Hampshire · England
Sand mastic for sash & case windows in Upper Swanmore, Hampshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Upper Swanmore, with a 12-month guarantee on every job. Ask us for a quote.
- Gaps where the frame meets the masonry
- Cement or filler used on old window joints that has cracked
- Silicone on a period window that looks wrong
About our sand mastic in Upper Swanmore
Sand mastic skins over fairly quickly but full hardening takes longer. Traditional guidance is not to paint over it, so ask us before you decorate. We work on timber door frames, sash and case windows and period & listed homes, and people most often call us about tired mastic found when preparing windows for paint and patchy fillers round a sash window.
Homes in small places like Upper Swanmore often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Location
- Upper Swanmore (SO32)
- Region
- Hampshire
- Cover
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Landlord and commercial work in Upper Swanmore
We also work for property managers and facilities teams in Upper Swanmore and across Hampshire. We can quote a run of properties together.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
DIY sealant or a professional job?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly.
Upper Swanmore: your questions answered
Do you work for landlords with property near Botley station?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can be quoted together. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
Do you cover smaller places like Upper Swanmore?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Will there be a smell?
Sometimes, a little. Any smell clears as the sealant cures.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover Upper Swanmore.
Will it make a mess?
Tidy work is part of the job. We protect what’s around the joints, and the area is left clean when we finish.
Can you match the sealant colour?
Generally, yes. Sealants come in white, clear, grey and other colours, and we’ll agree it with you first.
Do you remove the old sealant?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Are you insured?
Yes. We are fully insured for every job we do.
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Ask us before painting near the mastic
- Have rotten timber repaired before new mastic goes in
- Find out about consent before window work on a listed home
- Sort the mastic before the decorators arrive
Leave the new mastic alone while it firms up. It forms a skin fairly soon, but takes longer to harden fully.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger.
How we quote for sand mastic
For a quick quote, just ask. The main things that affect it are:
- When we can work, for business premises
- The number of rooms or windows
- Any mould that needs treating
- How much old sealant there is and how hard it is to remove
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
Helping us quote
When you contact us, these details help:
- If someone has resealed it before
- The rough size of the job
- Pictures of the joints, sent by email
- How we’d reach the joints
We don’t publish a price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or email us.
Common problems we fix in Upper Swanmore
Previous repairs in cement or silicone often trap water or crack away. They don’t move with the timber and we normally remove them.
If you can see any of these, it’s time to have the joints looked at:
- Draughty sash windows at the surround
- Patchy fillers round a sash window
- Window mastic to renew ahead of painting
- Gaps between timber frames and stone or brick
For site and facilities teams at buildings such as Swanmore Church of England Aided Primary School, its window and door frames need their mastic kept sound, just like a home’s.
What your quote should include
- Who turns up on the day
- Whether you can choose the colour
- What the quote includes, VAT included or not
- How long the guarantee is
Why deal with it now?
Not every filler suits an old window surround. Sand mastic is the like-for-like choice, which can matter on listed and conservation-area homes. Around Upper Swanmore, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, ring 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Why choose Mr Mastic in Upper Swanmore
- ARBOMaster approved applicator
- 12-month guarantee on every job
- Fully insured
- Domestic, commercial and hotel work
See how sealant jobs are priced and our reviews.
Sand mastic in Upper Swanmore: local notes
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Letting a property close to Botley station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. Homes close to Church of St Barnabas include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Upper Swanmore is about 6 miles north-east of Hedge End, in Hampshire. We carry out sand mastic for homes and businesses in Upper Swanmore and nearby. Our Hampshire coverage runs to 683 places, and Upper Swanmore is one of them. There’s also a page for Southampton, roughly 10 miles from Upper Swanmore.
We work across SO32 for sand mastic. Whether your property is on Vicarage Lane, Green Lane and Well Lane or a nearby road, our applicators can take on the job. Neighbouring places we cover for sand mastic include Hill Grove (1 mile south), Swanmore (1 mile south-west), The Hangers (1 mile north-west), Droxford (2 miles north-east) and Dean (2 miles north-west). Within a short drive, we also cover Winchester (10 miles north-west), Gosport (10 miles south), Havant (10 miles south-east), Eastleigh (8 miles west), Fareham (7 miles south) and Horndean (8 miles south-east).
What’s near Upper Swanmore
Locally, jobs take us to homes and businesses close to Swanmore College of Technology and the streets around them. Upper Swanmore’s nearest station is Botley station, roughly 4.4 miles south-west of the centre. A little further out are Bishop's Waltham Museum (1.9 miles west) and Knowle Hospital (5.1 miles south). The countryside around Upper Swanmore includes St Clair's Meadow and Beacon Hill.
Also near Upper Swanmore
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What we do, step by step
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes anything from a few hours to a full day, depending on how many windows and we leave things clean and tidy. Somewhere as small as Upper Swanmore, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Mention any tricky access
- Plan for the work area to be out of bounds to pets and children
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
To get a quote, phone 0345 464 0079 or send us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.