Surrey · England
Sand mastic for sash & case windows in Fernhill, Surrey
Sand mastic across Fernhill and nearby, with old sealant always removed completely and a 12-month guarantee.
- Failed mastic on an exposed elevation
- Wind and rain getting in round a sash window
- Patchy fillers round a sash window
About our sand mastic in Fernhill
We renew sand mastic around sash windows and doors set in stone or brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. Common call-outs are for cracked mastic round a front door frame and old cement repairs round a window that have failed, across stone surrounds, period & listed homes and timber door frames.
Around Fernhill, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we will put it right.
- Place
- Fernhill (RH6)
- Wider area
- Surrey
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How it works
We work through the job in order: protect, prepare, seal, tidy. Typically it takes a few hours for a single window, longer for several. Somewhere like Fernhill needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- First, we look at the surrounds with you and agree what needs doing.
- Old, loose 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.
- The finish is dressed so it sits neatly against the stone or brick.
Before we arrive
- Mention any parking rules near the property
- Tell us about access, such as stairs, a lift or high-level joints
- Keep pets and children clear of the area while we work
Get a quote
If you are in Fernhill and need sand mastic, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and you will get a clear quote before work begins.
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What affects the cost of sand mastic
You will get a clear quote before we start. It takes into account:
- How many rooms, windows or areas are involved
- How easy the joints are to reach
- Any mould that needs treating
- The number and length of the joints
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
Asking for a quote
Photos help, but a description is a good start. Please mention:
- How we’d reach the joints
- If someone has resealed it before
- If it’s domestic, commercial or a hotel
- Roughly how big the job is
Want a quote for sand mastic? Please ring 0345 464 0079 or send us an email and tell us about the job. We’ll explain what we’d do and give you a clear quote before we start.
What we can’t put right
To be straight with you, some problems need a different trade:
- Sash cords, weights and draught-proofing of the sashes
- Whether work needs listed building consent
- Masonry that needs repairing
If you’re not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- Sash and case windows
- Period & listed homes
- Stone surrounds
- Brick reveals
- Tenement windows
- Timber door frames
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
If you’ve already had a go yourself, that is fine. We cut it out and start again.
What sand mastic looks like in Fernhill
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Oakwood School? Then its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to Gatwick Airport station? Then older sash windows in a rental need their mastic kept sound to keep the weather out. For an older house near a landmark such as Church of St Bartholomew, the joint between an old wall and a newer frame is generally the first place rain gets in.
Fernhill is about 2 miles south-east of Horley, in Surrey. If you need sand mastic in Fernhill, it’s easy to get a quote: please call 0345 464 0079 or drop us an email. We’re based in Crawley and cover Surrey. 395 places in Surrey are on our list, large and small.
Every address in RH6 is within our area for sand mastic, from the main roads to the quietest streets. You’ll find streets such as Peeks Brook Lane and Donkey Lane. We also cover the places around Fernhill: Burstow (1 mile east), Shipley Bridge (1 mile south), Tinsley Green (1 mile south-west), Keeper's Corner (1 mile east) and Copthorne (1 mile south). Further out, we also cover Epsom (14 miles north-west), Redhill (6 miles north), Ewell (15 miles north), Reigate (6 miles north-west), Caterham (9 miles north) and Dorking (10 miles north-west).
Around Fernhill
Around Fernhill, our work takes us to homes and buildings near The Shipley Bridge pub, among other places. The nearest railway station is Gatwick Airport station, roughly 1 mile west of the centre. Nearby you’ll also find County Mall (3.6 miles south-west) and Langley Green Hospital (2.9 miles south-west). Open spaces near Fernhill include Hedgecourt Lake.
Your questions about sand mastic in Fernhill
Will you come out to Fernhill?
Yes. Fernhill is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you work for landlords with property near Gatwick Airport station?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can be quoted together. Just ring 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear quote.
Is it OK to seal over old sealant?
No, it will not last. 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.
Are you fully insured?
Yes. We’re fully insured.
What information do you need?
Just the basics: where it is, what you’ve noticed and how we reach it. Then phone 0345 464 0079 or send us an email.
Do you work for hotels and businesses?
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.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint before resealing.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We’ll tell you what we are using and why.
Nearby places to Fernhill
Other services in Fernhill
Landlords, agents and businesses in Fernhill
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
What happens if it’s left?
If you’re redecorating, renew the mastic first. Paint over cracked mastic won’t stop the gaps and traditional guidance is to leave the new mastic unpainted. Older cottages and farmhouses around Fernhill can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part, and we will explain the quote if you ask.
Why book with us
- Quality sealants from Arbo and Everbuild
- A 12-month guarantee on all work
- 4.9 on Google from 180+ five-star reviews
- Homes, businesses and hotels
Take a look at how sealant jobs are priced and our reviews.
Aftercare tips
So the new joints stay in good condition:
- Make sure water runs off the sill
- Don’t run silicone over sand mastic
- Ask the planning authority about consent for listed or conservation-area homes
- Look over the window mastic once a year
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger.