Glasgow · Scotland
Window Mastic in Simshill
Our applicators work in Simshill on mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Untidy mastic left by window fitters
- Gaps where the sill meets the wall
- Water coming in at the bottom corners of a door
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
We also work for property managers and facilities teams. We can quote a run of properties together, and we’re fully insured for the work.
Window mastic for homes and businesses in Simshill
If you can feel air around a shut window, the gap is often at the frame. Resealing that joint can make a room feel noticeably less draughty and quietens the whistle on windy days. If the draught is through the window seals instead, we’ll tell you. Common call-outs are for gaps left after new windows were fitted and rain getting in at the frame or under the sill, on timber windows & doors, composite doors and uPVC windows.
Simshill is in one of Scotland’s four big cities, where many older buildings are sandstone or granite. Natural stone around older windows needs a sealant that won’t mark or attack it, which generally means a neutral-cure product or a traditional sand mastic rather than an acetoxy silicone.
We stand behind the work with a one-year guarantee.
- Location
- Simshill (G44, G45)
- Region
- Glasgow
- Cover
- 12 months on all our work
- Quote
- A clear price before we start
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
When it isn’t the sealant
It helps to know what we can’t do:
- Damp problems in the wall away from the window
- Broken hinges, locks or handles
- A door that needs adjusting, rehanging or new seals
If you’re not sure, just drop us a line at info@mrmastic.co.uk and we’ll give you a straight answer.
Joints and surfaces we work on
- Patio & French doors
- uPVC windows
- Aluminium frames
- Window sills
- Composite doors
- Timber windows & doors
Places near Simshill
What else we do in Simshill
The process
Once we are on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours for a few frames, or a day or more for a whole house. Parking in city streets around Simshill can be tight or controlled, so it helps to know about permits or nearby bays. For flats, mention the door entry system and any shared-stair arrangements.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
How to prepare
- Let us know about parking restrictions
- Keep children and pets away from the work area
- Move anything stored near the joints
How to get a quote
Every job is quoted individually, so the first step is telling us about yours. Just drop us a line at info@mrmastic.co.uk with the details, and pictures are welcome.
Advice
Leave it or put it right?
If you are painting or rendering, reseal at the same time. A clean new bead makes new paint or render look finished, and it’s easier while the walls are being worked on anyway. For landlords in Simshill, damp and leaks can be a Repairing Standard issue, so it’s worth fixing failed sealant before a tenant reports it.
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why us?
- Over 20 years’ experience
- Anti-fungal sanitary silicone in wet areas
- Any old sealant cut out fully, not covered over
- You choose the colour before work begins
See our cost guide or what customers say.
Questions from Simshill
Do you cover Simshill for window mastic?
Yes, Simshill is within the area we cover. Our work covers the whole of Scotland. Just send an email to info@mrmastic.co.uk with a few details of the job, and we’ll give you a clear price.
Who arranges sealant work on the shared parts of a tenement in Simshill?
Shared parts of a tenement, such as the roof and outside walls, are normally repaired with the agreement of the owners, often through a property factor. Where the title deeds are silent, the Tenements (Scotland) Act 2004 fills the gaps. Windows often belong to the individual flat, but it’s worth checking your deeds.
Will the old sealant be removed?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Can you reach windows above the ground floor?
Yes, if safe access is possible. For high or awkward windows, we’ll tell you what access is needed.
Is it OK to seal over old sealant?
No. We remove every bit of old sealant first.
How much does window mastic cost in Simshill?
Size, access and the old material all affect the cost. Ask us for a quote.
Do you seal inside as well as outside?
Yes. Plenty of draughts come through the inside joint as well as the outside, so sealing both is often worthwhile.
Can you work on commercial sites?
Yes, regularly. We can plan bigger jobs in stages.
How the job changes by surface
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We will tell you if that is what we find.
Patio & French doors
Heavy door frames can move more than windows. A flexible sealant copes with that.
Windows and doors in Simshill
Much of Glasgow is built from red and blond sandstone, and porous sandstone needs a sealant that won’t mark it. Under the Tenements (Scotland) Act 2004, shared parts of a tenement, such as the roof and outside walls, are looked after by the owners together, and many buildings use a factor to arrange it. Windows normally belong to the flat, but the title deeds have the final say.
If you let a flat or house near Cathcart station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Schools such as St Margaret Mary's Secondary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Simshill is about 2 miles north-east of Giffnock, in Glasgow. Whether you’re in the middle of Simshill or further out, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our area takes in 183 places across Glasgow, large and small.
All of G44 and G45 is within our area for window mastic, from the main roads to the quietest streets. If you need window mastic at a property on Elmore Lane, Sween Avenue and Rhannan Road or a nearby road, we can help. Other places close to Simshill include Croftfoot (1 mile east), King's Park (1 mile north-east), Castlemilk (1 mile south-east), Polmadie (1 mile north-east) and Mount Florida (1 mile north). Within a short drive, we also cover Glasgow (3 miles north), Hillhead (5 miles north), Dowanhill (5 miles north-west), Woodlands (4 miles north), Woodside (5 miles north) and North Kelvinside (5 miles north).
Near you in Simshill
Typical jobs here are in homes near Couper Institute and Library and Cathkin Park, among other places. Simshill’s nearest station is Cathcart station, roughly 0.7 miles north-west. A little further out are Glasgow Victoria Infirmary (1.4 miles north-west) and Princes Square (3.4 miles north). For a walk, there’s Cathkin Braes.
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Keep paint and stain on wooden frames in good order
- Make sure the drainage slots aren’t blocked
- Paint up to the joint, not over it
- Look round the frames every year or so
Keep sill grooves and drainage slots clear, so rain drains out rather than building up at the sealant.
Draughts get worse, not better. As the old mastic shrinks further, more air gets through, and a cold room gets colder. Resealing closes it.
Signs you need window mastic in Simshill
A lot of older mastic was never designed to stay flexible. Once it has hardened, the frame’s movement tears it from the wall, leaving a hairline gap down one side.
If you can see any of these, it’s time to have the joints looked at:
- Gaps between the frame and the inside reveal
- Black, perished sealant on frames
- Gaps where the sill meets the wall
- Rain getting in at the frame or under the sill
Pollok House, about 2.9 miles north-west, is one of the historic houses in the wider area around Simshill.
Before booking anyone
- What product goes in the joint
- Which colour the sealant will be
- What the quote includes, VAT included or not
- The length of the guarantee