South Lanarkshire · Scotland
Window Mastic in New Lanark
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in New Lanark. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Cracked internal joints between frame and plaster
- Cracked or shrunken mastic around the frame
- Water coming in at the bottom corners of a door
What sealant work cannot fix
We will always be straight with you, so here’s what new sealant won’t do:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- A frame that has rotted at the joint
- Damp coming through the wall itself rather than the frame joint
If in doubt, email us at info@mrmastic.co.uk and we’ll say what we think.
Joints and surfaces we work on
- uPVC windows
- Window sills
- Patio & French doors
- Aluminium frames
- Timber windows & doors
- Composite doors
Window mastic in New Lanark, done properly
The new joint does not have to be white. We can seal in white, brown, anthracite grey, black or clear, so the bead blends with the window rather than framing it. We work on aluminium frames, window sills and composite doors, and common reasons people get in touch are cracked or shrunken mastic around the frame and rain getting in at the frame or under the sill.
Mastic can only go onto a dry joint, so outside work in New Lanark depends on the weather, and longer journeys are planned in advance. Let us know about access to every frame, including any upstairs.
Every job is covered by our 12-month guarantee.
- Place
- New Lanark (ML11)
- Region
- South Lanarkshire
- Guarantee
- One year on every job
- Price
- A clear price before we start
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
Why it’s worth doing now in New Lanark
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. A reseal is a much smaller job. When the nearest tradesperson is a drive away, it’s tempting to leave a small leak, but water through a failed joint keeps working away until it’s fixed.
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first.
Why choose Mr Mastic in New Lanark
- You choose the colour before work begins
- ARBOMaster approved applicator
- Tidy, careful work
- We never seal over old sealant
See what affects the cost and customer reviews.
Landlords, agents and businesses in New Lanark
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
When to call us in New Lanark
Sills take more water than any other part of a window, and the ends of the sill, where it meets the wall, are where it gets in. Failed sealant there lets rain into the wall or behind the frame.
People normally contact us when they notice one of these:
- Sealant in the wrong colour for the frame
- Cracked or shrunken mastic around the frame
- Rushed sealant from a window installation
- Black, perished sealant on frames
If you look after a building such as Lanark Grammar School, the mastic around its windows and doors needs looking after like any other building’s.
Questions to ask before you book
- Whether you can choose the colour
- Is the old sealant removed completely?
- When the joint can take water or movement
- What the quote includes, VAT included or not
How it works
We bring everything the job needs with us, so you do not need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. Most jobs take anything from an hour or two to a full day, depending on how many frames there are. Outside jobs in New Lanark need a dry day, because sealant will not bond to a wet joint, so an outdoor job can move if the forecast changes. Work indoors isn’t affected.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Mention if the joints have been sealed before
- Mention any sign-in or site rules at work premises
- Clear the area around the work
Get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. Whenever you’re ready, send an email to info@mrmastic.co.uk.
Related advice
Also near New Lanark
Also in New Lanark
New Lanark questions
Is New Lanark within the area you cover?
Yes, we do. Our work covers the whole of Scotland, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Do you work for landlords with property near Lanark station?
Yes, rental work is part of what we do. Just email us at info@mrmastic.co.uk and tell us about the property, and we’ll give you a clear price.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Do you seal inside as well as outside?
Yes. Draughts often come through the inside gap too, so it can be worth sealing both.
Do you remove the old sealant?
Yes, every time. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we will explain our choice.
How much does window mastic cost in New Lanark?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You will get a clear quote before we start.
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Paint up to the joint, not over it
- Look round the frames every year or so
- Repaint timber before it’s bare
- Use gentle cleaners on frames and sealant
A yearly look round the frames is enough. Cracks and lifting edges are easy to spot early, and if anything looks wrong, just drop us a line at info@mrmastic.co.uk.
Signs to watch for: split or missing mastic, gaps, damp patches inside or black mould on the reveal. If you notice one, it’s time to get the joint looked at.
Window mastic in New Lanark: local notes
Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and sound outside sealant is part of that. Many older homes in Scotland have sash and case windows, often pointed into the wall with traditional sand mastic.
In the older streets around New Lanark Church, the joint between an old wall and a newer frame is normally the first place rain gets in. Rented homes near Lanark station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
New Lanark is about 1 mile south of Lanark, in South Lanarkshire. From the centre of New Lanark to the outskirts, we cover window mastic for every kind of property, from flats and houses to offices and hotels. New Lanark is one of 139 places in South Lanarkshire where we work. You can also see our page for Glasgow, roughly 23 miles from New Lanark.
Our applicators cover all of ML11 for window mastic and the streets around it. Whether your property is on Braxfield Road, New Lanark Road and Rosedale Street or anywhere close by, our applicators can take on the job. We also cover the places around New Lanark: Lanark (1 mile north), Kirkfieldbank (1 mile north-west), Nemphlar (2 miles north-west), Cleghorn (2 miles north-east) and Cartland (2 miles north). Further out, we also cover Hamilton (13 miles north-west), Blantyre (15 miles north-west), Larkhall (9 miles north-west), Carluke (5 miles north-west), Strathaven (11 miles west) and Bothwell (15 miles north-west).
What’s near New Lanark
Around New Lanark, our work takes us to homes and buildings near Castlebank Park and The Wee Man's pub, among other places. The closest station to New Lanark is Lanark station, roughly 0.8 miles north-east of the centre. Well-known places in the area include William Smellie Memorial Hospital (1 mile north) and New Lanark Visitor Centre (under half a mile south-east). Open spaces near New Lanark include Lanark Loch and Black Hill.