Best Time of Year to Replace Doors and Windows in the UK

1. Spring (March–May) — Often the Best All-Round Choice

Spring is widely considered the ideal season because:

• The weather is milder and more predictable

• Longer daylight hours help installations go quicker

• You avoid the peak summer rush

• Temperatures are comfortable, so your home won’t get too cold during installation

Verdict: ✔ Best balance of comfort, availability, and efficiency.

2. Early Autumn (September–October) — Another Excellent Window

Early autumn has similar benefits to spring:

• Still mild, usually dry

• Installers often have availability after the summer surge

• Great timing to improve insulation before winter

Verdict: ✔ Smart choice if you want to boost energy efficiency before colder months.

3. Summer (June–August) — Fast but Popular

Summer installations are quick because:

• Days are dry and long

• No heat loss issues during installation

• Ideal for large projects like bifold doors or full-house glazing

But keep in mind:

• It’s usually the busiest (and sometimes priciest) season

• You may need to book well in advance

Verdict: ✔ Very convenient, but busier and potentially more expensive.

4. Winter (November–February) — Possible, But Not Ideal

Many installers still operate year-round, but winter brings challenges:

• Cold air enters while old windows are removed

• Poor weather can delay jobs

• Materials can take longer to seal or cure

However, there are advantages:

• Installation companies often offer winter discounts

• You might get quicker booking dates

• Modern installers minimise heat loss by replacing one window at a time

Verdict: ✔ Good for deals, but least comfortable and most weather-dependent.

So, When Is the Best Time?

✔ Top choice: Spring or Early Autumn

✔ Most convenient for scheduling: Winter

✔ Fastest installations: Summer

If you’re aiming for:

• Comfort + ideal working conditions: Spring/Autumn

• Deals/discounts: Winter

• Fast, dry installs: Summer