West Sussex · England
Sand mastic for sash & case windows in Dial Post, West Sussex
Our applicators work in Dial Post on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and a one-year guarantee.
- A silicone bead on a sash window that spoils the look
- Cement or filler used on old window joints that has cracked
- Mastic worn away on windows facing the weather
Sand mastic in Dial Post
Silicone on a period window often looks wrong and isn’t always the right material. Sand mastic gives a finish that matches the age of the house, and we can replace one with the other. We work on brick reveals, stone surrounds and period & listed homes, and the jobs we see most are crumbling sand mastic round a window and open joints round the window box.
Somewhere as small as Dial Post, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
You get a 12-month guarantee, the same in Dial Post as everywhere else we work.
- Location
- Dial Post (RH13)
- Region
- West Sussex
- Guarantee
- 12 months on all our work
- Price
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Do you need sand mastic in Dial Post?
Scraping and sanding before painting can loosen old mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
These are the problems we are asked about most:
- Mastic that needs renewing before redecorating
- Old cement repairs round a window that have failed
- Cracked mastic round a front door frame
- Draughts and rain around sash boxes
For jobs in and around Dial Post, choosing the right material for each joint is as important as a tidy finish.
Questions to ask before you book
- Whether all the old sealant comes out first
- What happens if the job turns out different
- Whether the sealant suits the joint
- How long the guarantee is
Towns and villages near Dial Post
Other services in Dial Post
Different surfaces, different methods
Brick reveals
Sand mastic is also used where timber frames meet brick. It suits older brickwork.
Sash and case windows
The mastic round a sash window is on show, so a neat, even finish matters.
Windows and doors in Dial Post
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Around Dial Post, as everywhere, sand mastic is only as good as the preparation behind it.
Dial Post is about 7 miles south of Horsham, in West Sussex. Every kind of property in Dial Post can book us for sand mastic, old or new, large or small. Every job comes with our 12-month guarantee. 371 places in West Sussex are on our list, from the larger towns to small villages. We also work in Crawley, about 13 miles from Dial Post.
We cover every part of the RH13 postcode area for sand mastic and the streets around it. We cover properties on The Green, Swallows Lane and Bentons Lane and the roads around them. We also cover the places around Dial Post: Whitehall (2 miles north-west), Shipley (2 miles north), West Grinstead (2 miles north-east), Broomer's Corner (2 miles north-west) and Partridge Green (2 miles east). Within a short drive, we also cover Crawley (13 miles north-east), Horsham (7 miles north), Worthing (10 miles south), Haywards Heath (12 miles east), Burgess Hill (10 miles east) and Littlehampton (13 miles south-west).
Local landmarks in Dial Post
For a walk, there’s Knepp Wildland and Chanctonbury Hill.
Why act early in Dial Post
Gaps round a sash window let in rain and draughts. Water can get to the frame and the masonry, so dealing with it now protects both. Where a wall is exposed, as many are in small places like Dial Post, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part, and we will explain the quote if you ask.
Why book with us
- Rated 4.9 stars on Google
- Anti-fungal sanitary silicone in wet areas
- We’re fully insured
- Neat joints and a tidy finish
Take a look at our cost guide and what customers say.
Honest limits
We’d rather tell you now than do work that will not last, so here’s what sealant cannot put right:
- Planning or listed building consent (your local planning authority decides)
- Sash cords, weights and draught-proofing of the sashes
- Putty and glazing repairs
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly.
What we seal
- Period & listed homes
- Stone surrounds
- Brick reveals
- Tenement windows
- Sash and case windows
- Timber door frames
Questions from Dial Post
Is Dial Post in your area for sand mastic?
Yes, Dial Post is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job.
Is Dial Post within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can old silicone round a sash window be swapped for sand mastic?
Yes, it’s a common request. All the old silicone is removed first so the mastic beds in well.
Do you take out the old sealant first?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Do you work for letting agents?
Yes. We work in homes, commercial premises and hotels.
Are you fully insured?
Yes. We’re fully insured for domestic and commercial work.
How much does sand mastic cost in Dial Post?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Is there any odour?
That depends on the sealant. Some smell for a while, some hardly at all.
The process
All our tools and materials come with us in the van, so there’s nothing for you to buy. Once we’ve agreed what’s being done, we protect the area and start. It normally takes a few hours per window, depending on the condition of the joints. Somewhere as small as Dial Post, access is often the only tricky part. 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.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- Let us know about stairs, lifts or work at height
- Mention any sign-in or site rules at work premises
Ask for a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, phone 0345 464 0079 or drop us an email.
Related advice
DIY versus a professional finish
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
How we quote for sand mastic
Jobs vary more than people expect. What affects the quote:
- How much old sealant there is and how hard it is to remove
- Any working-time requirements on site
- Which sealant suits the joint
- How many areas need sealing
What it costs depends on the amount of work, how much old material has to come out and access to the work. We give a clear quote before any work starts.
Helping us quote
To make quoting easier, let us know:
- Photos by email, if that is easy
- Any previous sealing or DIY work
- Where the property is
- If it’s domestic, commercial or a hotel
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.