Southampton · England
Hounsdown Sand Mastic
Sand mastic for Hounsdown, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Cracked mastic round a front door frame
- Old sand mastic that has cracked, crumbled or fallen out
- Draughty sash windows at the surround
Sand mastic for homes and businesses in Hounsdown
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s made from sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. Typical jobs include weathered mastic on the most exposed windows and patchy fillers round a sash window, across stone surrounds, tenement windows and period & listed homes.
Many houses in smaller places like Hounsdown have conservatories, garden rooms or patio doors. Their glazing joints and frame seals are as much a part of the job as the windows, and any older timber or sash windows need a sealant that suits them.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Place
- Hounsdown (SO40)
- Wider area
- Southampton
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
For landlords and businesses
If you manage several properties in or around Hounsdown, several properties can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Hounsdown homes and the weather
Hounsdown is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you live in an older home near Colbury Christ Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. For landlords with property near Totton station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Hounsdown is about 1 mile south of Totton, in Southampton. We provide sand mastic to homes and businesses in Hounsdown and nearby, as part of our work across Southampton. Our Southampton coverage runs to 40 places, Hounsdown among them.
Every address in SO40 is within our area for sand mastic. Streets in the area include Main Road, Pound Lane and Chapel Lane, and we cover them all. We also cover Ashurst Bridge (1 mile north-west), Totton (1 mile north), Netley Marsh (1 mile north-west), Woodlands (2 miles west) and Winsor (3 miles north-west). We also work in nearby towns such as Southampton (5 miles east), Shirley (3 miles east), Regents Park (3 miles east), Townhill Park (6 miles east), Midanbury (6 miles east) and Thornhill (7 miles east).
Around Hounsdown
Typical jobs here are in homes near Foxhills Infant School and The Forest Inn. The closest station to Hounsdown is Totton station, roughly 1.1 miles north-east of the centre. Well-known places in the area include National Dairy Museum (0.8 miles south) and Ashurst Hospital (1.4 miles south-west). Green spaces nearby include Testwood Lakes.
What we can’t put right
A few problems are outside what sealant work can do:
- Cracked or broken glass
- Planning or listed building consent (your local planning authority decides)
- Damaged stone surrounds
If in doubt, ring 0345 464 0079 or send us an email and we will say what we think before you book.
Joints and surfaces we work on
- Sash and case windows
- Tenement windows
- Stone surrounds
- Brick reveals
- Period & listed homes
- Timber door frames
Quotes for sand mastic in Hounsdown
We quote each job individually. This is what makes a difference:
- The size of the job
- Whether old sealant or filler has to be cut out
- Any working-time requirements on site
- Whether there’s mould to deal with
The cost depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before work begins.
Asking for a quote
There’s no need for technical detail. Just tell us:
- How we’d reach the joints
- If someone has resealed it before
- How many joints, rooms or windows are involved
- Where the job is, and your postcode
For sand mastic in Hounsdown, call 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before any work starts.
How it works
On the day, we start by going over the job with you, so there are no surprises. Surfaces next to the work are protected before any work begins. Most jobs take anything from a few hours to a full day, depending on how many windows. In a smaller place like Hounsdown, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Keep children and pets away from the work area
- Let us know about earlier repairs to the joints
Ask for a quote
Getting a quote is simple: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job.
Advice
What happens if it’s left?
Not every filler suits an old window surround. Sand mastic matches what was there and that can be important for listed homes. In a smaller place like Hounsdown, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Why choose Mr Mastic in Hounsdown
- We leave the area clean and tidy
- Homes, businesses and hotels
- Anti-fungal silicone where joints get wet
- Old sealant always removed completely
Take a look at how sealant jobs are priced and our reviews.
Hounsdown questions
Does the coastal weather in Hounsdown affect outside sealant?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Do you cover smaller places like Hounsdown?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do I need to be at home?
That depends on where the joints are. For work indoors, someone needs to let us in.
Can new sealant go over the old?
No, it will not last. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
Are you fully insured?
Yes. We are fully insured, with over 20 years’ experience in sealant work.
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.
Can you quote for more than one area?
Yes. Just list everything you need and you’ll get one quote.
Will you leave a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Surface by surface
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We work on single windows or whole elevations.
Do you need sand mastic in Hounsdown?
Rain on the window surround works into any crack and pushes it out. Exposed elevations usually fail first.
Common reasons people contact us are:
- Crumbling sand mastic round a window
- A silicone bead on a sash window that spoils the look
- Cement or filler used on old window joints that has cracked
- Open joints round the window box
For site and facilities teams at buildings such as Hounsdown School, larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before you book
- How the surfaces are prepared before sealing
- What happens if they find a problem under the old sealant
- How the colour is chosen
- What guarantee comes with the work