Greater London · England
Sand Mastic in Hadley
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Hadley. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Weathered mastic on the most exposed windows
- Gaps between timber frames and stone or brick
- Draughts and rain around sash boxes
How to look after the new joints
So the new joints stay in good condition:
- Check the mastic when you check the paintwork
- Do not paint over the new mastic
- Avoid heavy scraping on the mastic joint
- Plan mastic work ahead of painting
Don’t 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. Renewing it then is simpler than waiting until it falls out.
About our sand mastic in Hadley
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. We are often asked to deal with gaps between timber frames and stone or brick and a silicone bead on a sash window that spoils the look, on stone surrounds, sash and case windows and tenement windows.
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 Hadley is something to talk through when you book.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Place
- Hadley (EN5, EN4)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Signs you need sand mastic in Hadley
Paint, silicone or cement used over old mastic causes problems. They do not suit the joint and we normally remove them.
Signs it’s time to call us include:
- Modern sealant on a period surround
- Mastic round period door frames that has failed
- Old sand mastic that has cracked, crumbled or fallen out
- Weathered mastic on the most exposed windows
For site and facilities teams at buildings such as Susi Earnshaw Theatre School, larger buildings have plenty of frames, and the mastic around each one ages.
Before booking anyone
- Which sealant they’ll use, and why
- Whether they’re fully insured
- How hidden problems are handled
- Whether you can choose the colour
What sand mastic looks like in Hadley
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to Christ Church include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Rented homes near New Barnet station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
Hadley is about 1 mile north-west of Barnet, in Greater London. For sand mastic in and around Hadley, please phone 0345 464 0079 or drop us an email for a quick quote. We cover Greater London from our Crawley base, Hadley included. 764 places in Greater London are on our list. Our London page covers work nearby, about 12 miles away.
Here we cover the EN5 and EN4 postcode area for sand mastic. That includes homes and businesses on Byng Road, Park Road and Dury Road. Hadley sits on or near the A1081, which makes travel easy. If you’re just outside Hadley, we cover High Barnet (1 mile west), Kitts End (1 mile north), Arkley (1 mile south-west), Totteridge (1 mile south) and Dancers Hill (2 miles north). We also work in nearby towns such as London (12 miles south-east), City of Westminster (10 miles south), Marylebone (10 miles south), Kensington (11 miles south), St Pancras (10 miles south) and Shoreditch (10 miles south-east).
What’s near Hadley
Locally, jobs take us to homes and businesses close to Foulds School, Queen Elizabeth's Girls' School and Ye Olde Monken Holt pub. The closest station to Hadley is New Barnet station, about 1.3 miles south-east of the centre. Other landmarks nearby include Barnet General Hospital (0.7 miles south-west) and Spires Shopping Centre (less than half a mile south-west). For a walk, there’s Darland's Lake and King George's Fields (Monken Hadley).
How the visit works
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, do the work and clear up. It usually takes anything from a few hours to a full day, depending on how many windows. In a London area like Hadley, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- First, we look at the surrounds with you and agree what needs doing.
- Old, loose mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Preparing for the visit
- Tell us about any previous sealing or DIY attempts
- Mention any leaks or damp you’ve noticed
- Try not to wet indoor joints just before the visit
Ask for a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Advice
Landlords, agents and businesses in Hadley
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.
We also work for property managers and facilities teams. We can quote a run of properties together.
Common questions in Hadley
Do you work for landlords with property near New Barnet station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear price.
Is parking an issue for sand mastic in Hadley?
Parking in Hadley, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Is there any odour?
Sometimes, a little. It fades as the sealant cures, and ventilation helps.
Where do you work from?
Our base is in Crawley, West Sussex, and we work across South East England, London and Scotland.
Is it possible to take out silicone and use sand mastic instead?
Yes, we do this often. The old silicone has to come out completely so the mastic beds in well.
Can you match the sealant colour?
Generally, yes. Sealants come in white, clear, grey and other colours for many products, and we agree the colour with you before work begins.
How long does the job take?
A typical job takes a few hours per window, depending on the condition of the joints. We will confirm how long when we quote.
Can new sealant go over the old?
No. The old sealant always comes out first.
Towns and villages near Hadley
What else we do in Hadley
What we can’t put right
A few problems are outside what sealant work can do:
- Damaged stone surrounds
- Rotten sashes, sills or window boxes (a joiner’s job)
- Planning or listed building consent (your local planning authority decides)
If you’re not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Surfaces we seal
- Sash and case windows
- Timber door frames
- Period & listed homes
- Brick reveals
- Stone surrounds
- Tenement windows
Surface by surface
Brick reveals
Loose mastic comes out and deep gaps are packed before pointing.
Period and listed homes
Materials matter on listed and conservation-area homes. Sand mastic is often the preferred finish.
Should I try it myself first?
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.