LandVac vacuum glazing for sash windows in London is a modern glazing technology that delivers triple glazing performance in a slim unit. Whether you’re in a conservation area or just value period-accurate style with modern performance, this ultra-slim option is designed for you.
What is Vacuum Glazing?
Why Choose LandVac Vacuum Glazing for Sash Windows in London?
If you live in a Georgian, Victorian or Edwardian home, you already know the challenges. Traditional sash windows look beautiful, but they’re often single glazed and energy-inefficient. Double glazing? Too thick for original frames. And getting planning approval? That’s another headache.
That’s where LandVac vacuum glazing for sash windows in London stands out. It provides:
Exceptional energy efficiency (U-value as low as 0.4 W/m²K)
Powerful acoustic reduction (up to 39 dB)
Unchanged appearance from the street — perfect for conservation areas
How LandVac Vacuum Glazing Works
LandVac is a next-generation glazing solution made up of two panes of toughened glass, sealed with a 0.3 mm vacuum gap and reinforced with invisible micro-pillars. It’s this vacuum that stops heat transfer – achieving better insulation than even triple glazing, in a unit just 8.3 mm thick.
With a centre pane U-value of 0.4 W/m²K, 39 dB sound reduction, and a sleek profile that looks identical to single glazing, it’s no surprise LandVac is fast becoming the go-to choice for sash window upgrades in London.
Ultra-Slim Construction
Two panes of toughened glass are separated by a 0.3 mm vacuum cavity, supported by tiny invisible micro-pillars.
High Performance in Minimal Thickness
With a total thickness of just 8.3 mm, it fits easily into original sash frames without altering sightlines or proportions.
Durable & Long-Lasting
Unlike gas-filled double glazing, LandVac units don’t leak, fog up, or degrade. Each unit is backed by a 15-year warranty, and tested for even longer performance.
Why It’s Ideal for London Homes
Many of our customers live in properties subject to Article 4 Direction, where planning departments restrict what can be changed — especially on sash windows.
LandVac is ideal for:
Conservation area properties across London boroughs (Islington, Camden, Westminster, Kensington, Hackney…)
Listed buildings (subject to Listed Building Consent)
Sash window replacements where retaining original appearance is essentialProjects prioritising energy efficiency without compromising traditional design
Projects prioritising energy efficiency without compromising traditional design
Performance Comparison: LandVac vs Other Glazing
| Glazing Type | Thickness | Centre Pane U-Value | Noise Reduction | Appearance |
|---|---|---|---|---|
| Single Glazing | 3–4 mm | ~5.0 W/m²K | Poor | Authentic |
| Slim Double Glazing | 11–14 mm | ~1.8–2.2 W/m²K | Average | Bulky |
| LandVac Vacuum Glazing | 8.3 mm | 0.4 W/m²K | Up to 39 dB | Indistinguishable from single |
| Triple Glazing | 36–44 mm | 0.6–1.0 W/m²K | Good | Unsuitable for heritage frames |
Other Benefits of LandVac Vacuum Glazing
✅ Fully recyclable
✅ 15-year product warranty
✅ No gas leakage risk (unlike argon-filled units)
✅ Low-E coating for solar control
✅ Suitable for cold and hot climates
✅ Works seamlessly with new sash windows
Planning Permission? We’ve Got You Covered
LandVac has already been approved by planners in multiple London boroughs. Thanks to its discreet appearance and minimal visual impact, LandVac vacuum glazing for sash windows in London is one of the few modern solutions that planning officers consistently accept.
We’ve helped homeowners across Maida Vale, Hampstead, Notting Hill, Greenwich, Hackney and beyond to upgrade their sash windows using LandVac – and we know what planners will and won’t accept.
Our vacuum-glazed timber sash windows are often approved because they maintain traditional proportions and sightlines.
Need help with an application? We can prepare drawings, heritage statements, and supporting documents.
FAQs
How long does LandVac glazing last?
LandVac comes with a 15-year manufacturer warranty, but lab-tested performance suggests a much longer lifespan. Unlike double glazing, it doesn’t rely on inert gas, so there’s no risk of fogging or degradation over time.
Is it worth the extra cost?
Compared to traditional double glazing, yes – if you value lower bills, less noise, and peace of mind with planning. You’re effectively getting triple-glazing performance in a traditional frame.
How energy efficient is it?
LandVac achieves an ultra-low centre pane U-value of 0.4 W/m²K – dramatically outperforming standard double glazing. It’s one of the most energy-efficient glazing options available for sash windows.
What’s the lead time?
Lead times vary, but typically fall within 12–14 weeks for made-to-order timber sash windows with LandVac.
Why Choose Sash Window Shop?
We don’t just install sash windows – we specialise in them. All of our timber windows are made to order, with Accoya® or hardwood options, and we’ve spent years working with conservation officers and local planning departments.
We know how to get it right the first time, avoiding costly redesigns and rejections. And yes – we’ll tell you honestly if something isn’t worth the extra spend.
What Next?
Whether you’re replacing draughty originals or upgrading to something more efficient – we’re ready to help. We work across London, Hertfordshire, Essex, and the Home Counties.
Final Word
LandVac vacuum glazing isn’t just a technical upgrade – it’s a way to futureproof your home, reduce your bills, and keep your period windows looking exactly as they should.
If you’re based in London or the surrounding areas and want a sash window solution that actually works – let’s talk.
