Surrey · England
Sand mastic for sash & case windows in Fernhurst, Surrey
Sand mastic across Fernhurst and nearby, with every bit of old sealant taken out first.
- Cement or filler used on old window joints that has cracked
- Modern sealant on a period surround
- Old sand mastic that has cracked, crumbled or fallen out
What we’re called out for in Fernhurst
Water gets into small cracks in the mastic and loosens it further. Exposed elevations generally fail first.
Most people get in touch when they notice one of these:
- Window mastic to renew ahead of painting
- Mastic round period door frames that has failed
- Modern sealant on a period surround
- Crumbling sand mastic round a window
Rented homes near Haslemere station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
What to look for in a quote
- Whether you can choose the colour
- What happens if they find a problem under the old sealant
- The length of the guarantee
- How the surfaces are prepared before sealing
About our sand mastic in Fernhurst
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditional guidance is not to paint over it and we will advise if you are redecorating. If you’re dealing with wind and rain getting in round a sash window and a silicone bead on a sash window that spoils the look, we can help, on period & listed homes, stone surrounds and tenement windows alike.
Outdoor sealant needs dry, clean surfaces, so work on frames around Fernhurst is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
All our work is covered by a one-year guarantee.
- Location
- Fernhurst (GU27)
- Wider area
- Surrey
- Guarantee
- A year, on every job
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How to look after the new joints
Aftercare is simple, and it makes a real difference:
- Go gently near the mastic when preparing windows
- Renew mastic before redecorating the windows
- Clear gutters so water does not pour onto the windows
- Ask a joiner to look at soft timber first
Leave the new mastic alone while it firms up. It skins over quickly but needs longer to fully harden.
Good mastic helps keep the frame dry. Failed mastic lets water reach the timber, which can lead to rot.
What happens on the day
You do not need to clear the whole room or building, only the area right around the joints. Everything nearby is protected, and the job takes anything from a few hours to a full day, depending on how many windows for a typical job. Somewhere as small as Fernhurst, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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 is not too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
Getting ready for the visit
- Mention any parking rules near the property
- For business premises, tell us about site rules or sign-in
- Move anything stored near the joints
Getting a quote
For a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Advice
Leave it or put it right?
Replacing sash windows is a big decision for a period home, and in listed buildings it may need consent. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Older cottages and farmhouses around Fernhurst can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Doing several joints on one visit usually makes better use of the time than several visits. We will send you a clear quote for the lot.
Why us?
- Anti-fungal sanitary silicone in wet areas
- Fully insured
- 12-month guarantee on every job
- Rated 4.9 stars on Google
Take a look at what affects the cost and customer reviews.
Frames and glazing around Fernhurst
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Cowdray House (about 4.3 miles south) are a reminder that the area around Fernhurst has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Schools such as Fernhurst Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. Homes close to The Parish Church of St Margaret include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Fernhurst is about 10 miles east of Petersfield, in Surrey. From the centre of Fernhurst to the outskirts, sand mastic is available for homes and businesses alike. Our area takes in 395 places across Surrey, large and small. Portsmouth is on our list too, about 23 miles from Fernhurst.
Jobs for sand mastic in GU27 works the same way as everywhere else we cover. Whether your property is on Church Road, Merle Way and Bishops Close or a nearby road, our applicators can take on the job. We also cover the places around Fernhurst: Kingsley Green (1 mile north), Woolmer Hill (2 miles north-west), Linchmere (2 miles north-west), Redford (3 miles south-west) and Haslemere (3 miles north). We also work in nearby towns such as Guildford (15 miles north-east), Farnham (11 miles north), Cranleigh (12 miles north-east), Ash (14 miles north), Godalming (10 miles north-east) and Farncombe (11 miles north-east).
Near you in Fernhurst
The closest station to Fernhurst is Haslemere station, roughly 2.7 miles north of the centre. A little further out are Haslemere and District Hospital (2.9 miles north). Green spaces nearby include Blackdown and Cooksbridge Meadow.
What we can’t put right
Sealant isn’t the answer to every problem, and we’ll tell you before work begins. Sealant will not put right:
- Decayed frames that need repair
- Broken panes
- Sashes that rattle, stick or won’t open
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think.
Joints and surfaces we work on
- Stone surrounds
- Sash and case windows
- Brick reveals
- Period & listed homes
- Tenement windows
- Timber door frames
Surface by surface
Sash and case windows
Sash windows are where we do most sand mastic work. We renew the mastic round each box.
Stone surrounds
Stone openings are rarely perfectly straight, so the joint varies in width. We shape it by hand to follow the stone.
Questions from Fernhurst
Can you help a landlord with a rental near Haslemere station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Do you cover Fernhurst for sand mastic?
Yes, Fernhurst is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or send us an email and tell us what needs doing, and we’ll give you a clear price.
Can new sealant go over the old?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
What does sand mastic cost?
Every job is different, so each one gets its own quote. To get one, call 0345 464 0079 or email us with a short description of the job.
What sealant do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
Can you quote for more than one area?
Yes. Several rooms, windows or areas can go on one quote.
Should I use sand mastic or silicone?
That depends on your windows. Period windows in stone or brick generally suit sand mastic, while modern frames normally get a flexible sealant.
How long does the job take?
That depends on how much there is to do, but most jobs take a few hours per window, depending on the condition of the joints. We will tell you when we quote.
Can I do it myself?
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.