Painted-shut windows are common in older NYC apartments. Work slowly and stop if the sash, glass or frame starts taking the force.

Repeated coats of paint can bridge the seams between a window sash and frame until the window feels sealed. Before trying to free it, check for cracked glass, damaged sash cords, loose stops, security hardware, window guards or building restrictions that could change the job.

You’ll Need

  • A paint-opening tool or sharp scoring tool used carefully
  • A stiff putty knife
  • A small pry tool if appropriate
  • A block of scrap wood to protect finished surfaces
  • A rubber mallet for very light tapping

Step 1: Inspect and Score the Paint Seal

Look for visible paint bridges where the sash meets the stop or frame. Score only the accessible interior seams you can reach safely. Do not lean outside, work from an unsafe height or cut near glass without control of the tool.

Step 2: Work the Seam Gradually

Ease a stiff putty knife into the scored seam and work along the length rather than forcing one point. If the frame flexes, glass moves, or the sash does not respond to light pressure, stop.

Step 3: Use Gentle, Even Pressure

If the sash construction and condition allow it, use a protected wood block to apply light, distributed pressure. Avoid direct hammering or concentrated prying that can crack old glass or damage the frame.

Step 4: Clean the Accessible Track

Once the sash moves, remove loose paint or debris from accessible contact surfaces and test the window through a short range of motion. If cords, balances, locks or the frame are damaged, treat that as a separate repair rather than forcing the sash.

If the window remains stuck, the problem may be swollen wood, failed sash hardware, excessive paint buildup or another condition that needs a more careful repair. Required egress, guards and building rules can also affect what may be changed, so do not remove safety hardware just to make the window move.

Want help with the repair?

Send photos of the window and surrounding frame or call (347) 464-9717. We’ll clarify the repair scope and flag anything that belongs with the building or an appropriate licensed trade.