Greater London · England
Crystal Palace Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Crystal Palace. Fully insured, ARBOMaster approved and guaranteed for a year.
- Gaps round a timber door in stone or brick
- Old sand mastic that has cracked, crumbled or fallen out
- Draughts and rain around sash boxes
Sand mastic for homes and businesses in Crystal Palace
Fresh sand mastic forms a skin quite soon but full hardening takes longer. Traditionally, sand mastic is left unpainted, so ask us before you decorate. We work on timber door frames, brick reveals and stone surrounds, and the jobs we see most are failed mastic on an exposed elevation and mastic dropping out of the joint.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in, in Crystal Palace as anywhere.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Crystal Palace (SE19, SE20, SE26)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What sealant work cannot fix
In fairness, there are a few things sealant will not fix:
- Masonry that needs repairing
- Rotten sashes, sills or window boxes (a joiner’s job)
- Sashes that need overhauling
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly.
Surfaces we seal
- Timber door frames
- Period & listed homes
- Brick reveals
- Sash and case windows
- Tenement windows
- Stone surrounds
Crystal Palace: your questions answered
Do you work for landlords with property near Crystal Palace station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Is Crystal Palace in your area for sand mastic?
Yes. Our work covers London and the South East, and Crystal Palace is part of that. Just call 0345 464 0079 or send us an email with a few details of the job, and we will send you a clear quote.
Where is Mr Mastic based?
We work from Crawley. We cover Crystal Palace and the rest of Greater London, along with the rest of our area.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Do you hold any approvals?
Yes. We are approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
What should I tell you?
Only a few details: where it is, what you’ve noticed and how we reach it. Then ring 0345 464 0079 or send us an email.
Are you insured?
Yes. Full insurance covers our work.
Is it possible to take out silicone and use sand mastic instead?
Often, yes. With the silicone removed and the joint cleaned we point it with sand mastic.
Sand mastic in Crystal Palace: local notes
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Kingswood House (about 0.9 miles north-west) are a reminder that the area around Crystal Palace 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.
Managing a site like Crystal Palace School? Then the mastic around its windows and doors needs looking after like any other building’s. Crystal Palace is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Crystal Palace is about 2 miles north-east of Thornton Heath, in Greater London. For sand mastic in and around Crystal Palace, it’s easy to get a quote: please call 0345 464 0079 or drop us an email. We cover Greater London from our Crawley base, Crystal Palace included. Across Greater London, we cover 764 places, Crystal Palace among them. London is on our list too, around 6 miles away.
Every address in SE19, SE20 and SE26 is within our area for sand mastic. You’ll find streets such as Tudor Road, Colby Road and Church Road, and we cover them all. If you are just outside Crystal Palace, we cover Anerley (1 mile south), Penge (1 mile south-east), Gipsy Hill (1 mile west), Upper Norwood (1 mile west) and Sydenham (1 mile north-east). Further out, we also cover London (6 miles north), City of Westminster (7 miles north-west), Marylebone (7 miles north-west), Kensington (8 miles north-west), St Pancras (8 miles north) and Shoreditch (7 miles north).
Landmarks near Crystal Palace
In Crystal Palace, that means homes and buildings near The Grape & Grain pub, Crystal Palace Park and Sydenham High School. There’s a railway station in Crystal Palace itself: Crystal Palace station. Well-known places in the area include Greenwich Castle (5 miles north-east) and Whitgift Centre (3.3 miles south-west). Not far away are Dulwich Upper Wood and Knight's Hill.
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. We suggest:
- Check with your local planning authority if your home is listed
- Keep modern sealant off the mastic
- Check the mastic when you check the paintwork
- Have rotten timber repaired before new mastic goes in
Avoid painting over the new mastic, which is the traditional advice. If you’re redecorating, ask us first.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens.
Can I do it myself?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Signs you need sand mastic in Crystal Palace
Previous repairs in cement or silicone often trap water or crack away. They do not move with the timber and we normally remove them.
People usually contact us when they notice something like this:
- Gaps between timber frames and stone or brick
- Mastic that needs renewing before redecorating
- Modern sealant on a period surround
- Draughty sash windows at the surround
If you live in an older home near St Paul's, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Questions to ask before booking
- When the joint can take water or movement
- Is VAT in the price?
- Whether they seal over old material or remove it
- What preparation is included
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together.
In hotels, rooms out of use cost money, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
How it works
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take a few hours for a single window, longer for several. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Mention any sign-in or site rules at work premises
- Mention any parking rules near the property
How to get a quote
To get a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You will have a clear quote before we start.
Advice
Places near Crystal Palace
Also in Crystal Palace
Surface by surface
Tenement and terrace windows
Where a building is shared, window work may involve neighbours, so check who is responsible first.
Brick reveals
Loose mastic comes out and deep gaps are packed before the new mastic goes in.