Southampton · England
Sand mastic for sash & case windows in Inner Avenue, Southampton
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Inner Avenue, with a one-year guarantee on every job. Ask us for a quote.
- Crumbling sand mastic round a window
- A silicone bead on a sash window that spoils the look
- Wind and rain getting in round a sash window
About our sand mastic in Inner Avenue
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditional guidance is not to paint over it and we’ll advise if you’re redecorating. Typical jobs include wind and rain getting in round a sash window and cracked mastic round a front door frame, on sash and case windows, stone surrounds and timber door frames.
Around Inner Avenue, conservatories, garden rooms and patio doors are often part of the house. 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.
Whatever the size of the job, it’s backed by our one-year guarantee in Inner Avenue and across Southampton.
- Location
- Inner Avenue (SO14, SO15, SO17)
- Region
- Southampton
- Guarantee
- 12 months on all our work
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Frames and glazing around Inner Avenue
Inner Avenue is within about 2 miles of 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. Historic houses like Southampton Tudor House and Garden (about 1.2 miles south) are a reminder that the area around Inner Avenue 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.
Homes close to Saint Mary's include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. For landlords with property near St Denys station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Inner Avenue is about 1 mile west of Southampton, in Southampton. Every kind of property in Inner Avenue can book us for sand mastic. Every job comes with our one-year guarantee. Inner Avenue is one of 40 towns and villages in Southampton we cover.
All of SO14, SO15 and SO17 is covered for sand mastic, from the main roads to the quietest streets. That includes homes and businesses on Alma Road, Rose Road and Lawn Road and the roads around them. Nearby, we also carry out sand mastic in Southampton (1 mile east), Portswood (1 mile north-east), St Denys (1 mile north-east), Bitterne Manor (1 mile east) and St Mary's (1 mile south). Larger places within reach include Thornhill (3 miles east), Eling (4 miles west), Rownhams (3 miles north-west), Weston (3 miles south-east), Hounsdown (4 miles west) and Nursling (3 miles north-west).
Local landmarks in Inner Avenue
Around Inner Avenue, our work takes us to homes and buildings near St Anne's Catholic School, St Mary's Independent School and Rockstone Place Park and the streets around them. Inner Avenue’s nearest station is St Denys station, about 0.6 miles north-east of the centre. Nearby you’ll also find Royal South Hants Hospital (under half a mile south-east) and Marlands Shopping Centre (0.8 miles south). The countryside around Inner Avenue includes Netley Common.
How we quote for sand mastic
We quote each job individually. This is what makes a difference:
- Mould in or behind the old joints
- How many rooms, windows or areas are involved
- The type of sealant required
- The amount of work
What you pay reflects the work, not guesswork. That’s why we ask about the job first.
Helping us quote
What to tell us when you ask for a quote:
- Any previous sealing or DIY work
- Where the property is
- Access, such as stairs, a lift or height
- The rough size of the job
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we will talk you through the work.
What the job involves on each surface
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We can do one window or several.
Landlords, agents and businesses in Inner Avenue
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. Several properties can go on one quote.
We regularly work with letting and managing agents. Tell us the address, the job and how access works.
Also near Inner Avenue
More services for Inner Avenue
Inner Avenue questions
Does living near the coast affect sand mastic in Inner Avenue?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
Is Inner Avenue within the area you cover?
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.
What do you need from me for a quote?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply ring 0345 464 0079 or email us.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
Do you work for landlords and businesses?
Yes, often. Several properties can be quoted together, and between tenancies is a good time for the work.
Are you insured?
Yes, we’re fully insured.
Is consent needed for window work on a listed home?
It’s best to ask your local planning authority first. Like-for-like sand mastic is often the preferred finish but the decision is theirs.
Common problems we fix in Inner Avenue
Rain on the window surround works into any crack and pushes it out. Windows facing the weather tend to go first.
If you can see any of these, it’s time to have the joints looked at:
- Weathered mastic on the most exposed windows
- Crumbling sand mastic round a window
- Wind and rain getting in round a sash window
- Mastic that needs renewing before redecorating
For site and facilities teams at buildings such as Bevois Town Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Before you book anyone
- What the quote includes, VAT included or not
- Who turns up on the day
- When the joint can take water or movement
- How the colour is chosen
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Avoid heavy scraping on the mastic joint
- Ask us before painting near the mastic
- Keep sills and gutters clear so water drains away
- Avoid patching sand mastic with silicone
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.
How it works
A visit follows a simple pattern: we check the joints, protect the area around them, do the work and tidy away. It generally takes anything from a few hours to a full day, depending on how many windows. In a smaller place like Inner Avenue, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- Keep pets and children clear of the area while we work
- Mention any sign-in or site rules at work premises
- Let us know if you’ve seen damp or leaks
Ask for a quote
Need a quote? Please ring 0345 464 0079 or drop us an email and tell us about the job. We will explain what we’d do and give you a clear price before we start.
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Why act early in Inner Avenue
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. In a smaller place like Inner Avenue, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you’re 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 Inner Avenue customers choose us
- Fully insured
- Sanitary silicone with an anti-fungal additive in wet areas
- Approved under the ARBOMaster scheme
- Trusted Arbo and Everbuild sealants
Take a look at what affects the cost and our reviews.