Na h-Eileanan Siar · Scotland
Window & door mastic in Stornoway, Na h-Eileanan Siar
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Stornoway. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Black, perished sealant on frames
- Hard, cracked sealant around windows
- Gaps left after new windows were fitted
Window mastic for homes and businesses in Stornoway
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. We seal one or both, depending on what’s needed. Typical jobs include cracked or shrunken mastic around the frame and draughty joints inside around the window, across aluminium frames, timber windows & doors and patio & French doors.
Mastic can only go onto a dry joint, so outside work in Stornoway depends on the weather. Let us know about access to every frame, including any upstairs.
There’s a 12-month guarantee on every job, large or small.
- Where
- Stornoway (HS1, HS2)
- Wider area
- Na h-Eileanan Siar
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Paint up to the joint, not over it
- Keep drainage slots and sill grooves clear
- Avoid blasting the frames with a pressure washer
- Keep timber frames painted
Keep the new mastic undisturbed while it cures, for as long as we advise. Keep jet washers away from the frames.
Look out for the warning signs: split or missing mastic, gaps, damp patches inside or black mould on the reveal. Any of these is worth a call.
The process
Most of a good job is in the preparation, so that is where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it normally takes a morning for a couple of windows and a door. In smaller Scottish places, parking is normally less of an issue than access and distance. Tell us how to find the property and how to reach the work.
- 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.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- Keep pets and children clear of the area while we work
- For business premises, tell us about site rules or sign-in
- Mention any parking rules near the property
Ask for a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.
Advice
When it is not the sealant
Some problems need a builder, plumber or other trade rather than us:
- A failed sealed unit that has misted up
- Draughts through the window seals rather than the frame
- Damp coming through the wall itself rather than the frame joint
If in doubt, email us at info@mrmastic.co.uk and we’ll say what we think before booking.
Where we work in Stornoway
- Timber windows & doors
- Window sills
- uPVC windows
- Composite doors
- Aluminium frames
- Patio & French doors
Places near Stornoway
What else we do in Stornoway
Leave it or put it right?
Redecorating is a good moment to renew the mastic. Fresh joints finish the job neatly, and it’s easier while the walls are being worked on anyway. Out of town in Scotland, exposed walls take a lot of weather, and once water gets behind a failed joint, damp in stone or harled walls is slow to dry out.
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first.
Why choose Mr Mastic in Stornoway
- Anti-fungal sanitary silicone in wet areas
- ARBOMaster approved applicator
- Colour picked to suit the job
- Domestic, commercial and hotel work
Take a look at what affects the cost or customer reviews.
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
For anyone letting property in or around Stornoway, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and photos by email help.
Common problems we fix in Stornoway
Timber windows bring their own problems. Old mastic gets painted over and cracks under the paint, and timber moves with moisture as well as temperature.
The problems people normally mention when they call include:
- Draughts coming in around windows and doors
- Cracked or shrunken mastic around the frame
- Rushed sealant from a window installation
- Rain getting in at the frame or under the sill
Around Stornoway, as everywhere, window mastic is only as good as the preparation behind it.
Comparing quotes
- How the colour is chosen
- What insurance they hold
- Whether the sealant suits the joint
- How long to leave it before use
Common questions in Stornoway
Does living near the coast affect window mastic in Stornoway?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
Can you do window mastic in Stornoway?
Yes. We work across all of Scotland, and Stornoway is part of that. Just email us at info@mrmastic.co.uk with a few details of the job.
Will new mastic stop draughts?
If the draught is coming in around the frame, yes. If it’s coming through the window seals, we’ll tell you.
Can you get sealant to suit coloured frames?
Yes, we choose a colour to suit the frame. Grey and black frames get grey or black sealant, and wood-effect frames generally suit brown.
Do you work for hotels and businesses?
Yes. Larger jobs can be planned room by room or area by area.
Is the new sealant paintable?
Silicone generally won’t take paint. Let us know beforehand, and we’ll use a paintable product where it suits.
Are you an approved applicator?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Is there any odour?
Sometimes, a little. It fades as the sealant cures.
Windows and doors in Stornoway
Stornoway is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on the mastic around window and door frames, especially on the side facing the sea. Island weather, with its wind and salt spray, is tough on the mastic around window and door frames.
For jobs in and around Stornoway, choosing the right material for each joint is as important as a tidy finish.
Stornoway (Gaelic: Steòrnabhagh) is in Na h-Eileanan Siar. Stornoway gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Stornoway is one of 87 towns and villages in Na h-Eileanan Siar we cover.
Our applicators cover all of the HS1 and HS2 postcode area for window mastic and the streets around it. Whether your property is on Barony Square, Bain Square and Grant Square or a nearby road, we can help. You will find Stornoway on the A857 and A859, which makes it straightforward to reach. Neighbouring places we cover for window mastic include Plasterfield (1 mile east), Laxdale (1 mile north), Sandwick (1 mile south-east), Steinis (1 mile east) and Newmarket (1 mile north). Stornoway is one of the larger places we cover in Na h-Eileanan Siar. Remote and island addresses need a little more planning, so tell us where you are when you ask for a quote.
Around Stornoway
Around Stornoway, our work takes us to homes and buildings near Neptune's Bar and the streets around them. A little further out are Western Isles Hospital (0.5 miles north) and Lewis Loom Centre (within half a mile south-west). For a walk, there’s Loch Àirigh na Lic.