What is the difference between single and double hung windows?

When choosing new windows for your home, style and appearance are important factors to consider. However, your top priority is likely to be functionality.

Single-hung and double-hung windows are two popular window styles, particularly in traditional and period-inspired properties. At first glance, they can look very similar, but there are a few key differences:

How they operate
How they're maintained
How they perform in everyday use

Understanding these differences can help you decide which option is best suited to your home, budget, and lifestyle. This guide tells you everything you need to know.

What is a hung window?

Hung windows are windows with vertically sliding sashes.

The sash is the framed section of the window that holds the glass.

Unlike casement windows, which open outward on hinges, hung windows slide up and down within the frame.

Aesthetically, they are commonly associated with traditional British homes – particularly Georgian and Victorian properties. They're also a popular choice for heritage-influenced renovations, as well as modern homes with twists of classic styling.

Both single- and double-hung windows share this vertical sliding design, but it's the way the sashes move that sets them apart.

What is a single-hung window?

A single-hung window has one fixed sash and one movable sash.

Typically, the bottom sash slides vertically, while the top sash remains fixed in place. To open the window, you raise the lower sash.

This design is relatively simple and has been used for many years in traditional window systems.

What is a double-hung window?

A double-hung window has two movable sashes. Both can slide independently.

This allows for greater flexibility in ventilation, airflow control and cleaning access.

Double-hung windows are often considered a more versatile version of the traditional sash window.

The key differences

Sash movement

The biggest difference between single- and double-hung windows is the sash movement. With a single-hung window, only one sash moves. With a double-hung window, both sashes move.

This feature offers one of the key advantages of double-hung windows: improved ventilation. Since both sashes can open, it means warm air can escape through the top opening while cooler air enters through the bottom. This can help improve airflow throughout the room.

Single-hung windows still provide ventilation, but airflow is more limited because only the bottom section opens.

For homeowners prioritising airflow and flexibility, double-hung windows offer an advantage.

Cleaning and maintenance

Cleaning is another area where double-hung windows are often preferred.

Many modern double-hung systems include tilt-inward sashes and easy-clean mechanisms, allowing both sides of the glass to be cleaned from within the property.

With single-hung windows, cleaning the external upper pane can sometimes be more of a hassle, particularly on upper floors.

That said, maintenance requirements for both styles are generally low when the windows use modern materials, such as uPVC or aluminium.

Appearance and design

Visually, single- and double-hung windows are very similar. Both can complement traditional and period-inspired homes.

The choice is often more about functionality than appearance. However, double-hung windows may create a slightly more balanced aesthetic when both sashes are proportioned equally.

What about energy efficiency?

Energy efficiency depends more on the frame materials, glazing quality and installation standards than on whether the window is single- or double-hung.

Modern hung windows can include double or triple glazing, weather seals and energy-efficient frames.

When professionally installed, both styles can provide excellent energy performance.

Security features

Today, both single- and double-hung windows can offer strong security features.

These could include:

Multi-point locking systems
Reinforced frames
Toughened or laminated glazing
Restrictors for controlled opening

And remember: the quality of installation is just as important as the window design itself.

Which option is more affordable?

Single-hung windows are often a little less expensive than double-hung windows. That's because they have fewer moving parts and a simpler mechanism, which in turn can reduce their manufacturing costs.

Double-hung windows tend to cost more due to their additional, more complex functionality.

However, the difference can still vary depending on frame material, glazing specifications, the size of the window and overall design choices.

Which style is best for your home?

The right option depends on your priorities and the type of property you have. Single-hung windows may suit homeowners who want:

A simpler window design
A more budget-friendly option
Traditional styling
Lower maintenance requirements

They can be a practical choice for rooms where maximum ventilation flexibility is less important.

Meanwhile, double-hung windows are ideal for homeowners looking for:

Better airflow control
Easier cleaning access
Greater versatility
Enhanced functionality

Materials and customisation options

Both single- and double-hung windows are available in a range of materials.

uPVC

Great for:

Affordability
Low maintenance
Energy efficiency

Aluminium

Great for:

Slim sightlines
Modern appearance
Durability

Timber

Great for:

Period properties
Traditional aesthetics
Character and authenticity

Many of these can also be customised with different colours and finishes, decorative glazing bars, hardware styles and heritage details.

Professional installation with Calder Windows

Even the highest-quality windows will only perform properly if they're installed correctly.

With Calder Windows, you can rely on professional installation that ensures smooth sash operation, as well as proper sealing, energy efficiency and long-term durability.

Our experienced team are also on hand to help you choose the most suitable style to suit your property and budget.

While single- and double-hung windows share a similar appearance, the way they operate creates important differences in ventilation, cleaning access and overall functionality.

We help homeowners choose window styles that combine practicality, energy efficiency and lasting visual appeal. So, whether the time is right for you to renovate your period property, or you're thinking about upgrading your existing windows, we can help. We're here to help you find the right solution for your home and install it to the highest standard.

Are you looking for sliding sash windows in Yorkshire? Don't hesitate to get in touch with Calder Windows to chat about your options or request a free quote.

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