South Lanarkshire · Scotland
Window Mastic in Biggar
Problem with your window and door frames in Biggar? We cut out the old, prepare the joints and apply the right sealant.
- Water coming in at the bottom corners of a door
- Gaps between the frame and the inside reveal
- Cold air getting in at the frame edge
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Avoid blasting the frames with a pressure washer
- Use gentle cleaners on frames and sealant
- Make sure the drainage slots aren’t blocked
- Do not paint over the silicone
Timber frames need their paint kept up, since wood that gets wet swells and shrinks more. Keep paint off the silicone itself.
Leaks usually show up in wet, windy weather, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
Window mastic in Biggar, done properly
The new joint doesn’t have to be white. White, brown, anthracite grey, black and clear sealants are all available, so the bead blends with the window rather than framing it. Common call-outs are for rain getting in at the frame or under the sill and old mastic that has gone black or come away, across timber windows & doors, aluminium frames and window sills.
Older stone-built homes in Scotland often have sash and case or timber windows set in stone. Those suit a traditional sand mastic or a neutral-cure sealant, not an acetoxy silicone that can attack some stone.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- Biggar (ML12)
- Wider area
- South Lanarkshire
- Cover
- A year, on every job
- Quotes
- A clear price before we start
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Other services in Biggar
Surface by surface
Patio & French doors
Patio and French doors have the longest joints on most houses. Most leaks start at the bottom corners, so they get particular care.
Timber windows & doors
Soft or rotten wood can’t be sealed successfully. If we find rot, we’ll tell you before going ahead, as that’s a job for a joiner.
What affects the cost of window mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- How much old sealant there is and how hard it is to remove
- When we can work, for business premises
- The type of sealant required
- The size of the job
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we will explain what it covers.
What we need to know
Before you ask for a quote, have a think about:
- If someone has resealed it before
- What’s wrong with the joints now
- How many joints, rooms or windows are involved
- How we’d reach the joints
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
What happens on the day
There’s no need to move everything out before we come, just the space around the work. We protect the rest, and the job takes most of a day for a typical house, less for a few frames for a typical job. Outside jobs in Biggar need a dry day, because sealant will not bond to a wet joint, so external jobs may need to move if the day turns wet. Work indoors isn’t affected.
- 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
- Let us know about parking restrictions
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about earlier repairs to the joints
Get a quote
Want a quote for window mastic? Please email us at info@mrmastic.co.uk and tell us about the job. We will explain what we’d do and give you a clear quote before we start.
Advice
What we’re called out for in Biggar
Mastic ages in the weather. Sunlight dries the surface out, and over the years it loses its give, cracks and comes away.
These are the problems we’re asked about most:
- Draughty joints inside around the window
- Draughts coming in around windows and doors
- Untidy mastic left by window fitters
- Rain getting in at the frame or under the sill
Homes close to Biggar Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before you book
- What guarantee comes with the work
- When the joint can take water or movement
- How much experience the applicator has
- What insurance they hold
FAQs for Biggar
Is there a guarantee on window mastic in Biggar?
Every job comes with our 12-month guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Do you cover Biggar for window mastic?
Yes. Our work covers the whole of Scotland, and Biggar is part of that. Just drop us a line at info@mrmastic.co.uk with a few details of the job, and we’ll give you a clear quote.
Can you do upstairs windows?
Yes, where they can be reached safely. Tell us about access when you get in touch and we’ll plan for it.
What do you need from me for a quote?
Let us know what needs doing and where, with pictures by email if possible. We’ll ask anything else we need to know.
Do you remove the old sealant?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Is it messy?
Very little: the area around the joints is protected first, and we tidy up before we go.
How long does it take to reseal the windows on a house?
A few frames take a few hours, while a whole house takes longer. We confirm the timing with your quote.
Do the sealants smell?
Some sealants have a smell while they cure, which fades as it sets. Opening a window helps.
What happens if it’s left?
A quick bead over the top of old mastic looks like an easy fix, but it won’t grip old, dirty sealant. It soon lifts and the leak carries on behind it. Proper resealing starts with removing the old joint. Out of town in Scotland, exposed walls take a lot of weather, and once water gets behind a failed joint, damp in stone or harled walls is slow to dry out.
What it costs depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before work begins.
Why book with us
- 20+ years of sealant experience
- A sealant colour to suit the surroundings
- Trusted Arbo and Everbuild sealants
- Experience in homes, commercial sites and hotels
Take a look at our cost guide or our reviews.
Landlords, agents and businesses in Biggar
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
What window mastic looks like in Biggar
Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that. Sash and case windows are common in older Scottish homes, often pointed into the wall with traditional sand mastic.
If you look after a building such as Biggar High School, the mastic around its windows and doors needs looking after like any other building’s.
Biggar is about 14 miles south-east of Carluke, in South Lanarkshire. If you need window mastic in Biggar, it’s easy to get a quote: please send an email to info@mrmastic.co.uk. We cover South Lanarkshire from our Crawley base, Biggar included. We cover 139 towns and villages across South Lanarkshire, large and small. You can also see our page for Edinburgh, about 25 miles away.
We cover every part of ML12 for window mastic and the streets around it. Streets in the area include High Street, Langvout Square and Market Road, and we cover them all. You will find Biggar on the A702 and B7016, which makes it straightforward to reach with everything needed for window mastic. Nearby, we also carry out window mastic in Skirling (3 miles north-east), Coulter (3 miles south), Quothquan (3 miles north-west), Candy Mill (3 miles north-east) and Symington (3 miles south-west). Within a short drive, we also cover Carluke (14 miles north-west), Lanark (10 miles west), Lesmahagow (14 miles west), Forth (12 miles north-west), Douglas (13 miles west) and Coalburn (14 miles west).
Near you in Biggar
We work in homes and buildings around Little Mitchellwood and the streets around them. Well-known places in the area include Biggar Castle (under half a mile west) and Biggar Albion Museum (less than half a mile north). Not far away are Chapelgill Hill.