Windows and doors rarely fail overnight. Most issues start small, then gradually get worse until your home feels colder, noisier, or less secure than it should.

Below are the most common window and door problems we see, what causes them, and how to tell when repair is no longer the best option.

Draughts and cold spots

If you can feel cold air around your windows or doors, something isn’t sealing correctly.

Common causes:

Worn or compressed seals
Frames that have moved slightly over time
Poor original installation
Older glazing that’s past its best

When replacement makes sense:
If draughts are coming from multiple windows or doors, replacement is often more cost-effective than chasing lots of small fixes.

Condensation between the glass

If you’re seeing moisture inside the double-glazed unit (not just on the room-side surface), the sealed unit has failed.

Why it happens:

Seal failure over time
Age-related breakdown of the unit
Temperature stress and movement

Sometimes the glass unit alone can be replaced, but if frames are ageing or several units have failed, full replacement is usually the better long-term option.

Stiff handles, locks or hinges

Windows and doors should open and close smoothly. If they don’t, it’s not just inconvenient, it can become a security issue.

Typical causes:

Misalignment over time
Worn locking mechanisms
Hinges dropping on heavier doors

If multiple components are failing or parts are no longer available, replacement can be the most practical solution.

Visible damage or warping

Cracks, bowing, or frames that look out of square usually point to deeper problems.

This can be caused by long-term weather exposure, ageing materials, or natural movement in the building. Once frames distort, seals no longer sit correctly, leading to draughts and heat loss.

Rising energy bills

Older windows and doors are a common source of heat loss in UK homes. If your heating is on more often but rooms still feel cold, your glazing could be a big factor.

Modern replacements offer improved insulation, tighter seals, and better overall thermal performance, helping your home stay warmer for longer.

Poor sound insulation

If outside noise feels louder than it should, your glazing may no longer be doing its job.

This is especially common with older double glazing or units where seals have failed. Modern glazing can significantly reduce road and neighbourhood noise.

A tired or outdated look

Even if everything still works, older windows and doors can make a home feel dated.

A new door or window upgrade can instantly improve kerb appeal while also boosting security and energy efficiency.

Repair or replace: how to decide

A repair may be suitable if:

Frames are in good condition
The issue is isolated
Parts are still available

Replacement is usually the better option if:

Problems are widespread
Units are older and underperforming
Security standards are outdated
You’re repeatedly paying for small fixes

Not sure what you need?

If you’re unsure whether repair or replacement is the right move, a proper assessment makes all the difference.

Tommy’s Windows can assess your windows or doors and give straightforward advice based on what’s best for your home.

If you’d like a quote or a chat, get in touch and we’ll point you in the right direction.