North Lanarkshire · Scotland
Bonkle Window Mastic
Window mastic across Bonkle and nearby, with every bit of old sealant taken out first.
- A bead that doesn’t match the frame
- Mastic that is falling out in pieces
- Gaps where the sill meets the wall
Window mastic for homes and businesses in Bonkle
There are two joints on most windows. Outside, the mastic keeps rain out; the internal joint closes the gap to the plaster and stops draughts. Either or both can be done. We work on composite doors, timber windows & doors and aluminium frames, and people most often call us about cold air getting in at the frame edge and untidy mastic left by window fitters.
Mastic can only go onto a dry joint, so outside work in Bonkle depends on the weather. Tell us about access to all the windows and doors, upstairs included.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Location
- Bonkle (ML2)
- Wider area
- North Lanarkshire
- Cover
- One year on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
DIY versus a professional finish
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so tell us about it when you ask for a quote.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Nearby places to Bonkle
Also in Bonkle
When to call us in Bonkle
Every frame moves through the day. Sun on a frame makes it expand, and it contracts again overnight, while the masonry beside it stays put. A sealant that can’t keep up eventually tears.
The problems people generally mention when they call include:
- Black, perished sealant on frames
- Gaps left after new windows were fitted
- Mastic that has split away from the wall
- Rain getting in at the frame or under the sill
In the older streets around Bonkle Parish Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What your quote should include
- How the colour is chosen
- The length of the guarantee
- Is the old sealant removed completely?
- Who does the work, and how experienced they are
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
For anyone letting property in or around Bonkle, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
Window mastic in Bonkle: local notes
Many older homes in Scotland have sash and case windows, and the joint between the box frame and the stone or render is traditionally pointed with sand mastic. Historic houses like Cambusnethan House (about 4.3 miles south-west) are a reminder that the area around Bonkle has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
Managing a site like Coltness High School? Then larger buildings have plenty of frames, and the mastic around each one ages. Rented homes near Hartwood station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Bonkle is about 3 miles east of Wishaw, in North Lanarkshire. Every kind of property in Bonkle is covered for window mastic. The work is guaranteed for a year. Bonkle is one of 89 places in North Lanarkshire where we work for window mastic. You can also see our page for Glasgow, about 17 miles away.
We work across the ML2 postcode area for window mastic and the streets around it. Window mastic is available to properties on Church Road, Brownhill View and Cairney Place and the roads around them. Neighbouring places we cover for window mastic include Crindledyke (1 mile south-west), Allanton (1 mile north-east), Newmains (1 mile west), Morningside (1 mile south) and Chapel (1 mile south). Within a short drive, we also cover Motherwell (5 miles west), Cumbernauld (12 miles north-west), Coatbridge (8 miles north-west), Airdrie (7 miles north-west), Wishaw (3 miles west) and Bellshill (7 miles west).
Around Bonkle
The nearest railway station is Hartwood station, roughly 1.5 miles north-east. Nearby you will also find Murdostoun Castle (0.8 miles west) and Cleland Hospital (2.1 miles west). Green spaces nearby include Allanton House lake.
How the job changes by surface
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We can talk through the options.
Patio & French doors
Patio and French doors have the longest joints on most houses. Most leaks start at the bottom corners, so they get particular care.
Keeping the joints in good condition
Looking after new joints is easy:
- Clean frames with a soft cloth and soapy water
- Keep drainage slots and sill grooves clear
- Avoid blasting the frames with a pressure washer
- Look round the frames every year or so
Most silicone sealants will not take paint, so mention any painting plans before any work starts. There are paintable sealants for joints that need it.
Leaks normally show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
What affects the cost of window mastic
The price is agreed before any work begins. It’s based on:
- Which sealant suits the joint
- How many areas need sealing
- Whether old sealant or filler has to be cut out
- Whether the work is at height
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Whether it’s a home or a business
- A few pictures by email, if you can
- If someone has resealed it before
- How many joints, rooms or windows are involved
If you are in Bonkle and need window mastic, drop us a line at info@mrmastic.co.uk. A short description of the job and where it is helps us quote, and you will get a clear quote before work begins.
Your questions about window mastic in Bonkle
Can you do window mastic in Bonkle?
Yes, Bonkle 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 will give you a clear quote.
Can you help a landlord with a rental near Hartwood station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can email us at info@mrmastic.co.uk with the details for a clear quote.
Should I try DIY first?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
Do you seal inside as well as outside?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We can do either or both.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Will resealing my frames help with draughts?
In many cases. Air often gets in between the frame and the wall, and resealing inside and out closes it.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
What do you need from me for a quote?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply email us at info@mrmastic.co.uk.
The process
Once we are on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take a few hours for a few frames, or a day or more for a whole house. For a place like Bonkle, longer drives are planned in advance. Tell us about tracks, gates, a ferry crossing or anything unusual about getting there.
- 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.
- Finally we tidy up and check each joint.
How to prepare
- Keep pets and children clear of the area while we work
- For indoor joints, keep the area dry beforehand if you can
- Let us know about earlier repairs to the joints
Getting a quote
Getting a quote is simple: let us know the job and the location and its rough size. A few photos by email make the job easier to understand, and we’ll take it from there.