Hampshire · England
Sand mastic for sash & case windows in North Waltham, Hampshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for North Waltham, backed by a one-year guarantee. Ask us for a quote.
- Draughts and rain around sash boxes
- Mastic worn away on windows facing the weather
- Modern sealant on a period surround
Sand mastic in North Waltham
We renew sand mastic around sash windows and doors in stone and brick. Out comes the old, loose mastic, and new mastic is applied and shaped by hand. If you’re dealing with failed mastic on an exposed elevation and patchy fillers round a sash window, we can put it right, whatever the surface.
Mastic can only go onto a dry, clean joint, so window work in North Waltham is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
Each job carries a 12-month guarantee.
- Place
- North Waltham (RG25)
- Wider area
- Hampshire
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
When to call us in North Waltham
Over the years, sand mastic weathers. It dries out, cracks and loses its grip on the stone or timber.
These are the problems we are asked about most:
- Old cement repairs round a window that have failed
- Tired mastic found when preparing windows for paint
- Draughts and rain around sash boxes
- Cracked mastic round a front door frame
For site and facilities teams at buildings such as North Waltham Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Comparing quotes
- Who turns up on the day
- Whether you can choose the colour
- What happens if the job turns out different
- Which sealant they’ll use, and why
Why deal with it now?
Filling over old, loose mastic doesn’t last. We remove the loose material first so the new work lasts. In a small place like North Waltham, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
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’ll know the price before we begin.
Why North Waltham customers choose us
- Any old sealant cut out fully, not covered over
- Over 20 years’ experience
- Quality sealants from Arbo and Everbuild
- 4.9 on Google from 180+ five-star reviews
See what affects the cost or our reviews.
Aftercare tips
To keep the joints looking good and working properly:
- Go gently near the mastic when preparing windows
- Get any rot dealt with first
- Look over the window mastic once a year
- Leave the new mastic unpainted
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
What we do, step by step
Once we are on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes anything from a few hours to a full day, depending on how many windows. Somewhere like North Waltham 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 check the window surrounds and agree which joints need renewing.
- We rake out the old mastic and clean the joint.
- Deep voids are packed so the mastic is the right thickness.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- Let us know about stairs, lifts or work at height
- Tell us about any previous sealing or DIY attempts
- Let us know about parking restrictions
Ask for a quote
Every job is quoted individually, so start by telling us what you need. Simply ring 0345 464 0079 or email us and describe the job and send photos if you have them.
Read more
When something else is needed
It helps to know what we can’t do too:
- Whether work needs listed building consent
- Putty and glazing repairs
- Sashes that need overhauling
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly.
Surfaces we seal
- Timber door frames
- Brick reveals
- Period & listed homes
- Stone surrounds
- Sash and case windows
- Tenement windows
Frames and glazing around North Waltham
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to Church of St. Michael's include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in. For landlords with property near Micheldever station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
North Waltham is about 5 miles south-west of Basingstoke, in Hampshire. Jobs in North Waltham get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our Hampshire coverage runs to 683 places, and North Waltham is one of them. Our Reading page covers work nearby.
Every address in RG25 is within our area for sand mastic, from the main roads to the quietest streets. You’ll find streets such as Church Road, Chapel Street and Cuckoo Close, and we cover them all. If you’re just outside North Waltham, we cover Dummer (2 miles east), Oakley (3 miles north), Kempshott (3 miles north-east), Newfound (3 miles north) and Farleigh Wallop (4 miles east). Further out, we also cover Basingstoke (5 miles north-east), Winchester (12 miles south-west), Andover (12 miles west), Alton (10 miles south-east), Tadley (10 miles north) and Hook (11 miles north-east).
Landmarks near North Waltham
We work in homes and buildings around The Fox pub and the streets around them. North Waltham’s nearest station is Micheldever station, roughly 3.6 miles south-west. Nearby you will also find Park Prewett Hospital (5.6 miles north-east). Open spaces near North Waltham include Farleigh Hill.
North Waltham questions
Is North Waltham in your area for sand mastic?
Yes. Our work covers London and the South East, and North Waltham is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
I let a flat near Micheldever station. Can you help?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before work begins.
Can I paint the new mastic?
Sand mastic is normally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Can I choose the sealant colour?
We help you choose a colour that suits. The choice depends on the product the joint needs.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Do I need permission for sand mastic on a listed building?
Yes, it’s worth checking. Your local planning authority can say if consent is needed for listed or conservation-area properties.
Do you take out the old sealant first?
Yes, always, and completely. New sealant will not bond properly to old, so the joint is cleaned back first.
Will there be a smell?
That depends on the sealant. Some products have a noticeable smell, others very little.
How we quote for sand mastic
Jobs vary more than people expect. What affects the quote:
- The size of the job
- Whether the work is at height
- Which sealant suits the joint
- Whether there’s mould to deal with
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you are unsure, call 0345 464 0079 or send us an email for an honest opinion and a quote.
Asking for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- If someone has resealed it before
- Whether it’s a home or a business
- Where the property is
- Access, such as stairs, a lift or height
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You will have a clear quote before work begins.
Nearby places to North Waltham
What else we do in North Waltham
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.