Kent · England
Sand mastic for sash & case windows in Heart's Delight, Kent
Sand mastic in Heart's Delight from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Patchy fillers round a sash window
- A silicone bead on a sash window that spoils the look
- Draughts and rain around sash boxes
Sand mastic for homes and businesses in Heart's Delight
Burnt sand mastic is a traditional material that sits naturally against stone and brick. It suits period and listed homes, where modern sealant can look out of place. Common call-outs are for gaps round a timber door in stone or brick and open joints round the window box, across sash and case windows, timber door frames and tenement windows.
Mastic can only go onto a dry, clean joint, so window work in Heart's Delight is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Heart's Delight (ME10, ME9)
- Wider area
- Kent
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Why it’s worth doing now in Heart's Delight
If you’re redecorating, renew the mastic first. Painting over failed mastic does not seal it and traditional guidance is to leave the new mastic unpainted. Around Heart's Delight, 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 agree the price before starting.
What you get with us
- Old sealant always removed completely
- 20+ years of sealant experience
- Experience in homes, commercial sites and hotels
- Trusted Arbo and Everbuild sealants
Read our cost guide or what customers say.
Heart's Delight homes and the weather
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Schools such as Minterne Community Junior School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. For landlords with property near Sittingbourne station, any sash windows need sound mastic to keep draughts and rain out.
Heart's Delight is about 1 mile south-west of Sittingbourne, in Kent. From the centre of Heart's Delight to the outskirts, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Across Kent, we cover 922 places, and Heart's Delight is one of them. We also work in Chelmsford, around 30 miles away.
Every address in ME10 and ME9 is covered for sand mastic. Sand mastic is available to properties on The Street, Borden Lane and Coppins Lane and the roads around them. We also cover the places around Heart's Delight: Borden (1 mile north-west), Tunstall (1 mile south-east), Sittingbourne (1 mile north-east), Highsted (2 miles south-east) and Rodmersham Green (2 miles south-east). Within a short drive, we also cover Maidstone (9 miles south-west), Ashford (15 miles south-east), Whitstable (14 miles east), Faversham (8 miles east), Minster (7 miles north-east) and Kings Hill (14 miles west).
Around Heart's Delight
Around Heart's Delight, our work takes us to homes and buildings near Westlands School and Cromers Wood, among other places. For rail, the closest station is Sittingbourne station, about 1.4 miles north-east. A little further out are Bayford Court (1.7 miles north-east) and Sittingbourne Heritage Museum (1.5 miles north-east).
Places near Heart's Delight
Also in Heart's Delight
Common problems we fix in Heart's Delight
Decorating can disturb tired mastic. It’s often found when windows are being prepared for paint.
Any of these means the joints need attention:
- Window mastic to renew ahead of painting
- Old sand mastic that has cracked, crumbled or fallen out
- Mastic round period door frames that has failed
- Draughts and rain around sash boxes
Homes close to Church of St Peter and St Paul include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Comparing quotes
- How long to leave it before use
- Whether the sealant suits the joint
- The length of the guarantee
- Whether all the old sealant comes out first
What we can’t put right
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Masonry that needs repairing
- Sashes that rattle, stick or won’t open
- Decisions on consent for listed homes
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Tenement windows
- Timber door frames
- Stone surrounds
- Brick reveals
- Period & listed homes
- Sash and case windows
Common questions in Heart's Delight
Can you help a landlord with a rental near Sittingbourne station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or email us with the details for a clear quote.
Is Heart's Delight in your area for sand mastic?
Yes, Heart's Delight is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll give you a clear price.
Where do you work from?
We’re based in Crawley, and we work across South East England, London and Scotland.
Should I try DIY first?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
How long does sand mastic take to go off?
It skins over fairly quickly but takes longer to harden fully. We’ll explain what to expect before we leave.
Is it possible to take out silicone and use sand mastic instead?
In most cases. We remove the silicone and clean the joint, then point it with sand mastic.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Is consent needed for window work on a listed home?
Check with your local planning authority. They decide whether consent is needed for work to your windows.
How it works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes anything from a few hours to a full day, depending on how many windows. Somewhere like Heart's Delight needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any sign-in or site rules at work premises
- Mention any parking rules near the property
How to get a quote
Getting a quote is simple: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we will come back to you with a quote.
Read more
For landlords and businesses
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
What affects the quote in Heart's Delight
Your quote is based on your job. We take into account:
- The product the joint needs
- Mould in or behind the old joints
- Whether old sealant or filler has to be cut out
- The size of the job
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
What we need to know
Before you ask for a quote, have a think about:
- How many joints, rooms or windows are involved
- If someone has resealed it before
- Any access issues, like height or stairs
- The problem you’ve noticed
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email pictures if that’s easy.
How the job changes by surface
Timber door frames
Doors face weather and wear, so their mastic can fail sooner. It’s renewed by hand.
Period and listed homes
Many older homes were built with sand mastic round the windows. On listed buildings, check with your planning authority first.