South Lanarkshire · Scotland
Ashgill Window Mastic
Window mastic for Ashgill, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Rushed sealant from a window installation
- Cracked sealant at the sill ends
- Cracked internal joints between frame and plaster
Window mastic in Ashgill, done properly
Over two decades of sealing frames has taught us which products suit which walls. We’re fully insured ARBOMaster approved applicators, and we give a one-year guarantee on the work. We are often asked to deal with old mastic that has gone black or come away and whistling draughts around closed windows, on window sills, aluminium frames and patio & French doors.
Mastic can only go onto a dry joint, so outside work in Ashgill depends on the weather, and longer journeys are planned in advance. Let us know about access to every frame, including any upstairs.
The work is covered for a year after we finish. If anything isn’t right with it, send an email to info@mrmastic.co.uk.
- Where
- Ashgill (ML9)
- Region
- South Lanarkshire
- Cover
- A year, on every job
- Price
- A clear quote up front
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Landlords, agents and businesses in Ashgill
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
Your questions about window mastic in Ashgill
Can you do window mastic in Ashgill?
Yes, Ashgill is within the area we cover. We work across all of Scotland. You can email us at info@mrmastic.co.uk and let us know what needs doing.
Will you come out to Ashgill?
Yes, smaller places are covered as well as towns. Our work covers the whole of Scotland. Let us know about access, parking and anything unusual about getting there when you book.
Is the new sealant paintable?
Not generally, if it’s silicone. Tell us your decorating plans and we will pick a sealant to suit.
Can you do several jobs on one visit?
Yes. More than one area can be quoted together.
Will resealing my frames help with draughts?
In many cases. The gap between frame and wall is a common source of draughts, and sealing the inside and outside joints closes that path.
Is there any odour?
There can be a smell while the sealant cures, but it fades. Opening a window helps.
Can you seal the gap between the frame and the plaster indoors?
Yes, we do both. Indoors, we seal between the frame and the plaster or reveal, using a paintable sealant if you want to decorate.
Is it OK to seal over old sealant?
No, it won’t last. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
When it isn’t the sealant
We will always be straight with you, so here’s what new sealant will not do:
- Damp coming through the wall itself rather than the frame joint
- Rotten timber, which needs a joiner first
- Worn gaskets, brush seals or a door that has dropped
If you are not sure, just drop us a line at info@mrmastic.co.uk and we’ll give you a straight answer.
Surfaces we seal
- Timber windows & doors
- Composite doors
- Window sills
- Aluminium frames
- uPVC windows
- Patio & French doors
What affects the cost of window mastic
Jobs vary more than people expect. What affects the quote:
- Whether old sealant or filler has to be cut out
- The number of rooms or windows
- The number and length of the joints
- Any mould that needs treating
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
Asking for a quote
To help us quote quickly, let us know:
- How many joints, rooms or windows are involved
- Where the job is, and your postcode
- How we’d reach the joints
- The type of property
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we will talk you through the work and give you a clear price.
What happens if it’s left?
Not every sealant suits a window. Interior caulk and bathroom silicone aren’t made for exterior frame joints. An exterior, low-modulus sealant stays flexible in sun and frost. Around Ashgill, water from a failed joint in an older stone home can soak into timber and plaster.
Combining jobs into one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Why choose Mr Mastic in Ashgill
- Trusted Arbo and Everbuild sealants
- More than 20 years in sealant work
- 12-month guarantee on every job
- Anti-fungal sanitary silicone in wet areas
See our cost guide or customer reviews.
What the job involves on each surface
Patio & French doors
Water at the foot of a door frame isn’t always the mastic: blocked drain slots, worn brush seals and threshold details can let water in too. We check before we reseal.
Window sills
Sills catch the water running down the glass, so the sill ends and the joint under the frame are vital. Each is cleaned out and resealed.
Also in Ashgill
Ashgill homes and the weather
Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and sound outside sealant is part of that. 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.
Schools such as Larkhall Academy are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. Rented homes near Larkhall station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Homes close to Dalserf Kirk include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in.
Ashgill is about 2 miles east of Larkhall, in South Lanarkshire. We carry out window mastic for homes and businesses in Ashgill and nearby. We cover 139 towns and villages across South Lanarkshire, large and small. You can also see our page for Glasgow, about 16 miles away.
All of ML9 is covered for window mastic, from the main roads to the quietest streets. Streets in the area include Graham Place, Millburn Road and Douglas Drive, all of which we cover. Close by, we work in Dalserf (1 mile north-east), Swinhill (1 mile south-west), Larkhall (2 miles west), Waterloo (2 miles north-east) and Netherburn (2 miles south-east). Within a short drive, we also cover East Kilbride (10 miles west), Hamilton (6 miles north-west), Cambuslang (10 miles north-west), Uddingston (9 miles north-west), Blantyre (8 miles north-west) and Carluke (4 miles east).
Near you in Ashgill
The closest station to Ashgill is Larkhall station, roughly 1.8 miles west. Other landmarks nearby include Mauldslie Castle (1.3 miles east) and University Hospital Wishaw (3.1 miles north). Open spaces near Ashgill include Baron's Haugh RSPB Reserve and Black Hill.
Should I try it myself first?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
How the visit works
At the end, we look at the finished work together and tell you how long to leave it. The visit itself usually takes a morning for a couple of windows and a door, depending on the size of the job. Around Ashgill, distance and access matter more than parking. Tell us how to find the property and how to reach the work.
- We start by checking each window and door with you.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Every joint is checked before we leave.
Before we arrive
- Move anything stored near the joints
- Mention any parking rules near the property
- Tell us about access, such as stairs, a lift or high-level joints
Get a quote
We quote each job on its own. Just drop us a line at info@mrmastic.co.uk with the details and send pictures if you have them.