Hampshire · England
Sand mastic for sash & case windows in Locks Heath, Hampshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Locks Heath. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Window mastic to renew ahead of painting
- Mastic dropping out of the joint
- Mastic worn away on windows facing the weather
Why act early in Locks Heath
If you are redecorating, renew the mastic first. Painting over failed mastic does not seal it, and the new mastic is traditionally left unpainted. In a smaller place like Locks Heath, 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.
Doing several joints on one visit generally makes better use of the time than several visits. We will send you a clear quote for the lot.
What you get with us
- An ARBOMaster approved applicator
- 20+ years of sealant experience
- Neat joints and a tidy finish
- 4.9 on Google from 180+ five-star reviews
See how sealant jobs are priced and our reviews.
About our sand mastic in Locks Heath
Burnt sand mastic is a traditional material blends with stone and brick surrounds. It suits period and listed homes, where modern sealant can look out of place. We work on stone surrounds, sash and case windows and tenement windows, and common reasons people get in touch are weathered mastic on the most exposed windows and mastic that needs renewing before redecorating.
In smaller places like Locks Heath, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. The right sealant depends on the frame and on what it sits in.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we will put it right.
- Where
- Locks Heath (SO31, PO14, PO15)
- Wider area
- Hampshire
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Avoid patching sand mastic with silicone
- Keep sills and gutters clear so water drains away
- Avoid heavy scraping on the mastic joint
- Don’t paint over the new mastic
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
Landlord and commercial work in Locks Heath
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Towns and villages near Locks Heath
Other services in Locks Heath
What the job involves on each surface
Stone surrounds
Stone openings are rarely perfectly straight, so the gap isn’t the same all the way round. Sand mastic is shaped by hand to suit.
Timber door frames
Sand mastic is used round timber door frames too. The method is the same as for windows.
When to call us in Locks Heath
Timber swells and shrinks with the weather. The movement cracks the mastic little by little.
Common reasons people contact us include:
- Window mastic to renew ahead of painting
- Patchy fillers round a sash window
- Draughts and rain around sash boxes
- Cracked mastic round a front door frame
Rented homes near Swanwick station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Questions to ask before you book
- Which sealant they’ll use, and why
- How the surfaces are prepared before sealing
- How long to leave it before use
- What guarantee comes with the work
When something else is needed
To be straight with you, some problems need a different trade:
- Sashes that need overhauling
- Whether work needs listed building consent
- Decayed frames that need repair
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly before you book.
What we seal
- Period & listed homes
- Tenement windows
- Stone surrounds
- Brick reveals
- Sash and case windows
- Timber door frames
Sand mastic in Locks Heath: local notes
Locks Heath is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In the older streets around St John, frames set in older brick or stone need a sealant that suits the wall as well as the frame. For site and facilities teams at buildings such as Park Gate Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Locks Heath is about 3 miles west of Fareham, in Hampshire. Every kind of property in Locks Heath can book us for sand mastic. Every job comes with our 12-month guarantee. Our Hampshire coverage runs to 683 places, Locks Heath among them. You can also see our page for Southampton, roughly 7 miles from Locks Heath.
We work across SO31, PO14 and PO15 for sand mastic. Whether your property is on Church Road, Lower Church Road and Laxton Close or anywhere close by, we can help. Other places close to Locks Heath include Titchfield Common (1 mile south-east), Park Gate (1 mile north), Warsash (1 mile south-west), Sarisbury (1 mile north-west) and Segensworth (1 mile north-east). Larger places within reach include Winchester (14 miles north), Gosport (6 miles south-east), Havant (12 miles east), Eastleigh (8 miles north-west), Fareham (3 miles east) and Horndean (12 miles east).
Landmarks near Locks Heath
In Locks Heath, that means homes and buildings near Brookfield Community School and Language College and Jolly Farmer Public House, among other places. The nearest railway station is Swanwick station, roughly 0.9 miles north. Nearby you will also find St Andrew's Castle (2.2 miles west) and Carron Row Farm Museum (1.6 miles east). Not far away are Holly Hill Woodland Park.
What we do, step by step
When we get to you, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours per window, depending on the condition of the joints. In a smaller place like Locks Heath, 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.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Before we arrive
- Clear items away from the joints we’re working on
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know about parking restrictions
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
Questions from Locks Heath
Will you come out to Locks Heath?
Yes. Locks Heath is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
I let a flat near Swanwick station. Can you help?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
How long does sand mastic take to go off?
Not right away. It skins first and hardens fully later and we’ll give you an idea for your job.
Can I choose the sealant colour?
Yes. Sealants come in white, clear, grey and other colours for many products, and we’ll agree it with you first.
Can I paint the new mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
Is sand mastic better than silicone for my windows?
For period timber windows in stone or brick, sand mastic is often the better fit. On modern frames, we’d normally use a flexible sealant.
What’s sand mastic made of?
A traditional pointing material made from sand and a linseed-oil-based binder for the joint between timber frames and masonry.
Where are you based?
Mr Mastic is based in Crawley. We cover Locks Heath and the rest of Hampshire.