Kent · England
Devil's Den Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Devil's Den, with a 12-month guarantee on every job. Call for a quick quote.
- Crumbling sand mastic round a window
- Tired mastic found when preparing windows for paint
- Gaps round a timber door in stone or brick
Sand mastic for homes and businesses in Devil's Den
Silicone on a period window often looks wrong and does not suit the building. Sand mastic is the traditional choice and we can swap the silicone for it. If you have tired mastic found when preparing windows for paint and gaps between timber frames and stone or brick, we can put it right, on period & listed homes, tenement windows and brick reveals alike.
Somewhere as small as Devil's Den, 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.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- Devil's Den (ME17)
- Region
- Kent
- Guarantee
- One year on every job
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How the visit works
Good joint work is mostly preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours for a single window, longer for several. Somewhere like Devil's Den needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- Where the joints are inside, avoid wetting them before we arrive
- Move anything stored near the joints
How to get a quote
We do not publish a price list, as no two jobs are quite the same. Instead, we give you a clear quote for your job. To arrange one, call 0345 464 0079 or drop us an email.
Related advice
Aftercare tips
Good habits help new joints last longer. Our tips:
- Get any rot dealt with first
- Avoid heavy scraping on the mastic joint
- Keep sills and gutters clear so water drains away
- Sort the mastic before the decorators arrive
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look before trying a quick fix.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
DIY sealant or a professional job?
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.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
Sand mastic in Devil's Den: local notes
With historic houses such as Stoneacre (about 4 miles north) nearby, there’s older building stock in the area around Devil's Den as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Stoneacre, about 4 miles north, is one of the historic houses in the wider area around Devil's Den, and older homes nearby need a sealant that suits their walls.
Devil's Den is about 5 miles south of Maidstone, in Kent. Our applicators cover sand mastic for homes and businesses in Devil's Den and nearby. Our Kent coverage runs to 922 places, Devil's Den among them. You can also see our page for Crawley, roughly 34 miles from Devil's Den.
Jobs for sand mastic in ME17 is quoted and booked the same way as anywhere else. We also cover the places around Devil's Den: Farthing Green (1 mile south-east), Rabbit's Cross (1 mile west), Cross-at-Hand (1 mile west), Hawkenbury (1 mile south) and Staplehurst (2 miles south-west). Within a short drive, we also cover Maidstone (5 miles north), Ashford (13 miles east), Sittingbourne (12 miles north-east), Royal Tunbridge Wells (14 miles west), Tonbridge (13 miles west) and Kings Hill (9 miles north-west).
What’s near Devil's Den
The nearest railway station is Staplehurst station, roughly 1.8 miles south-west of the centre. Other landmarks nearby include Sutton Valence Castle (1.6 miles north-east) and South East Romany Museum (3 miles south-west).
Signs you need sand mastic in Devil's Den
Previous repairs in cement or silicone often trap water or crack away. They do not move with the timber and we normally remove them.
It’s worth asking for a quote if you see:
- Silicone on a period window that looks wrong
- Cement or filler used on old window joints that has cracked
- Mastic that needs renewing before redecorating
- Gaps round a timber door in stone or brick
For landlords with property near Staplehurst station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
What to look for in a quote
- How long the guarantee is
- Which sealant they’ll use, and why
- How long to leave it before use
- What insurance they hold
Why deal with it now?
New mastic over crumbling mastic will not hold. We remove the loose material first so the new work lasts. Where a wall is exposed, as many are in small places like Devil's Den, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
The cost depends on how much there is to do, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
Why us?
- More than 20 years in sealant work
- Full insurance on every job
- Quality sealants from Arbo and Everbuild
- Rated 4.9 stars on Google
Take a look at how sealant jobs are priced and our reviews.
What sealant work cannot fix
New sealant cannot fix everything, and we’d rather say so up front. Sealant will not put right:
- Cracked or broken glass
- Decisions on consent for listed homes
- Sash cords, weights and draught-proofing of the sashes
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly before booking.
Joints and surfaces we work on
- Stone surrounds
- Sash and case windows
- Tenement windows
- Timber door frames
- Brick reveals
- Period & listed homes
Places near Devil's Den
Other services in Devil's Den
Questions from Devil's Den
Do you cover smaller places like Devil's Den?
Yes, Devil's Den is covered. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
I let a flat near Staplehurst station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just call 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear quote.
What guarantee comes with the work?
There’s a 12-month guarantee on every job.
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.
How long will you be here?
That depends on how much there is to do, but as a guide it takes a few hours for a single window, longer for several. We will tell you when we quote.
Are you an approved applicator?
Yes. We’re an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
How do I get a quote for sand mastic in Devil's Den?
It depends on the job, so we quote each one individually. For a quick quote, call 0345 464 0079 or send us an email with a short description of the job.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all.