Midlothian · Scotland
Window Mastic in Old Pentland
Mastic around window and door frames, sills and patio doors in Old Pentland, with a one-year guarantee on every job. Ask us for a quote.
- Gaps where the sill meets the wall
- Black, perished sealant on frames
- Rushed sealant from a window installation
How it works
We bring everything the job needs with us. Once we’ve agreed what’s being done, we protect the area and start. It normally takes anything from an hour or two to a full day, depending on how many frames there are. Outdoor work around Old Pentland depends on the weather, as sealant needs a dry surface, so an outdoor job can move if the forecast changes. Work indoors is not affected.
- We start by checking each window and door with you.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
How to prepare
- For business premises, tell us about site rules or sign-in
- For indoor joints, keep the area dry beforehand if you can
- Let us know about stairs, lifts or work at height
Getting a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear quote for your job. To get started, send an email to info@mrmastic.co.uk.
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Window mastic in Old Pentland
Every window and door frame has a gap around it, and mastic is what closes it. Once that seal fails, wind and rain find the gap. The old mastic is removed and the joint resealed with a flexible exterior sealant. If you’re dealing with a bead that doesn’t match the frame and gaps between the frame and the inside reveal, we can help.
Older stone-built homes in Scotland often have sash and case or timber windows set in stone. The sealant has to suit the stone, which rules out acetoxy silicones that can mark or attack it.
You get a one-year guarantee, the same in Old Pentland as everywhere else we work.
- Location
- Old Pentland (EH20, EH10)
- Region
- Midlothian
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Quotes for window mastic in Old Pentland
Every job gets its own quote. These are the things that affect it:
- Any working-time requirements on site
- Mould in or behind the old joints
- The number and length of the joints
- How easy the joints are to reach
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
What we need to know
When you call or email, it’s useful to know:
- Access, such as stairs, a lift or height
- The problem you’ve noticed
- A few pictures by email, if you can
- If it’s domestic, commercial or a hotel
It all starts with a short chat. Describe the problem, the location and the size of the job. When it suits you, send an email to info@mrmastic.co.uk.
Looking after it afterwards
So the new joints stay in good condition:
- Do not paint over the silicone
- Check the mastic once a year
- Keep solvents and bleach off the sealant
- Do not aim a pressure washer at the joints
Keep sill grooves and drainage slots clear, so water can run away instead of sitting against the joint.
A small gap around a frame only grows. As old mastic keeps shrinking, the gap widens, and heat escapes around the frame. A new joint closes it up.
Frames and glazing around Old Pentland
Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and failed outside joints work against that. 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 such as Melville Castle, about 3.1 miles east, show how far back building around Old Pentland goes. For landlords with property near Slateford station, renewing tired window mastic between tenants heads off draught and damp complaints.
Old Pentland is about 3 miles west of Bonnyrigg, in Midlothian. We provide window mastic to homeowners, landlords and businesses in Old Pentland and nearby, as part of our work across Midlothian. Old Pentland is one of 33 places in Midlothian we cover.
Work in EH20 and EH10 is quoted and booked the same way as anywhere else. If you are just outside Old Pentland, we cover Hillend (1 mile west), Bilston (1 mile south), Loanhead (1 mile east), Burdiehouse (1 mile north-east) and Roslin (2 miles south). Within a short drive, we also cover Bonnyrigg (3 miles east), Dalkeith (5 miles east), Penicuik (4 miles south-west), Gorebridge (6 miles south-east), Newtongrange (5 miles east) and Mayfield (6 miles east).
Local landmarks in Old Pentland
Old Pentland’s nearest station is Slateford station, roughly 3.8 miles north-west of the centre. Nearby you will also find Cameron Toll Shopping Centre (3.1 miles north) and Princess Margaret Rose Orthopaedic Hospital (1.2 miles north-west). Green spaces nearby include Caerketton Hill and The New Leaf Co-op.
Questions from Old Pentland
Do you work for landlords with property near Slateford station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can send an email to info@mrmastic.co.uk with the details for a clear quote.
Can you do window mastic in Old Pentland?
Yes, Old Pentland 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 reach windows above the ground floor?
Normally, yes. Access is planned before work begins, so mention the height and anything in the way.
Do you guarantee window mastic?
Yes. Every job comes with our 12-month guarantee, and we are fully insured.
Do you have insurance?
Yes. We are fully insured, and we can confirm the details when we quote.
Can you do the inside joint as well?
Yes. Plenty of draughts come through the inside joint as well as the outside, so sealing both is often worthwhile.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done.
Are you an approved applicator?
Yes. We’re an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Signs you need window mastic in Old Pentland
Plenty of failed mastic was poorly applied in the first place. Sealant run over dust, wet brick or loose mortar didn’t grip properly, and it lets go sooner than it should.
Look out for any of the following:
- Cracked internal joints between frame and plaster
- Draughts coming in around windows and doors
- White mastic on grey or black frames
- Mastic that has split away from the wall
For site and facilities teams at buildings such as Gracemount High School, the mastic around its windows and doors needs looking after like any other building’s.
Comparing quotes
- What product goes in the joint
- Are they insured?
- How the colour is chosen
- Whether VAT is included
Honest limits
A few problems are outside what sealant work can do:
- Faulty window hardware
- A door that needs adjusting, rehanging or new seals
- Damp coming through the wall itself rather than the frame joint
Not sure which it is? You can drop us a line at info@mrmastic.co.uk and we’ll tell you honestly before you book.
What we seal
- Timber windows & doors
- Window sills
- Aluminium frames
- uPVC windows
- Composite doors
- Patio & French doors
Leave it or put it right?
A quick bead over the top of old mastic looks like an easy fix, but new sealant cannot bond to old, crumbling mastic. It soon lifts and the leak carries on behind it. The old mastic has to come out. When the nearest tradesperson is a drive away, it’s tempting to leave a small leak, but water behind a failed seal does the most damage when nobody’s watching.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs. Ask us for a quote and we will explain what it covers.
Why choose Mr Mastic in Old Pentland
- ARBOMaster approved applicator
- Homes, businesses and hotels
- We never seal over old sealant
- You choose the colour before work begins
Surface by surface
Timber windows & doors
Wood swells when it’s wet and shrinks when it dries, so the joint must stay flexible. We seal onto sound, dry paintwork or timber.
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so we use a flexible, low-modulus sealant. We match white, brown, anthracite grey and black frames.