Surrey · England
Sand mastic for sash & case windows in Horley, Surrey
Professional sand mastic in and around Horley, with old sealant always removed completely and a one-year guarantee.
- Mastic dropping out of the joint
- Draughty sash windows at the surround
- Cement or filler used on old window joints that has cracked
About our sand mastic in Horley
Fresh sand mastic forms a skin quite soon but full hardening takes longer. Traditional guidance is not to paint over it, so ask us before you decorate. We work on stone surrounds, tenement windows and brick reveals, and common reasons people get in touch are draughts and rain around sash boxes and patchy fillers round a sash window.
In a town like Horley, older houses sit alongside newer estates, with windows of every age. In every case, the joint between frame and wall is what keeps water out.
You get a one-year guarantee, the same in Horley as everywhere else we work.
- Location
- Horley (RH6)
- Region
- Surrey
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How the job changes by surface
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. We shape it by hand to follow the stone.
Period and listed homes
On a listed home or in a conservation area, the right material matters. Sand mastic is often the preferred finish.
Frames and glazing around Horley
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.
If you look after a building such as Horley Infant School, its window and door frames need their mastic kept sound, just like a home’s. If you let a flat or house near Horley station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Horley is about 5 miles north of Crawley, in Surrey. Horley gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our Surrey coverage runs to 395 places, Horley among them.
Work in RH6 is quoted and booked the same way as anywhere else. That includes homes and businesses on Station Road, High Street and Church Road. With the A23 and B2036 close by, Horley is easy for our applicators to reach. We also cover Hookwood (1 mile south-west), Fernhill (2 miles south-east), Burstow (2 miles south-east), Smallfield (2 miles east) and Shipley Bridge (2 miles south-east). Further out, we also cover Epsom (12 miles north), Redhill (4 miles north), Ewell (13 miles north), Reigate (4 miles north), Caterham (8 miles north-east) and Dorking (8 miles north-west). Horley is one of the larger places we cover in Surrey.
Around Horley
Around Horley, our work takes us to homes and buildings near The Bull pub and Oakwood School. The closest station to Horley is Horley station, about 0.8 miles south-east of the centre. Nearby you will also find Reigate Castle (4.5 miles north) and East Surrey Hospital (2.8 miles north). For a walk, there’s Reigate Heath.
Towns and villages near Horley
Also in Horley
What affects the cost of sand mastic
Jobs vary more than people expect. What affects the quote:
- Which sealant suits the joint
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- Any mould that needs treating
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we’ll explain what it covers.
What we need to know
Photos by email are helpful but not essential. Try to tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- If someone has resealed it before
- Photos by email, if that is easy
- Access, such as stairs, a lift or height
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved.
What we do, step by step
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 work begins. Most jobs take a few hours per window, depending on the condition of the joints. In Horley, parking is rarely complicated, though it helps to know about driveways or restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- Keep children and pets away from the work area
- Try not to wet indoor joints just before the visit
- Tell us about access, such as stairs, a lift or high-level joints
Get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Related advice
Aftercare tips
Aftercare is simple:
- Renew mastic before redecorating the windows
- Find out about consent before window work on a listed home
- Inspect the joints round the windows every year or so
- Leave the new mastic unpainted
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look before trying a quick fix.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
Honest limits
We’ll always be straight with you, so here’s what new sealant won’t do:
- Whether work needs listed building consent
- Sash cords, weights and draught-proofing of the sashes
- Decayed frames that need repair
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly.
What we seal
- Sash and case windows
- Period & listed homes
- Brick reveals
- Tenement windows
- Stone surrounds
- Timber door frames
FAQs for Horley
What guarantee comes with sand mastic in Horley?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Do you work for landlords with property near Horley station?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can go on one quote. You can phone 0345 464 0079 or email us with the details for a clear quote.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
What sealant do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We will tell you what we are using and why.
Can I add another job to the visit?
Yes. Just list everything you need and you will get one quote.
Do you cover Horley?
Yes, we do. Horley is part of the area we cover, and the service is the same as everywhere else.
How long does sand mastic take to go off?
A skin forms quite soon, but full hardening takes longer. We will explain what to expect before we leave.
Can you replace silicone on a period window with sand mastic?
In most cases. We remove the silicone and clean the joint, then point it with sand mastic.
Why act early in Horley
Filling over old, loose mastic doesn’t last. We remove the loose material first so the new work lasts. In Horley, as anywhere, most leaks start as a small gap in a joint, and early is when they’re cheapest and quickest to sort.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why choose Mr Mastic in Horley
- We never seal over old sealant
- We leave the area clean and tidy
- A 12-month guarantee on all work
- Fully insured
Read what affects the cost and our reviews.
Common problems we fix in Horley
Water gets into small cracks in the mastic and loosens it further. Windows facing the weather tend to go first.
These are the problems we’re asked about most:
- Silicone on a period window that looks wrong
- Cracked mastic round a front door frame
- Old sand mastic that has cracked, crumbled or fallen out
- Cement or filler used on old window joints that has cracked
If you live in an older home near St Wilfrid's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Comparing quotes
- Whether all the old sealant comes out first
- Who turns up on the day
- What guarantee comes with the work
- What preparation is included