Midlothian · Scotland
Penicuik Window Mastic
Mastic around window and door frames, sills and patio doors for Penicuik, backed by a 12-month guarantee. Call for a quick quote.
- Gaps left after new windows were fitted
- Sealant in the wrong colour for the frame
- Cracked sealant at the sill ends
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Window mastic for homes and businesses in Penicuik
A cold draught around a closed window often comes from the frame edge. A new joint stops the air getting through and quietens the whistle on windy days. Where the air is getting in through the window itself, we will say so. We work on uPVC windows, composite doors and aluminium frames, and the jobs we see most are untidy mastic left by window fitters and hard, cracked sealant around windows.
In a town like Penicuik, plenty of homes have harled (roughcast) walls, and the joint between a frame and rough harling needs a sealant that can grip and flex. A thin bead that hasn’t been worked into the surface soon lets water behind it.
You get a 12-month guarantee, the same in Penicuik as everywhere else we work.
- Location
- Penicuik (EH26)
- Region
- Midlothian
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Aftercare tips
After the cure time, these simple habits help:
- Keep jet washers away from the mastic
- Repaint timber before it’s bare
- Ventilate rooms so frames don’t stay wet inside
- Keep paint off silicone joints
Try not to touch the new joint while it cures, for as long as we advise. Keep jet washers away from the frames.
A small gap around a frame only grows. As the old mastic shrinks further, more air gets through, and a cold room gets colder. Resealing closes it.
What happens if it’s left?
A quick bead over the top of old mastic looks like an easy fix, but it will not grip old, dirty sealant. It soon lifts and the leak carries on behind it. The old mastic has to come out. Scottish weather finds any gap, and in a town like Penicuik, failed outside joints soon let damp into walls. Indoors, failed sealant lets water into floors and ceilings.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we’ll explain the quote if you ask.
Why Penicuik clients choose us
- A choice of colours where the product allows
- Trusted Arbo and Everbuild sealants
- Rated 4.9 stars on Google
- You choose the colour before work begins
Take a look at how sealant jobs are priced and customer reviews.
Your questions about window mastic in Penicuik
What’s the best way to get a price for window mastic in Penicuik?
Just drop us a line at info@mrmastic.co.uk and let us know what needs doing and where. You will get a clear, fixed price before any work starts.
Do you cover Penicuik for window mastic?
Yes, Penicuik is within the area we cover. Our work covers the whole of Scotland. You can email us at info@mrmastic.co.uk and let us know what needs doing.
Can you do upstairs windows?
Yes, as long as they can be reached safely. Tell us about access when you get in touch so we can plan the job.
Do I have to be there?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
How long will my window job take?
The work takes most of a day for a typical house, less for a few frames. Access and the amount of old mastic make the biggest difference.
What sealant do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We will tell you what we’re using and why.
Are you fully insured?
Yes. Mr Mastic is fully insured.
Do you seal inside as well as outside?
Yes, we do both. Indoors, we seal between the frame and the plaster or reveal, using a paintable sealant if you want to decorate.
Windows and doors in Penicuik
Many older homes in Scotland have sash and case windows, often pointed into the wall with traditional sand mastic. Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and failed outside joints work against that.
Around Penicuik, as everywhere, window mastic is only as good as the preparation behind it.
Penicuik is about 8 miles south of Edinburgh, in Midlothian. Wherever you are in the EH26 postcode area, our applicators can take on window mastic. Across Midlothian, we cover 33 places, and Penicuik is one of them. Our Edinburgh page covers work nearby.
Work in EH26 is quoted and booked the same way as anywhere else. Local streets include Windsor Square, High Street and The Square, and we cover them all. Being close to the A701 and A702, Penicuik is simple for us to get to. We also cover the places around Penicuik: Milton Bridge (1 mile north-east), Howgate (2 miles south-east), Silverburn (2 miles west), Swanston (4 miles north) and Bonaly (5 miles north). Further out, we also cover Bonnyrigg (5 miles north-east), Dalkeith (7 miles north-east), Loanhead (4 miles north-east), Gorebridge (7 miles east), Newtongrange (7 miles east) and Mayfield (8 miles east). As one of the bigger places in Midlothian, Penicuik has homes, rented property and businesses of every kind.
What’s near Penicuik
In Penicuik, that means homes and buildings near Craigiebield House Hotel, among other places. A little further out are Rosslynlee Hospital (1.7 miles north-west) and Penicuik Paper Heritage Museum (0.7 miles south). The countryside around Penicuik includes Edgelaw Reservoir and Turnhouse Hill.
The process
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a few hours for a handful of frames, longer for a whole house and we leave things clean and tidy. For a job in Penicuik, tell us where the work is, how to get in and where to park. Outside work depends on the weather, as sealant needs a dry surface.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- 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.
Before we arrive
- Keep children and pets away from the work area
- On commercial sites, let us know about site rules
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we will talk you through the work and send you a clear quote.
Read more
What sealant work cannot fix
We won’t take on work that will not last, so here’s what sealant can’t put right:
- A failed sealed unit that has misted up
- A sash or casement that won’t close properly
- Worn gaskets, brush seals or a door that has dropped
If you’re not sure, just drop us a line at info@mrmastic.co.uk and we will give you a straight answer.
Surfaces we seal
- Aluminium frames
- uPVC windows
- Patio & French doors
- Composite doors
- Window sills
- Timber windows & doors
Do you need window mastic in Penicuik?
Mastic ages in the weather. Sunlight dries the surface out, and over the years it loses its give, cracks and comes away.
These are the problems we are asked about most:
- Mastic that has split away from the wall
- Whistling draughts around closed windows
- Cracked sealant at the sill ends
- Gaps between the frame and the inside reveal
Managing a site like Beeslack Community High School? Then its window and door frames need their mastic kept sound, just like a home’s.
What your quote should include
- Which colour the sealant will be
- What insurance they hold
- Who turns up on the day
- What the quote includes, VAT included or not
For landlords and businesses
For anyone letting property in or around Penicuik, jobs at different addresses can go on one quote. Send us the addresses and the work at each, and pictures by email help.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.