Portsmouth · England
Sand mastic for sash & case windows in Kingston, Portsmouth
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Kingston. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Crumbling sand mastic round a window
- Wind and rain getting in round a sash window
- Modern sealant on a period surround
Sand mastic in Kingston, done properly
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. The old mastic is raked out, and new mastic is applied and shaped by hand. We work on stone surrounds, sash and case windows and tenement windows, and the jobs we see most are window mastic to renew ahead of painting and open joints round the window box.
In a smaller place like Kingston, some walls face open ground and catch the full force of the weather, so exposed windows and doors face the weather head on. The mastic around frames on those walls tends to age faster.
All of our work is guaranteed for twelve months, in Kingston and everywhere else we cover.
- Place
- Kingston (PO1, PO3, PO4)
- Region
- Portsmouth
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How the job changes by surface
Timber door frames
Round a period front door, sand mastic gives the right look.
Stone surrounds
Stone surrounds suit sand mastic well. The finish blends with the masonry.
Also in Kingston
DIY sealant or a professional job?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Windows and doors in Kingston
Kingston is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. 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.
Schools such as Miltoncross Academy are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. Homes close to Church of St Cuthbert include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Letting a property close to Fratton station? Then any sash windows need sound mastic to keep draughts and rain out.
Kingston is about 1 mile south-east of Portsmouth, in Portsmouth. Every kind of property in Kingston can book us for sand mastic. Every job comes with our one-year guarantee. Kingston is one of 19 towns and villages in Portsmouth we cover for sand mastic.
Jobs for sand mastic in PO1, PO3 and PO4 works the same way as everywhere else we cover. Local streets include Renny Road, Clive Road and Union Road. Main roads around Kingston include the A288, which makes travel easy. Neighbouring places we cover for sand mastic include Fratton (1 mile south-west), Baffins (1 mile north-east), Copnor (1 mile north), Portsmouth (1 mile north-west) and Landport (1 mile west). Larger places within reach include Wymering (3 miles north), Paulsgrove (3 miles north), Cosham (3 miles north), Drayton (3 miles north) and Farlington (3 miles north-east).
Near you in Kingston
Around Kingston, our work takes us to homes and buildings near Langstone Infant School, Graham Arms and Alexandra Park, among other places. For rail, the closest station is Fratton station, roughly 0.5 miles south-west. Nearby you’ll also find Charles Dickens Birthplace Museum (1 mile west) and St Mary's Hospital (within half a mile south-east). Not far away are Milton Locks and Portsdown Hill.
When it isn’t the sealant
In fairness, some problems need a different trade:
- Decayed frames that need repair
- Decisions on consent for listed homes
- Damaged stone surrounds
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think before you book.
Where we work in Kingston
- Stone surrounds
- Brick reveals
- Tenement windows
- Timber door frames
- Period & listed homes
- Sash and case windows
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Check with your local planning authority if your home is listed
- Make sure water runs off the sill
- Avoid heavy scraping on the mastic joint
- Look over the window mastic once a year
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look rather than patching it.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.
How the visit works
Every visit runs the same way: we check the joints, protect the area around them, carry out the job and tidy away. Most jobs take anything from a few hours to a full day, depending on how many windows. A visit to Kingston is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
How to prepare
- On commercial sites, let us know about site rules
- Plan for the work area to be out of bounds to pets and children
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or drop us an email.
Advice
What happens if it’s left?
Silicone might seem the quicker option, but on period stone or brick it often looks out of place. Sand mastic is the traditional material and finishes neatly against the masonry. Around Kingston, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
What it costs depends on the amount of work, how hard the old material is to remove and access to the work. We give a clear quote before we start.
Why us?
- 12-month guarantee on every job
- An ARBOMaster approved applicator
- We’re fully insured
- Homes, businesses and hotels
Read our cost guide and our reviews.
What affects the cost of sand mastic
There’s no set price list. The quote depends on:
- The size of the job
- How much old sealant there is and how hard it is to remove
- When we can work, for business premises
- The number of rooms or windows
What you pay reflects the work, not guesswork. That’s why we ask a few questions first and give you a clear quote before work begins.
What to tell us for a quote
You do not need to know the technical terms. Just tell us:
- What’s wrong with the joints now
- Access, such as stairs, a lift or height
- Where the property is
- Roughly how big the job is
For a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We’ll send you a clear quote before any work starts.
Common questions in Kingston
Is Kingston within the area you cover?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Is sand mastic in a coastal place like Kingston any different?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
Which is right for my windows, sand mastic or modern sealant?
It depends on the window. Period windows in stone or brick normally suit sand mastic and newer frames usually get a flexible sealant.
When will the new mastic be hard?
It forms a skin fairly soon, then hardens over a longer period. Timing depends on the weather and the joint.
Can new sealant go over the old?
No. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
What is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
What do you put in the joint?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
Can tenants book the work?
Yes. Ask your landlord first, and we can send them the quote if that helps.