Hampshire · England
Sand mastic for sash & case windows in Martin, Hampshire
Sand mastic across Martin and nearby, with old sealant always removed completely and a 12-month guarantee.
- Modern sealant on a period surround
- Gaps where the frame meets the masonry
- Draughts and rain around sash boxes
Sand mastic in Martin, done properly
Burnt sand mastic is a traditional material that sits naturally against stone and brick. It’s a good fit for period properties where a modern sealant bead would stand out. If you have gaps round a timber door in stone or brick and gaps where the frame meets the masonry, we can help, whatever the surface.
Outdoor sealant needs dry, clean surfaces, so work on frames around Martin is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
Each job carries a 12-month guarantee, whatever its size.
- Place
- Martin (SP6)
- Region
- Hampshire
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How the visit works
When we arrive, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before any work begins. Most jobs take a few hours for a single window, longer for several. For a village or hamlet like Martin, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Keep children and pets away from the work area
- On commercial sites, let us know about site rules
Ask for a quote
For sand mastic in Martin, ring 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you will get a clear quote before we start.
Related advice
Leave it or put it right?
Gaps round a sash window let in rain and draughts. Water can get to the frame and the masonry, so dealing with it now protects both. Where a wall is exposed, as many are in small places like Martin, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or send us an email.
What you get with us
- An ARBOMaster approved applicator
- A 12-month guarantee on all work
- Tidy, careful work
- 20+ years of sealant experience
Also near Martin
What else we do in Martin
Surface by surface
Sash and case windows
On a sash window, the mastic joint shows on the outside, so a neat, even finish matters.
Brick reveals
Loose mastic comes out and deep gaps are packed before pointing.
Can I do it myself?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
Martin homes and the weather
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near Church of All Saints, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Martin is in Hampshire. Across the SP6 area, we cover sand mastic for homes and businesses. Martin is one of 683 towns and villages in Hampshire we cover. You can also see our page for Southampton, about 23 miles away.
Here we cover the SP6 postcode area for sand mastic. You will find streets such as Townsend Lane and Downview Road. Neighbouring places we cover for sand mastic include New Forest (1 mile south-west), Rockbourne (3 miles east) and Damerham (3 miles south-east). We also work in nearby towns such as Ringwood (11 miles south-east), Fordingbridge (6 miles south-east), St Leonards (11 miles south), Alderholt (6 miles south-east), Poulner (11 miles south-east) and Ashley Heath (10 miles south).
What’s near Martin
Well-known places in the area include Cranborne Castle Hill (4.5 miles south). Open spaces near Martin include Western Downs.
Martin: your questions answered
Can you do sand mastic in Martin?
Yes, Martin is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear quote.
Is sand mastic in Martin guaranteed?
All our work, in Martin and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We’ll tell you what we’re using and why.
Can old silicone round a sash window be swapped for sand mastic?
Yes, we do this often. All the old silicone is removed first so the mastic can sit properly.
Where do you work from?
We work from Crawley. Our applicators cover Martin, along with the rest of our area.
Can I paint the new mastic?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we’ll advise.
Do you work for letting agents?
Yes, we do. Domestic, commercial and hotel work are all part of what we do.
How long does sand mastic take?
A typical job takes anything from a few hours to a full day, depending on how many windows. We’ll confirm how long when we quote.
When to call us in Martin
Scraping and sanding before painting can loosen old mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
Signs it’s time to call us include:
- Weathered mastic on the most exposed windows
- Cracked mastic round a front door frame
- Silicone on a period window that looks wrong
- Tired mastic found when preparing windows for paint
Around Martin, as everywhere, sand mastic is only as good as the preparation behind it.
Comparing quotes
- When the joint can take water or movement
- What insurance they hold
- What guarantee comes with the work
- Whether all the old sealant comes out first
Looking after it afterwards
Good habits help new joints last longer. A few tips:
- Don’t run silicone over sand mastic
- Sort the mastic before the decorators arrive
- Look over the window mastic once a year
- Avoid heavy scraping on the mastic joint
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
Honest limits
We’d rather tell you now than do work that will not last, so these are the limits:
- Crumbling stone or brickwork round the window
- Decisions on consent for listed homes
- Sashes that rattle, stick or won’t open
If you’re not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Surfaces we seal
- Timber door frames
- Tenement windows
- Sash and case windows
- Period & listed homes
- Stone surrounds
- Brick reveals