West Sussex · England
Saint Hill Green Sand Mastic
Problem with your window and door surrounds in Saint Hill Green? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- A silicone bead on a sash window that spoils the look
- Old cement repairs round a window that have failed
- Open joints round the window box
Sand mastic in Saint Hill Green, done properly
Burnt sand mastic is a traditional material that sits naturally against stone and brick. It’s a good fit for period properties where a modern sealant bead would stand out. If you are dealing with crumbling sand mastic round a window and wind and rain getting in round a sash window, we can put it right, on tenement windows, timber door frames and period & listed homes alike.
Somewhere as small as Saint Hill Green, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, so the sealant has to be chosen to suit the building.
There’s a 12-month guarantee on every job, large or small.
- Where
- Saint Hill Green (RH19)
- Region
- West Sussex
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How it works
We keep the work tidy and contained to the area we’re working on, so you can carry on as normal. Expect the work to take a few hours per window, depending on the condition of the joints, and we tell you how long to leave it before we go. In a small place like Saint Hill Green, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Mention any parking rules near the property
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
Want a quote for sand mastic? Please call 0345 464 0079 or send us an email with a few details. We will explain what we’d do and give you a clear quote before we start.
Advice
Landlords, agents and businesses in Saint Hill Green
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together, and we’re fully insured for the work.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Aftercare tips
Joint life depends on how it’s used and looked after. We suggest:
- Clear gutters so water doesn’t pour onto the windows
- Avoid heavy scraping on the mastic joint
- Find out about consent before window work on a listed home
- Leave the new mastic unpainted
Do not run silicone over the new mastic. If anything cracks, get it looked at before trying a quick fix.
Good mastic helps keep the frame dry. Failed mastic lets water reach the timber and timber that stays wet can rot.
Surface by surface
Tenement and terrace windows
Windows above ground floor need the right access. Let us know the floor and we will confirm access.
Stone surrounds
The stone is treated with care when the old mastic comes out.
DIY sealant or a professional job?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
How we quote for sand mastic
We quote each job individually. These are the things that affect it:
- The old material and how stubborn it is
- The type of sealant required
- Whether there’s mould to deal with
- Any working-time requirements on site
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- If someone has resealed it before
- If it’s domestic, commercial or a hotel
- How many joints, rooms or windows are involved
- The address or postcode of the job
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, call 0345 464 0079 or email us.
Also near Saint Hill Green
More services for Saint Hill Green
Frames and glazing around Saint Hill Green
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Saint Hill Manor (about 0.1 miles north-west) are a reminder that the area around Saint Hill Green has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
In the older streets around St. Barnabas Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you look after a building such as The Meads Primary School, its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to East Grinstead station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Saint Hill Green is about 2 miles south of East Grinstead, in West Sussex. Homes, rented property, offices and hotels in Saint Hill Green can book us for sand mastic, old or new, large or small. Every job comes with our one-year guarantee. Saint Hill Green is one of 371 towns and villages in West Sussex where we work for sand mastic. Crawley is on our list too, around 7 miles away.
Work in RH19 works the same way as everywhere else we cover. Sand mastic is available to properties on Saint Hill Road and West Hoathly Road. Other places close to Saint Hill Green include East Grinstead (2 miles north), Ashurst Wood (2 miles east), Crawley Down (3 miles north-west), Turners Hill (3 miles west) and Felbridge (3 miles north-west). Larger places within reach include Crawley (7 miles west), Horsham (13 miles west), Haywards Heath (8 miles south-west), Burgess Hill (11 miles south-west), Broadfield (8 miles west) and Bewbush (8 miles west).
Landmarks near Saint Hill Green
We work in homes and buildings around Sackville School and the streets around them. Saint Hill Green’s nearest station is East Grinstead station, about 1.5 miles north. Well-known places in the area include Queen Victoria Hospital (2.4 miles north-east) and East Grinstead Museum (1.6 miles north-east). The countryside around Saint Hill Green includes Hedgecourt Lake.
Why act early in Saint Hill Green
Before painting the windows, it pays to renew the mastic. Painting over failed mastic doesn’t seal it and traditional guidance is to leave the new mastic unpainted. Around Saint Hill Green, older homes often have timber in their 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 is why we ask a few questions first and give you a clear quote before any work starts.
Why us?
- Tidy, careful work
- 20+ years of sealant experience
- Homes, businesses and hotels
- Sanitary silicone with an anti-fungal additive in wet areas
Take a look at what affects the cost and what customers say.
Questions from Saint Hill Green
Will you come out to Saint Hill Green?
Yes, Saint Hill Green is covered. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Can you do sand mastic in Saint Hill Green?
Yes, Saint Hill Green is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or email us with a few details of the job, and we will send you a clear quote.
What sealant do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we will tell you what we are using.
How long will you be here?
As a guide, most jobs take anything from a few hours to a full day, depending on how many windows. Bigger jobs take longer, and we’ll tell you how long to expect.
How long does sand mastic take to harden?
It forms a skin fairly soon and it hardens fully over a longer time. Timing depends on the weather and the joint.
Should I check with the council before work on a listed or conservation-area home?
Yes, it’s worth checking. Your local planning authority can say if consent is needed for listed or conservation-area properties.
What’s sand mastic made of?
It’s a mix of sand and a linseed-oil-based binder. It’s built up in the joint by hand and finished to sit neatly against the masonry.
Do I have to be there?
If the work is inside, we need someone to let us in. Once we have agreed the job, you do not need to watch us work.