Kent · England
Sand Mastic in Cudham
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Cudham, backed by a 12-month guarantee. Ask us for a quote.
- Silicone on a period window that looks wrong
- Gaps round a timber door in stone or brick
- Window mastic to renew ahead of painting
Sand mastic in Cudham
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. Common call-outs are for tired mastic found when preparing windows for paint and crumbling sand mastic round a window, on brick reveals, timber door frames and stone surrounds.
Around Cudham, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
Each job carries a 12-month guarantee.
- Where
- Cudham (TN14)
- Wider area
- Kent
- Cover
- A year, on every job
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What sand mastic looks like in Cudham
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Down House (about 1.4 miles north-west) nearby, there’s older building stock in the area around Cudham as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
Managing a site like Cudham Church of England Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. For an older house near a landmark such as Church of St Peter and St Paul, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Cudham is about 5 miles south of Orpington, in Kent. From the centre of Cudham to the outskirts, sand mastic is available for homes and businesses alike. Our area takes in 922 places across Kent, large and small. We also work in London, about 15 miles from Cudham.
Every address in TN14 is covered for sand mastic, from the main roads to the quietest streets. Local streets include Cudham Lane South, Cacket's Lane and Newbarn Lane, all of which we cover. If you are just outside Cudham, we cover Single Street (1 mile west), Berry's Green (1 mile south-west), Horns Green (1 mile south-east), Burlings (1 mile south-east) and Luxted (1 mile north-west). Within a short drive, we also cover Dartford (11 miles north-east), Sevenoaks (5 miles south-east), Royal Tunbridge Wells (15 miles south-east), Gravesend (15 miles north-east), Tonbridge (12 miles south-east) and Northfleet (14 miles north-east).
Landmarks near Cudham
We work in homes and buildings around Charles Darwin School and The Blacksmith's Arms. The nearest railway station is Chelsfield station, roughly 3.1 miles north-east. Other landmarks nearby include Orpington Hospital (3.3 miles north) and Crofton Roman Villa (3.9 miles north). Green spaces nearby include Downe Bank and Betsom's Hill.
Signs you need sand mastic in Cudham
Some old mastic was never deep enough. Mastic that’s too thin cracks and drops out so we make sure the new mastic is the right thickness.
Signs it’s time to call us include:
- Gaps round a timber door in stone or brick
- A silicone bead on a sash window that spoils the look
- Crumbling sand mastic round a window
- Weathered mastic on the most exposed windows
If you let a flat or house near Chelsfield station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Comparing quotes
- Which sealant they’ll use, and why
- Whether they seal over old material or remove it
- How the joint is cleaned and prepared
- Are they insured?
What affects the cost of sand mastic
Jobs vary more than people expect. What affects the quote:
- When we can work, for business premises
- Access and height
- The number of rooms or windows
- Mould in or behind the old joints
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or email us.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- How many joints, rooms or windows are involved
- What the problem is, such as mould, gaps, leaks or cracking
- Where the property is
- The type of property
Want a quote for sand mastic? Please call 0345 464 0079 or drop us an email with a few details. We will explain what we’d do and give you a clear quote before any work starts.
Leave it or put it right?
Gaps round a sash window let in rain and draughts. Water can get to the frame and the masonry so renewing it early protects the window. Where a wall is exposed, as many are in small places like Cudham, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What you get with us
- Sanitary silicone with an anti-fungal additive in wet areas
- Every job guaranteed for a year
- Approved under the ARBOMaster scheme
- Over 20 years’ experience
Read our cost guide or customer reviews.
How it works
When we arrive, we start by going over the job with you, so you know exactly what we’re doing. We protect the surfaces around the joints before we start. Most jobs take a few hours for a single window, longer for several. In a small place like Cudham, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- 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.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Clear the area around the work
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
Every job is quoted individually, so start by telling us what you need. Just call 0345 464 0079 or drop us an email with the details, and photos are welcome.
Read more
Honest limits
In fairness, there are a few things sealant will not fix:
- Decayed frames that need repair
- Sashes that rattle, stick or won’t open
- Cracked or broken glass
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before booking.
Surfaces we seal
- Stone surrounds
- Brick reveals
- Timber door frames
- Period & listed homes
- Tenement windows
- Sash and case windows
Towns and villages near Cudham
Other services in Cudham
Common questions in Cudham
Do you cover Cudham for sand mastic?
Yes. We work across London and the South East, and Cudham is part of that. You can phone 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll give you a clear price.
Do you cover smaller places like Cudham?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we will quote it together.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Is sand mastic better than silicone for my windows?
It depends on the window. Period windows in stone or brick generally suit sand mastic, while modern frames normally get a flexible sealant.
Can you replace silicone on a period window with sand mastic?
Yes, we do this often. The old silicone has to come out completely so the mastic can sit properly.
How long does sand mastic take to go off?
It skins over fairly quickly but takes longer to harden fully. We will tell you what to expect for your job.
Is consent needed for window work on a listed home?
Your local planning authority is the one to ask. They decide whether consent is needed.
Aftercare tips
Aftercare is simple, and it makes a real difference:
- Keep sills and gutters clear so water drains away
- Keep modern sealant off the mastic
- Find out about consent before window work on a listed home
- Sort the mastic before the decorators arrive
Leave the new mastic unpainted, which is the traditional advice. Ask us before any decorating around it.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber and timber that stays wet can rot.
How the job changes by surface
Sash and case windows
On a sash window, the mastic joint shows on the outside, so a neat, even finish matters.
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We work on single windows or whole elevations.