Last Updated on April 14, 2025

How Long Does It Take to Replace Windows?

If you’re planning a window upgrade, it’s natural to wonder: how long does it take to replace windows? Whether you’re a homeowner improving energy efficiency, a landlord maintaining rental standards, or a commercial property owner, understanding the window replacement timeline helps you plan with confidence.

In this expert guide, we break down every factor that affects installation times, from property type to the number of windows being replaced — and what you can do to speed things up. Plus, we’ll explain how to get a free quote and what new windows might cost you in the UK.

How Long Does It Take to Replace Windows in the UK?

On average, replacing a single window takes around 1.5 to 2 hours, depending on the window type, size, accessibility, and the condition of the existing frames. For an entire house (e.g. 8–10 windows), you’re typically looking at 1 to 2 days for a professional team to complete the job.

Typical Timeframes:

Expert insight: Planning for a full window replacement? Ask your installer if they’ll deploy multiple fitters — this can cut down on project duration significantly.

Factors That Influence How Long Window Replacement Takes

Understanding these variables helps you plan and avoid surprises:

1. Window Type & Size

Larger or custom-designed windows, such as bay windows, sash windows, or tilt and turn windows, often take longer due to additional components and trims.

2. Material of Window Frames

• uPVC windows are quick to install and lightweight.
  
• Aluminium or timber windows may require more time due to weight or bespoke fitting.
  

3. Number of Fitters

A two-person team will work faster than a solo installer, especially on upper floors or with heavy glazing.

4. Accessibility

If your windows are hard to reach or require scaffolding (common in commercial buildings or older townhouses), it may add time.

5. Condition of Existing Frames

Rotten timber frames or poorly fitted older windows may require remedial work, such as frame realignment, masonry repair, or damp treatment, before the new units can be installed.

Do You Need to Be Home During the Installation?

For residential properties, yes — at least at the start. You’ll need to provide access, discuss any preferences with the installer, and be present for the handover. For longer projects, you can usually come and go.

For commercial properties or tenanted buildings, prior scheduling with tenants or property managers is essential.

Curious About the Cost of New Windows?

The time it takes is one thing — but what about the cost?

Costs vary depending on the number of windows, style, and glazing type. To help you budget properly, we’ve created a detailed guide breaking down the cost of new windows in the UK, including average prices for casement, sash, bay, and triple-glazed options.

Check out our full guide to new window costs

If you’re serious about upgrading, it’s worth understanding how much you might expect to invest — and how quickly those costs can be offset by improved energy efficiency and lower heating bills.

How to Speed Up the Window Replacement Process

• Choose an experienced installer: They’ll work faster and minimise disruption.
  
• Get a survey done in advance: This helps flag any unexpected challenges.
  
• Opt for straightforward window styles: Avoid complex customisations if time is a factor.
  
• Clear access: Move furniture, take down curtains, and clear the exterior if possible.

When Is the Best Time of Year to Replace Windows?

Installations can happen year-round, but spring and early autumn are often best for avoiding weather-related delays. If you want your home winter-ready with new energy-efficient windows, it’s smart to plan a few months in advance.

Planning a Replacement? Start with a Free Quote

Getting an accurate timeline starts with a free assessment. Whether you’re replacing one window or all of them, our team will assess your needs and provide a custom quote — no obligation.

We understand that cost is just as important as timing. That’s why our service not only delivers competitive pricing, but also fast turnaround times with minimal disruption.

Request your free window replacement quote today.