Last Updated on March 17, 2025

Sash Replacement vs Window Replacement: Which To Choose?

When it comes to improving your home’s energy efficiency, appearance, and overall value, one of the most significant investments you can make is replacing your windows. However, for many homeowners and landlords in the UK, the decision often boils down to a crucial choice: sash replacement vs window replacement. 

While both options serve similar functions—replacing old, inefficient windows with newer, more effective alternatives can affect your decision.

In this in-depth guide, we’ll compare sash window replacement and full window replacement, discussing the costs, installation process, benefits, and other factors to consider before making your decision. 

Whether you’re looking to maintain the charm of traditional sash windows or opt for a more modern solution, we’ve got you covered.

Sash Window Replacement vs Full Window Replacement: A Quick Comparison

Prices are approximate and may vary based on location, size, and materials used.

Sash Window Replacement vs Full Window Replacement: Key Differences

What is Sash Window Replacement?

Sash window replacement involves replacing the individual sashes (the moveable part of the window) while keeping the frame intact. This option allows you to retain the character of your property, particularly in listed buildings or homes with historical significance. 

Sash windows are typically associated with traditional, period-style homes, but they’re also popular in modern homes that want to maintain a vintage appeal.

There are several types of sash windows to consider when replacing your sashes. Traditional Georgian sash windows feature six-over-six panes, while Victorian designs often have two-over-two configurations. 

Edwardian sash windows, on the other hand, combine large lower panes with smaller upper sections, offering a balance of elegance and practicality. Choosing the right type ensures your home maintains its architectural authenticity.

Key Features of Sash Window Replacement:

Pros of Sash Window Replacement:

Signs That You Need a Sash Window Replacement

For homeowners with traditional sash windows, full window replacement isn’t always necessary. Instead, replacing the sashes (movable panels) can resolve issues while preserving the original frame. Consider sash replacement if:

For homeowners opting for sash replacement, the choice often comes down to uPVC or wooden sash windows. Both materials have their pros and cons, and the best option depends on your priorities. Read our guide on uPVC sash windows vs wooden sash windows to learn more.

Sash Window Replacement Process

If you opt for sash replacement, the process is less invasive than full window replacement but still involves some disruption. Here’s a general outline of what to expect:

The level of disruption is minimal compared to full window replacement. However, homeowners should expect some dust, noise, and temporary inaccessibility to affected rooms during installation.

What is Full Window Replacement?

Full window replacement involves replacing both the frame and the sash, often with a more modern, energy-efficient alternative. This option is ideal for homeowners looking to update the look of their property while improving insulation, security, and energy efficiency.

Key Features of Full Window Replacement:

Variety of Designs: You can choose from a wide range of window styles, including casement, tilt-and-turn, or sliding windows.

Pros of Full Window Replacement:

Signs That You Need a Window Replacement

Over time, windows deteriorate due to weather exposure, wear and tear, and outdated materials. Here are common indicators that it might be time for a full window replacement:

Full Window Replacement Process

Full window replacement involves removing both the frame and sash, making it a more comprehensive upgrade. Here’s a general breakdown of the process:

Since full window replacement requires removing the entire unit, it causes more disruption than sash replacement. Homeowners should expect:

• Noise and dust during frame removal.
• Temporary room inaccessibility, especially if multiple windows are replaced.
• Potential interior or exterior touch-ups needed around the new frame.

Cost Comparison: Sash Replacement vs Full Window Replacement

In general, the cost of new windows can vary based on location, window size, material choice, and any special requirements for your home.

Here’s a breakdown of typical costs for both options. Keep in mind that these are averages.

As you can see, the cost of sash window replacement is generally lower than full window replacement. However, the latter offers more options for energy efficiency and long-term savings. 

Which Option is Right for You?

When considering sash replacement vs window replacement, several factors come into play. Here are some of the key considerations to help you make the right decision:

Request a Free Quote for New Window Replacement

Ready to Upgrade Your Home’s Windows? Get a Free Quote Today!

Whether you’re considering sash window replacement or a full window replacement, our team is here to help you make the best choice for your home. We provide expert advice, transparent pricing, and high-quality installation services. 

Request a free quote for new window replacement today and discover how easy it is to enhance your property’s appearance and energy efficiency.

FAQs

Should I replace the window or sash?

It depends on the condition of your existing window. If the frame is in good shape and only the sash (the moving part of the window) is damaged or inefficient, a sash replacement is a cost-effective solution. However, if the window frame is deteriorating, drafty, or inefficient, a full window replacement may be the better long-term investment.

Is it cheaper to repair or replace sash windows?

In most cases, repairing a sash window is cheaper than a full replacement, especially if the frame is still in good condition. Simple repairs like replacing cords, fixing broken glass, or adding weatherproofing can extend the life of your sash windows at a lower cost. However, if the damage is extensive, replacement may be more cost-effective in the long run.

How much does it cost to replace a window sash?

The cost of replacing a window sash varies depending on the size, material, and type of window. On average, sash replacement costs range from £100 to £400 per sash, while custom or high-end materials may be more expensive. If professional installation is required, labor costs may add £50 to £150 per window.

Do you need scaffolding to replace sash windows?

Scaffolding is not always necessary for sash window replacement, especially for ground-floor windows. However, for upper-floor windows, scaffolding may be required for safety and ease of installation. The need for scaffolding depends on factors like window height, accessibility, and local regulations.