East Sussex · England
Gun Hill Sand Mastic
We cover Gun Hill for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly.
- Gaps between timber frames and stone or brick
- Window mastic to renew ahead of painting
- Mastic round period door frames that has failed
Surface by surface
Brick reveals
Sand mastic is also used where timber frames meet brick. It gives a traditional finish.
Sash and case windows
Most of our sand mastic work is on sash windows. Each joint round the box is raked out and renewed.
Sand mastic in Gun Hill
A silicone bead around a sash window can look out of place and doesn’t suit the building. Sand mastic gives a finish that matches the age of the house and we can swap the silicone for it. Common call-outs are for modern sealant on a period surround and gaps where the frame meets the masonry, on brick reveals, period & listed homes and sash and case windows.
Mastic can only go onto a dry, clean joint, so window work in Gun Hill is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
We stand behind the work with a 12-month guarantee, so you are covered after we have gone.
- Where
- Gun Hill (TN21)
- Wider area
- East Sussex
- Cover
- 12 months on all our work
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Work for landlords, hotels and businesses
We also work for property managers and facilities teams. We can quote a run of properties together.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Should I try it myself first?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
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.
Do you need sand mastic in Gun Hill?
Shallow joints are a common cause. A thin layer doesn’t hold well, which is why we pack deep voids first and get the depth right.
Look out for these signs:
- Silicone on a period window that looks wrong
- Mastic round period door frames that has failed
- Old sand mastic that has cracked, crumbled or fallen out
- Draughts and rain around sash boxes
Around Gun Hill, as everywhere, sand mastic is only as good as the preparation behind it.
Comparing quotes
- Whether VAT is included
- Whether all the old sealant comes out first
- What happens if the job turns out different
- Whether they’re fully insured
Nearby places to Gun Hill
More services for Gun Hill
FAQs for Gun Hill
Can you do sand mastic in Gun Hill?
Yes. We work across London and the South East, and Gun Hill is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job.
Will you come out to Gun Hill?
Yes, we do. 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.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
How do I get a quote for sand mastic in Gun Hill?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Can you quote for more than one area?
Yes. Several rooms, windows or areas can go on one quote.
How long does the job take?
As a guide, most jobs take anything from a few hours to a full day, depending on how many windows. Larger jobs naturally take longer, and we’ll say how long yours will take.
What is sand mastic?
A traditional pointing material made from sand and a linseed-oil-based binder for the joint between timber frames and masonry.
Where do you work from?
Mr Mastic is based in Crawley. Our applicators cover Gun Hill.
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Ask us before painting near the mastic
- Plan mastic work ahead of painting
- Take care around the mastic when scraping paint
- Keep modern sealant off the mastic
Avoid sealing over the mastic with silicone. If anything cracks, get it looked at rather than patching it.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall, so renewing it early is worth it.
The process
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The job generally takes a few hours per window, depending on the condition of the joints, including the tidy-up. In a small place like Gun Hill, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Plan for the work area to be out of bounds to pets and children
- Mention any leaks or damp you’ve noticed
Getting a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To arrange one, ring 0345 464 0079 or send us an email.
Advice
Sand mastic in Gun Hill: local notes
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Horselunges Manor (about 1.9 miles south-east) are a reminder that the area around Gun Hill 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.
Historic houses such as Horselunges Manor, about 1.9 miles south-east, show how far back building around Gun Hill goes, and older homes nearby need a sealant that suits their walls.
Gun Hill is about 3 miles north-west of Hailsham, in East Sussex. Gun Hill gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Our East Sussex coverage runs to 289 places, Gun Hill among them. There’s also a page for Brighton, roughly 16 miles from Gun Hill.
Our applicators cover all of the TN21 postcode area for sand mastic. Other places close to Gun Hill include Hale Green (1 mile west), Muddles Green (1 mile south-west), Burlow (1 mile north-east), Horam (2 miles north-east) and Lions Green (2 miles north). We also work in nearby towns such as Eastbourne (9 miles south), Hastings (15 miles east), Bexhill-on-Sea (11 miles east), Seaford (10 miles south-west), Lewes (10 miles west) and Hailsham (3 miles south-east).
Near you in Gun Hill
Other landmarks nearby include Hellingly Hospital Railway (2.1 miles south-east) and Sussex Farm Museum (1.9 miles north-east). Not far away are Selwyns Wood.
Why deal with it now?
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic will not stop the gaps, and the new mastic is traditionally left unpainted. Older cottages and farmhouses around Gun Hill can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we’ll go through it with you.
What you get with us
- Domestic, commercial and hotel work
- Arbo and Everbuild products
- An ARBOMaster approved applicator
- 20+ years of sealant experience
Read how sealant jobs are priced and our reviews.