Kent · England
Sand mastic for sash & case windows in Sellindge, Kent
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Sellindge. Fully insured, ARBOMaster approved and guaranteed for a year.
- Wind and rain getting in round a sash window
- Cement or filler used on old window joints that has cracked
- Weathered mastic on the most exposed windows
Sand mastic in Sellindge, done properly
A silicone bead around a sash window can look out of place and doesn’t suit the building. Sand mastic is the traditional choice, and we can replace one with the other. If you have silicone on a period window that looks wrong and window mastic to renew ahead of painting, we can put it right, whatever the surface.
Mastic can only go onto a dry, clean joint, so window work in Sellindge is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Location
- Sellindge (TN25)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What we do, step by step
We work through the job in order: protect, prepare, seal, tidy. Typically it takes a few hours for a single window, longer for several and we leave things clean and tidy. In a small place like Sellindge, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Before we arrive
- Tell us about any previous sealing or DIY attempts
- Mention any tricky access
- Clear the area around the work
Getting a quote
If you are in Sellindge and need sand mastic, ring 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Advice
Why deal with it now?
If you are redecorating, renew the mastic first. Paint over cracked mastic won’t stop the gaps and traditional guidance is to leave the new mastic unpainted. Where a wall is exposed, as many are in small places like Sellindge, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why book with us
- One-year guarantee on every job
- 180+ five-star Google reviews
- Trusted Arbo and Everbuild sealants
- 20+ years of sealant experience
Sellindge homes and the weather
Historic houses like Westenhanger Castle (about 1.4 miles south-east) are a reminder that the area around Sellindge has older buildings as well as new. 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near Westenhanger station, cracked sand mastic around sash windows lets in the draughts tenants complain about. If you live in an older home near Church of St Mary, frames set in older brick or stone need a sealant that suits the wall as well as the frame. For site and facilities teams at buildings such as Sellindge Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Sellindge is about 4 miles north-west of Hythe, in Kent. Across the TN25 area, we can carry out sand mastic at your property. Sellindge is one of 922 towns and villages in Kent where we work. Our Chelmsford page covers work nearby.
Every address in TN25 is covered for sand mastic, from the main roads to the quietest streets. We cover properties on Downs Way, Woodlees Close and Swan Green. If you’re just outside Sellindge, we cover Moorstock (1 mile north), Stanford (2 miles east), Postling (3 miles east), Stowting (3 miles north-east) and Skeete (3 miles north-east). Larger places within reach include Ashford (6 miles north-west), Canterbury (13 miles north), Dover (13 miles east), Folkestone (7 miles east), Faversham (15 miles north) and Hythe (4 miles south-east).
Near you in Sellindge
Sellindge’s nearest station is Westenhanger station, about 1.6 miles south-east. Well-known places in the area include William Harvey Hospital (4.7 miles north-west) and Lympne Castle (2.4 miles south). Green spaces nearby include Tolsford Hill and Hatch Park.
Sellindge questions
I let a flat near Westenhanger station. Can you help?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Will you come out to Sellindge?
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.
Where are you based?
Our base is in Crawley, and we cover South East England, London and all of Scotland.
Will there be a smell?
Sometimes, a little. Any smell clears as the sealant cures.
What does sand mastic cost?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote and we will talk you through it.
What guarantee comes with the work?
Every job comes with our 12-month guarantee.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We explain the product when we quote.
How long does sand mastic take?
A typical job takes anything from a few hours to a full day, depending on how many windows, including the preparation. Your quote will say how long we expect yours to take.
DIY versus a professional finish
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
What the job involves on each surface
Stone surrounds
We take care not to mark the stone when the old mastic comes out.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair so it’s worth checking responsibilities.
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Go gently near the mastic when preparing windows
- Make sure water runs off the sill
- Avoid patching sand mastic with silicone
- Look over the window mastic once a year
Leave the new mastic unpainted, which is the traditional advice. Ask us before any decorating around it.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.
Also in Sellindge
When something else is needed
We will always be straight with you, so here’s what new sealant will not do:
- Broken panes
- Planning or listed building consent (your local planning authority decides)
- Timber that has rotted
If you’re not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer before booking.
What we seal
- Tenement windows
- Timber door frames
- Sash and case windows
- Period & listed homes
- Stone surrounds
- Brick reveals
What affects the cost of sand mastic
Call for a quick quote. The main things that affect it are:
- The old material and how stubborn it is
- The number and length of the joints
- Working hours on commercial sites
- Whether there’s mould to deal with
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first and send you a clear quote before we start.
What we need to know
To make quoting easier, let us know:
- Roughly how big the job is
- How we’d reach the joints
- Pictures of the joints, sent by email
- If someone has resealed it before
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or send us an email.