Question 1

Is secondary glazing a good option for listed buildings?

Accepted Answer

Yes — secondary glazing is one of the most listed-building-friendly thermal upgrades available. Because it sits behind your existing window and doesn't alter the external appearance, it's typically acceptable in conservation areas and listed buildings. It can reduce heat loss by up to 65% and external noise by up to 80%.

Question 2

What exactly is secondary glazing?

Accepted Answer

Secondary glazing is a discreet, independent window system fitted to the room side of your existing sash & case windows. It creates an insulating air gap between the original glass and the secondary panel, dramatically improving thermal and acoustic performance — all without altering or removing the original window.

Question 3

How effective is secondary glazing at reducing noise?

Accepted Answer

Secondary glazing is one of the most effective noise-reduction solutions available. The air gap between the original window and the secondary panel can reduce external noise by up to 80% (approximately 45 dB). It's particularly effective on busy Edinburgh streets, near pubs and restaurants, or properties close to flight paths — often outperforming replacement double glazing for sound insulation.

Question 4

How much heat does secondary glazing save?

Accepted Answer

Secondary glazing can reduce heat loss through windows by up to 65%. The trapped air gap acts as an insulating buffer, and when combined with low-emissivity glass the performance improves further. Many customers report a noticeable difference in room temperature and a measurable reduction in heating bills within the first winter.

Question 5

Will secondary glazing cause condensation?

Accepted Answer

When properly fitted with adequate ventilation, secondary glazing should not cause condensation problems. In fact, it often reduces condensation on the primary window by keeping the inner glass surface warmer. We ensure each installation includes appropriate ventilation — typically through discreet trickle vents or by ensuring the existing window's ventilation is maintained.

Question 6

Can I still open my original sash windows with secondary glazing fitted?

Accepted Answer

Yes — our secondary glazing systems are designed to be easily opened, removed or slid aside so you retain full access to your original sash windows for ventilation and cleaning. We offer vertical sliding, horizontal sliding, hinged and lift-out panel options depending on the window size and your preferences.

Question 7

Is secondary glazing visible from inside the room?

Accepted Answer

Modern secondary glazing is designed to be as discreet as possible. Slim aluminium or timber frames sit close to the reveal and are painted to match your interior. Most visitors won't notice it's there — and from outside the building, the original windows look completely untouched.

Question 8

How does secondary glazing compare to replacement double glazing?

Accepted Answer

Both are excellent solutions but suit different situations. Replacement double glazing offers the best all-round thermal performance and a completely fresh window system. Secondary glazing is ideal when you want to preserve original windows (especially in listed buildings), need superior noise reduction, or want a lower-cost thermal upgrade. Secondary glazing is also non-destructive and reversible, which appeals to many homeowners and is favoured by conservation officers.

Question 9

How long does secondary glazing installation take?

Accepted Answer

Installation is quick and minimally disruptive. A typical window takes 1–2 hours. Most rooms can be completed in a single day, and there's no scaffolding, no external work, and no mess. We survey, manufacture to measure, and install — usually within 2–4 weeks of your order.

Question 10

How much does secondary glazing cost?

Accepted Answer

Secondary glazing is typically 40–60% less expensive than full replacement double glazing, making it a very cost-effective thermal and acoustic upgrade. Exact pricing depends on window size, glass specification and frame type. We provide free, no-obligation estimates — you can request one online or book a site survey.

Question 11

Does secondary glazing improve security?

Accepted Answer

Yes — secondary glazing adds a second barrier that makes forced entry significantly more difficult. Our systems use toughened or laminated glass options and secure locking mechanisms. For ground-floor and basement flats in Edinburgh, this is a meaningful security upgrade on top of the thermal and acoustic benefits.

Question 12

Can secondary glazing be removed later without damage?

Accepted Answer

Yes — secondary glazing is a fully reversible installation. The frames are fixed to the timber reveal or sub-frame, not to the original window. If you ever decide to remove it (for example, if you later opt for replacement double glazing), the original window is left completely intact with only minor screw holes that are easily filled.

Secondary Glazing for Sash & Case Windows

What Is Secondary Glazing?

Up to 65% Less Heat Loss

Up to 80% Less External Noise

Perfect for Listed Buildings & Conservation Areas

Discreet, Operable, Maintenance-Free

Quick to Install. Built to Last.

Quieter, warmer rooms — without altering your original windows

Quieter Rooms

Warmer Homes

Listed-Building Safe

40–60% Cheaper

What's included with every installation

Common Questions