Kent · England
Hearnden Green Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Hearnden Green, with a 12-month guarantee on every job. Call for a quick quote.
- A silicone bead on a sash window that spoils the look
- Cement or filler used on old window joints that has cracked
- Gaps round a timber door in stone or brick
Sand mastic in Hearnden Green, done properly
Sand mastic suits most period window surrounds. Newer frames normally get a flexible sealant instead, and we will talk through which suits your home. If you have tired mastic found when preparing windows for paint and weathered mastic on the most exposed windows, we can help, on sash and case windows, brick reveals and timber door frames alike.
Outdoor sealant needs dry, clean surfaces, so work on frames around Hearnden Green is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Your job is guaranteed for a year, as with all our work.
- Where
- Hearnden Green (TN27)
- Region
- Kent
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What the job involves on each surface
Period and listed homes
Sand mastic is the like-for-like choice for many period homes. If your home is listed, ask your local planning authority about consent.
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. Sand mastic seals the joint round it.
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, and the work is guaranteed for a year.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Do you need sand mastic in Hearnden Green?
Age is the main cause. Even well-laid mastic needs renewing in time and how long it lasts depends on the weather it faces.
If you can see any of these, it’s time to have the joints looked at:
- Window mastic to renew ahead of painting
- Draughty sash windows at the surround
- Failed mastic on an exposed elevation
- Cement or filler used on old window joints that has cracked
If you let a flat or house near Headcorn station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Questions to ask before booking
- Whether you can choose the colour
- What guarantee comes with the work
- Are they insured?
- What product goes in the joint
The process
There isn’t much for you to do on the day. Show us the job and we will take it from there. The job generally takes anything from a few hours to a full day, depending on how many windows from start to finish. In a small place like Hearnden Green, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic isn’t too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Preparing for the visit
- Tell us about any water getting in
- Mention any parking rules near the property
- Mention any tricky access
Getting a quote
Want a quote for sand mastic? Please phone 0345 464 0079 or drop us an email and tell us about the job. We will explain what we’d do and give you a clear price before we start.
Advice
Why deal with it now?
A silicone bead can be quicker, but on period stone or brick it often looks out of place. Sand mastic is the traditional material and finishes neatly against the masonry. Where a wall is exposed, as many are in small places like Hearnden Green, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Combining jobs into one visit normally makes better use of the time than several visits, so tell us about everything that needs sealing. We will give you a clear quote for the lot.
What you get with us
- Full insurance on every job
- Any old sealant cut out fully, not covered over
- Experience in homes, commercial sites and hotels
- 12-month guarantee on every job
See our cost guide and our reviews.
Looking after it afterwards
Good habits help new joints last longer. A few tips:
- Avoid heavy scraping on the mastic joint
- Keep sills and gutters clear so water drains away
- Renew mastic before redecorating the windows
- Keep modern sealant off the mastic
Avoid painting over the new mastic, which is the traditional advice. Ask us before any decorating around it.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
What sealant work can’t fix
In fairness, there are a few things sealant won’t fix:
- Broken panes
- Sashes that need overhauling
- Decisions on consent for listed homes
If you are not sure, just ring 0345 464 0079 or email us and we will give you a straight answer.
What we seal
- Period & listed homes
- Stone surrounds
- Tenement windows
- Brick reveals
- Timber door frames
- Sash and case windows
Windows and doors in Hearnden Green
With historic houses such as Leeds Castle (about 4.1 miles north) nearby, there’s older building stock in the area around Hearnden Green as well as newer homes. Where a home is older, 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, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Historic houses such as Leeds Castle, about 4.1 miles north, show how far back building around Hearnden Green goes.
Hearnden Green is about 6 miles south-east of Maidstone, in Kent. For sand mastic in and around Hearnden Green, it’s easy to get a quote: please phone 0345 464 0079 or email us. We cover Kent from our Crawley base. Our area takes in 922 places across Kent, large and small. For nearby work, see our Crawley page.
Every address in TN27 is covered for sand mastic. Other places close to Hearnden Green include Headcorn (1 mile south-east), Southernden (2 miles east), Swift's Green (3 miles south-east), Smarden Bell (3 miles south-east) and Lashenden (4 miles south). We also work in nearby towns such as Maidstone (6 miles north-west), Ashford (12 miles east), Sittingbourne (12 miles north-east), Royal Tunbridge Wells (15 miles west), Tonbridge (15 miles west) and Faversham (15 miles north-east).
Around Hearnden Green
Hearnden Green’s nearest station is Headcorn station, roughly 1.8 miles south. Nearby you will also find Sutton Valence Castle (1.7 miles north-west) and Kent Firefighting Museum (3.6 miles south).
FAQs for Hearnden Green
Do you cover Hearnden Green for sand mastic?
Yes. We work across London and the South East, and Hearnden Green is part of that. You can phone 0345 464 0079 or email us and tell us what needs doing.
Do you work for landlords with property near Headcorn station?
Yes, we work for landlords and letting agents. You can call 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.
What does sand mastic cost?
Size, access and the old material all affect the cost. Call for a quick quote.
Can you seal over the old sealant?
No. We remove every bit of old sealant first.
Do you have insurance?
Yes. We’re fully insured, with over 20 years’ experience in sealant work.
Is sand mastic better than silicone for my windows?
We will help you decide. Period homes often look best with sand mastic and newer frames suit modern sealant.
Can old silicone round a sash window be swapped for sand mastic?
Often, yes. Once the silicone is out and the joint prepared, sand mastic is applied by hand.
Can I choose the sealant colour?
In most cases you can choose. We will tell you which colours the right product comes in and agree one before we start.