Greater London · England
Sand Mastic in Selhurst
Problem with your window and door surrounds in Selhurst? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Old sand mastic that has cracked, crumbled or fallen out
- Gaps where the frame meets the masonry
- Patchy fillers round a sash window
What affects the cost of sand mastic
Call for a quick quote. The main things that affect it are:
- Any mould that needs treating
- Working hours on commercial sites
- The amount of work
- Access and height
Doing several joints on one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll send you a clear quote for the lot.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- The problem you’ve noticed
- Whether it’s a home or a business
- Access, such as stairs, a lift or height
- The address or postcode of the job
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work before giving you a price.
How we handle sand mastic in Selhurst
Sand mastic has long been used to fill the joint between timber frames and masonry. 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. If you are dealing with gaps between timber frames and stone or brick and window mastic to renew ahead of painting, we can put it right, on tenement windows, sash and case windows and brick reveals alike.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in, in Selhurst as anywhere.
Every job comes with a 12-month guarantee, wherever you are in Greater London.
- Place
- Selhurst (SE25, SE20, CR0)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Places near Selhurst
Also in Selhurst
What we’re called out for in Selhurst
Sand mastic slowly weathers. It hardens, cracks and starts to come away on the stone or timber.
The most common problems we see are:
- Old sand mastic that has cracked, crumbled or fallen out
- Open joints round the window box
- A silicone bead on a sash window that spoils the look
- Gaps round a timber door in stone or brick
For landlords with property near Norwood Junction station, any sash windows need sound mastic to keep draughts and rain out.
What your quote should include
- What preparation is included
- When the joint can take water or movement
- Whether you can choose the colour
- Whether the sealant suits the joint
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
When something else is needed
A few problems are outside what sealant work can do:
- Timber that has rotted
- Masonry that needs repairing
- Whether work needs listed building consent
If you are not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Sash and case windows
- Period & listed homes
- Stone surrounds
- Timber door frames
- Brick reveals
- Tenement windows
How the job changes by surface
Timber door frames
Round a period front door, sand mastic gives the right look.
Stone surrounds
Stone surrounds suit sand mastic well. It finishes to look like part of the surround.
FAQs for Selhurst
Can parking be tricky for a visit in Selhurst?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
I let a flat near Norwood Junction station. Can you help?
Yes, we work for landlords and agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Is sand mastic better than silicone for my windows?
For period timber windows in stone or brick, sand mastic is often the better fit. Modern frames normally suit a flexible sealant, and we’ll explain why.
Can sand mastic be painted?
Sand mastic is normally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
Should I check with the council before work on a listed or conservation-area home?
Speak to your local planning authority before work starts. Like-for-like sand mastic is often the preferred finish but the decision is theirs.
What do you need from me for a quote?
The location, the problem and the rough size of the job. If you can, email a few pictures.
What’s sand mastic made of?
Sand plus a binder based on linseed oil. It’s applied by hand and shaped to suit the surround.
How long does sand mastic take to harden?
Not straight away. The skin forms first, and the full set comes later and we’ll give you an idea for your job.
What we do, step by step
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. 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 Selhurst, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We check the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- Tell us about any previous sealing or DIY attempts
- Mention any parking rules near the property
- Keep children and pets away from the work area
How to get a quote
We quote each job on its own. Just phone 0345 464 0079 or drop us an email with the details.
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Aftercare tips
To keep the joints looking good and working properly:
- Check the mastic when you check the paintwork
- Find out about consent before window work on a listed home
- Go gently near the mastic when preparing windows
- Ask us before painting near the mastic
Don’t run silicone over the new mastic. If you see a crack, ask us to take a look rather than patching it.
Good mastic helps keep the frame dry. Failed mastic lets water reach the timber and timber that stays wet can rot.
What sand mastic looks like in Selhurst
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
For site and facilities teams at buildings such as St Mark's Church of England Primary Academy, larger buildings have plenty of frames, and the mastic around each one ages. Selhurst is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Selhurst is about 5 miles south-east of Stockwell, in Greater London. Every kind of property in Selhurst can book us for sand mastic. Every job comes with our 12-month guarantee. Selhurst is one of 764 towns and villages in Greater London where we work. We also work in London, about 7 miles from Selhurst.
All of SE25, SE20 and CR0 is within our area for sand mastic, from the main roads to the quietest streets. Streets in the area include Park Road, Court Road and Dixon Road. Selhurst sits on or near the A213, so getting to you is simple. Close by, we work in South Norwood (1 mile north), Woodside (1 mile south), Ashburton (1 mile south), Elmers End (1 mile east) and Addiscombe (1 mile south). Within a short drive, we also cover London (7 miles north), City of Westminster (9 miles north-west), Marylebone (9 miles north), Kensington (9 miles north-west), St Pancras (9 miles north) and Shoreditch (9 miles north).
Near you in Selhurst
In Selhurst, that means homes and buildings near Harris Academy South Norwood, South Norwood Recreation Ground and The Albion pub. There’s a railway station in Selhurst itself: Norwood Junction station. Other landmarks nearby include Croydon University Hospital (1.7 miles south-west) and Crystal Palace Museum (1.4 miles north). Green spaces nearby include Duppas Hill and Dulwich Upper Wood.