Monuments with glass that new buildings are envious of
BENGglas is the solution for monumental buildings that want to be ready for the future without changing the appearance. Where HR++ and HR+++ glass is often too thick or too heavy, BENGglas is so thin that it simply fits into the existing frames. And: BENGglas insulates up to three times better than HR++ glass (U up to 0.40). This way, you maintain the original appearance and save significantly on your energy bill.
Does your building have that characteristic drawn glass with waviness? There is now a smart solution for that. With BENGglas combined with special monument glass, you retain the authentic look while still benefiting from today's insulation values.
- Fits into existing frames
- Maximum insulation (up to U=0.40)
- Also possible with light or strong waviness in the glass
- Color-neutral or extra clear vacuum glass
- U-value tested by IFT Rosenheim (2025)
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Find a certified installer
BENGglas has an extensive network of over 150 certified installers across Europe, specializing in vacuum glass installations. This way, you’re always assured of a professional close to home! Want to get the best deal easily? Fill out our quote form and receive three competitive offers from the three nearest BENGglas dealers in your area!
BENGglas: the first step towards sustainably protected heritage
In old monuments, you often find single glazing or old-fashioned double glazing in the window frames. Do you want better insulation? Then you quickly think of HR++ or HR+++ glass. But that is thick glass, which often means you also have to replace your window frames. And that often means a loss of the character of your building. Or worse: sometimes it's not allowed at all because it's protected heritage. In short: making it more sustainable seems difficult.
BENGglas has the solution for monuments!
With only 8.3 mm thickness, our vacuum glass always fits in your existing window frames. And the insulation? That goes much better: twice as good as HR+++ glass and even three times better than HR++! Do you currently have single glazing (U=5.8) or old double glazing (U=2.8)? Then you're making a giant leap forward.
You notice it immediately:
✓ A lower energy bill
✓ More comfort, less cold drafts, and significantly less noise from outside (-36 dB)
✓ Fits in the existing window frames
✓ Maximum insulation (up to U=0.40)
✓ Twice the lifespan of standard insulating glass, up to 50 years
This way, your monument not only remains beautiful but also future-proof!
Historical glass with an authentic character
Monument glass is that slightly wavy glass you see in beautiful old buildings. This hand-drawn glass creates those subtle distortions that make historical windows so unique. Do you want to maintain that authentic appearance during renovation? Then BENGglas Monu or BENGglas Monu Restover is your solution. This way, you get the best of both worlds!
Prefer no wavy surface for your monument?
Then choose BENGglas Extra Clear or BENGglas Single Coated!
BENGglas Monu with Restover or Monument glass?
At BENGglas, we understand that monument glass is sometimes desired. Therefore, we offer the option to choose BENGglas Monu Restover (heavily drawn) or BENGglas Monu (lightly drawn).
✓ Heavily drawn glass (BENGglas Monu Restover): specially suitable for homes built before 1930, where the glass has a more pronounced wave and thicker profile.
✓ Lightly drawn glass (BENGglas Monu): used in homes from 1930 onwards, with a more subtle, light wave.
Prefer glass without waves for a monument?
Then you can choose BENGglas Extra Clear or BENGglas Single Coated!
What you need to know before you choose BENGglas Monu Restover
BENGglas Monu Restover combines authentic appearance with maximum insulation — perfect for monumental buildings where strong waviness in the glass is desired or required.
Note a few important points before you choose:
- More fragile: the extra monumental counter pane is non-tempered glass and therefore more sensitive than other BENGglas types.
- Thicker: with a thickness of 13.06 mm, BENGglas Monu Restover does not always fit in existing frames — so checking is essential. BENGglas Monu, BENGglas Extra Clear, and BENGglas Single Coated are all 8.3 mm thick, so the chances of them fitting in your frames are much greater.
- Higher in price: due to the extra pane and special design, the price is higher than for BENGglas Monu, BENGglas Single Coated, or BENGglas Extra Clear.
- Heavier: BENGglas Monu Restover is heavier, which can lead to heavier (and more expensive) fittings and closures.
Do you want top insulation, but wavy/drawn glass is not necessary? Then BENGglas Extra Clear or Single Coated are excellent alternatives.
Everything in one convenient overview? Download our brochure
Frequently asked questions
What is the warranty period for monument glass?
At BENGglas, we think ahead. Thanks to the expected lifespan of no less than 50 years, we offer you up to 20 years warranty—that's twice as long as standard insulation glass.
What is covered by the warranty?
- 20 years warranty on BENGglas Extra Clear, BENGglas Single Coated, BENGglas Monu
- 5 years warranty on BENGglas Monu Restover
Our warranty covers the free replacement of your pane(s) if they lose their insulating function within the warranty period. This way, you can be sure that you're set for years.
Want to know more?
View the full warranty terms in ''documentation''.
How much subsidy do I get for monument glass in Belgium?
Do you live in Flanders? Then you can make use of the renovation grant when renovating your house or building. For replacing existing glass with BENG glass, you will receive no less than 16 euros per m²!
How much subsidy do I get for monument glass in the Netherlands?
Extra high subsidies for national monuments!
Thanks to the Investment Subsidy for Sustainable Energy and Energy Saving (ISDE), you receive an attractive compensation for making your home more sustainable with BENG glass:
✓ € 25 per m² for replacing glass with BENG glass (Notification code: KA18780)
✓ € 111 per m² if you also replace the window frames (Notification code: other)
✓ € 46 per m² for replacing glass with BENG glass in national monuments
+ Doubling of the amount with additional insulation measures, such as roof or floor insulation!
Are you unsure if your home is a national monument?
Visit RVO.nl for more information!
Are you an entrepreneur and want to make your business premises more sustainable?
With the energy investment deduction (EIA), you can benefit from a tax advantage that can amount to as much as 300 euros per m²! The investment must be at least 2,500 euros. Apply for the EIA subsidy within three months after installation via the eLoket of RVO.nl.
References
Are you curious about where vacuum glass is already being used? Check out our references and discover how BENGglas is applied in various projects – from monumental buildings and protected heritage sites to sustainable new constructions, canal houses, and sleek offices.
In this way, we help contribute to energy-efficient buildings with lower CO₂ emissions, pane by pane.
Town Hall of Veere chooses BENGglass
Historic heritage made sustainable with BENG glass in Herentals
Restoration with a future: Windesheim's church and sexton's house in new glass
