Hampshire · England
Sand mastic for sash & case windows in Newnham, Hampshire
Specialist sand mastic for Newnham: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Modern sealant on a period surround
- Cement or filler used on old window joints that has cracked
- Mastic that needs renewing before redecorating
What sand mastic looks like in Newnham
Historic houses like The Vyne (about 4.6 miles west) are a reminder that the area around Newnham has older buildings as well as new. In older buildings, 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near Hook station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Newnham is about 5 miles east of Basingstoke, in Hampshire. We carry out sand mastic for homes and businesses in Newnham and nearby, as part of our work across Hampshire. Newnham is one of 683 places in Hampshire we cover. Our Reading page covers work nearby.
Here we cover the RG27 postcode area for sand mastic. That includes homes and businesses on Tylney Lane, Newnham Lane and Ridge Lane and the roads around them. We also cover the places around Newnham: Nately Scures (1 mile south), Hook Common (1 mile south-east), Up Nately (1 mile south), Hook (1 mile east) and Warnborough Green (2 miles south-east). We also work in nearby towns such as Basingstoke (5 miles west), Farnborough (10 miles east), Fleet (7 miles east), Aldershot (10 miles east), Alton (9 miles south) and Yateley (8 miles north-east).
Landmarks near Newnham
The nearest railway station is Hook station, roughly 1.2 miles east. Nearby you’ll also find Odiham Castle (1.9 miles south-east) and Basing House (2.8 miles west). For a walk, there’s Dogmersfield Lake and Tundry Hill.
About our sand mastic in Newnham
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder, applied by hand. On older homes, it suits the building far better than silicone. If you’re dealing with tired mastic found when preparing windows for paint and failed mastic on an exposed elevation, we can help.
Mastic can only go onto a dry, clean joint, so window work in Newnham is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
The work is covered for a year after we finish. If there’s a problem with it, please ring 0345 464 0079 or send us an email.
- Place
- Newnham (RG27)
- Region
- Hampshire
- Guarantee
- One year on every job
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
When to call us in Newnham
Timber frames move with the seasons. The movement cracks the mastic little by little.
Most people get in touch when they notice something like this:
- Gaps between timber frames and stone or brick
- Crumbling sand mastic round a window
- Cement or filler used on old window joints that has cracked
- Wind and rain getting in round a sash window
Homes close to Church of St. Nicholas include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What to look for in a quote
- The length of the guarantee
- What product goes in the joint
- Whether all the old sealant comes out first
- Who turns up on the day
Places near Newnham
More services for Newnham
Newnham: your questions answered
Can you help a landlord with a rental near Hook station?
Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.
Can you do sand mastic in Newnham?
Yes. We work across London and the South East, and Newnham is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
When will the new mastic be hard?
It forms a skin fairly soon and it hardens fully over a longer time. The weather and joint depth both affect it.
Do I need permission for sand mastic on a listed building?
Your local planning authority is the one to ask. They’ll tell you if consent is needed.
Are you insured?
Yes. We’re fully insured.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Can you seal over the old sealant?
No. Fresh sealant doesn’t stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Aftercare tips
Good habits help new joints last longer. Our tips:
- Have rotten timber repaired before new mastic goes in
- Ask us before painting near the mastic
- Sort the mastic before the decorators arrive
- Avoid heavy scraping on the mastic joint
Don’t touch or press the mastic while it hardens. It forms a skin fairly soon, but takes longer to harden fully.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall, so renewing it early is worth it.
Different surfaces, different methods
Stone surrounds
Sand mastic sits naturally against stone. It finishes to look like part of the surround.
Brick reveals
An open joint at a brick reveal lets weather in. Renewing the mastic closes it.
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Whether work needs listed building consent
- Masonry that needs repairing
- Cracked or broken glass
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly before you book.
What we seal
- Period & listed homes
- Brick reveals
- Timber door frames
- Tenement windows
- Stone surrounds
- Sash and case windows
How it works
You do not need to clear the whole room or building, just the space around the work. Everything nearby is protected, and the work takes a few hours for a single window, longer for several in most cases. Somewhere as small as Newnham, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- For business premises, tell us about site rules or sign-in
- Tell us if parking is tricky
Get a quote
If you are in Newnham and need sand mastic, phone 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.
Related advice
Why deal with it now?
An open joint round the frame lets weather in. Left, water can reach the timber and the wall so renewing it early protects the window. Where a wall is exposed, as many are in small places like Newnham, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
The cost reflects the work involved, not guesswork. That is why we ask a few questions first.
Why Newnham customers choose us
- 4.9 on Google from 180+ five-star reviews
- An ARBOMaster approved applicator
- We’re fully insured
- Trusted Arbo and Everbuild sealants
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
We also work for property managers and facilities teams. We can quote a run of properties together.