West Sussex · England
Gossops Green Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Gossops Green and across West Sussex. Fully insured, ARBOMaster approved and guaranteed for a year.
- Gaps where the frame meets the masonry
- Mastic dropping out of the joint
- Silicone on a period window that looks wrong
Sand mastic in Gossops Green, done properly
Old sand mastic cracks, crumbles and falls out over time, leaving gaps round the window. We rake it out and renew it and tidies the surround. We work on stone surrounds, tenement windows and period & listed homes, and the jobs we see most are cracked mastic round a front door frame and mastic that needs renewing before redecorating.
Many houses in smaller places like Gossops Green have conservatories, garden rooms or patio doors. Those joints need the same attention as the main windows, and any older timber or sash windows need a sealant that suits them.
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.
- Location
- Gossops Green (RH11, RH10)
- Region
- West Sussex
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What sand mastic looks like in Gossops Green
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. Crawley, which Gossops Green is part of, is one of England’s post-war new towns. With many homes from the post-war decades, replacement windows and doors are common. The mastic around replacement frames ages too, and gaps at sills and frame heads are where water gets in.
For an older house near a landmark such as St Peter's, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Rented homes near Ifield station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
Gossops Green is about 1 mile west of Crawley, in West Sussex. Gossops Green gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Our West Sussex coverage runs to 371 places, Gossops Green among them.
Here we cover the RH11 and RH10 postcode area for sand mastic. Local streets include Oak Road, Capel Lane and Goffs Lane, and we cover them all. Being close to the A23, Gossops Green is simple for us to get to for sand mastic. Nearby, we also carry out sand mastic in Ifield (1 mile north), Bewbush (1 mile south-west), Ifieldwood (2 miles north-west), Lambs Green (2 miles west) and Russ Hill (3 miles north-west). Larger places within reach include Horsham (6 miles south-west), Haywards Heath (9 miles south-east), Burgess Hill (11 miles south), East Grinstead (9 miles east), Billingshurst (12 miles south-west) and Roffey (5 miles south-west).
Near you in Gossops Green
In Gossops Green, that means homes and buildings near Target Hill Park, The Swan pub and St Wilfrid's Catholic School, among other places. Gossops Green has its own railway station: Ifield station. Other landmarks nearby include County Mall (0.9 miles east) and Crawley Hospital (less than half a mile north-east). Open spaces near Gossops Green include Tilgate Lake.
Also near Gossops Green
What else we do in Gossops Green
Questions from Gossops Green
Is Gossops Green within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Should the sealant in an older Gossops Green home be renewed?
Normally, yes, if it’s cracked, shrunk, mouldy or coming away. New sealant will not stick to old, so the old bead has to come out completely first.
What’s sand mastic made of?
A traditional pointing material made from sand and a linseed-oil-based binder for the joint between timber frames and masonry.
Is there any odour?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.
Where are you based?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
I rent my home. Can I book you?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Honest limits
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Whether work needs listed building consent
- Damaged stone surrounds
- Sashes that need overhauling
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly before you book.
Where we work in Gossops Green
- Brick reveals
- Sash and case windows
- Stone surrounds
- Tenement windows
- Period & listed homes
- Timber door frames
What affects the cost of sand mastic
There’s no set price list, because no two jobs are the same. What we look at:
- The number and length of the joints
- Any working-time requirements on site
- Any mould that needs treating
- Access and height
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
What to tell us for a quote
To make quoting easier, please include:
- The rough size of the job
- Whether it has been sealed before
- What’s wrong with the joints now
- Any access issues, like height or stairs
We quote each job on its own, so start by telling us what you need. Simply ring 0345 464 0079 or email us and describe the job, and photos are welcome.
Landlords, agents and businesses in Gossops Green
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
We work for landlords and agents as well as householders. Sealant work between tenants keeps a property looking cared for.
How the visit works
We bring everything the job needs with us. After a quick look at the joints together, the area is protected and the work begins. It normally takes a few hours per window, depending on the condition of the joints. A visit to Gossops Green is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
How to prepare
- Mention any sign-in or site rules at work premises
- Mention any leaks or damp you’ve noticed
- Mention if the joints have been sealed before
Getting a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved and give you a clear quote.
Read more
Why deal with it now?
Not every draught comes from the sashes themselves. Open mastic joints round the box can let air in and new mastic seals them. In an older home around Gossops Green, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
Why us?
- Anti-fungal silicone where joints get wet
- Tidy, careful work
- Rated 4.9 stars on Google
- More than 20 years in sealant work
Should I try it myself first?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
When to call us in Gossops Green
Most of it is simply age. Even well-laid mastic needs renewing in time, depending on exposure and upkeep.
The most common problems we see are:
- Failed mastic on an exposed elevation
- A silicone bead on a sash window that spoils the look
- Window mastic to renew ahead of painting
- Gaps where the frame meets the masonry
For site and facilities teams at buildings such as Ifield Community College, larger buildings have plenty of frames, and the mastic around each one ages.
What to look for in a quote
- Whether VAT is included
- What product goes in the joint
- What happens if the job turns out different
- Whether they seal over old material or remove it