Surrey · England
Green Cross Window Mastic
Window mastic for Green Cross and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Mastic that has split away from the wall
- Gaps between the frame and the inside reveal
- Untidy mastic left by window fitters
About our window mastic in Green Cross
Homes in Green Cross have every kind of window: uPVC, aluminium, timber and composite, plus patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. Typical jobs include cracked internal joints between frame and plaster and cold air getting in at the frame edge, across patio & French doors, uPVC windows and window sills.
Somewhere as small as Green Cross, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we will put it right.
- Where
- Green Cross (GU10)
- Wider area
- Surrey
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
The process
On the day, we start by going over the job with you, so you know exactly what we’re doing. We protect the surfaces around the joints before work begins. Most jobs take a few hours for a handful of frames, longer for a whole house. Somewhere as small as Green Cross, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Tell us about any water getting in
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Related advice
Places near Green Cross
What else we do in Green Cross
Questions from Green Cross
Will you come out to Green Cross?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
I let a flat near Haslemere station. Can you help?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Where do you work from?
We work from Crawley. Our applicators cover Green Cross.
Do you work on first-floor windows?
Generally, yes. We plan safe access before the job, so mention the height and anything in the way.
Can you match the sealant to my frames?
Yes, in most cases. Mention the frame colour when you ask for a quote and we will use the nearest match.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
Can new window sealant be painted?
Not if it’s silicone. Tell us your decorating plans and we will pick a sealant to suit.
Do you seal inside as well as outside?
Yes. Inside, the joint between frame and plaster is sealed neatly, using a paintable sealant if you want to decorate.
Looking after it afterwards
Good habits help new joints last longer. A few tips:
- Keep timber frames painted
- Make sure the drainage slots aren’t blocked
- Check the mastic once a year
- Do not use solvent cleaners on the joint
Most silicone sealants will not take paint, so mention any painting plans before work begins. We can use a paintable sealant where that matters.
Leaks usually show up in wet, windy weather, but resealing works best in dry conditions. Sorting cracked mastic early means the joint is sound before the bad weather.
Work for landlords, hotels and businesses
Letting agents and landlords in Green Cross can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Different surfaces, different methods
Timber windows & doors
Soft or rotten wood cannot be sealed successfully. If we find rot, we’ll tell you before going ahead, as that’s a job for a joiner.
Patio & French doors
Not every patio door leak is a mastic problem: blocked drain slots, worn brush seals and threshold details can let water in too. We look for the cause first.
DIY sealant or a professional job?
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, and the work is guaranteed for a year.
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
Window mastic in Green Cross: local notes
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For site and facilities teams at buildings such as St John's CofE Aided Infant School, its window and door frames need their mastic kept sound, just like a home’s. If you live in an older home near St John the Evangelist, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Letting a property close to Haslemere station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Green Cross is about 5 miles south of Farnham, in Surrey. Jobs in Green Cross get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Green Cross is one of 395 towns and villages in Surrey where we work for window mastic. We also work in Reading, about 24 miles from Green Cross.
Every address in GU10 is covered for window mastic. Other places close to Green Cross include 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). Within a short drive, we also cover 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).
Around Green Cross
Typical jobs here are in homes near Crossways Inn and The Flashes, among other places. The closest station to Green Cross is Haslemere station, roughly 3.7 miles south-east. A little further out are Haslemere and District Hospital (3.8 miles south-east). For a walk, there’s Gibbet Hill and Farnham Heath.
Why deal with it now?
Getting a straight, even bead on an outside frame takes practice, especially upstairs. A professional job is cut out properly, backed where needed and finished neatly, in a sealant suited to the wall. Older cottages and farmhouses around Green Cross can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first and agree the price before starting.
What you get with us
- Colour picked to suit the job
- Sanitary silicone with an anti-fungal additive in wet areas
- Fully insured
- Any old sealant cut out fully, not covered over
Honest limits
In fairness, there are a few things sealant won’t fix:
- A door that needs adjusting, rehanging or new seals
- Damp problems in the wall away from the window
- A failed sealed unit that has misted up
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think before booking.
What we seal
- Composite doors
- Window sills
- Patio & French doors
- uPVC windows
- Timber windows & doors
- Aluminium frames