mastic before redecorating the windows
- Make sure water runs off the sill
- Check with your local planning authority if your home is listed
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.
What we can’t put right
In fairness, some problems need a different trade:
- Decisions on consent for listed homes
- Sashes that need overhauling
- Damaged stone surrounds
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly before booking.
Joints and surfaces we work on
- Stone surrounds
- Brick reveals
- Sash and case windows
- Timber door frames
- Period & listed homes
- Tenement windows
Landlord and commercial work in Crofton
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can go on one quote.
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.
Frames and glazing around Crofton
In a converted house or block, who looks after the windows depends on the lease, so check that before you book. With historic houses such as Bromley Palace (about 3.2 miles north-west) nearby, there’s older building stock in the area around Crofton as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Crofton is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Schools such as Crofton Infant School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Crofton is about 1 mile south-west of Orpington, in Greater London. Whether you’re in the middle of Crofton or further out, we cover sand mastic for every kind of property. Crofton is one of 764 places in Greater London we cover for sand mastic. We also work in London, around 11 miles away.
We cover every part of BR6 and BR5 for sand mastic. We cover properties on Grange Road, Reed Avenue and Gumping Road. Close by, we work in Broom Hill (1 mile north-east), Locksbottom (1 mile west), Petts Wood (1 mile north), Farnborough (1 mile south) and Green Street Green (2 miles south). We also work in nearby towns such as London (11 miles north-west), City of Westminster (14 miles north-west), Marylebone (14 miles north-west), Kensington (15 miles north-west), St Pancras (14 miles north-west) and Shoreditch (12 miles north-west).
Landmarks near Crofton
Around Crofton, our work takes us to homes and buildings near The Priory School, Newstead Wood School and The Maxwell pub. Crofton has its own railway station: Orpington station. Nearby you will also find Orpington Hospital (1.1 miles south-east) and Crofton Roman Villa (less than half a mile south-east). For a walk, there’s Summer Hill and The Warren.
Different surfaces, different methods
Timber door frames
Round a period front door, sand mastic gives the right look.
Sash and case windows
Sash windows are where we do most sand mastic work. Each joint round the box is raked out and renewed.
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Questions from Crofton
Is parking a problem for a job in Crofton?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Do you cover Crofton for sand mastic?
Yes, Crofton is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or send us an email and tell us what needs doing.
How much does sand mastic cost in Crofton?
Every job is different, so each one gets its own quote. To get one, call 0345 464 0079 or drop us an email and let us know what needs doing and where.
What do you need from me for a quote?
Tell us what needs doing and where, with pictures by email if possible. If we need more, we will ask.
Do you work for landlords and businesses?
Yes. We work for householders, landlords, letting agents, businesses and hotels in Crofton.
I’m a tenant. Can you help?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. Working times can be discussed when we quote.
Other services in Crofton
How it works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes a few hours for a single window, longer for several, including the tidy-up. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Crofton. It helps if you can point us to a visitor permit or a bay close to the door.
- 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.
- We finish the mastic to a tidy line.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any leaks or damp you’ve noticed
- Plan for the work area to be out of bounds to pets and children
How to get a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To get started, phone 0345 464 0079 or send us an email.
Advice
Common problems we fix in Crofton
Previous repairs in cement or silicone often trap water or crack away. They do not move with the timber and we normally remove them.
Look out for any of the following:
- Old sand mastic that has cracked, crumbled or fallen out
- Mastic round period door frames that has failed
- Gaps where the frame meets the masonry
- Wind and rain getting in round a sash window
If you live in an older home near Church of Jesus Christ of Latter-Day Saints, the joint between an old wall and a newer frame is normally the first place rain gets in.
Comparing quotes
- How hidden problems are handled
- Whether the sealant suits the joint
- The length of the guarantee
- Who turns up on the day