Editor’s note: this article is being reconciled against the original published version — see docs/CONTENT-ISSUES.md.
Measuring the opening, not the old window
Older openings are rarely square, and an old window can hide how far out of true its frame has drifted. A professional replacement is field-measured to the opening — width, height, diagonal — so the new unit is ordered to fit the space it is going into.
Setting it plumb, square and sealed
The crew removes the old unit, checks the sill and framing, sets the new window level and square, shims it so it is supported without being racked, and insulates and air-seals the gap around it. A window that is forced into a twisted opening will not operate right and will not seal.
Safety details that are easy to miss
Egress sizing in bedrooms and finished basements, tempered glass where code requires it near doors and floors, secure locking hardware that actually engages — these are decisions made during a proper installation, not afterthoughts.
The walkthrough
Before the crew leaves, every window is opened, closed and locked, the site is cleaned, and the old units and debris go with the truck. Window Inserts backs the installation with a one-year labor warranty on top of the manufacturer's product warranty.
By The Window Inserts team. Published March 24, 2026.