South Lanarkshire · Scotland
Sand mastic for sash & case windows in Biggar, South Lanarkshire
Window and door surrounds in Biggar need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Weathered mastic on the most exposed windows
- Modern sealant on a period surround
- Patchy fillers round a sash window
Different surfaces, different methods
Sash and case windows
The mastic round a sash window is on show, so a neat, even finish matters.
Stone surrounds
We take care not to mark the stone while raking out the old mastic.
Sand mastic in Biggar
Burnt sand mastic is a traditional material that sits naturally against stone and brick. It suits period and listed homes, where modern sealant can look out of place. We work on sash and case windows, tenement windows and stone surrounds, and common reasons people get in touch are old sand mastic that has cracked, crumbled or fallen out and window mastic to renew ahead of painting.
Across smaller places in Scotland, homes range from stone and harled cottages to newer houses, many standing in the open. Wind-driven rain finds any gap around a frame or sill.
A 12-month guarantee comes as standard, so you’re covered after we’ve gone.
- Location
- Biggar (ML12)
- Wider area
- South Lanarkshire
- Cover
- A year, on every job
- Price
- A clear price before any work starts
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
More services for Biggar
Keeping the joints in good condition
Aftercare is simple, and it makes a real difference:
- Get any rot dealt with first
- Make sure water runs off the sill
- Ask us before painting near the mastic
- Ask the planning authority about consent for listed or conservation-area homes
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
How we quote for sand mastic
We do not publish a price list, because jobs vary so much. The quote depends on:
- Whether the work is at height
- Working hours on commercial sites
- The product the joint needs
- The old material and how stubborn it is
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
Asking for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- How we’d reach the joints
- Photos by email, if that’s easy
- Whether it’s a home or a business
- The problem you’ve noticed
Want a quote for sand mastic? Please drop us a line at info@mrmastic.co.uk with a few details. We will explain what we’d do and give you a clear quote before we start.
Biggar homes and the weather
Sash and case windows are common in older Scottish homes, and the joint between the box frame and the stone or render is traditionally pointed with sand mastic. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that.
For an older house near a landmark such as Biggar Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Biggar is about 14 miles south-east of Carluke, in South Lanarkshire. Wherever you are in the ML12 postcode area, we cover sand mastic for homes and businesses. We cover 139 towns and villages across South Lanarkshire, large and small. For nearby work, see our Edinburgh page (25 miles or so).
Postcode districts we cover here for sand mastic: ML12. We cover properties on High Street, Langvout Square and Market Road. Being close to the A702 and B7016, Biggar is simple for us to get to for sand mastic. Close by, we work 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). Further out, 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
In Biggar, that means homes and buildings near Little Mitchellwood and the streets around them. A little further out are Biggar Castle (under half a mile west) and Biggar Albion Museum (under half a mile north). Green spaces nearby include Chapelgill Hill.
For landlords and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
What happens on the day
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, do the work and clear up. Most jobs take a few hours per window, depending on the condition of the joints. Around Biggar, 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.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic isn’t too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
How to prepare
- Mention any tricky access
- Mention any leaks or damp you’ve noticed
- Try not to wet indoor joints just before the visit
Get a quote
Asking for a quote is easy: let us know the job and the location and its rough size. A few pictures by email make the job easier to understand, and we will take it from there.
Advice
Common problems we fix in Biggar
Over the years, sand mastic weathers. It dries out, cracks and loses its grip on the stone or timber.
It’s worth asking for a quote if you see:
- Gaps round a timber door in stone or brick
- Failed mastic on an exposed elevation
- Draughty sash windows at the surround
- Open joints round the window box
Managing a site like Biggar High School? Then the mastic around its windows and doors needs looking after like any other building’s.
Questions to ask before you book
- Who does the work, and how experienced they are
- Are they insured?
- Whether you can choose the colour
- How long the guarantee is
Biggar: your questions answered
Do you cover smaller places like Biggar?
Yes. Biggar 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.
Is sand mastic in Biggar guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status, and we are fully insured.
How long does sand mastic take to harden?
It skins over fairly quickly but takes longer to harden fully. We’ll tell you what to expect for your job.
Can I paint the new mastic?
The usual advice is to leave sand mastic unpainted. Ask us before you decorate around it and we will talk you through it.
How do I get a quote for sand mastic in Biggar?
Every job is different, so each one gets its own quote. To get one, drop us a line at info@mrmastic.co.uk and let us know what needs doing and where.
Do I need to be at home?
That depends on where the joints are. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Is it possible to take out silicone and use sand mastic instead?
Yes, we do this often. All the old silicone is removed first so the mastic beds in well.
When it isn’t the sealant
New sealant can’t fix everything, and we’d rather say so up front. It won’t solve:
- Planning or listed building consent (your local planning authority decides)
- Rotten sashes, sills or window boxes (a joiner’s job)
- Putty and glazing repairs
Not sure which it is? You can email us at info@mrmastic.co.uk and we will tell you honestly before you book.
What we seal
- Timber door frames
- Tenement windows
- Period & listed homes
- Stone surrounds
- Brick reveals
- Sash and case windows