Highland · Scotland
Sand mastic for sash & case windows in Castletown, Highland
Specialist sand mastic for Castletown: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Failed mastic on an exposed elevation
- Mastic that needs renewing before redecorating
- A silicone bead on a sash window that spoils the look
Common questions in Castletown
Will you come out to Castletown?
Yes, we do. We work across all of Scotland, and smaller places are part of that. Longer journeys are simply planned in advance.
Is sand mastic in a coastal place like Castletown any different?
Near the sea, outside joints face more wind, rain and salt than they would inland, so the choice of sealant and the preparation matter even more. Walls facing the sea are generally the first to need attention.
Can I add another job to the visit?
Yes. Just list everything you need and you’ll get one quote.
Will the old sealant be removed?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
Do I need permission for sand mastic on a listed building?
Check with your local planning authority. They’ll tell you if consent is needed.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we are fully insured.
What sealant do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Do I need to be at home?
That depends on where the joints are. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
About our sand mastic in Castletown
A silicone bead around a sash window can look out of place and doesn’t suit the building. Sand mastic gives a finish that matches the age of the house, and we can replace one with the other. We work on period & listed homes, sash and case windows and stone surrounds, and common reasons people get in touch are open joints round the window box and silicone on a period window that looks wrong.
Outdoor sealant needs a dry surface, so window work around Castletown is planned around the weather, and longer journeys are planned in advance. Tell us about access to all the windows and doors, upstairs included.
Your job is guaranteed for a year, as with all our work.
- Where
- Castletown (KW14)
- Region
- Highland
- Cover
- One year on every job
- Price
- A clear quote up front
- info@mrmastic.co.uk
- Updated
- 26 October 2026
More services for Castletown
How the visit works
There’s no need to move everything out before we come, only the area right around the joints. We protect the rest, and the job takes anything from a few hours to a full day, depending on how many windows for a typical job. Outdoor work around Castletown depends on the weather, as sealant needs a dry surface, so external jobs may need to move if the day turns wet. Indoor work goes ahead whatever the weather.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- Move anything stored near the joints
- Let us know if you’ve seen damp or leaks
Get a quote
For sand mastic in Castletown, email us at info@mrmastic.co.uk. Tell us what the problem is and where, and you’ll get a clear quote before work begins.
Advice
DIY versus a professional finish
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
Leave it or put it right?
Replacing sash windows is a big decision for a period home, and in listed buildings it may need consent. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. In an older home around Castletown, damp from a failed joint can get into timber and plaster.
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
What you get with us
- One-year guarantee on every job
- Neat joints and a tidy finish
- Old sealant always removed completely
- Homes, businesses and hotels
See our cost guide or our reviews.
Aftercare tips
A little care helps the new joints last. Our advice:
- Ask the planning authority about consent for listed or conservation-area homes
- Renew mastic before redecorating the windows
- Ask a joiner to look at soft timber first
- Avoid heavy scraping on the mastic joint
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
An open joint round the box lets weather through. Left, the gap tends to get bigger as more mastic falls out.
What sealant work cannot fix
It helps to know what we can’t do too:
- Sashes that need overhauling
- Decisions on consent for listed homes
- Putty and glazing repairs
If you’re not sure, just drop us a line at info@mrmastic.co.uk and we’ll give you a straight answer before you book.
Surfaces we seal
- Brick reveals
- Sash and case windows
- Stone surrounds
- Timber door frames
- Tenement windows
- Period & listed homes
What affects the cost of sand mastic
The price is agreed before any work begins. It’s based on:
- The number of rooms or windows
- Any mould that needs treating
- How easy the joints are to reach
- When we can work, for business premises
The cost reflects the work involved, not guesswork. That is why we ask about the job first and agree the price before starting.
Asking for a quote
When you contact us, these details help:
- If it’s domestic, commercial or a hotel
- Where the job is, and your postcode
- If someone has resealed it before
- Any access issues, like height or stairs
We quote each job on its own, so start by telling us what you need. Just email us at info@mrmastic.co.uk with the details.
Frames and glazing around Castletown
Castletown is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Sash and case windows are common in older Scottish homes, often pointed into the wall with traditional sand mastic.
In and around Castletown, as anywhere, good sand mastic starts with a clean, dry, properly prepared joint. For an older house near a landmark such as St Trothan's Church, the joint between an old wall and a newer frame is normally the first place rain gets in.
Castletown is about 5 miles east of Thurso, in Highland. Wherever you are in the KW14 postcode area, we can carry out sand mastic at your property. Across Highland, we cover 253 places, Castletown among them.
We cover every part of the KW14 postcode area for sand mastic. You will find streets such as Calder Square, Main Street and Traill Street, all of which we cover. Nearby, we also carry out sand mastic in Murkle (2 miles west), Dunnet (3 miles north-east), Brough (4 miles north), Bower (4 miles south-east) and Thurso (5 miles west). For island and remote addresses, a little more planning is needed, so let us know when you get in touch.
What’s near Castletown
Nearby you will also find Thurso Castle (4.4 miles west) and Dunbar Hospital (5.5 miles west). The countryside around Castletown includes St John's Loch.
How the job changes by surface
Period and listed homes
Period homes look their best with traditional materials.
Timber door frames
Round a period front door, sand mastic gives the right look.