West Berkshire · England
Sand mastic for sash & case windows in Newbury, West Berkshire
Our applicators work in Newbury on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Failed mastic on an exposed elevation
- Old sand mastic that has cracked, crumbled or fallen out
- Modern sealant on a period surround
Sand mastic for homes and businesses in Newbury
Sand mastic skins over fairly quickly but full hardening takes longer. Traditionally, sand mastic is left unpainted, so ask us before you decorate. If you’re dealing with failed mastic on an exposed elevation and mastic round period door frames that has failed, we can put it right, on timber door frames, tenement windows and sash and case windows alike.
Newbury mixes older streets, where windows have often been replaced, with newer estates fitted with uPVC. All of them depend on a sound bead of mastic between frame and wall.
We stand behind the work with a one-year guarantee, so you’re covered after we have gone.
- Where
- Newbury (RG14, RG19, RG18, RG20)
- Wider area
- West Berkshire
- Cover
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Landlords, agents and businesses in Newbury
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.
Places near Newbury
Also in Newbury
Why deal with it now?
Filling over old, loose mastic doesn’t last. Raking out and preparing the joint gives it a sound base so the new work lasts. Black mould and gaps in sealant do not fix themselves, and in a busy home in Newbury they get worse with every use. Now is the easy time to put it right.
Doing several joints on one visit normally makes better use of the time than several visits. We will send you a clear quote for the lot.
Why Newbury clients choose us
- Every job guaranteed for a year
- Experience in homes, commercial sites and hotels
- Trusted Arbo and Everbuild sealants
- Any old sealant cut out fully, not covered over
Read what affects the cost and customer reviews.
What the job involves on each surface
Tenement and terrace windows
Windows above ground floor need the right access. Let us know the floor and we will confirm access.
Sash and case windows
Sash windows are where we do most sand mastic work. We renew the mastic round each box.
Signs you need sand mastic in Newbury
Previous repairs in cement or silicone often trap water or crack away. They don’t suit the joint, and they normally need raking out.
The problems people normally mention when they call include:
- Mastic that needs renewing before redecorating
- Open joints round the window box
- Mastic worn away on windows facing the weather
- Draughts and rain around sash boxes
Homes close to St Nicolas Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What to look for in a quote
- Who turns up on the day
- What product goes in the joint
- What happens if the job turns out different
- What the quote includes, VAT included or not
What sand mastic looks like in Newbury
With historic houses such as Shaw House (about 1 mile north) nearby, there’s older building stock in the area around Newbury as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For site and facilities teams at buildings such as St Nicolas C.E. Junior School, larger buildings have plenty of frames, and the mastic around each one ages. Letting a property close to Newbury station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Newbury is about 15 miles west of Reading, in West Berkshire. Every kind of property in Newbury can book us for sand mastic. The work is guaranteed for a year. Our West Berkshire coverage runs to 155 places, and Newbury is one of them. We also work in Reading, about 15 miles from Newbury.
Work in RG14, RG19, RG18 and RG20 works the same way as everywhere else we cover. If you need sand mastic at a property on Market Street, London Road and Donnington Square or anywhere close by, we can help. Newbury sits on or near the A4 and A339, which makes travel easy. If you are just outside Newbury, we cover Greenham (1 mile south-east), Sandleford (1 mile south), Skinners Green (2 miles south-west), Wash Common (2 miles south-west) and Enborne (2 miles west). Larger places within reach include Thatcham (3 miles east), Burghfield Common (11 miles east), Hungerford (8 miles west), Spencers Wood (15 miles east), Calcot (12 miles east) and Lambourn (12 miles north-west). As one of the bigger places in West Berkshire, Newbury has homes, rented property and businesses of every kind.
Local landmarks in Newbury
Locally, jobs take us to homes and businesses close to Victoria Park, The Diamond Tap and St Bartholomew's School and the streets around them. There’s a railway station in Newbury itself: Newbury station. Other landmarks nearby include Donnington Castle (1.6 miles north-west) and West Berkshire Community Hospital (1.5 miles east). Open spaces near Newbury include Audrey's Meadow.
How the visit works
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and clear up. It usually takes a few hours per window, depending on the condition of the joints. A visit in Newbury needs access to the work and a place to park close by. For outside work, let us know about side access, gates and any upper-floor joints.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
How to prepare
- Let us know about earlier repairs to the joints
- Tell us about access, such as stairs, a lift or high-level joints
- For indoor joints, keep the area dry beforehand if you can
Get a quote
Every job is quoted individually. Simply phone 0345 464 0079 or email us and describe the job, and photos are welcome.
Advice
Should I try it myself first?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
Honest limits
To be straight with you, some problems need a different trade:
- Whether work needs listed building consent
- Decayed frames that need repair
- Sashes that rattle, stick or will not open
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly.
Surfaces we seal
- Sash and case windows
- Tenement windows
- Stone surrounds
- Brick reveals
- Period & listed homes
- Timber door frames
FAQs for Newbury
Is sand mastic in Newbury guaranteed?
Every job comes with our one-year guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Is Newbury in your area for sand mastic?
Yes. Our work covers London and the South East, and Newbury is part of that. Just call 0345 464 0079 or send us an email with a few details of the job.
Will the old sealant be removed?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Can you seal over the old sealant?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Is there any odour?
There can be a smell while the sealant cures, but it fades. Ventilation helps.
Should I use sand mastic or silicone?
For period timber windows in stone or brick, sand mastic is often the better fit. On modern frames, we’d normally use a flexible sealant.
Should I try DIY first?
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.
How long does sand mastic take to go off?
It takes a while. It skins first and hardens fully later, and we’ll tell you what to expect.