Box-Type Windows:

A Rediscovered Classic – Why They're Back in Style?

Box-type windows have graced stately buildings for centuries, shaped the charm of historic city centers, and are considered architectural heritage. Once the standard, they were gradually replaced by modern insulated glass windows. Today, however, box windows are making a real comeback. Why? And what makes this window system so fascinating – not just for heritage enthusiasts but for anyone interested in stylish, sustainable construction?

What Exactly Is a Box Window?

A box window (also known as a double window) consists of two sashes placed one behind the other, separated by an air gap. Usually, one sash opens inward, the other outward – a setup that has stood the test of time for centuries. The space between the two levels is usually between 6 and 15 cm.

This design has a lot to offer: the air gap acts as a natural insulator against heat loss and noise, while the two independent sash levels ensure exceptional durability. Box windows are typically made of high-quality wood, often with elaborate profiles, decorative glazing, or divided light.

A Look Back: From Commonplace to Rarity

Until well into the 20th century, box windows were standard throughout Central Europe. Only with advances in glass manufacturing and the rise of insulated glazing in the 1960s did single-sash windows with double glazing become the new norm.

Many box windows were replaced during the modernization boom of the 1970s and 80s, when energy upgrades often meant ripping out the old and installing the new. In the process, much of the historic character and architectural charm was lost.

But in recent years, attitudes have shifted. Box windows are in demand again – and for good reasons.

Why Are Box Windows Making a Comeback?

Excellent Insulation – No High-Tech Required

Thanks to their double construction with an air gap, modern box windows offer top thermal performance – sometimes even outperforming standard insulated glass windows. When combined with triple glazing on the inner sash, they can achieve passive house levels of efficiency.

Their design also reduces condensation: the inner surface stays warmer, helping to prevent mold growth.

Quiet Living in Busy Cities

In noisy areas like city centers or on busy streets, box windows show their strength. The large air space and decoupled sash layers provide outstanding sound insulation – up to 48 dB, which is about as quiet as a whisper.

Essential for Heritage Buildings – and Lovers of Style

In protected buildings, box windows are often required by preservation laws. And rightfully so – they maintain the building’s historical character, yet can still be equipped with modern technology, from traditional hardware to handcrafted glass.

Sustainable and Long-Lasting

Box windows are typically made of solid wood – a renewable, CO₂-binding material. With regular care, such as repainting and checking seals, they can easily last 80 to 100 years. Unlike many modern window systems, box windows can be repaired instead of replaced.

Endless Design Possibilities

Whether painted white, left natural, fitted with muntins or bold color accents – box windows give you full design freedom. A cool bonus: the interior and exterior sashes can be styled differently, allowing for a bright, warm feel inside and a bold façade presence outside.

Classic Looks, Modern Core

Today’s box windows combine timeless aesthetics with advanced features: hidden seals, energy-efficient glazing, security fittings, and slim profiles make them suitable for both historic renovations and new builds.

At Nobelwerk, we build custom box windows tailored precisely to your home and your style. You get a window solution that combines character, comfort, and sustainability – traditionally beautiful, technically state-of-the-art.

Back to the Future

Box windows are more than a nostalgic throwback. They’re a clever, eco-friendly, and durable solution that fits perfectly in today’s world. Want to build or renovate with intention – and without compromising on aesthetics? Then box windows are for you.

Whether in a historic renovation or as a standout feature in a new build, box windows are making a comeback – and you can be part of it.

Looking for handcrafted quality with real style?

Get in touch – our team at Nobelwerk will help you create your perfect window solution.

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