Greater London · England
Sand mastic for sash & case windows in Hayes, Greater London
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Hayes, backed by a 12-month guarantee. Ask us for a quote.
- Gaps between timber frames and stone or brick
- Mastic round period door frames that has failed
- Failed mastic on an exposed elevation
About our sand mastic in Hayes
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. Common call-outs are for old sand mastic that has cracked, crumbled or fallen out and weathered mastic on the most exposed windows, on tenement windows, period & listed homes and timber door frames.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease normally says who is responsible for the windows, so it’s worth checking before booking, and access in Hayes is something to talk through when you book.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Location
- Hayes (BR4, BR2)
- Wider area
- Greater London
- Cover
- One year on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Hayes homes and the weather
In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking. With historic houses such as Bromley Palace (about 2 miles north) nearby, there’s older building stock in the area around Hayes as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Managing a site like Hawes Down Primary School? Then the mastic around its windows and doors needs looking after like any other building’s. For landlords with property near Hayes (Kent) station, any sash windows need sound mastic to keep draughts and rain out. Hayes is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Hayes is about 2 miles south of Bromley, in Greater London. Jobs in Hayes get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Hayes is one of 764 places in Greater London where we work. We also work in London, about 10 miles from Hayes.
All of BR4 and BR2 is covered for sand mastic, from the main roads to the quietest streets. Streets in the area include Hawes Lane, Crest Road and Keswick Road, and we cover them all. Other places close to Hayes include West Wickham (1 mile west), Coney Hall (1 mile west), Bromley Common (1 mile north-east), Nash (1 mile south) and Eden Park (2 miles north-west). Larger places within reach include London (10 miles north-west), City of Westminster (12 miles north-west), Marylebone (12 miles north-west), Kensington (12 miles north-west), St Pancras (12 miles north-west) and Shoreditch (11 miles north).
What’s near Hayes
In Hayes, that means homes and buildings near Coney Hall Recreation Ground, New Inn and Hayes School and the streets around them. Hayes has its own railway station: Hayes (Kent) station. Other landmarks nearby include National Psychosis Unit (1.6 miles west) and Bethlem Museum of the Mind (1.1 miles east). For a walk, there’s Summer Hill and Hutchinson's Bank.
Surface by surface
Stone surrounds
Sand mastic sits naturally against stone. It finishes to look like part of the surround.
Period and listed homes
Period homes look their best with traditional materials.
How it works
When we arrive, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before any work begins. Most jobs 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. If the building has a concierge, managing agent or access rules, tell us when you book.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Getting ready for the visit
- For business premises, tell us about site rules or sign-in
- Mention any leaks or damp you’ve noticed
- Clear items away from the joints we are working on
Ask for a quote
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job.
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Landlord and commercial work in Hayes
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
Places near Hayes
Other services in Hayes
Hayes questions
Can you help a landlord with a rental near Hayes (Kent) station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
Can you do sand mastic in Hayes?
Yes. We work across London and the South East, and Hayes is part of that. Just phone 0345 464 0079 or email us with a few details of the job.
Can you seal over the old sealant?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Is there any odour?
Sometimes, a little. It fades as the sealant cures.
Is consent needed for window work on a listed home?
Yes, it’s worth checking. Ask your local planning authority whether consent is needed for work on a listed home or in a conservation area.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we’ll explain our choice.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
What exactly is sand mastic?
It’s sand mixed with a linseed-oil-based binder for the joint between timber frames and masonry.
Should I try it myself first?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Why deal with it now?
Not every draught comes from the sashes themselves. Open mastic joints round the box can let air in, and renewing the mastic closes them. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please ring 0345 464 0079 or send us an email.
Why choose Mr Mastic in Hayes
- A 12-month guarantee on all work
- 180+ five-star Google reviews
- Trusted Arbo and Everbuild sealants
- Fully insured
Take a look at how sealant jobs are priced or customer reviews.
Keeping the joints in good condition
So the new joints stay in good condition:
- Don’t run silicone over sand mastic
- Go gently near the mastic when preparing windows
- Check with your local planning authority if your home is listed
- Plan mastic work ahead of painting
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
Once mastic starts to crumble, rain gets in. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
What affects the cost of sand mastic
Call for a quick quote. What matters most is:
- How easy the joints are to reach
- Any working-time requirements on site
- How much old sealant there is and how hard it is to remove
- The number and length of the joints
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
What we need to know
When you contact us, these details help:
- Pictures of the joints, sent by email
- How we’d reach the joints
- Whether it’s a home or a business
- Whether it has been sealed before
If you’re in Hayes and need sand mastic, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before work begins.