Oxfordshire · England
Sand mastic for sash & case windows in Highmoor Cross, Oxfordshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Highmoor Cross and across Oxfordshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Open joints round the window box
- Silicone on a period window that looks wrong
- Cement or filler used on old window joints that has cracked
Sand mastic in Highmoor Cross
Silicone on a period window often looks wrong and is not always the right material. Sand mastic is the traditional choice, and we can replace one with the other. If you have window mastic to renew ahead of painting and open joints round the window box, we can help, on tenement windows, timber door frames and brick reveals alike.
Around Highmoor Cross, 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.
Every job comes with our 12-month guarantee.
- Where
- Highmoor Cross (RG9)
- Region
- Oxfordshire
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
For landlords and businesses
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Looking after it afterwards
So the new joints stay in good condition:
- Plan mastic work ahead of painting
- Leave the new mastic unpainted
- Inspect the joints round the windows every year or so
- Take care around the mastic when scraping paint
Leave the new mastic alone while it firms up. It forms a skin fairly soon, but takes longer to harden fully.
Once mastic starts to crumble, rain gets in. It can soak into the frame and the surrounding masonry so early renewal protects both.
When to call us in Highmoor Cross
Timber swells and shrinks with the weather. That movement opens up the mastic joint over time.
Any of these means the joints need attention:
- Gaps between timber frames and stone or brick
- Gaps round a timber door in stone or brick
- Mastic that needs renewing before redecorating
- Modern sealant on a period surround
For an older house near a landmark such as Church of St Paul, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Comparing quotes
- How the joint is cleaned and prepared
- What the cure time is
- Whether you can choose the colour
- Who turns up on the day
Highmoor Cross: your questions answered
Can you help a landlord with a rental near Henley-On-Thames station?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or email us and tell us about the property, and we’ll send you a clear quote.
Will you come out to Highmoor Cross?
Yes. Highmoor Cross is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you offer different sealant colours?
Most of the time, yes. We will explain which colours are available and agree one before any work starts.
What’s sand mastic made of?
A traditional pointing material made from sand and a linseed-oil-based binder for the joint between timber frames and masonry.
Can you quote for more than one area?
Yes. Just list everything you need.
Which is right for my windows, sand mastic or modern sealant?
It depends on the window. Period windows in stone or brick usually suit sand mastic and newer frames generally get a flexible sealant.
Is it possible to paint over sand mastic?
Sand mastic is normally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
How long does sand mastic take?
It depends on the size of the job, but most jobs take a few hours per window, depending on the condition of the joints. We’ll tell you when we quote.
Also near Highmoor Cross
More services for Highmoor Cross
When it is not the sealant
It helps to know what we can’t do:
- Putty and glazing repairs
- Crumbling stone or brickwork round the window
- Timber that has rotted
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Sash and case windows
- Timber door frames
- Stone surrounds
- Tenement windows
- Brick reveals
- Period & listed homes
Sand mastic in Highmoor Cross: local notes
Historic houses like Greys Court (about 1.6 miles east) are a reminder that the area around Highmoor Cross 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, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Henley-On-Thames station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
Highmoor Cross is about 5 miles north of Caversham, in Oxfordshire. We provide sand mastic to homes and businesses in Highmoor Cross and nearby. Across Oxfordshire, we cover 443 places, and Highmoor Cross is one of them. We also work in Reading, around 7 miles away.
We work across the RG9 postcode area for sand mastic. Streets in the area include Holly Close and The Glebe, and we cover them all. We also cover Highmoor (1 mile north-west), Shepherd's Green (1 mile south-east), Kingwood Common (1 mile south), Catslip (1 mile north) and Nettlebed (2 miles north). Larger places within reach include Didcot (12 miles west), Abingdon-on-Thames (15 miles north-west), Thame (13 miles north), Henley-on-Thames (4 miles east), Benson (7 miles north-west) and Chinnor (11 miles north).
Around Highmoor Cross
Around Highmoor Cross, our work takes us to homes and buildings near The Dog and Duck pub, among other places. Highmoor Cross’s nearest station is Henley-On-Thames station, roughly 4.1 miles east. Green spaces nearby include Warburg Nature Reserve.
How the visit works
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, do the work and tidy away. Most jobs take anything from a few hours to a full day, depending on how many windows. For a village or hamlet like Highmoor Cross, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Clear items away from the joints we’re working on
- Keep pets and children clear of the area while we work
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or email us.
Read more
Quotes for sand mastic in Highmoor Cross
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Working hours on commercial sites
- How many areas need sealing
- Mould in or behind the old joints
- Whether old sealant or filler has to be cut out
The cost reflects the work involved, not guesswork. That’s why we ask about the job first.
What to tell us for a quote
There’s no need for technical detail. It helps if you can tell us:
- How we’d reach the joints
- The problem you’ve noticed
- If someone has resealed it before
- Photos by email, if that is easy
Getting a quote is simple: let us know the job and the location and its rough size. A few pictures by email make the job easier to understand, and we will take it from there.
What the job involves on each surface
Stone surrounds
Old stone surrounds are often uneven, so the gap is not the same all the way round. Sand mastic is shaped by hand to suit.
Period and listed homes
Period homes look their best with traditional materials.