What's actually causing this
Window panes break from impact, stress fractures from temperature cycling, or settling of the window frame. Single-pane windows in older homes are the most common repair candidate.
What you'll need
Links go to Amazon search results — buy the part that matches your specific model. Uncle AI earns a small commission on purchases, at no extra cost to you.
- Work gloves (cut-resistant) Shop →
- Safety glasses Shop →
- Putty knife Shop →
- Glazing compound Shop →
- Glazing points Shop →
Step-by-step fix
-
1
Remove the broken glass
Wearing thick gloves, remove the largest pieces first. Score remaining shards with a glass cutter and snap them out. Dispose in a puncture-proof container.
-
2
Remove old glazing compound
Use a heat gun or hair dryer to soften old glazing putty, then scrape it away with a putty knife. Remove all glazing points with pliers.
-
3
Measure and order new glass
Measure the opening and subtract 1/8 inch from each dimension to allow for expansion. Take these measurements to a hardware store for cutting.
-
4
Bed and set the new glass
Apply a thin layer of glazing compound in the channel as a bed. Set the glass and press it firmly. Insert glazing points every 6 inches to hold the glass in place.
-
5
Apply glazing and paint
Roll glazing compound into a rope and press it against the glass at a 45-degree angle using a putty knife. Smooth it flush. Let dry 7 days before painting.
Door and window contractors in Philadelphia typically charge $95–165/hr. Window replacement averages $300–800 per window, while entry doors run $800–2,500 installed.
Permits and inspections requirements vary by Philadelphia. Check with your local building department before starting.
Brick and masonry dominant. Pointing and repointing frequent. Wood siding on older homes. Slate roofing on historic homes. Wood rot concern in freeze-thaw climate.
Standard door and window maintenance applies in Philadelphia's climate.
DIY in Philadelphia: Philadelphia's strict codes, historic preservation, and licensing requirements restrict DIY repairs. Most homeowners hire licensed professionals. Permits are required and inspections are strict.
- The window is double-pane (foggy between panes means the seal is gone).
- The glass is tempered, laminated, or has embedded wires.
- The window frame is rotted — the glass replacement won't hold.
- The window is larger than 3 square feet — large glass is difficult to transport and install safely.
Let Uncle AI diagnose it first.
Describe the problem. Uncle AI asks the right questions and tells you exactly what's broken — and whether you should fix it yourself or call someone in Philadelphia.
Start free diagnosis →