Double-Hung windows vs casement windows
James Elston

James Elston

Published March 16, 2025

Last Updated on March 17, 2025

Casement vs Double-Hung Windows: Pros, Cons, & Which One to Choose

When choosing new windows for your home or property, selecting the right style is crucial for energy efficiency, security, and aesthetics. Among the most popular choices in the UK are casement windows and double-hung windows.

Each type offers unique advantages, but which one is best suited to your needs?

In this guide, we’ll compare casement and double-hung windows, covering key factors such as security, ventilation, cost, energy efficiency, and maintenance. 

Whether you’re a homeowner, landlord, or property developer, this guide will help you make an informed decision.

Casement vs Double-Hung Windows: A Detailed Comparison

FeatureCasement WindowsDouble-Hung Windows
SecurityMulti-point locks offer superior securityStandard locks, can be less secure
VentilationFull opening allows maximum airflowCan be opened from the top or bottom for controlled airflow
DraughtsSeals tightly when closed, preventing air leaksCan develop slight air gaps over time
Energy EfficiencyHigh – tight seals reduce heat lossModerate – potential for minor air leakage
Light & VisibilityUnobstructed glass maximises natural lightHorizontal sash may slightly block views
Ease of UseEasy crank mechanismRequires manual sliding, can be stiff over time
MaintenanceRequires occasional lubrication of hingesSashes may need realignment or replacement
Best forModern and contemporary homesTraditional and period properties
CostGenerally more expensive due to hardwareMore affordable, but can require more maintenance

Casement vs Double-Hung Windows: Key Differences

How Do Casement Windows Work?

Casement windows are hinged at the side and open outward like a door, typically operated using a crank handle or lever mechanism. They offer unobstructed views and superior ventilation compared to other window types.

Key Features of Casement Windows

  • Opening mechanism: Hinged at the side and swings outward
  • Operation: Crank handle or push-open system
  • Security: Multi-point locking system for enhanced safety
  • Ventilation: Excellent airflow control
  • Energy efficiency: Tight seals reduce heat loss and draughts

Pros and Cons Casement Windows

Pros
  • Excellent energy efficiency
  • Unobstructed views
  • Strong security features
  • Maximises ventilation
Cons
  • Can obstruct pathways when open
  • More expensive than double-hung windows

How Do Double-Hung Windows Work?

Double-hung windows consist of two vertically sliding sashes, allowing both the top and bottom sections to open independently. This design is commonly found in traditional homes and offers versatile ventilation options.

Key Features of Double-Hung Windows

  • Opening mechanism: Two sliding sashes moving vertically
  • Operation: Lift-and-slide system with counterweights or springs
  • Security: Standard locks but can be upgraded with additional security measures
  • Ventilation: Both top and bottom openings allow flexible airflow
  • Energy efficiency: Good insulation but may have minor air leaks over time

Pros and Cons of Double-Hung Windows

Pros
  • Classic and traditional aesthetic
  • Flexible ventilation
  • Easy to install secondary locks
  • Generally cheaper than casement windows
Cons
  • Less energy-efficient due to potential air leaks
  • More maintenance required for sliding mechanisms

Materials

Both window types come in various materials, each with different levels of durability, energy efficiency, and cost.

1. uPVC Windows

  • Casement: Low maintenance, energy-efficient, cost-effective
  • Double-hung: Affordable but may develop sliding issues over time

2. Timber Windows

  • Casement: Ideal for traditional homes but requires upkeep
  • Double-hung: Great for period properties, but can warp over time

3. Aluminium Windows

  • Casement: Sleek, modern, highly durable, but more expensive
  • Double-hung: Less common but available in premium designs

Security

Security is a major concern for UK homeowners.

  • Casement windows: Multi-point locks make them one of the most secure window types.
  • Double-hung windows: Standard locks can be bypassed more easily, but security can be improved with secondary locks.

Winner: Casement windows due to their superior locking mechanisms.

Ventilation

  • Casement windows: Open fully to direct fresh air inside.
  • Double-hung windows: Allow controlled ventilation by opening either the top or bottom sash.

Winner: Casement windows provide maximum airflow, but double-hung windows offer flexible ventilation.

Energy Efficiency

  • Casement windows seal tightly when closed, minimising heat loss and draughts.
  • Double-hung windows, over time, may allow small air leaks due to sash movement.

Winner: Casement windows for better energy efficiency.

Which Window Style Suits Your Home?

  • Casement windows: Ideal for modern homes, energy-conscious homeowners, and those prioritising security.
  • Double-hung windows: Best for traditional houses, Victorian or Georgian properties, and listed buildings.

Costs and Installation

The cost of new windows depends on size, material, glazing options and installation complexity. Below, we’ll compare the average prices of casement and double-hung windows.

Window TypeAverage Cost (per window)Installation Time
Casement Windows£300 – £1,2001 – 2 hours
Double-Hung Windows£250 – £9001 – 3 hours

In general, the cost of casement windows tend to be more expensive than double-hung windows, primarily due to their more complex opening mechanism and improved energy efficiency. 

While double-hung windows are often more affordable upfront, casement windows can offer better insulation, potentially leading to long-term energy savings.

Maintenance

When choosing between casement and double-hung windows, it’s important to consider maintenance requirements to ensure longevity and smooth operation.

  • Casement windows: These require periodic lubrication of the hinges and crank mechanisms to prevent stiffness or difficulty in opening. The seals and locking system should also be checked regularly for wear and tear.
  • Double-hung windows: Since these windows have moving sashes, they may need occasional realignment to prevent sticking. Dust and debris can build up in the tracks, requiring frequent cleaning to maintain smooth operation. Over time, the sash cords or balance springs may also need replacing.

Winner: Casement windows typically require less maintenance, but proper care ensures both window types remain functional for years.

Lifespan

The lifespan of your windows depends on material, usage, and maintenance.

  • Casement windows: Generally last between 30 to 50 years, particularly when made from uPVC or aluminium. Timber casement windows require regular maintenance to prevent rot and may have a slightly shorter lifespan.
  • Double-hung windows: Typically last 20 to 40 years. Since they have more moving parts (sliding sashes, counterweights, springs), they may experience wear and tear sooner than casement windows. High-quality aluminium or uPVC double-hung windows can extend lifespan with proper care.

Winner: Casement windows tend to last longer due to their simpler design and fewer moving parts.

How to Choose Between Casement and Double-Hung Windows

When deciding on casement vs double-hung windows, consider:

  • Security Needs – If security is a priority, casement windows are the better option.
  • Energy Efficiency – Casement windows provide a tighter seal.
  • Home Style – Double-hung windows suit period homes, while casement windows fit modern properties.
  • Ventilation Preferences – Double-hung windows allow controlled airflow; casement windows offer full ventilation.
  • Budget – Double-hung windows are usually more affordable but may need more maintenance over time.

Comparing Casement Windows to Other Styles

Choosing between casement and double-hung windows is just one part of the decision-making process. If you’re considering other window styles, understanding how casement windows compare to different options can help you make the best choice for your home. Check out these detailed comparisons:

  • Flush windows vs. casement windows – While casement windows protrude outward when opened, flush windows sit flat against the frame, offering a more streamlined look.
  • Casement vs. sash windows – Traditional sash windows slide vertically, providing a different aesthetic and airflow pattern compared to casement windows, which open outward on a hinge.
  • French windows vs. casement windows – French windows function similarly to casement windows but are designed as a pair, often without a center mullion, creating a wider opening.
  • Casement vs. fixed windows – Fixed windows don’t open at all, making them a great option for maximising light and insulation but lacking in ventilation. 
  • Casement vs. sliding windows – Sliding windows move horizontally along a track, offering a space-saving alternative to casement windows, which require clearance to swing open.
  • Awning window vs. casement window – Awning windows open from the bottom, providing better protection from rain while still allowing airflow. 
  • Casement windows vs. tilt-and-turn windows – Tilt-and-turn windows offer dual functionality, tilting inward for ventilation or swinging open like a casement window. This versatility makes them a strong competitor to traditional casement designs.

Upgrade Your Home with High-Quality Windows – Get a Free Quote Today!

Choosing the right windows is a crucial investment in your home’s security, comfort, and efficiency. Whether you prefer casement windows for their modern appeal and superior insulation or double-hung windows for their traditional charm and ventilation flexibility, our expert team is here to help.

Request a free, no-obligation quote today!

FAQs

Which window is better, casement or double-hung?

The best window type depends on your needs. Casement windows offer superior energy efficiency, security, and ventilation, making them ideal for modern homes. Double-hung windows provide flexible airflow, a classic aesthetic, and are great for traditional or period properties. 

If security and energy efficiency are top priorities, casement windows are better. If you want versatile ventilation and a timeless look, double-hung windows may be the right choice.

Are casement windows out of style?

No, casement windows are not out of style. In fact, they are one of the most popular window choices for modern and energy-efficient homes. Their sleek, minimalist design complements contemporary architecture, and their airtight seal makes them ideal for sustainable, eco-friendly homes. 

With advancements in customisation and materials, casement windows can also be tailored to suit traditional properties.

Do double-hung windows add value?

Yes, double-hung windows can add value to a home, especially in traditional and period properties. Their classic design appeals to buyers looking for authentic character. 

High-quality double-hung windows with energy-efficient glazing and durable materials can improve curb appeal and energy performance, making a property more attractive to potential buyers.

James Elston

James Elston

Boiler Expert

James Elston is the top boiler replacement and heating expert at Eco Happy. He has over 20 years of experience in the industry, focusing on Gas Safe boiler installations and offering home-heating and energy-saving solutions to homeowners across the UK. From sourcing the most energy-efficient combi boiler to providing specialist heating advice, James ensures that Eco Happy maintains the highest standards and best customer service.

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