Stone openings vary in depth and shape far more than a standard brick or block wall. A frame measured or fitted to the wrong reveal lets in draughts, damp, and noise, whatever the specification of the glass inside it.
Stone-built homes across Scotland were built long before standard window sizes existed.
That’s true of sandstone tenements in Glasgow’s West End just as much as farmhouses in Perthshire and crofts on the coast.
Every opening is slightly different. The reveal depth in a solid stone wall runs deeper than anything a modern uPVC catalogue assumes.
Accurate measuring and careful fitting bring a stone home a level of warmth and quiet its original windows never had.
A rushed survey or a badly packed frame undermines even a good double glazed unit, and the draughts come straight back.
The Advanced Group has fitted double glazed windows into stone properties across Scotland since 1988, with a 15-year guarantee on frames, glass, and workmanship. Call our Glasgow team on 01355 271 223 or our Edinburgh team on 0131 370 0444 to book a free home survey.
Why fitting and measuring matter more in a Scottish stone-built home
A modern brick or block wall has a consistent reveal depth. A fitter working a new-build estate measures one opening and largely knows what the rest will be.
Stone walls don’t work that way. Every reveal was cut and dressed by hand, and no two openings in the same house are guaranteed to match.
Uneven reveals and non-standard openings
Solid stone walls in older Scottish properties often run 450mm to 600mm thick, compared to around 300mm for a modern cavity wall. That extra depth changes where the frame sits and how the glazing bead and rebate are cut.
It also affects how much of the reveal needs dressing or packing before the new unit goes in.
A surveyor who measures a stone opening like a standard brick opening will get the frame size wrong. The gap then ends up hidden behind trim rather than fixed properly.
Our surveyors measure every reveal individually and record the condition of the stonework before manufacture begins.
Why DIY or a rushed fit fails in stone
Supply-only and DIY window kits assume a square, standard-depth opening. Fit one into an out-of-true stone reveal and the frame sits proud. The seal never closes evenly, and cold air finds the gap within a season.
Draught proofing tape or a quick repair job might mask that gap for a season. Neither fixes a frame that was never packed to the reveal properly in the first place.
A poor fit in a stone home shows up as condensation on the pane, a whistling draught in high wind, or water around the frame. The cause is usually the frame itself, set against stone that was never perfectly flat to begin with.
Our fitters work the reveal by hand on every stone property.
They pack and seal to the actual shape of the opening rather than an assumed standard. Nothing gets covered up with trim to hide a bad measurement.
Stone-built homes across Scotland
Stone construction covers a wide range of Scottish housing stock.
Georgian and Victorian sandstone tenements and villas sit across Glasgow, Edinburgh, and Dundee, many with oak lintels above the original window openings.
Whinstone and rubble-built farmhouses are common in rural Perthshire, Ayrshire, and the Borders, alongside older stone cottages extended and altered over generations. Many carry a newer extension with standard-size openings sitting alongside the original ones.
A Victorian sandstone villa and a 200-year-old farm cottage share the same core challenge: thick, hand-built walls and window openings that were never standardised.
What differs is the window style each carries, and that’s what shapes which replacement makes sense.
Bespoke uPVC windows and double glazing options for stone homes
Sash windows
Sandstone tenements and villas across Glasgow and Edinburgh were built almost universally with vertical sliding sash windows.
For many owners, keeping that appearance matters as much as the performance upgrade.
Our uPVC sliding sash windows replicate the sliding movement using spring balances instead of the original weights and cords.
Original timber sashes in stone properties have usually shrunk, warped, or rotted at the sill after decades of Scottish weather. That’s exactly where draughts get in.
A properly measured double glazed sash unit achieves 1.4 W/m²K as standard (‘A’ rated) at the very minimum.
It seals against the frame the way the original weights and cords never did.
Casement windows
Side-hung and top-hung casement windows are more common than sashes in rural stone cottages and farmhouses.
Our double glazed casement windows are manufactured to the exact dimensions of each opening.
That matters more here than on a standard property, because stone reveal depths rarely match from room to room.
Stone mullion windows
Older stone properties, particularly farmhouses and cottages built before the 19th century, sometimes carry stone mullion windows.
These are openings divided by a solid stone or timber upright rather than a window frame. They need specialist handling, because the mullion itself is often original stonework that shouldn’t be disturbed.
Where a mullion window sits in a non-listed property, we can usually fit a bespoke double glazed unit either side of the stone upright. This keeps the mullion in place and matches the frame to each individual light.
Energy efficiency and thermal performance in stone homes
Energy efficient double glazing makes the biggest single difference to how a stone home performs in winter, more than loft or wall insulation alone.
U-values and heat loss
A single pane of glass has a U-value of around 5.0 W/m²K.
Stone itself has decent thermal mass and holds heat reasonably well once warmed, but that thermal mass works slowly.
It does nothing to stop a single-glazed window losing heat in real time. In an old stone wall, the glazing is usually the weakest barrier to that loss.
Our standard double glazed units achieve 1.4 W/m²K, reducing heat loss through the glass by around 70% compared to single glazing. Moving from 5.0 down to 1.4 is a huge improvement, and it helps reduce energy bills from the first winter.
There’s an option to reduce that further to 1.2 W/m²K.
For homeowners who want to go further still, our innovative triple glazing brings the whole window down to 0.8 W/m²K.
In a stone farmhouse that difference shows up as a warmer house through the coldest months. Thick stone walls hold warmth once a room is up to temperature.
A draughty original window loses that heat faster than the walls can replace it.
Condensation and comfort
Cold, thin single glazing is where condensation forms first in a stone property.
Left long enough, it leaves timber sills rotten and damages the surrounding plaster.
With our latest double glazing uPVC frames, the inner pane stays close enough to room temperature that condensation largely stops forming.
Better sealing also cuts the cold air that pools at floor level near old, draughty frames. That’s often the real reason a room with the heating on still feels cold in a stone house.
Planning permission and building regulations
For non-listed stone homes outside a conservation area, replacing windows is permitted development in Scotland.
No planning application is needed, provided the new windows are similar in style to the originals.
Conservation areas require prior notification before front-facing changes, which involves a short application and a 28-day review period with your local authority.
In practice, uPVC replacement windows are usually accepted where they match the proportions of what’s there already.
In the event that uPVC isn’t accepted, we can always guide you towards a reputable secondary glazing company to ensure your home still benefits from an energy efficient upgrade.
How installation works in a stone home
- Free home survey – our surveyor measures every opening individually, checks reveal depth and stonework condition, and confirms your listed or conservation area status.
- Manufacture to measure – each window is built to the exact dimensions recorded during the survey, not a standard size.
- Careful removal – old frames come out one at a time, with the stone reveal cleared and inspected before the new unit goes in.
- Fitting and sealing – the frame is packed, levelled, and sealed to the actual shape of the reveal, with the rebate and bead finished to sit flush against the stonework.
- Finish and clean-up – surrounds are dressed to match, and all old frames and waste are removed before we leave.
A typical stone property with 8 to 10 windows takes two to three days. That’s slightly longer than a standard home, because of the extra care each stone reveal needs.
Why choose The Advanced Group for your stone home
Experience with stone construction
We’ve measured and fitted double glazing into stone properties across Scotland since 1988. Our surveyors regularly deal with 500mm-plus reveals, off-square openings cut by hand, and original stone mullions that need working around rather than replaced.
Our surveyor gives an honest assessment of what your property needs and what’s realistic under listed or conservation rules.
Guarantee, reviews, and showrooms
Every installation carries a 15-year guarantee on frames, glass, and workmanship.
Our uPVC is manufactured from 80% recycled and renewable material through our Camden Ireland partnership.
We’re rated 9.6 out of 10 on Trustpilot from over 500 verified reviews, and more than half our work comes through direct recommendations.
Visit our Glasgow or Edinburgh showroom to see the profiles and try the mechanisms before you commit to anything.
Double glazing for stone homes: your questions answered
Is it worth replacing 25-year-old double glazing in a stone home?
Usually, yes. Sealed units from the 1990s and early 2000s often have failed seals by now, and their performance has dropped closer to single glazing. Our current units at 1.4 W/m²K perform significantly better.
What are stone mullion windows?
Stone mullion windows are openings divided by a solid stone or timber upright rather than a window frame. They’re most common in farmhouses and cottages built before the 19th century.
Should I double glaze or fit secondary glazing?
If your property isn’t listed and sits outside a conservation area, full double glazing replacement is almost always the better long-term option. If it is listed, or consent for replacement isn’t likely, secondary glazing is an effective alternative.
Sash window restoration or replacement, which is better?
Restoration keeps the original timber but rarely solves draughts on its own. The timber has usually shrunk away from the frame over decades, and sanding or repainting it doesn’t close that gap back up. Replacement with a properly measured uPVC sash window keeps the same look and movement while closing that gap for good. For most stone properties, it’s the more cost-effective route.
Book your free stone home window survey with The Advanced Group
Call our Glasgow showroom on 01355 271 223 or our Edinburgh showroom on 0131 370 0444. You can also request a quote online and we’ll arrange a free home visit at a time that suits you.
Our surveyor measures every opening individually, checks your listed and conservation area status, and provides a full written quote with no obligation to proceed. We cover Glasgow, Edinburgh, Fife, Falkirk, Ayr, Paisley, Livingston, Dunfermline, and Perth.
Every window we fit into a stone property carries the same 15-year guarantee as the rest of our range.
