What this covers
Storm windows add a second glazed layer over existing windows, which is the practical way to make original single-pane sash perform closer to modern units without losing them. Exterior storms are aluminum or wood frames screwed to the outside casing with weep holes at the sill; many have sliding glass and screen panels for the seasons. Interior storms press or magnet into the inside casing and are nearly invisible from the street. The installer measures each opening, since old windows vary, orders or builds the panels, sets them square and tight, and seals the edges while leaving the weeps open so condensation can drain.
When to call
- Original wood windows worth keeping that leak air and cold.
- A historic district where replacing windows is restricted.
- Street noise or drafts in a room you want quieter and warmer.
What to expect
- MeasureEvery opening is measured individually and exterior or interior storms chosen.
- Order or buildPanels are made to size in the chosen color, with glass and screen inserts.
- InstallFrames are set square, fastened to the casing or fitted inside, and sealed at the edges.
- CheckOperation and weeps are checked, and you see how each storm comes off for cleaning.
Get a certified company
Look up a certified company by ZIP code. Every company's license, insurance and trades are verified before it is listed, and placement is never paid.
Questions people ask
Are storm windows worth it compared to replacement?
A good storm over a sound original window approaches a double-glazed unit's performance with far less disruption, and the old windows stay. Replacement wins when the originals are rotted or beyond repair.
Why do storms have weep holes?
Moisture collects between the storm and the window. Weeps let it drain and the space breathe; sealing them shut leads to peeling paint and rot on the sill.
Interior or exterior?
Exterior storms protect the old window from weather and are the traditional choice. Interior storms suit historic exteriors and upper floors that are hard to reach.
Related: Window replacement · Storm door installation · Window glass repair · All siding, windows and doors
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