Hampshire · England
Test Valley Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Test Valley, with a 12-month guarantee on every job. Ask us for a quote.
- Wind and rain getting in round a sash window
- Cement or filler used on old window joints that has cracked
- Mastic worn away on windows facing the weather
Sand mastic in Test Valley, done properly
For a listed home or one in a conservation area, ask your local planning authority whether consent is needed for work to windows. Like-for-like sand mastic is often the preferred finish. Typical jobs include window mastic to renew ahead of painting and mastic round period door frames that has failed, on tenement windows, sash and case windows and brick reveals.
Outdoor sealant needs dry, clean surfaces, so work on frames around Test Valley is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Every job is covered by a one-year guarantee, wherever you are in Hampshire.
- Where
- Test Valley (SP11)
- Wider area
- Hampshire
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach 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 chosen for how the joint moves and where it is, then guaranteed for a year.
Sand mastic in Test Valley: local notes
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Stargroves (about 2.7 miles north) nearby, there’s older building stock in the area around Test Valley as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
For an older house near a landmark such as Church of St James, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Around Test Valley, as everywhere, sand mastic is only as good as the preparation behind it.
Test Valley is about 7 miles north of Andover, in Hampshire. Whether you’re in the middle of Test Valley or further out, sand mastic is available for homes and businesses alike. Our Hampshire coverage runs to 683 places, and Test Valley is one of them. Our Reading page covers work nearby (22 miles or so).
Postcode districts we cover here for sand mastic: SP11. If you’re just outside Test Valley, we cover Ashmansworth (1 mile east), Vernham Street (3 miles west), Upper Green (4 miles north), Inkpen Common (5 miles north) and Hell Corner (5 miles north). Further out, we also cover Basingstoke (15 miles east), Andover (7 miles south), Tadley (13 miles east), Popley (15 miles east), Tidworth (11 miles south-west) and Kempshott (13 miles east).
Local landmarks in Test Valley
Open spaces near Test Valley include Pilot Hill.
Landlord and commercial work in Test Valley
Housing providers, facilities teams and property managers book us too in Test Valley and across Hampshire. We can quote a run of properties together.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Also near Test Valley
What else we do in Test Valley
The process
You don’t need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the work takes a few hours for a single window, longer for several for a typical job. Somewhere like Test Valley needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
How to prepare
- Keep pets and children clear of the area while we work
- Mention any leaks or damp you’ve noticed
- For business premises, tell us about site rules or sign-in
How to get a quote
For sand mastic in Test Valley, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Related advice
Questions from Test Valley
Can you do sand mastic in Test Valley?
Yes, Test Valley is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
Is sand mastic in Test Valley guaranteed?
Every job comes with our one-year guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
What do you put in the joint?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
Is consent needed for window work on a listed home?
Yes, it’s worth checking. Your local planning authority can say if consent is needed for work on a listed home or in a conservation area.
Is it messy?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Is it possible to paint over sand mastic?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we’ll advise.
I rent my home. Can I book you?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
Is it possible to take out silicone and use sand mastic instead?
Often, yes. Once the silicone is out and the joint prepared, sand mastic is applied by hand.
Surface by surface
Stone surrounds
The stone is treated with care while raking out the old mastic.
Timber door frames
Period doors in stone or brick openings are often pointed with sand mastic. The method is the same as for windows.
Why act early in Test Valley
Replacing sash windows is a big decision for a period home, and in listed buildings it may need consent. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Where a wall is exposed, as many are in small places like Test Valley, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why choose Mr Mastic in Test Valley
- Any old sealant cut out fully, not covered over
- Fully insured
- A 12-month guarantee on all work
- Trusted Arbo and Everbuild sealants
Read our cost guide and our reviews.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Have rotten timber repaired before new mastic goes in
- Make sure water runs off the sill
- Take care around the mastic when scraping paint
- Ask the planning authority about consent for listed or conservation-area homes
Leave the new mastic alone while it firms up. It forms a skin fairly soon but needs longer to fully harden.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.
How we quote for sand mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Whether there’s mould to deal with
- Access and height
- When we can work, for business premises
- The old material and how stubborn it is
Combining jobs into one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. We’ll give you a clear price for the lot.
Helping us quote
There’s no need for technical detail. Just tell us:
- The problem you’ve noticed
- Any previous sealing or DIY work
- If it’s domestic, commercial or a hotel
- Where the property is
We do not publish a price list. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or send us an email.