Please find all the technical detail on our vacuum glazed windows and doors below. Vacuum glazing is a premium upgrade that can be built into any of our new timber products. Whether you are commissioning new sash windows, casement windows or timber doors, we can specify LandVac or FINEO as the glazing, so you get heritage looks and modern performance in one unit. It is equally suited to reglazing existing frames as part of a restoration.
Based in Kensington W8, we install vacuum glazing throughout the Royal Borough of Kensington and Chelsea and neighbouring boroughs including Westminster and Hammersmith and Fulham, across areas such as Kensington, Chelsea, Notting Hill, Holland Park and South Kensington.
A note on price: vacuum glazing sits at the premium end. It is an investment in the best available performance, longevity and heritage authenticity, and we will always set out the options honestly so you can decide what is right for your property.
Vacuum glazing is a highly efficient sealed unit. Like double glazing it uses two panes of glass, but instead of a gas or air gap the air is drawn out completely and the cavity is sealed. That vacuum is an exceptional insulator, so the gap can be tiny, around 0.3mm, which is why the whole unit sits close to the thickness of the original single glass.
For period and heritage windows that changes everything. You keep the slim sightlines and the original timber frames, and gain thermal performance that matches or beats triple glazing at a fraction of the thickness and weight. It is, in most cases, the option that satisfies both the homeowner and the conservation officer.
Look closely at a vacuum unit and you will see a neat grid of tiny dots. They are not a flaw. They are micro-spacers, and they are what makes the vacuum possible.
With the air removed from the cavity, the atmospheric pressure pressing on the outside of the panes is enormous. Left unsupported, the two panes would simply be forced together and the vacuum would collapse. The micro-spacers sit between the panes like a field of near-invisible props, holding them a fraction of a millimetre apart so the vacuum, and its insulating performance, stays intact.
The quality of a vacuum unit is largely in this detail. The best units use fewer, smaller and less visually distracting spacers, a neat edge seal, and a getter that keeps the vacuum stable for decades. It is why not all vacuum glass is the same, and why we specify carefully.
We work with the two leading vacuum glazing systems, and specify whichever suits your property, timescale and budget. Both give heritage sightlines and modern performance; the practical differences are lead time, glass type and configuration.
| FINEO (by AGC) | LandVac (by LandGlass) | |
|---|---|---|
| Slimmest unit | 7.7mm | 8.3mm |
| Centre-pane U-value | ~0.7 W/m²K | 0.4 to 0.49 W/m²K |
| Glass | Toughened / laminated by tier | Toughened safety glass as standard |
| Made in | Belgium | China |
| Lead time | Around 2 weeks | Around 10 to 16 weeks |
| Warranty | 20 years | 25-year accelerated ageing tested |
FINEO is the fastest and thinnest option; LandVac offers the lowest U-values, the best acoustic figures and dedicated security and hybrid tiers. Learn more from the manufacturers:
8.3mm · heritage
The conservation choice: slimmest sightlines, toughened as standard.
13.1mm · security
P1A laminated security in a slim profile, building-regs compliant.
25.1mm · hybrid
Vacuum unit plus a traditional cavity and extra pane, fully customisable.
FINEO offers a comparable range: Standard (7.7mm), Safety (14.9mm) and Hybrid (25.1mm). We will recommend the right unit for your windows.
Vacuum glazing is measured in whole-window U-values (lower is better). Typical improvements when reglazing with LandVac:
| Replacing | Frame | Before | After |
|---|---|---|---|
| Single glazing | Timber | 4.41 | 1.14 W/m²K |
| Single glazing | Steel | 5.46 | 1.88 W/m²K |
| Early double glazing | Timber | 2.26 | 1.01 W/m²K |
| Early double glazing | uPVC | 2.64 | 1.07 W/m²K |
Alongside the warmth: noticeably less noise, more daylight than triple glazing (because the unit is so thin), no condensation, and no change to the character of the window. Ideal in conservation areas and listed buildings, where standard double glazing is usually refused, and where much of our work across the Royal Borough of Kensington and Chelsea takes place.
Reglazing in a conservation area or listed building?
Every property surveyed in person. Serving Kensington, Chelsea and the surrounding boroughs, we will advise on the right system, the performance you can expect, and how it fits your windows and doors.
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