Scottish Borders · Scotland
Window Mastic in Newtown St Boswells
Professional window mastic in and around Newtown St Boswells, with every bit of old sealant taken out first.
- Untidy mastic left by window fitters
- Leaking joints at the ends of sills
- Draughty joints inside around the window
Window mastic in Newtown St Boswells
Whether it’s one leaking patio door or every frame on the house, the work is priced before anything is done. To get one, drop us a line at info@mrmastic.co.uk with the number of frames and any access details for window mastic in Newtown St Boswells. We work on aluminium frames, composite doors and patio & French doors, and people most often call us about rushed sealant from a window installation and rain getting in at the frame or under the sill.
Outdoor sealant needs a dry surface, so window work around Newtown St Boswells is planned around the weather. Tell us about access to all the windows and doors, upstairs included.
Big or small, you get the same one-year guarantee.
- Where
- Newtown St Boswells (TD6)
- Region
- Scottish Borders
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
What the job involves on each surface
Patio & French doors
Patio and French doors have the longest joints on most houses. Most leaks start at the bottom corners, so we pay close attention there.
Composite doors
Draughts round the door leaf usually come from worn seals or adjustment, not the mastic. We’ll tell you if that is what we find.
What we cannot put right
It helps to know what we can’t do too:
- Draughts through the window seals rather than the frame
- A frame that has rotted at the joint
- Penetrating damp from a failed cavity tray or render
If you are not sure, just send an email to info@mrmastic.co.uk and we will give you a straight answer.
Joints and surfaces we work on
- Window sills
- Timber windows & doors
- Patio & French doors
- Composite doors
- uPVC windows
- Aluminium frames
How to look after the new joints
Looking after new joints is easy, and it makes a real difference:
- Check the mastic once a year
- Avoid blasting the frames with a pressure washer
- Paint up to the joint, not over it
- Repaint timber before it’s bare
Clean the frames with mild soapy water, and avoid solvent cleaners on the sealant.
Draughts get worse, not better. As the old mastic shrinks further, more air gets through, and heat escapes around the frame. Resealing closes it.
What affects the quote in Newtown St Boswells
Jobs vary more than people expect. What affects the quote:
- Any mould that needs treating
- The old material and how stubborn it is
- How many areas need sealing
- The amount of work
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Helping us quote
When you call or email, these details help:
- The problem you’ve noticed
- Any access issues, like height or stairs
- If someone has resealed it before
- A few photos by email, if you can
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved before giving you a price.
Can I do it myself?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
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, and the work is guaranteed for a year.
Also near Newtown St Boswells
Other services in Newtown St Boswells
Elsewhere in the Scottish Borders
Window Mastic in all 89 places in the Scottish Borders
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About window & door mastic
What we do, step by step
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes a few hours for a handful of frames, longer for a whole house from start to finish. Around Newtown St Boswells, distance and access matter more than parking. Let us know how to find you and how to reach the joints.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Mention if the joints have been sealed before
- Tell us if parking is tricky
Getting a quote
There’s no standard price list, because every job is different. Instead, we give you a clear quote for your job. To get started, send an email to info@mrmastic.co.uk.
Read more
Frames and glazing around Newtown St Boswells
Sash and case windows are common in older Scottish homes, often pointed into the wall with traditional sand mastic. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that.
Rented homes near Tweedbank station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints. Managing a site like Newtown Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Newtown St Boswells is about 6 miles south-east of Galashiels, in the Scottish Borders. Newtown St Boswells gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Newtown St Boswells is one of 89 towns and villages in the Scottish Borders we cover for window mastic. Edinburgh is on our list too, about 33 miles from Newtown St Boswells.
We cover every part of the TD6 postcode area for window mastic. That includes homes and businesses on Park Avenue, Park Crescent and Roxburghe Place and the roads around them. Other places close to Newtown St Boswells include Bowden (1 mile south-west), St Boswells (1 mile east), Newstead (2 miles north-west), Greycrook (2 miles south-east) and Melrose (2 miles north-west). Larger places within reach include Galashiels (6 miles north-west), Hawick (11 miles south), Kelso (10 miles east), Selkirk (7 miles west), Jedburgh (8 miles south-east) and Wilton (11 miles south-west).
Landmarks near Newtown St Boswells
The closest station to Newtown St Boswells is Tweedbank station, about 3.7 miles north-west of the centre. Well-known places in the area include Castle Holydean (2.5 miles south-west) and Commendators House Museum (2.2 miles north-west). Green spaces nearby include Bemersyde Moss and Eildon Hill North.
Leave it or put it right?
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. We cut out properly, back deep gaps and tool every joint neatly, in a sealant suited to the wall. Around Newtown St Boswells, water from a failed joint in an older stone home can soak into timber and plaster.
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please email us at info@mrmastic.co.uk and we will talk you through it.
Why book with us
- Colour picked to suit the job
- ARBOMaster approved applicator
- Experience in homes, commercial sites and hotels
- Rated 4.9 stars on Google
See how sealant jobs are priced and our reviews.
Newtown St Boswells questions
Will you come out to Newtown St Boswells?
Yes. Newtown St Boswells is within the area we cover, which takes in towns, villages and rural addresses. We work across all of Scotland. Let us know about access, parking and anything unusual about getting there when you book.
Do you cover Newtown St Boswells for window mastic?
Yes. Our work covers the whole of Scotland, and Newtown St Boswells is part of that. You can drop us a line at info@mrmastic.co.uk and tell us what needs doing, and we’ll give you a clear quote.
Do you have insurance?
Yes. Full insurance covers our work.
Can you reach windows above the ground floor?
Yes, where it’s safe. For high or awkward windows, we will tell you what access is needed.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we’re fully insured.
How long does it take to reseal the windows on a house?
A few frames take a few hours. You will get a timescale with the quote.
Do the sealants smell?
That depends on the sealant. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Is it OK to seal over old sealant?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.