Hampshire · England
Sand Mastic in St Cross
Specialist sand mastic for St Cross: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Mastic dropping out of the joint
- Old cement repairs round a window that have failed
- Wind and rain getting in round a sash window
What happens on the day
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes a few hours for a single window, longer for several, and the area is left clean. A visit to St Cross is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We check the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- We dress the surface so it sits neatly against the masonry.
How to prepare
- Mention any tricky access
- Mention any leaks or damp you’ve noticed
- Clear items away from the joints we’re working on
How to get a quote
For a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Related advice
How we handle sand mastic in St Cross
If your home is listed or in a conservation area, check with your local planning authority if consent is needed before window work. Like-for-like sand mastic is often the preferred finish. We work on period & listed homes, sash and case windows and brick reveals, and the jobs we see most are cracked mastic round a front door frame and crumbling sand mastic round a window.
In smaller places like St Cross, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. Each frame material needs the right sealant against the right wall.
A 12-month guarantee comes as standard.
- Where
- St Cross (SO22, SO23)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
For landlords and businesses
Housing providers, facilities teams and property managers book us too in St Cross and across Hampshire. Several sites can go on one quote, and we’re fully insured.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
Common problems we fix in St Cross
Timber frames move with the seasons. That movement opens up the mastic joint little by little.
Common reasons people contact us are:
- Window mastic to renew ahead of painting
- Patchy fillers round a sash window
- Draughty sash windows at the surround
- Weathered mastic on the most exposed windows
If you live in an older home near St. Cross Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before you book
- Which sealant they’ll use, and why
- How the colour is chosen
- How long the guarantee is
- How much experience the applicator has
DIY versus a professional finish
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Towns and villages near St Cross
Also in St Cross
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Take care around the mastic when scraping paint
- Leave the new mastic unpainted
- Ask a joiner to look at soft timber first
- Do not run silicone over sand mastic
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
Frames and glazing around St Cross
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 Winchester station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. Schools such as St Faith's Church of England Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
St Cross is about 1 mile south of Winchester, in Hampshire. From the centre of St Cross to the outskirts, we cover sand mastic for every kind of property. St Cross is one of 683 towns and villages in Hampshire we cover. You can also see our page for Southampton, roughly 10 miles from St Cross.
All of SO22 and SO23 is covered for sand mastic. Streets in the area include Edgar Road, Hubert Road and Grange Road, all of which we cover. If you are just outside St Cross, we cover Badger Farm (1 mile west), Stanmore (1 mile north-west), Winchester (1 mile north), Bar End (1 mile east) and Highcliffe (1 mile north-east). Larger places within reach include Eastleigh (6 miles south), Fareham (15 miles south), Andover (13 miles north-west), Totton (12 miles south-west), Chandler's Ford (5 miles south-west) and Hedge End (9 miles south).
Near you in St Cross
We work in homes and buildings around St. Cross Park, The Bell Inn Public House and Kings' School. The nearest railway station is Winchester station, roughly 1.3 miles north. A little further out are The Gurkha Museum (0.6 miles north-east) and Royal Hampshire County Hospital (0.9 miles north). Open spaces near St Cross include Hockley Meadows and Twyford Down.
Questions from St Cross
Is St Cross within the area you cover?
Yes, St Cross is covered. 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.
I let a flat near Winchester station. Can you help?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear price.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
What does sand mastic cost?
We don’t publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before work begins.
What do you need from me for a quote?
The location, the problem and the rough size of the job. If you can, email a few pictures.
How long does sand mastic take?
As a guide, most jobs take a few hours for a single window, longer for several. Bigger jobs take longer, and we’ll say how long yours will take.
Can you do several jobs on one visit?
Yes, we can. More than one area can go on one quote.
What’s sand mastic made of?
Sand mastic is a traditional material for pointing round windows and doors. It’s made with sand and a linseed-oil-based binder.
What affects the quote in St Cross
There’s no set price list, because no two jobs are the same. The quote depends on:
- Whether old sealant or filler has to be cut out
- The product the joint needs
- Working hours on commercial sites
- How easy the joints are to reach
Combining jobs into one visit normally makes better use of the time than several visits. You will get one clear quote for the whole job.
Helping us quote
When you call or email, it’s useful to know:
- How many joints, rooms or windows are involved
- Whether it’s a home or a business
- The address or postcode of the job
- Any previous sealing or DIY work
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Different surfaces, different methods
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. Sand mastic is shaped by hand to suit.
Period and listed homes
Many older homes were built with sand mastic round the windows. On listed buildings, check with your planning authority first.