Greater London · England
Sand Mastic in St Paul's Cray
We cover St Paul's Cray for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Old sand mastic that has cracked, crumbled or fallen out
- Draughts and rain around sash boxes
- Failed mastic on an exposed elevation
Why act early in St Paul's Cray
Draughts round a sash window are not always the sashes. Open mastic joints round the box can let air in and new mastic seals them. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in St Paul's Cray, the repair is bigger than a sealant job.
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we will go through it with you.
Why us?
- Trusted Arbo and Everbuild sealants
- Fully insured
- 180+ five-star Google reviews
- ARBOMaster approved applicator
Read what affects the cost or what customers say.
Sand mastic in St Paul's Cray
We renew sand mastic around sash windows and doors in stone and brick. The old mastic is raked out, and new mastic is applied and shaped by hand. If you have mastic round period door frames that has failed and mastic that needs renewing before redecorating, we can put it right, on brick reveals, sash and case windows and tenement windows alike.
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.
A one-year guarantee comes as standard.
- Place
- St Paul's Cray (BR5, BR7)
- Wider area
- Greater London
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What happens on the day
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a few hours per window, depending on the condition of the joints and we leave things clean and tidy. In a London area like St Paul's Cray, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Getting ready for the visit
- Let us know about stairs, lifts or work at height
- For indoor joints, keep the area dry beforehand if you can
- Mention if the joints have been sealed before
Getting a quote
Asking for a quote is easy: let us know what needs doing and where. A few photos by email make the job easier to understand, and we will come back to you with a quote.
Related advice
What we are called out for in St Paul's Cray
Paint, silicone or cement used over old mastic causes problems. They don’t suit the joint and we normally remove them.
Signs it’s time to call us include:
- Window mastic to renew ahead of painting
- Mastic worn away on windows facing the weather
- Old cement repairs round a window that have failed
- Gaps round a timber door in stone or brick
For landlords with property near St Mary Cray station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
What to look for in a quote
- How long to leave it before use
- Who turns up on the day
- What happens if the job turns out different
- Whether they’re fully insured
Can I do it myself?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
Common questions in St Paul's Cray
Is parking a problem for a job in St Paul's Cray?
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.
Do you work for landlords with property near St Mary Cray station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear quote.
Can I do it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
What information do you need?
Tell us what needs doing and where. We’ll ask anything else we need to know.
Do you work in St Paul's Cray?
Yes. From our base in Crawley, we cover South East England, London and all of Scotland, and that includes St Paul's Cray.
Can you replace silicone on a period window with sand mastic?
Often, yes. Once the silicone is out and the joint prepared, sand mastic is applied by hand.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first.
Towns and villages near St Paul's Cray
What else we do in St Paul's Cray
Frames and glazing around St Paul's Cray
Historic houses like Bromley Palace (about 3.7 miles west) are a reminder that the area around St Paul's Cray has older buildings as well as new. Where a home is older, 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you live in an older home near St Barnabas, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. St Paul's Cray is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
St Paul's Cray is about 1 mile north of Orpington, in Greater London. St Paul's Cray gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. 764 places in Greater London are on our list, large and small. London is on our list too, around 11 miles away.
Work in BR5 and BR7 works the same way as everywhere else we cover. We cover properties on Main Road, Murray Road and Rushet Road. Nearby, we also carry out sand mastic in St Mary Cray (1 mile south), Poverest (1 mile south), Derry Downs (1 mile south), Orpington (1 mile south) and Kevington (2 miles south-east). Larger places within reach include London (11 miles north-west), City of Westminster (14 miles north-west), Marylebone (14 miles north-west), Kensington (15 miles north-west), St Pancras (13 miles north-west) and Shoreditch (12 miles north-west).
Local landmarks in St Paul's Cray
Around St Paul's Cray, our work takes us to homes and buildings near Kemnal Technology College, The Blue Anchor Public House and Walsingham School and the streets around them. There’s a railway station in St Paul's Cray itself: St Mary Cray station. Nearby you’ll also find Lullingstone Castle (4.8 miles south-east) and London Borough of Bromley Museum (1.5 miles south). The countryside around St Paul's Cray includes The Warren and Summer Hill.
Surface by surface
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We can do one window or several.
Period and listed homes
A traditional finish suits a period property, and sand mastic is one of them.
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Ask a joiner to look at soft timber first
- Take care around the mastic when scraping paint
- Clear gutters so water does not pour onto the windows
- Check with your local planning authority if your home is listed
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry so early renewal protects both.
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Putty and glazing repairs
- Sash cords, weights and draught-proofing of the sashes
- Damaged stone surrounds
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
Where we work in St Paul's Cray
- Brick reveals
- Timber door frames
- Sash and case windows
- Period & listed homes
- Tenement windows
- Stone surrounds