Surrey · England
Sand mastic for sash & case windows in Windlesham, Surrey
Window and door surrounds in Windlesham need attention? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Gaps between timber frames and stone or brick
- Gaps round a timber door in stone or brick
- Weathered mastic on the most exposed windows
Sand mastic in Windlesham
A silicone bead around a sash window can look out of place and doesn’t suit the building. Sand mastic gives a finish that matches the age of the house and we can swap the silicone for it. If you have window mastic to renew ahead of painting and mastic dropping out of the joint, we can help.
Many houses in smaller places like Windlesham have conservatories, garden rooms or patio doors. Those joints need the same attention as the main windows, and any older timber or sash windows need a sealant that suits them.
You get a one-year guarantee, the same in Windlesham as everywhere else we work.
- Where
- Windlesham (GU20)
- Region
- Surrey
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
When it isn’t the sealant
To be straight with you, some problems need a different trade:
- Whether work needs listed building consent
- Rotten sashes, sills or window boxes (a joiner’s job)
- Masonry that needs repairing
If you are not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer before you book.
What we seal
- Timber door frames
- Period & listed homes
- Brick reveals
- Stone surrounds
- Sash and case windows
- Tenement windows
Windlesham: your questions answered
I let a flat near Bagshot station. Can you help?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Can you do sand mastic in Windlesham?
Yes, Windlesham is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
What’s sand mastic made of?
Sand plus a binder based on linseed oil. It’s applied by hand and finished to sit neatly against the masonry.
How long does the job take?
Most jobs take a few hours for a single window, longer for several, including the preparation. Your quote will say how long we expect yours to take.
Can you match the sealant colour?
We help you choose a colour that suits, from white and clear to greys and other shades. The product needed can limit the range.
Can you replace silicone on a period window with sand mastic?
Yes, we do this often. All the old silicone is removed first so the mastic can sit properly.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us.
What information do you need?
Just the basics: where it is, what you’ve noticed and how we reach it. Then ring 0345 464 0079 or drop us an email.
How it works
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes anything from a few hours to a full day, depending on how many windows. For a job in Windlesham, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Getting ready for the visit
- Let us know about parking restrictions
- Tell us about any previous sealing or DIY attempts
- Clear the area around the work
How to get a quote
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job, and we will come back to you with a quote.
Related advice
Why it’s worth doing now in Windlesham
Filling over old, loose mastic does not last. Raking out and preparing the joint gives it a sound base so the new work lasts. In an older home around Windlesham, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
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’ll explain the quote if you ask.
Why Windlesham customers choose us
- Fully insured
- Experience in homes, commercial sites and hotels
- 20+ years of sealant experience
- Quality sealants from Arbo and Everbuild
Aftercare tips
A little care helps the new joints last. We recommend:
- Avoid heavy scraping on the mastic joint
- Ask a joiner to look at soft timber first
- Ask the planning authority about consent for listed or conservation-area homes
- Don’t run silicone over sand mastic
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
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.
How we quote for sand mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- How many areas need sealing
- Any working-time requirements on site
- The size of the job
- Which sealant suits the joint
Doing several joints on one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. We will give you a clear quote for the lot.
Asking for a quote
There’s no need for technical detail. Just tell us:
- If someone has resealed it before
- Photos by email, if that is easy
- Any access issues, like height or stairs
- The type of property
For sand mastic in Windlesham, ring 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before any work starts.
Common problems we fix in Windlesham
Shallow joints are a common cause. Mastic that’s too thin cracks and drops out so we make sure the new mastic is the right thickness.
The most common problems we see are:
- Window mastic to renew ahead of painting
- Mastic round period door frames that has failed
- Old sand mastic that has cracked, crumbled or fallen out
- Wind and rain getting in round a sash window
Managing a site like Windlesham Village Infant School? Then the mastic around its windows and doors needs looking after like any other building’s.
Comparing quotes
- When the joint can take water or movement
- Who turns up on the day
- How long the guarantee is
- What happens if they find a problem under the old sealant
DIY versus a professional finish
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly.
Also near Windlesham
Other services in Windlesham
Windlesham homes and the weather
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For an older house near a landmark such as Church of St John the Baptist, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Letting a property close to Bagshot station? Then any sash windows need sound mastic to keep draughts and rain out.
Windlesham is about 4 miles north-east of Camberley, in Surrey. Wherever you are in the GU20 postcode area, we cover sand mastic for homes and businesses. 395 places in Surrey are on our list, large and small. We also work in Reading, about 15 miles from Windlesham.
All of GU20 is within our area for sand mastic, from the main roads to the quietest streets. Whether your property is on Church Road, Finney Drive and Cooper Road or anywhere close by, we can help. Neighbouring places we cover for sand mastic include Brick Hill (1 mile east), Lightwater (1 mile south-west), Bagshot (2 miles west), Donkey Town (2 miles south) and Broomhall (2 miles north-east). Larger places within reach include Guildford (9 miles south-east), Woking (5 miles south-east), Camberley (4 miles south-west), Farnham (12 miles south-west), Egham (6 miles north-east) and Walton-on-Thames (11 miles east).
Near you in Windlesham
We work in homes and buildings around The Sun pub, Brentmoor Heath and Gordon's School. For rail, the closest station is Bagshot station, roughly 1.4 miles west of the centre. Other landmarks nearby include Chobham Museum (2.6 miles south-east) and Heatherwood Hospital (3.3 miles north-west). Not far away are Gracious Pond and Virginia Water Lake.