Kent · England
Sand mastic for sash & case windows in Penshurst, Kent
Sand mastic across Penshurst and nearby, with old sealant always removed completely and a 12-month guarantee.
- Cement or filler used on old window joints that has cracked
- Gaps where the frame meets the masonry
- Gaps round a timber door in stone or brick
How we handle sand mastic in Penshurst
Sand mastic does not last for ever and gaps open up round the frame. We rake it out and renew it so the surround looks right again. Common call-outs are for crumbling sand mastic round a window and weathered mastic on the most exposed windows, on timber door frames, tenement windows and period & listed homes.
Homes in small places like Penshurst often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
There’s a 12-month guarantee on every job, large or small.
- Where
- Penshurst (TN11)
- Wider area
- Kent
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
So the new joints stay in good condition:
- Make sure water runs off the sill
- Go gently near the mastic when preparing windows
- Look over the window mastic once a year
- Don’t run silicone over sand mastic
Leave the new mastic alone while it firms up. It forms a skin fairly soon, but takes longer to harden fully.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
Different surfaces, different methods
Stone surrounds
Stone surrounds suit sand mastic well. It finishes to look like part of the surround.
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We can do one window or several.
Also near Penshurst
More services for Penshurst
Why it’s worth doing now in Penshurst
New sash windows are a major, costly change, and in listed buildings it may need consent. Where the frames are in good order, new mastic seals the surround. Where a wall is exposed, as many are in small places like Penshurst, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, call 0345 464 0079 or send us an email and we will give you an honest view and a quote.
Why book with us
- We leave the area clean and tidy
- Quality sealants from Arbo and Everbuild
- Rated 4.9 stars on Google
- Fully insured
Read our cost guide or what customers say.
Windows and doors in Penshurst
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Penshurst Place (about 0.4 miles north-east) are a reminder that the area around Penshurst has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you look after a building such as Penshurst Church of England Voluntary Aided Primary School, the mastic around its windows and doors needs looking after like any other building’s. Letting a property close to Penshurst station? Then older sash windows in a rental need their mastic kept sound to keep the weather out. Homes close to Church of St John the Baptist include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Penshurst is about 5 miles north-west of Royal Tunbridge Wells, in Kent. Our applicators cover sand mastic for homes and businesses in Penshurst and nearby, as part of our work across Kent. Penshurst is one of 922 places in Kent we cover. There’s also a page for Crawley, roughly 16 miles from Penshurst.
We cover every part of the TN11 postcode area for sand mastic and the streets around it. Local streets include High Street, The Warren and Beckets Field, and we cover them all. We also cover the places around Penshurst: Chiddingstone Hoath (2 miles west), Walter's Green (2 miles south), Chiddingstone Causeway (2 miles north), Fordcombe (2 miles south) and Teasley Mead (3 miles south-west). We also work in nearby towns such as Sevenoaks (8 miles north), Royal Tunbridge Wells (5 miles south-east), Tonbridge (5 miles north-east), Kings Hill (12 miles north-east), Paddock Wood (9 miles east) and Southborough (4 miles east).
Near you in Penshurst
Locally, jobs take us to homes and businesses close to Chiddingstone Castle Park and Gardens and The Leicester Arms Hotel, among other places. The closest station to Penshurst is Penshurst station, roughly 1.8 miles north. Other landmarks nearby include Tonbridge Cottage Hospital (4.2 miles east) and Chiddingstone Castle (1.8 miles north-west). The countryside around Penshurst includes Broadwater Warren RSPB Reserve and Barden Lake.
How it works
We bring everything the job needs with us, so there’s nothing for you to buy. Once we’ve agreed what’s being done, the area is protected and the work begins. It normally takes a few hours per window, depending on the condition of the joints. In a small place like Penshurst, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any water getting in
- Mention any tricky access
How to get a quote
For a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. We will send you a clear quote before any work starts.
Read more
For landlords and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
We work for letting agents and landlords as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
Penshurst: your questions answered
Is Penshurst within the area you cover?
Yes. Penshurst is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you do sand mastic in Penshurst?
Yes. We work across London and the South East, and Penshurst is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing, and we will send you a clear quote.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme.
Can sand mastic be painted?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we will talk you through it.
What sealant do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we will tell you what we’re using.
Can you match the sealant colour?
Normally, yes. White, clear and grey are common, and other colours are available for many products, and we will agree it with you first.
Will it make a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
How long does sand mastic take to go off?
The surface skins quite quickly and it hardens fully over a longer time. The weather and joint depth both affect it.
DIY versus a professional finish
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What we can’t put right
Sealant is not the answer to every problem, and we’ll tell you before we start. It will not solve:
- Sashes that rattle, stick or will not open
- Decayed frames that need repair
- Decisions on consent for listed homes
If in doubt, call 0345 464 0079 or email us and we will say what we think.
Where we work in Penshurst
- Stone surrounds
- Tenement windows
- Timber door frames
- Period & listed homes
- Brick reveals
- Sash and case windows