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. 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. Call (617) 982-1211 to schedule your free estimate.