Southampton · England
Sand mastic for sash & case windows in Chilworth, Southampton
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Chilworth, with a 12-month guarantee on every job. Call for a quick quote.
- Old sand mastic that has cracked, crumbled or fallen out
- A silicone bead on a sash window that spoils the look
- Patchy fillers round a sash window
Chilworth questions
Can you help a landlord with a rental near Swaythling station?
Yes. We work for landlords and agents as well as householders, 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’ll give you a clear price.
Can you do sand mastic in Chilworth?
Yes. We work across London and the South East, and Chilworth is part of that. Just call 0345 464 0079 or send us an email with a few details of the job.
Is it OK to seal over old sealant?
No, it won’t last. It can look neat for a few weeks, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Can you replace silicone on a period window with sand mastic?
Yes, it’s a common request. The old silicone has to come out completely so the mastic can sit properly.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Do you take out the old sealant first?
Yes, every time. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
Do you have insurance?
Yes. We’re fully insured.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Sand mastic for homes and businesses in Chilworth
Sand mastic doesn’t last for ever and gaps open up round the frame. We rake it out and renew it and tidies the surround. We’re often asked to deal with old sand mastic that has cracked, crumbled or fallen out and a silicone bead on a sash window that spoils the look, on timber door frames, stone surrounds and brick reveals.
Around Chilworth, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
Each job carries a 12-month guarantee, whatever its size.
- Where
- Chilworth (SO16)
- Wider area
- Southampton
- Cover
- One year on every job
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
When to call us in Chilworth
Water gets into small cracks in the mastic and loosens it further. Exposed elevations usually fail first.
Most people get in touch when they notice something like this:
- Silicone on a period window that looks wrong
- Patchy fillers round a sash window
- Cracked mastic round a front door frame
- Tired mastic found when preparing windows for paint
If you let a flat or house near Swaythling station, any sash windows need sound mastic to keep draughts and rain out.
Comparing quotes
- What the quote includes, VAT included or not
- The length of the guarantee
- How the joint is cleaned and prepared
- How long to leave it before use
Looking after it afterwards
After the cure time, these simple habits help:
- Plan mastic work ahead of painting
- Take care around the mastic when scraping paint
- Get any rot dealt with first
- Make sure water runs off the sill
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
What happens on the day
You do not need to clear the whole room or building, just the space around the work. Everything nearby is protected, and the job takes a few hours per window, depending on the condition of the joints in most cases. For a village or hamlet like Chilworth, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Preparing for the visit
- Mention any tricky access
- Move anything stored near the joints
- Let us know about parking restrictions
How to get a quote
For a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. You will have a clear quote before we start.
Related advice
What sealant work cannot fix
It helps to know what we can’t do too:
- Timber that has rotted
- Decisions on consent for listed homes
- Sashes that rattle, stick or will not open
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think.
Surfaces we seal
- Stone surrounds
- Period & listed homes
- Timber door frames
- Tenement windows
- Sash and case windows
- Brick reveals
What affects the cost of sand mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- The old material and how stubborn it is
- The amount of work
- Any working-time requirements on site
- Access and height
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
What we need to know
Before you ask for a quote, have a think about:
- If it’s domestic, commercial or a hotel
- Any access issues, like height or stairs
- The problem you’ve noticed
- Pictures of the joints, sent by email
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we will explain what’s involved and send you a clear quote.
Windows and doors in Chilworth
Historic houses like South Stoneham House (about 2 miles south-east) are a reminder that the area around Chilworth has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For an older house near a landmark such as Church of St Denys, the joint between an old wall and a newer frame is usually the first place rain gets in. For site and facilities teams at buildings such as Cantell School, larger buildings have plenty of frames, and the mastic around each one ages.
Chilworth is about 2 miles south-west of Chandler's Ford, in Southampton. Chilworth gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 40 places across Southampton, large and small.
We work across the SO16 postcode area for sand mastic and the streets around it. We cover properties on Heatherlands Road, Roman Road and Pinelands Road. Neighbouring places we cover for sand mastic include Chilworth Old Village (1 mile north-west), Bassett (1 mile south), Lordswood (1 mile south-west), Highfield (2 miles south) and North Baddesley (2 miles north-west). Further out, we also cover Southampton (3 miles south), Shirley (3 miles south), Regents Park (3 miles south-west), Townhill Park (3 miles south-east), Midanbury (3 miles south-east) and Thornhill (4 miles south-east).
Around Chilworth
Typical jobs here are in homes near Saint George Catholic Voluntary Aided College Southampton and Lakeside Country Park, among other places. The nearest railway station is Swaythling station, about 1.9 miles south-east of the centre. Well-known places in the area include Eastleigh Museum (2.5 miles east) and Marlands Shopping Centre (3.6 miles south). Green spaces nearby include Flexford Nature Reserve.
For landlords and businesses
We work for landlords and letting agents as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.