Scottish Borders · Scotland
Sand mastic for sash & case windows in Newmill, Scottish Borders
Window and door surrounds in Newmill need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Old sand mastic that has cracked, crumbled or fallen out
- Window mastic to renew ahead of painting
- A silicone bead on a sash window that spoils the look
Questions from Newmill
Can you do sand mastic in Newmill?
Yes, Newmill is within the area we cover. Our work covers the whole of Scotland. You can send an email to info@mrmastic.co.uk and tell us what needs doing.
Do you cover smaller places like Newmill?
Yes, we do. Our work covers the whole of Scotland, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you have insurance?
Yes. We’re fully insured, and we have been doing sealant work for more than 20 years.
How long does sand mastic take?
That depends on the amount of work, but as a guide it takes a few hours for a single window, longer for several. We’ll give you a better idea when we quote.
Where is Mr Mastic based?
Our base is in Crawley, and we cover South East England, London and all of Scotland.
Can I choose the sealant colour?
Yes. Sealants come in white, clear, grey and other colours for many products, and we agree the colour with you before work begins.
Can you quote for more than one area?
Yes. More than one area can go on one quote.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area.
Sand mastic in Newmill
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditional guidance is not to paint over it, so ask us before you decorate. We work on brick reveals, timber door frames and period & listed homes, and people most often call us about a silicone bead on a sash window that spoils the look and cement or filler used on old window joints that has cracked.
Outdoor sealant needs a dry surface, so window work around Newmill is planned around the weather, and longer journeys are planned in advance. Tell us about access to all the windows and doors, upstairs included.
Whatever the size of the job, you get the same one-year guarantee in Newmill and across the Scottish Borders.
- Where
- Newmill (TD9)
- Wider area
- Scottish Borders
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
When it isn’t the sealant
We’d rather tell you now than do work that will not last, so these are the limits:
- Putty and glazing repairs
- Sash cords, weights and draught-proofing of the sashes
- Timber that has rotted
If you’re not sure, just send an email to info@mrmastic.co.uk and we’ll give you a straight answer.
What we seal
- Stone surrounds
- Brick reveals
- Tenement windows
- Timber door frames
- Sash and case windows
- Period & listed homes
What affects the quote in Newmill
Your quote is based on your job. We take into account:
- Whether the work is at height
- The size of the job
- The product the joint needs
- Any mould that needs treating
The cost depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts.
Asking for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Roughly how big the job is
- How we’d reach the joints
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, email us at info@mrmastic.co.uk.
What happens on the day
The work is kept neat and contained to the joints we’re treating, so you can get on with your day. The job usually takes a few hours per window, depending on the condition of the joints, and we tell you how long to leave it before we go. Around Newmill, distance and access matter more than parking. Let us know how to find you and how to reach the joints.
- We check the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Before we arrive
- Clear the area around the work
- For indoor joints, keep the area dry beforehand if you can
- Mention any sign-in or site rules at work premises
Get a quote
To get a quote, send an email to info@mrmastic.co.uk and tell us where the job is and what the problem looks like. We’ll give you a clear price before any work starts.
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What the job involves on each surface
Timber door frames
Door frames get knocked and soaked, so their mastic can fail sooner. It’s renewed by hand.
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
More services for Newmill
Leave it or put it right?
If you are redecorating, renew the mastic first. Paint over cracked mastic will not stop the gaps and traditional guidance is to leave the new mastic unpainted. In an older home around Newmill, damp from a failed joint can get into timber and plaster, which is a far bigger job than the sealant.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why choose Mr Mastic in Newmill
- Tidy, careful work
- We never seal over old sealant
- Over 20 years’ experience
- Quality sealants from Arbo and Everbuild
Take a look at our cost guide or customer reviews.
Landlord and commercial work in Newmill
Failed sealant is one of the commonest items on a check-out report. Several properties can go on one quote.
We work for landlords and letting agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
What sand mastic looks like in Newmill
Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and failed outside joints work against that. With historic houses such as Harden (about 2.9 miles north) nearby, there’s older building stock in the area around Newmill as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
In and around Newmill, as anywhere, good sand mastic starts with a clean, dry, properly prepared joint. Historic houses such as Harden, about 2.9 miles north, show how far back building around Newmill goes.
Newmill is about 4 miles south-west of Hawick, in the Scottish Borders. Every kind of property in Newmill can book us for sand mastic. The work is guaranteed for a year. Newmill is one of 89 towns and villages in the Scottish Borders where we work for sand mastic. Edinburgh is on our list too, around 41 miles away.
Here we cover the TD9 postcode area for sand mastic. Being close to the A7, Newmill is easy for our applicators to reach for sand mastic. If you’re just outside Newmill, we cover Wilton Dean (4 miles north-east), Wilton (4 miles north-east), Hawick (4 miles north-east), Stirches (5 miles north-east) and Burnfoot (5 miles north-east). Further out, we also cover Selkirk (12 miles north), Jedburgh (14 miles north-east), Denholm (9 miles north-east), Copshaw Holm (14 miles south) and Newtown St Boswells (15 miles north-east).
Landmarks near Newmill
A little further out are Branxholme Castle (1.2 miles north-east) and Hawick Cottage Hospital and Lamp Standard (3.8 miles north-east). Not far away are Branxholme Easter Loch.