Storm Windows 101: A Portland Homeowner’s Guide

If your home has storm windows, you already know they’re not like a normal double-hung sash — and most window cleaning content in Portland barely mentions them, even though they’re common on the city’s older housing stock.

What Are Storm Windows, Really?

A storm window is a second, removable pane installed outside (or occasionally inside) your primary window, originally added for extra insulation and weather protection before modern double- and triple-pane glass became standard. If your home was built before the 1980s — especially a craftsman or Victorian in a neighborhood like Nob Hill or Irvington — there’s a real chance you still have original or vintage storm windows.

Why Storm Windows Are Genuinely Different to Clean

• They don’t tilt in the way a modern double-hung window does, so both panes need direct access — often meaning careful removal.
• Older wood-frame units can have worn hardware or delicate glazing that a rushed job risks damaging.
• Grime and condensation build up between the storm pane and the primary window — invisible from a standard cleaning pass on either surface alone.
• They need to go back exactly where they came from, properly seated, or you lose the insulation benefit they were installed for.

How to Tell If You Have Them

If your windows have a removable outer pane with separate hardware, clips, or a wood storm frame distinct from the interior window — especially on an older home — that’s a storm window setup. If you’re not sure, it’s worth asking whoever cleans your windows to check, since a lot of general cleaners either skip storm windows or charge extra without explaining why.

What This Means for Your Cleaning Schedule

Storm windows collect the same seasonal grime as any other Portland glass — rainy-season mineral film, spring pollen, moss on shaded exposures — but the two-pane structure means there’s more surface area and more places for it to hide. A twice-yearly schedule still applies, but the job itself takes longer and needs more care.