You've got a window that's driving you crazy. It's cloudy. It's drafty. It won't open. It looks terrible.

You're staring at it, trying to decide what to do. Clean it? Repair it? Replace the whole thing?

This is one of the most common dilemmas homeowners and business owners face. And without good information, it's easy to make the wrong call.

Let me walk you through a simple framework. By the end, you'll know exactly what action each of your window problems needs.

When to Just Clean

This is the easiest and cheapest category. Your window is structurally sound. The problem is just... dirty.

You just need to clean if:

The glass looks hazy or spotted, but your finger comes away clean when you wipe it.
There's a film on the glass that smears but eventually comes off.
The frames and tracks are dirty but not damaged.
The window operates smoothly—it's just not clear.

The Fix:

This is a straightforward job. For ground-floor windows, get yourself a proper squeegee, a scrubber, and a good cleaning solution. For higher windows, a telescopic pole lets you clean safely from the ground.

If the build-up is heavy or you don't have the time, professional window cleaners can have your windows looking brand new in a fraction of the time it would take you.

When to call a pro for cleaning:

You have hard water stains that won't budge with standard cleaning.
Your windows are on the second floor or higher.
You want a pure water, chemical-free clean.
You just don't have the time or inclination to do it yourself.

When to Repair

Your window has a specific, fixable problem. The glass and frame are basically sound, but a component has failed.

You should consider repair if:

The window won't stay open. This is usually a broken balance spring or sash cord. A repair specialist can replace these internal components without removing the whole window.
The window is stuck or hard to operate. If cleaning and lubricating the tracks doesn't solve it, there may be a mechanical issue with the hardware. Locks, handles, and hinges can all be replaced.
There's a draft. New weatherstripping or re-caulking often solves this. If it doesn't, the repair may be more complex, but it's usually still less expensive than replacement.
There's minor frame damage. A small area of rot on a wooden frame can sometimes be cut out and repaired rather than replacing the entire window.
The glass has a chip or crack. If the damage is small and not in a structural area, it can sometimes be repaired with specialist resin, avoiding the cost of full glass replacement.

The Fix:

Repairs are best handled by professionals. While some repairs are DIY-friendly (weatherstripping, lubricating tracks), most involve working inside the frame, handling glass, or dealing with tensioned springs—all of which carry risks.

A professional repair service can often fix the issue on the spot with the right parts and expertise.

When to call a pro for repair:

You're dealing with internal components like springs or balances.
You're working with glass.
The repair requires special tools.
You've tried basic fixes and the problem persists.

When to Replace

This is the big decision. Replacement is expensive and disruptive, but sometimes it's the only sensible choice.

You should replace if:

The glass seal has failed. Fog or condensation between the panes means the insulating unit has failed. No repair can fix this—the sealed unit needs to be replaced.
The frame is significantly damaged. If the frame is rotten, warped, or corroded beyond repair, replacement is the only option. Structural integrity matters for safety and energy efficiency.
The glass is deeply etched. If hard water stains or other damage have permanently etched into the glass surface, no amount of cleaning or polishing will fully restore it.
Your windows are single-glazed. Upgrading to double or triple glazing is one of the most cost-effective energy improvements you can make. The savings on heating and cooling often pay for the investment over time.
Your windows are difficult or dangerous to operate. If windows are so old that they're a safety risk, it's time for new ones.
You're renovating anyway. If you're already doing major work on your property, replacement makes sense as part of a larger project.

The Fix:

Replacement is a job for licensed professionals. Proper installation affects everything from energy efficiency to water resistance to security. A poorly installed window can cost you more in energy bills and repairs than you saved on installation.

The Simple Decision Tree

Still unsure? Follow this logic:

Is the glass cloudy between the panes? Replace.
Is the frame rotten or warped? Replace.
Is the window stuck but the frame is sound? Repair or clean.
Is the window just dirty? Clean.
Is there a draft you can feel? Repair (weatherstripping/caulking).
Is the window hard to operate but not broken? Clean and lubricate.
Are you unsure? Get a professional assessment.

The Smart Approach

The worst thing you can do is ignore a window problem. Small issues become big issues. A draft becomes rot. A stuck window becomes a broken one. A dirty window becomes etched glass.

Clean what you can. Repair what you can. Replace what you must. But don't do nothing.

Need help deciding what your windows need? Explore professional-grade repair and window cleaning supplies for DIY-friendly projects, or book a professional assessment for the tougher decisions.