Greater London · England
Sand Mastic in Headstone
Sand mastic in Headstone from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Window mastic to renew ahead of painting
- Old sand mastic that has cracked, crumbled or fallen out
- Draughty sash windows at the surround
How we handle sand mastic in Headstone
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. Out comes the old, loose mastic, and new mastic is applied and shaped by hand. We work on stone surrounds, brick reveals and tenement windows, and people most often call us about mastic dropping out of the joint and gaps where the frame meets the masonry.
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.
You get a one-year guarantee, the same in Headstone as everywhere else we work.
- Location
- Headstone (HA5, HA3, HA2)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Aftercare tips
Aftercare is simple:
- Leave the new mastic unpainted
- Look over the window mastic once a year
- Get any rot dealt with first
- Ask the planning authority about consent for listed or conservation-area homes
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.
What we do, step by step
There isn’t much for you to do on the day. Point us to the joints and we’ll get on with it. The work itself takes a few hours for a single window, longer for several, including the tidy-up. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Headstone. A visitor permit or a nearby bay makes the visit run more smoothly.
- 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.
How to prepare
- Let us know about earlier repairs to the joints
- For indoor joints, keep the area dry beforehand if you can
- Clear items away from the joints we are working on
Ask for a quote
Asking for a quote is easy: tell us what needs doing and where and its rough size. Photos by email help us understand the job.
Read more
Windows and doors in Headstone
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.
For site and facilities teams at buildings such as Pinner Park Primary School, the mastic around its windows and doors needs looking after like any other building’s. Headstone Manor, about 0.6 miles south-east, is one of the historic houses in the wider area around Headstone. For landlords with property near Headstone Lane station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Headstone is about 1 mile east of Hatch End, in Greater London. Anywhere in HA5, we cover sand mastic for homes and businesses. Headstone is one of 764 towns and villages in Greater London we cover for sand mastic. We also work in London, around 14 miles away.
Every address in HA5, HA3 and HA2 is within our area for sand mastic. We cover properties on Anselm Road, Ufford Road and Chantry Road. Nearby, we also carry out sand mastic in Hatch End (1 mile west), Harrow Weald (1 mile east), South Oxhey (2 miles north-west), Belmont (2 miles east) and Carpenders Park (2 miles north-west). Larger places within reach include London (14 miles south-east), City of Westminster (11 miles south-east), Marylebone (11 miles south-east), Kensington (10 miles south-east), St Pancras (12 miles south-east) and Shoreditch (13 miles south-east).
Local landmarks in Headstone
Around Headstone, our work takes us to homes and buildings near The Moon & Sixpence pub, Hatch End High School and Headstone Manor Recreation Ground and the streets around them. Headstone has its own railway station: Headstone Lane station. Well-known places in the area include Hilfield Castle (3.8 miles north) and Kodak Museum (1 mile south-east). The countryside around Headstone includes Harrow Weald Common and Northala Fields.
Surface by surface
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
Brick reveals
An open joint at a brick reveal lets weather in. New mastic seals the gap.
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
Quotes for sand mastic in Headstone
Every job gets its own quote. These are the things that affect it:
- How much old sealant there is and how hard it is to remove
- How easy the joints are to reach
- When we can work, for business premises
- Mould in or behind the old joints
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
What to tell us for a quote
Photos by email are helpful but not essential. Try to tell us:
- Where the job is, and your postcode
- Photos by email, if that’s easy
- If someone has resealed it before
- How we’d reach the joints
Need a quote? Please call 0345 464 0079 or drop us an email and tell us about the job. We’ll explain what we’d do and send you a clear quote before we start.
When it is not the sealant
We’ll always be straight with you, so here’s what new sealant will not do:
- Damaged stone surrounds
- Sashes that rattle, stick or won’t open
- Decisions on consent for listed homes
Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly.
Where we work in Headstone
- Tenement windows
- Sash and case windows
- Stone surrounds
- Brick reveals
- Period & listed homes
- Timber door frames
Towns and villages near Headstone
What else we do in Headstone
FAQs for Headstone
Is Headstone in your area for sand mastic?
Yes, Headstone is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear quote.
Can you help a landlord with a rental near Headstone Lane station?
Yes, we work for landlords and letting agents. Just ring 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear price.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
Is consent needed for window work on a listed home?
Speak to your local planning authority before work starts. Sand mastic is often favoured as like for like, but they decide.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses and we’re fully insured.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
What do you put in the joint?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.