Surrey · England
Sand mastic for sash & case windows in Green Cross, Surrey
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Green Cross, backed by a one-year guarantee. Call for a quick quote.
- Modern sealant on a period surround
- Mastic that needs renewing before redecorating
- Draughty sash windows at the surround
Sand mastic in Green Cross, done properly
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditionally, sand mastic is left unpainted, so ask us before you decorate. We work on stone surrounds, brick reveals and timber door frames, and common reasons people get in touch are draughty sash windows at the surround and gaps where the frame meets the masonry.
Around Green Cross, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
Every job is covered by a 12-month guarantee, wherever you are in Surrey.
- Location
- Green Cross (GU10)
- Wider area
- Surrey
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Green Cross questions
Will you come out to Green Cross?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
I let a flat near Haslemere station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear quote.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status.
Can you seal over the old sealant?
No, it will not last. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
What is sand mastic?
Sand plus a binder based on linseed oil. It’s applied by hand and shaped to suit the surround.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
Will you leave a mess?
No. The area is protected while we work and cleaned up afterwards.
Is it possible to take out silicone and use sand mastic instead?
Often, yes. With the silicone removed and the joint cleaned we point it with sand mastic.
Green Cross homes and the weather
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as St John's CofE Aided Infant School, larger buildings have plenty of frames, and the mastic around each one ages. Homes close to St John the Evangelist include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in.
Green Cross is about 5 miles south of Farnham, in Surrey. If you need sand mastic in Green Cross, it’s easy to get a quote: please phone 0345 464 0079 or email us. We cover Surrey from our Crawley base. Green Cross is one of 395 towns and villages in Surrey where we work for sand mastic. Reading is on our list too, around 24 miles away.
Jobs for sand mastic in GU10 is quoted and booked the same way as anywhere else. Nearby, we also carry out sand mastic in Churt (1 mile west), Whitmoor Vale (1 mile south-west), Beacon Hill (1 mile south-east), Barford (1 mile south-west) and Crosswater (1 mile north-west). We also work in nearby towns such as Guildford (11 miles north-east), Woking (15 miles north-east), Camberley (14 miles north), Farnham (5 miles north), Frimley (12 miles north) and Haslemere (4 miles south-east).
Local landmarks in Green Cross
We work in homes and buildings around Crossways Inn and The Flashes and the streets around them. Green Cross’s nearest station is Haslemere station, about 3.7 miles south-east. Nearby you’ll also find Haslemere and District Hospital (3.8 miles south-east). Green spaces nearby include Gibbet Hill and Farnham Heath.
Should I try it myself first?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Why deal with it now?
Replacing sash windows is a big decision for a period home and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. In a small place like Green Cross, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
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 make a difference, and we’ll explain the quote if you ask.
Why book with us
- 20+ years of sealant experience
- Sanitary silicone with an anti-fungal additive in wet areas
- Full insurance on every job
- Rated 4.9 stars on Google
Surface by surface
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
How we quote for sand mastic
You will get a clear quote before work begins. It takes into account:
- Whether there’s mould to deal with
- How much there is to do
- When we can work, for business premises
- The number of rooms or windows
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote and we will talk you through it.
Helping us quote
To help us quote quickly, please include:
- The problem you’ve noticed
- If someone has resealed it before
- Pictures of the joints, sent by email
- The type of property
Getting a quote is simple: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we will take it from there.
When to call us in Green Cross
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
The most common problems we see are:
- Mastic that needs renewing before redecorating
- Open joints round the window box
- Weathered mastic on the most exposed windows
- Cement or filler used on old window joints that has cracked
If you let a flat or house near Haslemere station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Comparing quotes
- Is the old sealant removed completely?
- What product goes in the joint
- Who turns up on the day
- What the quote includes, VAT included or not
Places near Green Cross
Also in Green Cross
The process
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, do the work and tidy away. Most jobs take anything from a few hours to a full day, depending on how many windows. Somewhere as small as Green Cross, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- We dress the surface so it sits neatly against the masonry.
Preparing for the visit
- Let us know about parking restrictions
- For business premises, tell us about site rules or sign-in
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
To get 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 price before any work starts.
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What sealant work cannot fix
To be straight with you, some problems need a different trade:
- Cracked or broken glass
- Damaged stone surrounds
- Whether work needs listed building consent
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer before you book.
What we seal
- Stone surrounds
- Sash and case windows
- Brick reveals
- Period & listed homes
- Timber door frames
- Tenement windows