Hampshire · England
Sand mastic for sash & case windows in Twyford, Hampshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Twyford and across Hampshire. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Draughty sash windows at the surround
- Old sand mastic that has cracked, crumbled or fallen out
- Window mastic to renew ahead of painting
The process
We bring everything the job needs with us, 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. Somewhere as small as Twyford, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Keep pets and children clear of the area while we work
- Let us know if you’ve seen damp or leaks
Getting a quote
Need a quote? Please phone 0345 464 0079 or email us and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
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About our sand mastic in Twyford
A silicone bead around a sash window can look out of place and isn’t always the right material. Sand mastic is the traditional choice and we can swap the silicone for it. Typical jobs include old sand mastic that has cracked, crumbled or fallen out and tired mastic found when preparing windows for paint, on period & listed homes, timber door frames and tenement windows.
Mastic can only go onto a dry, clean joint, so window work in Twyford is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we will put it right.
- Place
- Twyford (SO21)
- Region
- Hampshire
- Cover
- A year, on every job
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Keeping the joints in good condition
So the new joints stay in good condition:
- Renew mastic before redecorating the windows
- Check with your local planning authority if your home is listed
- Ask a joiner to look at soft timber first
- Don’t run silicone over sand mastic
Do not run silicone over the new mastic. If you see a crack, ask us to take a look rather than patching it.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
What we cannot put right
Sealant is not the answer to every problem, and we will tell you before we start. It will not solve:
- Damaged stone surrounds
- Sashes that rattle, stick or won’t open
- Decisions on consent for listed homes
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think.
Joints and surfaces we work on
- Stone surrounds
- Timber door frames
- Sash and case windows
- Brick reveals
- Tenement windows
- Period & listed homes
Twyford homes and the weather
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For site and facilities teams at buildings such as Twyford St Mary's Church of England Primary School, larger buildings have plenty of frames, and the mastic around each one ages. If you live in an older home near Church of St Mary, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you let a flat or house near Shawford station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Twyford is about 3 miles south of Winchester, in Hampshire. Homes, rented property, offices and hotels in Twyford is covered for sand mastic, old or new, large or small. The work is guaranteed for a year. We cover 683 towns and villages across Hampshire, large and small. Our Southampton page covers work nearby.
Work in SO21 works the same way as everywhere else we cover. If you need sand mastic at a property on High Street, Roman Road and The Crescent or anywhere close by, we can help. With the B3335 close by, Twyford is simple for us to get to. We also cover Shawford (1 mile north-west), South Down (1 mile west), Compton (1 mile west), Otterbourne (1 mile south-west) and St Cross (2 miles north). Further out, we also cover Winchester (3 miles north), Eastleigh (4 miles south), Fareham (13 miles south-east), Andover (15 miles north-west), Horndean (15 miles south-east) and Totton (11 miles south-west).
What’s near Twyford
In Twyford, that means homes and buildings near Phoenix Inn and St. Cross Park and the streets around them. The nearest railway station is Shawford station, roughly 0.7 miles west of the centre. Well-known places in the area include Wolvesey Castle (2.8 miles north) and The Gurkha Museum (2.6 miles north). For a walk, there’s Twyford Down and Hockley Meadows.
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. Several properties can go on one quote.
Why act early in Twyford
Not every filler suits an old window surround. Sand mastic is the like-for-like choice and that can be important for listed homes. Older cottages and farmhouses around Twyford can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Why book with us
- Approved under the ARBOMaster scheme
- Any old sealant cut out fully, not covered over
- Every job guaranteed for a year
- Rated 4.9 stars on Google
Take a look at our cost guide or customer reviews.
DIY sealant or a professional job?
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, then guaranteed for a year.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
What affects the quote in Twyford
We quote each job individually. This is what makes a difference:
- Any mould that needs treating
- The number and length of the joints
- How easy the joints are to reach
- How many areas need sealing
What you pay reflects the work, not guesswork. That is why we ask a few questions first and give you a clear price before we start.
What to tell us for a quote
Photos by email are helpful but not essential. Try to tell us:
- How many joints, rooms or windows are involved
- Where the property is
- Whether it has been sealed before
- How we’d reach the joints
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or send us an email.
Your questions about sand mastic in Twyford
Can you do sand mastic in Twyford?
Yes, Twyford is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
Will you come out to Twyford?
Yes, Twyford is covered. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
What guarantee comes with the work?
Every job comes with our 12-month guarantee, and we are fully insured.
Can I choose the sealant colour?
Yes. White, clear and grey are common, and other colours are available for many products, and we’ll agree it with you first.
Is it possible to take out silicone and use sand mastic instead?
Generally, yes. Once the silicone is out and the joint prepared, sand mastic is applied by hand.
Is sand mastic better than silicone for my windows?
That depends on your windows. On many period windows, sand mastic looks right and suits the building and newer frames generally get a flexible sealant.
Is it messy?
No. We protect the surfaces around the joints, and we tidy up before we go.
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.