West Sussex · England
Sand mastic for sash & case windows in Highbrook, West Sussex
We cover Highbrook for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly.
- A silicone bead on a sash window that spoils the look
- Wind and rain getting in round a sash window
- Failed mastic on an exposed elevation
Sand mastic in Highbrook
We renew sand mastic around sash windows and doors set in stone or brick. The old mastic is raked out, and new mastic is applied and shaped by hand. If you’re dealing with old sand mastic that has cracked, crumbled or fallen out and gaps round a timber door in stone or brick, we can help.
Outdoor sealant needs dry, clean surfaces, so work on frames around Highbrook is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Big or small, you get the same one-year guarantee.
- Where
- Highbrook (RH17)
- Region
- West Sussex
- Guarantee
- One year on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Your questions about sand mastic in Highbrook
Can you help a landlord with a rental near Balcombe station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just call 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear quote.
Is Highbrook within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you hold any approvals?
Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
Can old silicone round a sash window be swapped for sand mastic?
In most cases. The silicone is cut out and the joint cleaned before the sand mastic goes in.
Can you do several jobs on one visit?
Yes. Just list everything you need and we’ll quote it together.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Will there be a smell?
That depends on the sealant. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Nearby places to Highbrook
Also in Highbrook
Surface by surface
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We can do one window or several.
Brick reveals
We rake out the old mastic and pack deep voids before pointing.
What affects the quote in Highbrook
The quote reflects the job in front of us. We take into account:
- Whether the work is at height
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- When we can work, for business premises
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Helping us quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- The type of property
- Pictures of the joints, sent by email
- Where the property is
- What the problem is, such as mould, gaps, leaks or cracking
To get a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
How it works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take anything from a few hours to a full day, depending on how many windows. Somewhere as small as Highbrook, access is often the only tricky part. 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.
- Old, loose mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Getting ready for the visit
- Let us know about parking restrictions
- Mention any leaks or damp you’ve noticed
- Clear the area around the work
Get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Related advice
Frames and glazing around Highbrook
Historic houses like Priest House (about 1.5 miles north) are a reminder that the area around Highbrook 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. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like St Peter's CofE Primary School? Then the mastic around its windows and doors needs looking after like any other building’s. Rented homes near Balcombe station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
Highbrook is about 4 miles north-east of Haywards Heath, in West Sussex. Our applicators cover sand mastic for householders, landlords and businesses in Highbrook and the surrounding area. Our area takes in 371 places across West Sussex. You can also see our page for Crawley, roughly 7 miles from Highbrook.
Postcode districts we cover here for sand mastic: RH17. If you are just outside Highbrook, we cover Ardingly (1 mile south-west), Little London (1 mile west), Sharpthorne (2 miles north), West Hoathly (2 miles north) and Horsted Keynes (2 miles south-east). Within a short drive, we also cover Crawley (7 miles north-west), Horsham (11 miles west), Haywards Heath (4 miles south-west), Burgess Hill (7 miles south-west), East Grinstead (5 miles north) and Broadfield (7 miles north-west).
Around Highbrook
Around Highbrook, our work takes us to homes and buildings near The Ardingly Inn, among other places. The nearest railway station is Balcombe station, roughly 3.4 miles west of the centre. Well-known places in the area include Princess Royal Hospital (4.6 miles south) and Parish Museum (2.8 miles south). The countryside around Highbrook includes Blunts Wood and Paiges Meadow.
Why it’s worth doing now in Highbrook
Cement-based fillers and modern sealants don’t always suit a period surround. Sand mastic matches what was there, which can matter on listed and conservation-area homes. Around Highbrook, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs. Call for a quick quote and we’ll go through it with you.
What you get with us
- Experience in homes, commercial sites and hotels
- 180+ five-star Google reviews
- Tidy, careful work
- Sanitary silicone with an anti-fungal additive in wet areas
Read what affects the cost or what customers say.
When it isn’t the sealant
It helps to know what we can’t do too:
- Whether work needs listed building consent
- Masonry that needs repairing
- Putty and glazing repairs
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think.
Where we work in Highbrook
- Brick reveals
- Stone surrounds
- Sash and case windows
- Tenement windows
- Timber door frames
- Period & listed homes
Signs you need sand mastic in Highbrook
Sand mastic slowly weathers. It hardens, cracks and starts to come away on the stone or timber.
The most common problems we see are:
- Cracked mastic round a front door frame
- Wind and rain getting in round a sash window
- Mastic worn away on windows facing the weather
- Patchy fillers round a sash window
If you live in an older home near All Saints Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before you book anyone
- How the joint is cleaned and prepared
- What the quote includes, VAT included or not
- How long the guarantee is
- How hidden problems are handled
Aftercare tips
A little care helps the new joints last. We recommend:
- Ask us before painting near the mastic
- Clear gutters so water doesn’t pour onto the windows
- Check with your local planning authority if your home is listed
- Check the mastic when you check the paintwork
Avoid sealing over the mastic with silicone. If anything cracks, get it looked at rather than patching it.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry so early renewal protects both.