Hampshire · England
Sand mastic for sash & case windows in Harestock, Hampshire
Sand mastic in Harestock from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Mastic round period door frames that has failed
- Patchy fillers round a sash window
- Wind and rain getting in round a sash window
Sand mastic for homes and businesses in Harestock
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. Typical jobs include draughts and rain around sash boxes and crumbling sand mastic round a window, across sash and case windows, timber door frames and brick reveals.
Many houses in smaller places like Harestock have conservatories, garden rooms or patio doors. Their glazing joints and frame seals are as much a part of the job as the windows.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Harestock (SO22)
- Region
- Hampshire
- Cover
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
Good habits help new joints last longer. Our tips:
- Keep modern sealant off the mastic
- Look over the window mastic once a year
- Make sure water runs off the sill
- Ask the planning authority about consent for listed or conservation-area homes
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall, so renewing it early is worth it.
What affects the cost of sand mastic
Every job gets its own quote. These are the things that affect it:
- Whether the work is at height
- Which sealant suits the joint
- How many rooms, windows or areas are involved
- Mould in or behind the old joints
What it costs depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts.
What we need to know
What to tell us when you ask for a quote:
- What’s wrong with the joints now
- The address or postcode of the job
- If someone has resealed it before
- How we’d reach the joints
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved before giving you a price.
What sealant work cannot fix
To be straight with you, there are a few things sealant won’t fix:
- Sash cords, weights and draught-proofing of the sashes
- Damaged stone surrounds
- Rotten sashes, sills or window boxes (a joiner’s job)
If you are not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer.
What we seal
- Tenement windows
- Sash and case windows
- Brick reveals
- Stone surrounds
- Timber door frames
- Period & listed homes
What we are called out for in Harestock
Decorating can disturb tired mastic. It’s often found when windows are being prepared for paint, which is a good time to renew it.
Signs it’s time to call us include:
- Mastic round period door frames that has failed
- Draughts and rain around sash boxes
- Mastic that needs renewing before redecorating
- Gaps between timber frames and stone or brick
Letting a property close to Winchester station? Then any sash windows need sound mastic to keep draughts and rain out.
What your quote should include
- What preparation is included
- Which colour the sealant will be
- Who turns up on the day
- Whether the sealant suits the joint
Frames and glazing around Harestock
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.
If you live in an older home near Saint Barnabas, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you look after a building such as Harestock Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Harestock is about 2 miles north-west of Winchester, in Hampshire. Homes, rented property, offices and hotels in Harestock is covered for sand mastic. The work is guaranteed for a year. Across Hampshire, we cover 683 places, and Harestock is one of them. For nearby work, see our Southampton page (12 miles or so).
Work in SO22 works the same way as everywhere else we cover. That includes homes and businesses on Kennel Lane, Burley Road and Stoney Lane. Nearby, we also carry out sand mastic in Littleton (1 mile north-west), Weeke (1 mile south), Abbotts Barton (1 mile south-east), Hyde (1 mile south-east) and Headbourne Worthy (1 mile north-east). We also work in nearby towns such as Eastleigh (8 miles south), Andover (11 miles north-west), Totton (14 miles south-west), Chandler's Ford (7 miles south), Hedge End (12 miles south) and Romsey (9 miles south-west).
Local landmarks in Harestock
Around Harestock, our work takes us to homes and buildings near Henry Beaufort School and The Running Horse pub. For rail, the closest station is Winchester station, about 1.2 miles south-east of the centre. Other landmarks nearby include Royal Observer Corps Museum (1.1 miles south-east) and Royal Hampshire County Hospital (1.5 miles south). The countryside around Harestock includes Twyford Down and Winnall Moors.
Landlords, agents and businesses in Harestock
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will quote.
Hotels need rooms back in use, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
Also near Harestock
Also in Harestock
Harestock: your questions answered
Do you cover Harestock for sand mastic?
Yes. Our work covers London and the South East, and Harestock is part of that. You can call 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear quote.
Do you cover smaller places like Harestock?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
How do I get a quote for sand mastic in Harestock?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
What should I tell you?
Tell us what needs doing and where. We’ll ask anything else we need to know.
Can you work on commercial sites?
Yes. We can plan bigger jobs in stages to suit the site.
Should I try DIY first?
It depends on the job. 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.
Where do you work from?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Can old silicone round a sash window be swapped for sand mastic?
Yes, we do this often. The old silicone has to come out completely so the mastic beds in well.
Can I do it myself?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
The process
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. After a quick look at the joints together, the area is protected and the work begins. Most jobs take anything from a few hours to a full day, depending on how many windows. A visit to Harestock is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We check the window surrounds and agree which joints need renewing.
- 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.
- The mastic is finished to sit tidily against the stone or brick.
Getting ready for the visit
- Mention any tricky access
- Clear the area around the work
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or drop us an email.