Buckinghamshire · England
Sand mastic for sash & case windows in Westcott, Buckinghamshire
Sand mastic for Westcott and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Draughty sash windows at the surround
- Mastic that needs renewing before redecorating
- Crumbling sand mastic round a window
Why deal with it now?
If you’re redecorating, renew the mastic first. Painting over failed mastic doesn’t seal it and traditional guidance is to leave the new mastic unpainted. In a small place like Westcott, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
Why book with us
- Anti-fungal sanitary silicone in wet areas
- An ARBOMaster approved applicator
- Old sealant always removed completely
- Over 20 years’ experience
Sand mastic for homes and businesses in Westcott
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. We are often asked to deal with failed mastic on an exposed elevation and window mastic to renew ahead of painting, on stone surrounds, timber door frames and sash and case windows.
Homes in small places like Westcott 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.
You get a 12-month guarantee, the same in Westcott as everywhere else we work.
- Location
- Westcott (HP18)
- Wider area
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Renew mastic before redecorating the windows
- Ask us before painting near the mastic
- Look over the window mastic once a year
- Make sure water runs off the sill
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look before trying a quick fix.
An open joint round the box lets weather through. Left, the gap tends to get bigger.
Westcott questions
Do you cover Westcott for sand mastic?
Yes, Westcott is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job, and we’ll send you a clear quote.
Is Westcott within the area you cover?
Yes, Westcott is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can I paint the new mastic?
Sand mastic is normally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Should I use sand mastic or silicone?
We will talk it through with you. Sand mastic suits many period homes and newer frames suit modern sealant.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Will it make a mess?
We keep the work tidy. We protect what’s around the joints, and we clear up when we’re done.
Does someone need to be in?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
How we quote for sand mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The type of sealant required
- Whether old sealant or filler has to be cut out
- Any working-time requirements on site
- How many areas need sealing
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Ask us for a quote and we’ll explain what it covers.
Helping us quote
When you contact us, it’s useful to know:
- How we’d reach the joints
- Where the job is, and your postcode
- What the problem is, such as mould, gaps, leaks or cracking
- Roughly how big the job is
To get a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. You’ll have a clear quote before work begins.
What we can’t put right
We will not take on work that won’t last, so here’s what sealant can’t put right:
- Sashes that need overhauling
- Decisions on consent for listed homes
- Crumbling stone or brickwork round the window
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think.
What we seal
- Sash and case windows
- Brick reveals
- Period & listed homes
- Stone surrounds
- Tenement windows
- Timber door frames
Surface by surface
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It gives a traditional finish.
Period and listed homes
Period homes look their best with traditional materials.
The process
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes a few hours per window, depending on the condition of the joints. For a village or hamlet like Westcott, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
How to prepare
- For business premises, tell us about site rules or sign-in
- Let us know about stairs, lifts or work at height
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. Whenever you are ready, ring 0345 464 0079 or email us.
Advice
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Windows and doors in Westcott
Historic houses like Waddesdon Manor (about 0.9 miles east) are a reminder that the area around Westcott 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. 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.
In the older streets around Church of St Mary, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Schools such as Westcott Church of England School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. For landlords with property near Aylesbury Vale Parkway station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Westcott is about 6 miles west of Aylesbury, in Buckinghamshire. From the centre of Westcott to the outskirts, we cover sand mastic for every kind of property. Our area takes in 263 places across Buckinghamshire. Our Oxford page covers work nearby (14 miles or so).
Postcode districts we cover here for sand mastic: HP18. Sand mastic is available to properties on High Street, Lower Green and Ashendon Road and the roads around them. We also cover the places around Westcott: Waddesdon (1 mile east), Wormstone (2 miles east), Ashendon (2 miles south-west), Kingswood (2 miles north-west) and Upper Winchendon (2 miles south-east). We also work in nearby towns such as Aylesbury (6 miles east), Buckingham (10 miles north), Elmhurst (6 miles east), Southcourt (7 miles south-east), Princes Risborough (10 miles south-east) and Haydon Hill (5 miles east).
Landmarks near Westcott
Locally, jobs take us to homes and businesses close to Waddesdon Church of England School and the streets around them. Westcott’s nearest station is Aylesbury Vale Parkway station, roughly 4.2 miles east of the centre. Well-known places in the area include St John's Hospital (4.6 miles south-east) and Dinton Castle (4.4 miles south-east). Not far away are Upper Ray Meadows.