Kent · England
Sand Mastic in The Platt
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for The Platt, backed by a 12-month guarantee. Call for a quick quote.
- Draughts and rain around sash boxes
- Old sand mastic that has cracked, crumbled or fallen out
- Window mastic to renew ahead of painting
How we handle sand mastic in The Platt
Old sand mastic cracks, crumbles and falls out over time, leaving gaps round the window. Renewing it closes the gap and tidies the surround. If you are dealing with mastic round period door frames that has failed and tired mastic found when preparing windows for paint, we can help.
Outdoor sealant needs dry, clean surfaces, so work on frames around The Platt is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
You get a one-year guarantee, the same in The Platt as everywhere else we work.
- Where
- The Platt (TN3)
- Region
- Kent
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What affects the cost of sand mastic
Every job gets its own quote. This is what makes a difference:
- Working hours on commercial sites
- Whether old sealant or filler has to be cut out
- Whether there’s mould to deal with
- How many rooms, windows or areas are involved
Doing several joints on one visit usually makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
Helping us quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Pictures of the joints, sent by email
- What’s wrong with the joints now
- How we’d reach the joints
- If it’s domestic, commercial or a hotel
We don’t publish a price list, because every job is different. Instead, we give you a clear price for your job. To get started, call 0345 464 0079 or drop us an email.
Your questions about sand mastic in The Platt
Do you work for landlords with property near Frant station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
Is The Platt in your area for sand mastic?
Yes. We work across London and the South East, and The Platt is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Do I have to be there?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Can I do it myself?
You can, for simple jobs. 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.
Where are you based?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Do the sealants smell?
Possibly a little. It fades as the sealant cures.
Are you fully insured?
Yes. We’re fully insured.
Should I check with the council before work on a listed or conservation-area home?
Check with your local planning authority. They decide whether consent is needed for work to your windows.
Leave it or put it right?
If you’re redecorating, renew the mastic first. Paint over cracked mastic won’t stop the gaps, and the new mastic is traditionally left unpainted. Around The Platt, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we’ll explain what it covers.
Why choose Mr Mastic in The Platt
- Quality sealants from Arbo and Everbuild
- A 12-month guarantee on all work
- Experience in homes, commercial sites and hotels
- Rated 4.9 stars on Google
See our cost guide or what customers say.
How it works
A visit follows a simple pattern: we look at the joints together, protect the area around them, carry out the job and tidy away. It usually takes a few hours for a single window, longer for several. Somewhere like The Platt needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We check each window surround and the condition of the joint.
- 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.
Before we arrive
- Keep pets and children clear of the area while we work
- Mention any leaks or damp you’ve noticed
- Tell us about any previous sealing or DIY attempts
Getting a quote
Every job is quoted individually, so the first step is telling us about yours. Just call 0345 464 0079 or send us an email with the details, and photos are welcome.
Advice
Different surfaces, different methods
Timber door frames
Round a period front door, sand mastic gives the right look.
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
Do you need sand mastic in The Platt?
Some old mastic was never deep enough. A thin layer does not hold well so we make sure the new mastic is the right thickness.
The most common problems we see are:
- Cracked mastic round a front door frame
- Crumbling sand mastic round a window
- Open joints round the window box
- Draughts and rain around sash boxes
Homes close to The Parish Church of St Alban include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Before booking anyone
- How the surfaces are prepared before sealing
- Whether they seal over old material or remove it
- Whether they’re fully insured
- Which sealant they’ll use, and why
Frames and glazing around The Platt
Historic houses like Wadhurst Castle (about 3 miles south-east) are a reminder that the area around The Platt has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Rented homes near Frant station change hands often, and any sash windows need sound mastic to keep draughts and rain out. Managing a site like Frant Church of England Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
The Platt is about 4 miles south of Royal Tunbridge Wells, in Kent. For sand mastic in and around The Platt, it’s easy to get a quote: please ring 0345 464 0079 or send us an email. We cover Kent from our Crawley base. We cover 922 towns and villages across Kent. Crawley is on our list too, around 20 miles away.
Work in TN3 is quoted and booked the same way as anywhere else. Other places close to The Platt include Frant (1 mile north), Mark Cross (2 miles south), Eridge Green (2 miles north-west), Town Row (3 miles south-west) and Tidebrook (3 miles south). Within a short drive, we also cover Sevenoaks (14 miles north), Royal Tunbridge Wells (4 miles north), Tonbridge (8 miles north), Kings Hill (14 miles north-east), Paddock Wood (8 miles north-east) and Southborough (5 miles north).
Landmarks near The Platt
In The Platt, that means homes and buildings near The George Public House and Eridge Park. The nearest railway station is Frant station, about 1.7 miles north-east of the centre. Well-known places in the area include Tunbridge Wells Homeopathic Hospital (3.4 miles north) and The Corn Exchange (2.9 miles north). Not far away are Broadwater Warren RSPB Reserve.
How to look after the new joints
So the new joints stay in good condition:
- Ask a joiner to look at soft timber first
- Keep sills and gutters clear so water drains away
- Ask us before painting near the mastic
- Avoid heavy scraping on the mastic joint
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
Towns and villages near The Platt
Also in The Platt
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.