Hampshire · England
Window Mastic in South Down
Mastic around window and door frames, sills and patio doors for homes and businesses in South Down and across Hampshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Mastic that has split away from the wall
- Gaps between the frame and the inside reveal
- Whistling draughts around closed windows
Window mastic for homes and businesses in South Down
The new joint does not have to be white. We can seal in white, brown, anthracite grey, black or clear, so the bead blends with the window rather than framing it. We work on window sills, timber windows & doors and patio & French doors, and common reasons people get in touch are whistling draughts around closed windows and mastic that has split away from the wall.
Outdoor sealant needs dry, clean surfaces, so work on frames around South Down is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Every job comes with a 12-month guarantee.
- Where
- South Down (SO21)
- Region
- Hampshire
- Cover
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Questions from South Down
Is South Down within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you cover South Down for window mastic?
Yes, South Down is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or send us an email and let us know what needs doing, and we’ll give you a clear price.
Can resealing stop a draught around my window?
Yes, if the air is getting in around the frame. If it’s through the window’s own seals or a hinge, that’s a different fix, and we’ll say so.
Which products do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we will tell you what we are using.
Do you work for letting agents?
Yes, we do. Domestic, commercial and hotel work are all part of what we do, and we are fully insured.
Can new window sealant be painted?
Not normally, if it’s silicone. Tell us your decorating plans and we’ll pick a sealant to suit.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Will there be a smell?
Possibly a little. It fades as the sealant cures.
Do you need window mastic in South Down?
A lot of older mastic was never designed to stay flexible. Once it has hardened, the frame’s movement tears it from the wall, leaving a hairline gap down one side.
Most people get in touch when they notice one of these:
- Rushed sealant from a window installation
- Mastic that has split away from the wall
- Gaps where the sill meets the wall
- Cracked internal joints between frame and plaster
If you live in an older home near Church of All Saints, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Questions to ask before you book
- How the joint is cleaned and prepared
- What the quote includes, VAT included or not
- What happens if the job turns out different
- How much experience the applicator has
Window mastic in South Down: local notes
London and the South East are among the drier parts 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 Shawford station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. If you look after a building such as Twyford St Mary's Church of England Primary School, the mastic around its windows and doors needs looking after like any other building’s.
South Down is about 3 miles north-east of Chandler's Ford, in Hampshire. We carry out window mastic for homeowners, landlords and businesses in South Down, as part of our work across Hampshire. Our Hampshire coverage runs to 683 places, and South Down is one of them. We also work in Southampton, around 7 miles away.
Our applicators cover all of SO21 for window mastic. Window mastic is available to properties on Cross Way, Fairfield Road and Grove Road. We also cover the places around South Down: Compton (1 mile north), Otterbourne (1 mile south-west), Shawford (1 mile north-east), Twyford (1 mile east) and Oliver's Battery (2 miles north). Further out, we also cover Winchester (3 miles north), Eastleigh (3 miles south), Fareham (13 miles south-east), Andover (15 miles north-west), Totton (10 miles south-west) and Chandler's Ford (3 miles south-west).
Landmarks near South Down
In South Down, that means homes and buildings near The Bridge Inn and Thornden School and the streets around them. The closest station to South Down is Shawford station, roughly 0.6 miles north-east of the centre. Nearby you will also find Balfour Museum of Hampshire Red Cross History (2.9 miles north) and Wolvesey Castle (3.2 miles north). Not far away are Twyford Down and Shawford Down.
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we’re fully insured.
Also near South Down
Other services in South Down
Different surfaces, different methods
Patio & French doors
The joints around patio doors run a long way, top, sides and threshold. Most leaks start at the bottom corners, so we pay close attention there.
Window sills
Stone and concrete sills have their own joints, including the one between the sill and the frame above. We seal those with a sealant suited to masonry.
Honest limits
To be straight with you, there are a few things sealant will not fix:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- A sash or casement that will not close properly
- Draughts through the window seals rather than the frame
If you’re not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Surfaces we seal
- Patio & French doors
- Composite doors
- Aluminium frames
- Window sills
- Timber windows & doors
- uPVC windows
Aftercare tips
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Clear any debris from frame drain holes
- Look round the frames every year or so
- Avoid harsh chemicals near the mastic
- Wipe condensation off the frames
Timber frames need their paint kept up, since wood that gets wet swells and shrinks more. Paint up to the joint, not over the silicone.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so it pays to reseal before that happens.
What happens if it’s left?
The work is quick compared with the damage it prevents: the visit takes a morning for a couple of windows and a door. Leave it until water is coming in and you may need plastering and decorating as well. Where a wall is exposed, as many are in small places like South Down, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
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’ll know the price before we begin.
What you get with us
- Any old sealant cut out fully, not covered over
- Sealant colour chosen to suit
- Every job guaranteed for a year
- You choose the colour before work begins
Read what affects the cost and our reviews.
What we do, step by step
We bring everything the job needs with us. Once we’ve agreed what’s being done, the area is protected and the work begins. Most jobs take a morning for a couple of windows and a door. Somewhere as small as South Down, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check each frame and agree which ones need doing.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Preparing for the visit
- Move anything stored near the joints
- Try not to wet indoor joints just before the visit
- For business premises, tell us about site rules or sign-in
Get a quote
For window mastic in South Down, call 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you’ll get a clear quote before any work starts.