When Should I Change My Windows and Doors? Key Signs & Lifespan

One of the most common questions homeowners ask is: “When should I change my windows and doors?” The answer depends on the materials, maintenance, and how well they’ve been installed.

In this guide, we’ll look at the typical lifespan of windows and doors, the factors that affect it, and the key signs that it’s time to replace them.

The Average Lifespan of Windows and Doors

If you’re wondering when should I change my windows and doors, it helps to know how long each type normally lasts:

• uPVC windows and doors: 20–30 years

• Aluminium windows and doors: 30–40+ years

• Timber windows and doors: 25–35 years (longer if maintained)

• Composite doors: 25–30 years

These are averages — the actual life line of your windows and doors depends on factors like weather exposure, build quality, and upkeep.

What Can Affect the Lifespan of Windows and Doors?

Several things influence when you should change your windows and doors:

1. Material:

   • uPVC is low maintenance but can discolour over time.

   • Aluminium is the most durable, resisting rot, rust, and warping.

   • Timber can last decades if maintained, but is vulnerable to rot without care.

2. Weather exposure:
   Homes exposed to harsh sun, rain, or coastal air may see frames wear faster.

3. Quality of installation:
   Poorly fitted windows and doors will fail much sooner.

4. Maintenance:

   • Regular cleaning and lock lubrication extends lifespan.

   • Timber needs painting or staining every few years.

5. Glazing and seals:
   Failed double glazing (misting between panes) or perished rubber seals reduce both efficiency and lifespan.

When Should I Get My Windows and Doors Changed?

You should consider replacing your windows and doors when they:

• Reach the end of their lifespan (20–40 years depending on material).

• Fail to comply with modern Building Regulations.

• Show visible signs of damage or wear.

Even if they “still work,” outdated windows and doors could be costing you money through heat loss, draughts, and poor security.

How Do I Know If Mine Fail Modern Building Regulations?

If you’re asking when should I change my windows and doors to meet regulations, here’s what to check:

• Energy efficiency (Part L): Single glazing or old double glazing won’t meet today’s U-values. Signs: cold spots, condensation, high bills.

• Ventilation (Part F): Since 2022, most windows/doors need trickle vents. If yours don’t have them, they’re likely non-compliant.

• Security (Part Q): New units should be PAS 24 tested with multipoint locks. Old single locks don’t comply.

• Certification: If installed after 2002 without a FENSA or CERTASS certificate, they’re probably non-compliant.

In short: If your windows are single glazed, lack trickle vents, have old locks, or were fitted before 2002 without certification, it’s time to replace them.

Signs It’s Time to Change Your Windows and Doors

The clearest signs that your windows and doors are ready to be changed include:

1. Condensation or misting between panes – sealed unit failure.

2. Draughts or cold spots – poor sealing increasing heating bills.

3. Difficulty opening/closing – warped frames or worn hinges.

4. Visible rot, rust, or cracks – weakens structure and security.

5. Increased outside noise – poor insulation from old seals.

6. Rising energy bills – inefficient glass and frames.

7. Outdated locks – may not meet PAS 24 or insurance requirements.

8. Aged appearance – faded colours or dated styles.

Why Replacing Sooner Can Save You Money

Putting off replacement might seem like a saving, but outdated windows and doors:

• Drive up heating costs.

• Compromise security.

• Risk leaks, damp, or mould.

• Lower property value.

Investing in modern, energy-efficient units not only makes your home more comfortable and secure, but can also save money long-term.

FAQs on When Should I Change My Windows and Doors

How often should I replace windows and doors?
Most uPVC last 20–30 years, aluminium 30–40+, and composite or timber around 25–35 years depending on condition.

Do I need to replace all windows and doors at once?
No – you can replace them gradually, but upgrading together is often more cost-effective.

What is the average life line of a front door?
Composite and uPVC front doors last around 25 years, aluminium can exceed 40.

What are the biggest signs I need to change my windows and doors?
Misted glass, draughts, rot, security issues, or high energy bills are the main indicators.

Will new windows and doors add value to my home?
Yes – modern, compliant units improve efficiency, security, and curb appeal, all of which boost resale value.

In summary: If you’re asking “when should I change my windows and doors”, the answer depends on age, condition, and compliance. Most last 20–40 years, but signs like misted glazing, draughts, poor security, or lack of compliance with modern Building Regulations mean it’s time to replace them.