West Berkshire · England
Sand mastic for sash & case windows in Donnington, West Berkshire
Our applicators work in Donnington on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly.
- Mastic that needs renewing before redecorating
- Patchy fillers round a sash window
- Silicone on a period window that looks wrong
Sand mastic for homes and businesses in Donnington
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant and we will explain which is best for yours. We work on brick reveals, sash and case windows and stone surrounds, and the jobs we see most are draughty sash windows at the surround and mastic round period door frames that has failed.
Outdoor sealant needs dry, clean surfaces, so work on frames around Donnington is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
Every job is covered by our 12-month guarantee, wherever you are in West Berkshire.
- Where
- Donnington (RG14)
- Wider area
- West Berkshire
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Get any rot dealt with first
- Avoid patching sand mastic with silicone
- Ask the planning authority about consent for listed or conservation-area homes
- Look over the window mastic once a year
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
Why deal with it now?
Cement-based fillers and modern sealants don’t always suit a period surround. Sand mastic is the like-for-like choice, which can matter on listed and conservation-area homes. Older cottages and farmhouses around Donnington can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You will know the price before we begin.
What you get with us
- Anti-fungal silicone where joints get wet
- Homes, businesses and hotels
- Rated 4.9 stars on Google
- Tidy, careful work
Take a look at what affects the cost or customer reviews.
Landlords, agents and businesses in Donnington
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Housing providers, facilities teams and property managers book us too in Donnington and across West Berkshire. We can quote a run of properties together, and we’re fully insured.
How the job changes by surface
Tenement and terrace windows
Windows above ground floor need the right access. Tell us the height and we will confirm what’s needed.
Timber door frames
Round a period front door, sand mastic gives the right look.
The process
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours per window, depending on the condition of the joints. Somewhere like Donnington needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by checking each surround and agreeing the joints to renew.
- We rake out the old mastic and clean the joint.
- We pack any deep gaps so the mastic sits at the right depth.
- The mastic is mixed, pressed into the joint by hand and shaped.
- We dress the surface so it sits neatly against the masonry.
Getting ready for the visit
- Tell us about any water getting in
- Keep pets and children clear of the area while we work
- Clear the area around the work
Get a quote
For a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. You’ll have a clear quote before work begins.
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Also near Donnington
Also in Donnington
Windows and doors in Donnington
Historic houses like Shaw House (about 0.7 miles south-east) are a reminder that the area around Donnington has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you let a flat or house near Newbury station, any sash windows need sound mastic to keep draughts and rain out. In the older streets around Parish Church of St Mary, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Donnington is about 1 mile north of Newbury, in West Berkshire. Homes, rented property, offices and hotels in Donnington is covered for sand mastic. Every job comes with our 12-month guarantee. Donnington is one of 155 towns and villages in West Berkshire where we work for sand mastic. You can also see our page for Reading, about 15 miles away.
Here we cover the RG14 postcode area for sand mastic. You will find streets such as The Orchids, The Redcoats and Cannon Close. We also cover Speenhamland (1 mile south), Shaw (1 mile south-east), Bagnor (1 mile south-west), Speen (1 mile south-west) and Stockcross (2 miles west). Further out, we also cover Thatcham (3 miles east), Burghfield Common (12 miles east), Hungerford (8 miles west), Calcot (12 miles east), Lambourn (11 miles north-west) and Burghfield Hill (12 miles east).
Near you in Donnington
In Donnington, that means homes and buildings near Trinity School, Victoria Park and The Castle pub. The closest station to Donnington is Newbury station, roughly 1.5 miles south. Nearby you’ll also find Donnington Castle (less than half a mile west) and West Berkshire Community Hospital (1.9 miles south-east). For a walk, there’s Rack Marsh.
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, 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 doesn’t work out, we can still put it right.
Common problems we fix in Donnington
Most of it is simply age. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
Common reasons people contact us are:
- Wind and rain getting in round a sash window
- Crumbling sand mastic round a window
- Gaps round a timber door in stone or brick
- Mastic worn away on windows facing the weather
Managing a site like Shaw-cum-Donnington C.E. Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Before you book anyone
- Whether VAT is included
- What guarantee comes with the work
- What insurance they hold
- What happens if the job turns out different
Your questions about sand mastic in Donnington
Do you cover Donnington for sand mastic?
Yes. Our work covers London and the South East, and Donnington is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Can you help a landlord with a rental near Newbury station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we will send you a clear quote.
Is there any odour?
That depends on the sealant. Some smell for a while, some hardly at all.
Can I do it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Will it make a mess?
We keep the work tidy. We protect what’s around the joints.
Can old silicone round a sash window be swapped for sand mastic?
In most cases. The silicone is cut out and the joint cleaned before the sand mastic goes in.
Can new sealant go over the old?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Where are you based?
We work from Crawley. Our applicators cover Donnington.