Hampshire · England
Sand mastic for sash & case windows in Longstock, Hampshire
Sand mastic for Longstock and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Mastic dropping out of the joint
- Mastic worn away on windows facing the weather
- Gaps between timber frames and stone or brick
Sand mastic in Longstock
Across Longstock, we renew sand mastic around sash and case windows. Every joint is cleaned out and filled by hand for a neat, traditional finish. If you are dealing with window mastic to renew ahead of painting and gaps where the frame meets the masonry, we can help, whatever the surface.
Around Longstock, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Place
- Longstock (SO20)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Honest limits
In fairness, there are a few things sealant won’t fix:
- Damaged stone surrounds
- Decayed frames that need repair
- Putty and glazing repairs
If you’re not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer before booking.
Where we work in Longstock
- Period & listed homes
- Timber door frames
- Tenement windows
- Stone surrounds
- Brick reveals
- Sash and case windows
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
We work for landlords and letting agents as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
What we do, step by step
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The work itself takes a few hours per window, depending on the condition of the joints, including the tidy-up. Somewhere as small as Longstock, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Mention if the joints have been sealed before
- Where the joints are inside, avoid wetting them before we arrive
Getting a quote
We don’t publish a price list, because every job is different. Instead, we give you a clear quote for your job. To get started, call 0345 464 0079 or send us an email.
Related advice
Places near Longstock
More services for Longstock
Longstock homes and the weather
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you look after a building such as Test Valley School, larger buildings have plenty of frames, and the mastic around each one ages.
Longstock is about 5 miles south of Andover, in Hampshire. Jobs in Longstock get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Across Hampshire, we cover 683 places, and Longstock is one of them. For nearby work, see our Southampton page, about 15 miles away.
We work across the SO20 postcode area for sand mastic. We also cover Leckford (1 mile east), Stockbridge (1 mile south), Fullerton (2 miles north-east), Cottonworth (2 miles north-east) and Chilbolton (3 miles north-east). Further out, we also cover Winchester (9 miles south-east), Eastleigh (13 miles south-east), Andover (5 miles north), Totton (15 miles south), Chandler's Ford (11 miles south-east) and Romsey (10 miles south).
Landmarks near Longstock
Around Longstock, our work takes us to homes and buildings near Longstock Park and The Peat Spade Public House and the streets around them. Well-known places in the area include Andover War Memorial Hospital (5.8 miles north). For a walk, there’s Mill Lake.
How to look after the new joints
Simple care keeps the joints in good condition. We recommend:
- Avoid patching sand mastic with silicone
- Take care around the mastic when scraping paint
- Leave the new mastic unpainted
- Find out about consent before window work on a listed home
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
FAQs for Longstock
Is Longstock in your area for sand mastic?
Yes. Our work covers London and the South East, and Longstock is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we’ll send you a clear quote.
Is Longstock within the area you cover?
Yes. Longstock is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Where is Mr Mastic based?
We are based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Do you guarantee sand mastic work?
There’s a 12-month guarantee on every job.
Are you insured?
Yes. We are fully insured.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and you will get one quote.
Is it possible to take out silicone and use sand mastic instead?
In most cases. We remove the silicone and clean the joint before the sand mastic goes in.
Do you do commercial work?
Yes. We’ve worked for hotels, offices and other businesses, and we are fully insured.
How the job changes by surface
Stone surrounds
We take care not to mark the stone while raking out the old mastic.
Period and listed homes
A traditional finish suits a period property.
DIY sealant or a professional job?
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
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.
When to call us in Longstock
Scraping and sanding before painting can loosen old mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
Keep an eye out for these signs:
- Wind and rain getting in round a sash window
- A silicone bead on a sash window that spoils the look
- Window mastic to renew ahead of painting
- Patchy fillers round a sash window
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.
What to look for in a quote
- How hidden problems are handled
- What the quote includes, VAT included or not
- Whether you can choose the colour
- How long the guarantee is