Surrey · England
Forest Green Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Forest Green, backed by a 12-month guarantee. Ask us for a quote.
- A silicone bead on a sash window that spoils the look
- Mastic that needs renewing before redecorating
- Patchy fillers round a sash window
Sand mastic in Forest Green
Burnt sand mastic is a traditional material blends with stone and brick surrounds. It’s a good fit for period properties, where modern sealant can look out of place. We work on sash and case windows, tenement windows and stone surrounds, and people most often call us about failed mastic on an exposed elevation and mastic round period door frames that has failed.
In a village or hamlet like Forest Green, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
Each job carries a 12-month guarantee, large or small.
- Location
- Forest Green (RH5)
- Region
- Surrey
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What happens if it’s left?
New sash windows are a major, costly change, and in listed buildings it may need consent. Where the frames are in good order, new mastic seals the surround. Around Forest Green, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Doing several joints on one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
Why us?
- 20+ years of sealant experience
- A 12-month guarantee on all work
- Tidy, careful work
- Full insurance on every job
See our cost guide or our reviews.
Work for landlords, hotels and businesses
For anyone letting property in or around Forest Green, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Sash cords, weights and draught-proofing of the sashes
- Putty and glazing repairs
- Timber that has rotted
If in doubt, call 0345 464 0079 or send us an email and we will say what we think.
Surfaces we seal
- Period & listed homes
- Stone surrounds
- Sash and case windows
- Timber door frames
- Brick reveals
- Tenement windows
What we are called out for in Forest Green
Paint, silicone or cement used over old mastic causes problems. They don’t move with the timber, and they normally need raking out.
Any of these means the joints need attention:
- Mastic that needs renewing before redecorating
- Weathered mastic on the most exposed windows
- Mastic round period door frames that has failed
- Mastic dropping out of the joint
If you let a flat or house near Ockley station, any sash windows need sound mastic to keep draughts and rain out.
Before you book anyone
- What happens if the job turns out different
- Whether you can choose the colour
- Who does the work, and how experienced they are
- Which sealant they’ll use, and why
Looking after it afterwards
To keep the joints looking good and working properly:
- Ask a joiner to look at soft timber first
- Make sure water runs off the sill
- Leave the new mastic unpainted
- Check the mastic when you check the paintwork
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
An open joint round the box lets weather through. Left, the gap tends to get bigger.
Forest Green questions
Is Forest Green within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you do sand mastic in Forest Green?
Yes, Forest Green is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Is consent needed for window work on a listed home?
Speak to your local planning authority before work starts. Like-for-like sand mastic is often the preferred finish, but they decide.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Forest Green and the rest of Surrey, along with the rest of our area.
What’s sand mastic made of?
Sand plus a binder based on linseed oil. It’s built up in the joint by hand and finished to sit neatly against the masonry.
Are you fully insured?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
Can tenants book the work?
We’re happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
What sand mastic looks like in Forest Green
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as Holy Trinity, the joint between an old wall and a newer frame is usually the first place rain gets in.
Forest Green is about 6 miles south-west of Dorking, in Surrey. Across the RH5 area, we cover sand mastic for homes and businesses. Our area takes in 395 places across Surrey, from the larger towns to small villages. Our Crawley page covers work nearby.
All of RH5 is within our area for sand mastic. Whether your property is on Horsham Road and Ockley Road or anywhere close by, we can help. We also cover the places around Forest Green: Ockley (2 miles south-east), Abinger Bottom (2 miles north), Coldharbour (2 miles north-east), Friday Street (3 miles north) and Abinger Common (3 miles north). Larger places within reach include Guildford (10 miles north-west), Woking (13 miles north-west), Epsom (13 miles north-east), Horley (10 miles east), Redhill (11 miles north-east) and Ewell (15 miles north-east).
Local landmarks in Forest Green
We work in homes and buildings around The Parrot pub and Wallis Wood, among other places. The nearest railway station is Ockley station, roughly 2.6 miles east of the centre. Other landmarks nearby include Abinger Castle (2.9 miles north) and Mesolithic Museum (2.9 miles north). Open spaces near Forest Green include Leith Hill and Vann Lake.
How the visit works
Good joint work is mostly preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours for a single window, longer for several. In a small place like Forest Green, access is generally the main thing to plan. 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.
- The loose and crumbling 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.
- The mastic is finished to sit tidily against the stone or brick.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Try not to wet indoor joints just before the visit
- Mention if the joints have been sealed before
How to get a quote
Want a quote for sand mastic? Please call 0345 464 0079 or email us with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
Places near Forest Green
What else we do in Forest Green
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.