Overview: Window Installers
Most window work is replacement: the old units come out of openings that already exist, and new ones go in. That is a different job from the new construction windows a builder nails to a bare frame, and the quotes are not comparable. Within replacement there are two routes. An insert drops a new unit inside the existing frame, which is quicker and cheaper and costs you a little glass area. A full-frame replacement strips back to the rough opening, which is the only honest answer when the frame or the sill underneath has rotted.
The glass carries most of the performance. Two panes with a coating and a gas fill between them is the normal specification; a warm-edge spacer around the perimeter is what stops the edges sweating. Frames are vinyl, wood, fiberglass or clad wood, and they differ in upkeep more than in insulation.
Ask who puts the inside back together. Trim, drywall returns, caulk and paint are often excluded and left to you. On older homes, ask how the crew handles paint disturbed during removal, because the answer tells you whether they work to the lead rules at all.
Use the state and city lists below to reach window companies in your area.
Frequently asked questions
Insert or full-frame replacement?
An insert keeps the existing frame and sill, disturbs almost nothing inside or out, and costs less. You lose a strip of glass all the way round. Full-frame goes back to the rough opening, lets the installer see and seal what is behind the trim, and is the only sound choice if the sill is soft or the frame is out of square. Ask which one each quote assumes.
What actually makes one window warmer than another?
The glass package, mostly. A low-emissivity coating reflects heat back where you want it, an inert gas fill slows conduction across the gap, and a warm-edge spacer keeps the perimeter from becoming a cold bridge. Frame material matters less than people expect. Fit matters more than either: a good unit with an unsealed gap around it will still feel cold and whistle in the wind.
Why is there mist inside the glass?
The seal around that sealed unit has failed, so moist air has got between the panes and no amount of cleaning will reach it. It is not condensation on the room side, which is a humidity problem. A failed unit usually means replacing the glass rather than the whole window, which is far cheaper. Check the warranty on the unit first, because glass cover often runs longer than labor cover.
Do bedroom windows have to open wide enough to climb out?
In most places, yes. Building codes set a minimum clear opening for bedrooms and finished basements so someone can get out and a firefighter can get in, with limits on how high the sill sits. It is easy to break that rule by accident when a large old window is replaced with a smaller or differently hinged unit. Raise it before you order, not after.
Who repairs the inside once the windows are in?
Ask, because this is the most common complaint about window jobs. Many quotes cover the unit, the exterior trim and the outside caulk, and stop there. Interior casing, drywall returns, paint and the disposal of the old units may all be extra. On an older home, removal also disturbs old paint, so ask how the crew contains and cleans that up.
