West Berkshire · England
Sand Mastic in Ashmansworth
We cover Ashmansworth for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Draughts and rain around sash boxes
- Mastic worn away on windows facing the weather
- Mastic round period door frames that has failed
About our sand mastic in Ashmansworth
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. Out comes the old, loose mastic, the joint is prepared and new mastic is shaped by hand. We work on tenement windows, period & listed homes and brick reveals, and common reasons people get in touch are open joints round the window box and patchy fillers round a sash window.
In a village or hamlet like Ashmansworth, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we will put it right.
- Location
- Ashmansworth (RG20)
- Wider area
- West Berkshire
- Cover
- 12 months on all our work
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
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 call for the right materials, safe access and experience.
If you’ve already had a go yourself, that is fine. We cut it out and start again.
How to look after the new joints
Looking after new joints is easy:
- Inspect the joints round the windows every year or so
- Ask the planning authority about consent for listed or conservation-area homes
- Make sure water runs off the sill
- Sort the mastic before the decorators arrive
Look at the mastic when you look over the windows. Small cracks are easier to deal with early.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber, which can lead to rot.
What the job involves on each surface
Period and listed homes
On a listed home or in a conservation area, the right material matters. Like-for-like sand mastic is usually favoured.
Stone surrounds
Stone openings are rarely perfectly straight, so the gap is not the same all the way round. Sand mastic is shaped by hand to suit.
Windows and doors in Ashmansworth
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. With historic houses such as Highclere Castle (about 1.9 miles north-east) nearby, there’s older building stock in the area around Ashmansworth as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
In the older streets around Church of St James, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Around Ashmansworth, as everywhere, sand mastic is only as good as the preparation behind it.
Ashmansworth is about 7 miles south-west of Newbury, in West Berkshire. If you need sand mastic in Ashmansworth, please ring 0345 464 0079 or send us an email for a quick quote. We’re based in Crawley and cover West Berkshire, Ashmansworth included. 155 places in West Berkshire are on our list, large and small. Our Reading page covers work nearby.
Every address in RG20 is covered for sand mastic. Other places close to Ashmansworth include Test Valley (1 mile west), Vernham Street (4 miles west), Hell Corner (5 miles north-west), Upper Green (5 miles north-west) and Inkpen Common (5 miles north-west). Within a short drive, we also cover Newbury (7 miles north-east), Thatcham (9 miles north-east), Speenhamland (7 miles north-east), Hungerford (8 miles north-west), Lambourn (14 miles north) and Shaw (7 miles north-east).
Local landmarks in Ashmansworth
For a walk, there’s Sidown Hill.
The process
At the end, we look at the finished work together and explain the cure time. The visit itself generally takes a few hours for a single window, longer for several, depending on the amount of work. Somewhere as small as Ashmansworth, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Mention any leaks or damp you’ve noticed
- Let us know about parking restrictions
- Clear the area around the work
How to get a quote
We do not publish a price list, because every job is different. Instead, we give you a clear price for your job. To arrange one, ring 0345 464 0079 or drop us an email.
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For landlords and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll quote.
We work for landlords and letting agents as well as householders. Sealant work between tenants keeps a property looking cared for before the next move-in.
How we quote for sand mastic
There’s no set price list, because jobs vary so much. What we look at:
- When we can work, for business premises
- The product the joint needs
- Whether there’s mould to deal with
- The number and length of the joints
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
What to tell us for a quote
When you contact us, it’s useful to know:
- Any access issues, like height or stairs
- Pictures of the joints, sent by email
- Where the job is, and your postcode
- If someone has resealed it before
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Places near Ashmansworth
Other services in Ashmansworth
Ashmansworth questions
Will you come out to Ashmansworth?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is Ashmansworth in your area for sand mastic?
Yes, Ashmansworth is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or send us an email and let us know what needs doing.
Do you hold any approvals?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Can you replace silicone on a period window with sand mastic?
In most cases. We remove the silicone and clean the joint before the sand mastic goes in.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area.
Do you take out the old sealant first?
Yes, every time. New sealant will not bond properly to old, so the joint is cleaned back first.
Is it possible to paint over sand mastic?
Sand mastic is normally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Can you quote for more than one area?
Yes, and it often makes sense. Doing several areas at once is normally more efficient.
Why act early in Ashmansworth
Filling over old, loose mastic does not last. Raking out and preparing the joint gives it a sound base so the new work lasts. Around Ashmansworth, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we will explain what it covers.
Why choose Mr Mastic in Ashmansworth
- Domestic, commercial and hotel work
- 12-month guarantee on every job
- Quality sealants from Arbo and Everbuild
- 20+ years of sealant experience
Take a look at what affects the cost and what customers say.