Surrey · England
Sand mastic for sash & case windows in Walton-on-Thames, Surrey
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Walton-on-Thames and across Surrey. Fully insured, ARBOMaster approved and guaranteed for a year.
- Gaps where the frame meets the masonry
- Draughts and rain around sash boxes
- Patchy fillers round a sash window
Sand mastic in Walton-on-Thames, done properly
If your home is listed or in a conservation area, check with your local planning authority whether consent is needed for work to windows. Like-for-like sand mastic is often the preferred finish. If you’re dealing with draughts and rain around sash boxes and weathered mastic on the most exposed windows, we can help.
In a town like Walton-on-Thames, the windows on the most exposed side of a house take the brunt of the rain, so the mastic there tends to fail first. Checking every frame, not just the obvious one, is time well spent.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Location
- Walton-on-Thames (KT12, KT13)
- Region
- Surrey
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Can I do it myself?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
Keeping the joints in good condition
Aftercare is simple, and it makes a real difference:
- Avoid heavy scraping on the mastic joint
- Ask a joiner to look at soft timber first
- Do not run silicone over sand mastic
- Renew mastic before redecorating the windows
Avoid painting over the new mastic, which is the traditional advice. Ask us before any decorating around it.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens as more mastic falls out.
What affects the cost of sand mastic
For a quick quote, just ask. The main things that affect it are:
- Which sealant suits the joint
- Access and height
- Any mould that needs treating
- Whether old sealant or filler has to be cut out
What it costs depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before any work starts, so you know where you stand.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- What’s wrong with the joints now
- Whether it’s a home or a business
- Any access issues, like height or stairs
- Photos by email, if that is easy
Getting a quote is simple: let us know what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.
Landlord and commercial work in Walton-on-Thames
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
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.
Sand mastic in Walton-on-Thames: local notes
Historic houses like The Homewood (about 2.5 miles south) are a reminder that the area around Walton-on-Thames 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’s traditional sand mastic. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near Walton-On-Thames station, older sash windows in a rental need their mastic kept sound to keep the weather out. Managing a site like Walton Oak Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
Walton-on-Thames is about 9 miles north-east of Woking, in Surrey. Jobs in Walton-on-Thames get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. 395 places in Surrey are on our list, large and small. London is on our list too, about 16 miles from Walton-on-Thames.
Jobs for sand mastic in KT12 and KT13 is quoted and booked the same way as anywhere else. You will find streets such as High Street, Sidney Road and Stuart Avenue. Main roads around Walton-on-Thames include the A244 and B365, so getting to you is simple. We also cover the places around Walton-on-Thames: Hersham (1 mile south), Shepperton (2 miles north-west), Burwood Park (2 miles south-west), Weybridge (2 miles south-west) and St George's Hill (2 miles south-west). Within a short drive, we also cover Guildford (12 miles south-west), Woking (9 miles south-west), Camberley (14 miles west), Epsom (7 miles south-east), Redhill (14 miles south-east) and Ewell (7 miles east).
Around Walton-on-Thames
In Walton-on-Thames, that means homes and buildings near RES Sixth Form College and Sunbury Park and the streets around them. Walton-on-Thames’s nearest station is Walton-On-Thames station, roughly 0.8 miles south of the centre. A little further out are Elmbridge Museum (2.2 miles south-east) and No. 2 New Zealand General Hospital (0.8 miles west). Green spaces nearby include Kempton Park Reservoirs and Ferris Meadow Lake.
Common questions in Walton-on-Thames
Can you help a landlord with a rental near Walton-On-Thames station?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can go on one quote. You can call 0345 464 0079 or email us with the details for a clear quote.
Do you cover Walton-on-Thames for sand mastic?
Yes, Walton-on-Thames is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing, and we’ll send you a clear quote.
Can I choose the sealant colour?
We help you choose a colour that suits. The product needed can limit the range.
Is it possible to paint over sand mastic?
Traditional guidance is not to paint over sand mastic. If you’re redecorating the window, ask us first and we will talk you through it.
Will there be a smell?
There can be a smell while the sealant cures, but it fades. Opening a window helps.
Should I try DIY first?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Leave it or put it right?
Cement-based fillers and modern sealants don’t always suit a period surround. Sand mastic is the like-for-like choice, which can matter on listed and conservation-area homes. Draughts from a gap round a frame, damp under a sill or water behind a bath panel all start small, and early is when they’re cheapest and quickest to sort.
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first.
What you get with us
- Anti-fungal sanitary silicone in wet areas
- ARBOMaster approved applicator
- 20+ years of sealant experience
- Any old sealant cut out fully, not covered over
Read what affects the cost and what customers say.
Common problems we fix in Walton-on-Thames
Rain on the window surround works into any crack and loosens it further. Exposed elevations generally fail first.
People normally contact us after spotting something like this:
- Patchy fillers round a sash window
- Weathered mastic on the most exposed windows
- Tired mastic found when preparing windows for paint
- Gaps where the frame meets the masonry
In the older streets around St John, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Before you book anyone
- How long to leave it before use
- Whether all the old sealant comes out first
- What guarantee comes with the work
- Who does the work, and how experienced they are
Also near Walton-on-Thames
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What happens on the day
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 anything from a few hours to a full day, depending on how many windows, including the tidy-up. Parking in a town like Walton-on-Thames is generally straightforward, but tell us if there’s a driveway or any restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know about earlier repairs to the joints
Get a quote
To get a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. We will send you a clear quote before any work starts.