South Lanarkshire · Scotland
Lesmahagow Sand Mastic
Our applicators work in Lesmahagow on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly.
- Crumbling sand mastic round a window
- Gaps round a timber door in stone or brick
- Wind and rain getting in round a sash window
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Ask a joiner to look at soft timber first
- Leave the new mastic unpainted
- Keep modern sealant off the mastic
- Sort the mastic before the decorators arrive
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look rather than patching it.
Sound mastic protects the frame. Once it fails, water can sit against the timber, which can lead to rot.
Sand mastic in Lesmahagow, done properly
A silicone bead around a sash window can look out of place and does not suit the building. Sand mastic gives a finish that matches the age of the house, and we can replace one with the other. We work on sash and case windows, tenement windows and stone surrounds, and the jobs we see most are old cement repairs round a window that have failed and mastic dropping out of the joint.
Mastic can only go onto a dry joint, so outside work in Lesmahagow depends on the weather. Let us know about access to every frame, including any upstairs.
A one-year guarantee comes as standard.
- Place
- Lesmahagow (ML11)
- Region
- South Lanarkshire
- Guarantee
- 12 months on all our work
- Price
- A clear price before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
What affects the cost of sand mastic
The price is agreed before any work begins. It takes into account:
- The number and length of the joints
- Access and height
- Which sealant suits the joint
- Any working-time requirements on site
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
Asking for a quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- A few pictures by email, if you can
- Where the job is, and your postcode
- What’s wrong with the joints now
- The type of property
Getting a quote is simple: let us know the job and the location. Photos by email help us understand the job.
For landlords and businesses
If you manage several properties in or around Lesmahagow, jobs at different addresses can go on one quote. Send us the addresses and the work at each.
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 that we can handle for you.
Signs you need sand mastic in Lesmahagow
Timber swells and shrinks with the weather. That movement opens up the mastic joint little by little.
It’s worth asking for a quote if you see:
- Failed mastic on an exposed elevation
- Silicone on a period window that looks wrong
- Tired mastic found when preparing windows for paint
- Mastic dropping out of the joint
Managing a site like Lesmahagow High School? Then the mastic around its windows and doors needs looking after like any other building’s.
Questions to ask before you book
- Whether VAT is included
- Whether they seal over old material or remove it
- Which sealant they’ll use, and why
- Whether they’re fully insured
Lesmahagow questions
Do you cover smaller places like Lesmahagow?
Yes, smaller places are covered as well as towns. 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 Lesmahagow guaranteed?
All our work, in Lesmahagow and everywhere else, comes with a 12-month guarantee. We’re also fully insured and ARBOMaster approved.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Which is right for my windows, sand mastic or modern sealant?
It depends on the window. Period windows in stone or brick usually suit sand mastic and newer frames usually get a flexible sealant.
Do you offer different sealant colours?
Usually, yes. Sealants come in white, clear, grey and other colours, and we agree the colour with you before work begins.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Do I have to be there?
That depends on where the joints are. Inside work needs someone to give us access, and for outside work we’ll agree access with you when we book.
What sealant do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Why act early in Lesmahagow
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. In a place like Lesmahagow, small leaks are easy to put off, but water behind a failed seal does the most damage when nobody’s watching.
The cost depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before we start.
Why book with us
- Over 20 years’ experience
- 180+ five-star Google reviews
- We’re fully insured
- An ARBOMaster approved applicator
Surface by surface
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It gives a traditional finish.
Stone surrounds
The stone is treated with care when the old mastic comes out.
What sand mastic looks like in Lesmahagow
Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that. Many older homes in Scotland have sash and case windows, often pointed into the wall with traditional sand mastic.
Homes close to Lesmahagow Old Parish Church include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in.
Lesmahagow is about 7 miles south of Carluke, in South Lanarkshire. Across the ML11 area, we can carry out sand mastic at your property. Our area takes in 139 places across South Lanarkshire, from the larger towns to small villages. Glasgow is on our list too, about 21 miles from Lesmahagow.
Here we cover the ML11 postcode area for sand mastic. If you need sand mastic at a property on Station Road, Abbeygreen and Cordiner Road or a nearby road, our applicators can take on the job. Neighbouring places we cover for sand mastic include Brocketsbrae (1 mile east), New Trows (1 mile south), Devonburn (1 mile south-east), Dillarburn (1 mile north-east) and Auchenheath (2 miles north). Larger places within reach include East Kilbride (15 miles north-west), Hamilton (11 miles north-west), Uddingston (15 miles north-west), Blantyre (13 miles north-west), Larkhall (8 miles north-west) and Carluke (7 miles north).
Near you in Lesmahagow
Other landmarks nearby include Craignethan Castle (4 miles north) and Birkwood Castle (less than half a mile south). Green spaces nearby include Black Hill.
Towns and villages near Lesmahagow
Other services in Lesmahagow
What we do, step by step
All our tools and materials come with us in the van, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. Most jobs take a few hours for a single window, longer for several. Around Lesmahagow, distance and access matter more than parking. Tell us how to find the property and how to reach the work.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Let us know about stairs, lifts or work at height
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about parking restrictions
Ask for a quote
We quote each job on its own, so start by telling us what you need. Simply send an email to info@mrmastic.co.uk and describe the job, and pictures are welcome.