Greater London · England
Sand mastic for sash & case windows in Bopeep, Greater London
Sand mastic in Bopeep from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Window mastic to renew ahead of painting
- Silicone on a period window that looks wrong
- Gaps between timber frames and stone or brick
How it works
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a few hours for a single window, longer for several, and the area is left clean. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Bopeep. It helps if you can point us to a visitor permit or a bay close to the door.
- 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.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Move anything stored near the joints
- Tell us if parking is tricky
- Plan for the work area to be out of bounds to pets and children
Ask for a quote
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. Whenever you are ready, phone 0345 464 0079 or send us an email.
Related advice
Sand mastic in Bopeep, done properly
Burnt sand mastic is a traditional material blends with stone and brick surrounds. It’s a good fit for period properties where a modern sealant bead would stand out. If you’re dealing with mastic dropping out of the joint and gaps where the frame meets the masonry, we can help.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease usually says who is responsible for the windows, so it’s worth checking before booking, and access in Bopeep is something to talk through when you book.
Every job comes with our one-year guarantee, wherever you are in Greater London.
- Where
- Bopeep (BR6)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Places near Bopeep
Other services in Bopeep
What sand mastic looks like in Bopeep
In a converted house or block, who looks after the windows depends on the lease, so check that before you book. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Bopeep is in London, so parking needs planning: let us know about parking bays, permits or a driveway. For site and facilities teams at buildings such as Chelsfield Primary School, larger buildings have plenty of frames, and the mastic around each one ages. In the older streets around Mission Chapel, the joint between an old wall and a newer frame is generally the first place rain gets in.
Bopeep is about 3 miles south-east of Orpington, in Greater London. Jobs in Bopeep get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 764 towns and villages across Greater London, from the larger towns to small villages. We also work in London, about 14 miles from Bopeep.
Here we cover the BR6 postcode area for sand mastic. Streets in the area include Shoreham Lane and Hewitts Road. Nearby, we also carry out sand mastic in Maypole (1 mile north), Well Hill (1 mile north-east), Chelsfield (1 mile north-west), Badgers Mount (1 mile south) and Pratt's Bottom (1 mile south-west). We also work in nearby towns such as London (14 miles north-west), Shoreditch (15 miles north-west), Whitechapel (15 miles north-west), Stockwell (14 miles north-west), Orpington (3 miles north-west) and Plaistow (13 miles north-west).
What’s near Bopeep
We work in homes and buildings around St Olave's and St Saviour's Grammar School, The Bo-Peep pub and Hewitt's Chalk Bank, among other places. The nearest railway station is Knockholt station, roughly 0.6 miles south-west. Other landmarks nearby include London Borough of Bromley Museum (2.4 miles north-west) and Lullingstone Castle (2.5 miles east). Green spaces nearby include The Warren.
Why deal with it now?
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. In a flat in Bopeep, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
A few things move the cost up or down: 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.
What you get with us
- Rated 4.9 stars on Google
- Anti-fungal sanitary silicone in wet areas
- We leave the area clean and tidy
- Arbo and Everbuild products
Take a look at what affects the cost and our reviews.
Your questions about sand mastic in Bopeep
Is parking a problem for a job in Bopeep?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Do you work for landlords with property near Knockholt station?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can be quoted together. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll send you a clear quote.
Can I do it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We will tell you what we’re using and why.
Do the sealants smell?
There can be a smell while the sealant cures, but it fades. Opening a window helps.
What should I tell you?
The location, the problem and the rough size of the job. If you can, email a few pictures.
What is sand mastic?
Sand mastic is a traditional material for pointing round windows and doors. It combines sand with a linseed-oil-based binder.
Do you work in Bopeep?
Yes. From our base in Crawley, we cover South East England, London and all of Scotland, Bopeep included.
When it isn’t the sealant
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Decayed frames that need repair
- Masonry that needs repairing
- Decisions on consent for listed homes
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think.
What we seal
- Timber door frames
- Brick reveals
- Tenement windows
- Period & listed homes
- Stone surrounds
- Sash and case windows
What the job involves on each surface
Brick reveals
An open joint at a brick reveal lets weather in. Renewing the mastic closes it.
Stone surrounds
Stone openings are rarely perfectly straight, so the gap is not the same all the way round. We shape it by hand to follow the stone.
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Landlords and agents in Bopeep can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Get any rot dealt with first
- Avoid patching sand mastic with silicone
- Ask the planning authority about consent for listed or conservation-area homes
- Renew mastic before redecorating the windows
Do not touch or press the mastic while it hardens. It skins over quickly but needs longer to fully harden.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
How we quote for sand mastic
Your quote is based on your job. We take into account:
- The type of sealant required
- The size of the job
- Whether there’s mould to deal with
- How many areas need sealing
Doing several joints on one visit generally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We will give you a clear quote for the lot.
What to tell us for a quote
What to tell us when you ask for a quote:
- Whether it has been sealed before
- The rough size of the job
- What the problem is, such as mould, gaps, leaks or cracking
- Access, such as stairs, a lift or height
There’s no standard price list, because every job is different. Instead, we give you a clear price for your job. To arrange one, phone 0345 464 0079 or drop us an email.