The cost of window restoration Willows may vary depending on several factors like the kind of window, the damage, and if there are any parts which don’t need to be replaced. A glass replacement can cost around $2 to $3 per square foot for a single pane glass. It can cost around $15 up to $25 per square foot if you include glazier points, window putty, and caulking. If you hire a handyman to do the job, you may pay $50 to $100 to replace the glass for a single pane, 12 square feet window. The number of windows can also affect the cost of the window Willows restoration project. The glazing of the window can also add to the expense of the restoration. A double pane or insulated window may cost higher than a standard glass window. The type of damage a window incurred has the greatest impact on the cost. If the frame of the windows has to be restored as well, you may expect to pay from $900 to $1,500.