Window won't stay open? Won't open at all? It's almost always the sash cord.

Double-hung windows in Boston-area homes use a counterweight system hidden inside the frame. Cotton sash cords (or chains) connect the window sash to iron weights through a pulley at the top of the jamb. When a cord breaks — and they all break eventually — the window won't stay up, won't slide smoothly, or won't move at all.

We restore this system to working condition, as part of our full wood window repair service. Most repairs are completed in a single visit.

How sash cord repair works

The repair requires opening the side pocket of the window jamb to access the hidden weights. Here's our process:

• Remove the window stop and lift out the lower sash

• Open the access panel inside the jamb (carefully, to preserve trim)

• Retrieve the broken cord and counterweight

• Install a new cotton sash cord or modern chain (your choice — chains last longer)

• Reattach the weight, set proper tension, and reinstall the sash

• Test smooth operation through full range of motion

What we replace

• Sash cords — traditional cotton cord, the original material

• Sash chains — modern brass or stainless chains, longer lifespan

• Pulleys — replace worn or seized pulleys with new brass or steel hardware

• Weights — replace if missing or recalibrate if window doesn't balance

• Spring balances — for newer double-hung windows that use spring systems instead of weights

Why it matters

A double-hung window that won't stay open is more than annoying — it's a safety hazard. Children and pets can be injured by falling sashes. And a window that doesn't function properly can't ventilate your home or escape during emergencies.

Pricing

Sash cord replacement typically costs $125–$500 per window depending on access difficulty and whether you choose cord or chain. We provide free written estimates with no obligation.

Same-week scheduling

Most sash cord and pulley repairs are scheduled within the same week of your call, across Boston, Newton, Brookline, and surrounding towns. Call (617) 982-1211 to schedule your free estimate.