Windows in Burlington take lake wind, ice at the sill, and a short season for any repair that opens the outside of the wall. Old North End sash, Hill Section openings, and later units in the New North End do not share a size or a level of rot. Storms that fail trap moisture. Trim that needed attention before frost is now soft and painted into winter. Interior drafts can be discussed anytime. Exterior replacement wants the open weeks. Say which you need.
A rotten sill, a snapped cord, and a unit foamed into a crooked opening are different jobs. Look at the apron for the stain. Fog between panes is a dead seal. Sweat on a single pane may be cooking and a weak fan in a tight house, not a reason to replace the street front. A key that sinks into the sill means the wood is gone and the opening is carpentry. That carpentry is harder once the cold locks the outside work.
Bays leak at the joint with the main wall, and the wind off the lake finds that joint. Odd sizes are normal in the older neighborhoods. A window that is a way out has to keep working. Weights and pockets are worth saving if the wood is sound. Painted-shut sash on an alley side rot out of sight. Mention them. South End houses and hill houses do not see the same exposure. Name the face that fails.
If you only need a cord, a lock, or a storm that latches, winter is not a reason to wait. If you need sills, trim, and new frames, waiting until the ground is frozen pushes the job to the next open season while the wall stays wet. Say which list you have. Shutters and storms are part of the description. Do not call every cold pane a failed window.
Count the openings and name the rooms. Have the neighborhood and whether the work is inside or outside. Mention bays. A short list is enough to start. Call the number on this page.