Hinged Secondary Glazing: The Go-To Solution for Casement Windows

Not every window in London slides up and down. If you live in a property with casement windows: those lovely hinged panes that swing outwards on a vertical hinge: you might have felt a bit left out of the secondary glazing conversation. Sash windows tend to steal the spotlight, but casement windows have their own set of challenges. And frankly, they deserve their own set of solutions.

At Secondary Glazing Specialist, we see casement windows in all kinds of properties, from traditional cottages to 1930s semi-detached homes. These windows are beautiful, but they can also be terrible at keeping out noise and cold. The good news? Hinged secondary glazing is specifically designed to solve these problems while respecting the original design of your home.

In this guide, we will explore why hinged panels are the go-to solution for casement windows, how they compare to sliders, and what to look for if you are considering making this upgrade.

What is Hinged Secondary Glazing?

If your primary window opens on a hinge, it makes sense that your secondary glazing should too. Hinged secondary glazing consists of an internal frame fitted with one or more glass panels that open inward on a vertical hinge.

The key here is the word “inward.” While your original casement window opens outward to let in air, the secondary glazing opens inward for easy access to that primary window. This means you can still ventilate the room, clean the outside of your original glass, and maintain your locks and latches without any hassle.

Unlike sliders, which move along a track, hinged panels pivot on a central axis. This makes them perfect for smaller or irregularly-shaped openings where sliding panels would be impractical.

When to Choose Hinged Over Sliders

The question we get asked most often is: “Should I go for a slider or a hinged panel?” The answer usually depends on the size and shape of your window.

Hinged Panels are Best For:

• Smaller Windows: If your window is relatively narrow, a sliding panel can feel cramped. A hinged panel gives you full access to the entire opening with a single swing.
• Frequent Access: If you open your windows regularly for ventilation, a hinged panel is often quicker and easier to operate.
• Arched or Shaped Windows: Sliders require a straight track. If your window has an arch, a curve, or an unusual shape, hinged panels can be custom-made to fit.

Sliders are Best For:

• Very Wide Openings: If your window is over a meter wide, a hinged panel can become heavy and unwieldy. In these cases, a horizontal slider is usually the better choice.
• Matching Sash Windows: If you have vertical sliding sash windows, a vertical slider secondary glazing unit is designed to mimic their movement perfectly.

For traditional casement windows in a period property, hinged panels almost always win on both aesthetics and practicality.

Soundproofing with Hinged Panels

One of the most common reasons people look for soundproof secondary glazing is because they live near a busy road, a train line, or a flight path. Casement windows, especially older timber ones, are notoriously bad at blocking low-frequency noise like traffic rumble.

Hinged secondary glazing can dramatically improve this. When fitted with 10.8mm acoustic laminate glass, a hinged unit can reduce external noise by up to 50 decibels. That is the difference between hearing the street and hearing almost nothing at all. For the full science behind this glass type, see our guide on why 10.8mm acoustic laminate is the gold standard.

The key to acoustic performance is the air gap. By positioning the hinged secondary panel around 100mm away from your primary window, you create a large buffer zone that sound waves struggle to cross. This is why secondary glazing often outperforms standard double glazing for noise reduction. For a deeper comparison, check out secondary glazing vs double glazing for traffic noise.

Thermal Insulation: Stopping the Drafts

Casement windows often have a weak point: the seal around the frame. Over time, timber frames shrink and swell, creating gaps that let in cold air. Even if the window closes “properly,” you might still feel a draft on a windy night.

Hinged secondary glazing creates a completely independent seal. Our frames feature high-quality compression seals that close tightly against the outer frame, blocking drafts entirely. This additional layer of insulation can reduce heat loss through the window by over 60%, making a noticeable difference to your energy bills.

For homeowners in older properties, this is often the most cost-effective way to improve thermal performance without replacing the original windows. For a broader look at energy efficiency in heritage homes, see our guide on insulating a listed building without planning permission.

Multi-Panel Options for Larger Windows

Not all casement windows are single panes. Many properties have windows with two, three, or even four casement panels side-by-side. In these situations, we can create a secondary glazing frame with multiple hinged panels that mirror the layout of your original window.

Each panel opens independently, giving you precise control over ventilation and access. The meeting stiles (the vertical bars where two panels meet) are kept as slim as possible to maintain a clean aesthetic.

Security Benefits

While the primary reason for installing secondary glazing is usually noise or thermal performance, there is a significant security benefit too.

Hinged panels can be fitted with multi-point locking mechanisms. When the panel is closed and locked, it creates an additional physical barrier that an intruder would have to break through. Furthermore, if you opt for laminated glass, the glass itself is extremely difficult to smash. Even if struck with force, it holds together rather than shattering, buying precious time and often deterring would-be burglars altogether.

Aesthetics: Keeping it Discreet

A common worry is that secondary glazing will look “bolted on” or ruin the character of the room. We understand that concern, especially if you have invested in a beautiful period property.

Our hinged frames are made from slimline aluminium, powder-coated in your choice of over 200 RAL colors. Most customers opt for a white or heritage cream finish to match their existing woodwork. When closed, the secondary glazing is barely noticeable. In fact, visitors often don’t even realize it’s there until you point it out.

For listed buildings or conservation areas, this discretion is essential. Because secondary glazing is an internal addition that doesn’t change the external appearance, it usually doesn’t require planning permission. For more on this, see our article on the Listed Building Loophole.

Maintenance and Cleaning

One practical advantage of hinged panels is how easy they are to maintain. Because the panel swings inward, you have immediate access to both the inside of the secondary glass and the outside of your primary window. No ladders, no squeegee on a pole, just simple wipe-down access.

The hinges themselves are designed for longevity. We use stainless steel hardware that won’t rust or seize, even in the damp British climate. A quick spray of silicone lubricant once a year is all they need to stay smooth.

Conclusion: Is Hinged Secondary Glazing Right for You?

If you have traditional casement windows and you’re looking for a way to improve noise insulation, thermal efficiency, and security without altering the external look of your home, hinged secondary glazing is an excellent choice.

It offers:

• Full Access: Easy inward opening for ventilation and cleaning.
• Superior Soundproofing: Especially when combined with 10.8mm acoustic laminate glass.
• Thermal Efficiency: Compression seals that block drafts and slash heat loss.
• Security: Multi-point locks and laminated glass options.
• Aesthetic Discretion: Slim frames colour-matched to your woodwork.

At Secondary Glazing Specialist, we have fitted hinged secondary glazing in properties ranging from listed Georgian townhouses to 1950s bungalows. Every installation is bespoke, measured to the millimeter, and designed to complement the character of your home.

Ready to explore your options? Get in touch with our team today, or browse our guides on vertical sliders for sash windows and horizontal sliders for wide windows to see which style suits each room in your home.