Extraglaze Secondary Glazing

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Secondary glazing designed to enhance comfort while preserving your building’s character

Owners of listed and period properties face a unique challenge: improving warmth, comfort, and energy efficiency without altering the original windows that define the building. Extraglaze secondary glazing is designed specifically for this environment — discreet, reversible, and trusted by homeowners and Conservation Officers alike.

At a glance

• Near‑invisible, frameless insulation panels
• Reversible and conservation‑friendly
• Approved by Conservation Officers
• Significant warmth and condensation improvements
• Protects original windows in a “museum‑cased” environment
• Ideal for Grade I, II* and II listed buildings

Why listed-property owners choose Extraglaze

From our independent Feefo reviews we know that Extraglaze is one of the highest‑rated secondary glazing solutions in the UK. Homeowners in Grade II and conservation‑area properties repeatedly highlight three things:

• Near‑invisible appearance that preserves the look of original sash and casement windows
• Dramatic improvements in warmth and comfort, even in the coldest rooms
• Significant reduction in condensation, especially on single‑glazed sashes.

Many customers have told us that their installations were approved by Conservation Officers, giving reassurance that Extraglaze meets heritage expectations for minimal visual impact and reversibility.

“They were immediately approved by the Conservation Officer and have led to a noticeable improvement in warmth…”
— Verified Feefo review, Grade II Victorian home

This combination of heritage sensitivity, proven performance, and exceptional customer satisfaction makes Extraglaze a standout choice for listed buildings.

Designed for heritage: discreet, reversible, respectful

Listed‑building owners often worry that secondary glazing will look bulky or modern. Extraglaze is engineered to avoid exactly that.

• The ultra‑slim, frameless insulation panels sit close to the existing window and blend into the background
• Reversible installation protects the original fabric of the building
• No structural changes are required, making it suitable for Grade I, II*, and II properties
• Custom shapes accommodate arches, curves, bays, and irregular period features.

Customers frequently describe the panels as “almost invisible” once installed — a key reason Conservation Officers respond positively.

Why Conservation Officers approve Extraglaze

Conservation Officers typically look for four things:

• Reversibility
• Minimal visual impact
• Protection of original fabric
• Is it seen from outside? (With Extraglaze’s frameless design, the answer is no).

Extraglaze aligns with all four.

“…nothing does us more proud than receiving some approving looks or blatant praise from a local Conservation Officer.”

Combined with verified customer reviews confirming explicit approval, you can confidently state that Extraglaze is a conservation‑friendly solution.

Independent reviews: real results in real listed homes

Across hundreds of Feefo reviews, customers consistently highlight:

• “Rooms are much warmer”
• “Condensation dramatically reduced”
• “Almost invisible once fitted”
• “Beautifully made and very high quality”
• “Easy to install with clear instructions”
• “Excellent customer service from start to finish”.

These are not marketing claims — they are independent, verified experiences from people living in the same kinds of homes as your prospective customers.

Performance that respects your building

Extraglaze improves comfort without compromising heritage value:

• Thermal insulation reduces heat loss through single glazing
• Acoustic insulation softens traffic noise and urban sound
• Condensation control protects timber frames and reduces mould risk
• Draught elimination makes rooms feel warmer even before the heating comes on.

Your original windows also become “museum‑cased”. They are protected from condensation, black mould, and long‑term deterioration. Because the air inside the cavity is always warmer than outside, the original frames remain in a gentle, continuous drying‑out mode — ideal for preserving historic timber.

For many listed‑property owners, this is the only acceptable way to improve energy efficiency without altering original windows.

Perfect for Grade I, II*, and II listed buildings

Because Extraglaze is reversible and visually discreet, it is widely accepted as a sympathetic upgrade for:

• Georgian townhouses
• Victorian terraces
• Edwardian villas
• Timber‑framed cottages
• Historic farmhouses
• Converted mills, schools, and chapels.

Where double glazing is prohibited, Extraglaze provides a compliant, conservation‑friendly alternative.

A respectful installation process

Whether fitted by you or by a professional:

• No mess, no disruption
• No changes to the original window
• No drilling into historic frames
• Panels can be removed for cleaning or ventilation (no tools required).

This is especially valued in homes with delicate joinery or original shutters.

A trusted choice for heritage homes

Extraglaze has earned its reputation not through claims, but through consistent results and independent customer feedback. For listed-property owners, the reassurance is clear:

• It preserves the building’s character
• It improves comfort dramatically
• It aligns with conservation principles
• It has real‑world Conservation Officer approval
• It is backed by exceptional customer satisfaction.

Nic Irvine, co-founder of Extraglaze, was a guest speaker at a conference consisting primarily of Conservation Officers.

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