Sash Cord, Chain & Pulley Repair in Boston

Window won't stay up? 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 repair the whole system: sash cords, sash chains, pulleys and weights. This is the most common job we do, as part of our full wood window repair service. Most repairs are finished in one visit.

Why your window won't stay up

A double-hung sash is held at any height by a counterweight that matches its weight. When the link to that weight fails, gravity wins and the sash drops. Three things cause it:

• The sash cord snapped. Cotton rope dries out and frays where it passes over the pulley. This is the usual answer in a pre-1950 window.

• The pulley seized. The wheel no longer turns, the cord saws against it and breaks again within a year.

• The weight came off. The knot pulled out of the sash pocket, or the weight dropped down inside the wall cavity.

Top sash won't stay up? The upper sash sits behind the lower one and has its own pair of cords and weights. It fails the same way, and it is often ignored for years because the window still opens at the bottom. The repair is the same, it just takes longer to reach.

Single-hung window won't stay up? Only the lower sash moves, so there is one pair of cords to replace. Usually the fastest version of this job.

If your window has no weights inside the jamb, it uses a spiral or channel balance instead. We repair those too, on the same visit. Call (617) 982-1211 and describe the window.

Sash cord replacement

We re-rope double-hung windows with new cotton sash cord sized to the sash so it balances and holds at any height. The old cord, the knot and the weight all come out, the pocket gets cleaned, and the trim goes back so the repair does not show. On a sash that gets opened we replace both cords, not just the broken one: the second is the same age and will fail next.

Sash chain replacement

Brass or stainless sash chain replaces cotton cord and lasts far longer. It does not dry out and does not fray on the pulley, which makes it the right choice for a window opened every day, a kitchen window over a sink, or any sash you do not want to re-rope again in ten years. We convert cord to chain during the same visit, and the chain is invisible once the sash is back in.

Window pulley repair and replacement

The pulley is the wheel mortised into the top of the jamb that the cord runs over. A hundred years of paint, rust and dirt seizes it. A seized pulley is why a brand-new cord frays through within a season, so we check every one while the sash is out. If the wheel does not spin freely we replace the pulley with new brass or steel hardware that fits the existing mortise, rather than forcing a new cord over a dead wheel.

If the whole rope-and-pulley system has been painted over, disconnected, or packed with insulation by a previous owner, we can rebuild it from scratch: new pulleys, new cords, weights re-hung and balanced.

Window weight replacement

The cast iron weights hang inside the jamb pocket and have usually been there since the house was built. They rarely wear out, but they go missing: dropped into the wall, removed during an insulation job, or taken out and never put back. We fish weights out of the cavity, add matching weights where they are gone, and recalibrate so the sash holds instead of creeping up or sliding down.

How the repair works

Sash cord work means opening the side pocket of the jamb to reach the hidden weights. Our process:

• Remove the window stop and lift out the sash

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

• Retrieve the broken cord and the counterweight

• Check the pulley and replace it if it no longer turns freely

• Install new cotton cord or brass chain, your choice

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

• Test that the sash holds at every height, top and bottom

How much does sash cord replacement cost?

We price sash cord repair per sash, not per hour, and every job gets a written estimate before we start. These are the prices we charge in the Boston area:

• $125 per sash, one rope. When a single cord has broken and the other is still sound.

• $250 per sash, both ropes. Our standard job. The second cord is the same age as the one that failed, so replacing both now avoids a second service call.

• $195 per sash, cord plus pulley. For a lower sash where the pulley is worn or seized and has to come out.

• $290 per sash, conversion to chain. Brass or stainless chain in place of cotton cord, for windows that get used daily.

Sash cord work takes no deposit. You pay when the window opens, holds, and closes properly.

For comparison, replacing a double-hung unit runs $800 to $2,500 per window installed. Cord repair restores the same function for a fraction of that and keeps the original wood, which in a Boston home built before 1940 is usually old growth and denser than anything sold today.

What you are paying for

The rope itself costs almost nothing. The price covers the work around it: taking off the stop and the sash without splitting painted trim, opening the pocket in the jamb, fishing out a cast iron weight that has been sitting inside the wall since the house was built, sizing the new cord so the sash balances and holds at any height, then putting the trim back so the repair does not show.

What makes the price go up

• Sashes painted shut, which have to be cut free before anything else

• No access panel in the jamb, so the pocket has to be opened and closed again

• A pulley that has seized and needs replacing, not just re-roping

• Upper sashes, which sit behind the lower one and take longer to reach

• Storm windows or screens that must come off first

• Windows above the second floor

None of this is guesswork on the invoice. We look at the windows, then put the number in writing before we start.

What it costs for a whole house

Most people do not do every window at once. A typical call is two to six sashes, the ones that have already failed, which comes to $500 to $1,500 at our standard $250 per sash for both cords. A full first floor is usually four to eight sashes, $1,000 to $2,000. An entire house of twelve double-hungs is around $3,000. Grouping windows into one visit costs less than calling us back a second time.

Doing it yourself

The parts are cheap and the job looks simple on video. What we get called in to fix afterward is usually one of four things: the stop split when it was pried off a painted joint, the weight dropped into the pocket and cannot be reached, the new cord was cut to the wrong length so the sash bottoms out or hangs above the sill, or the sash was forced while it was still painted shut and the rail cracked. At that point the repair costs more than it would have.

When it is not just the cord

Sometimes the cord is the symptom, not the problem. If the sash rail is soft where the knot sits, the new cord will pull out of it again. If the sill under the window has gone spongy, the sash sits crooked in the opening and wears the rope on one side. We check both during the estimate and tell you before starting, so the number does not change halfway through. Related work: rotten sash repair and window sill repair. If the window is also drafty once it moves again, weatherstripping is worth doing in the same visit while the sash is out.

Here is one of these repairs start to finish: sash cord and weight repair in Boston.

Common questions

How long does it take? A single window is done in one visit. Several windows in the same house are usually finished the same day.

Do both cords need replacing? On a sash that gets used, yes. The second cord is the same age as the one that broke, and coming back for it later means paying for the access work twice.

Cotton cord or chain? Cotton cord is the original material and the right choice for a historic window that is opened occasionally. Chain at $290 per sash lasts far longer and makes sense on windows opened every day.

Do you remove the whole window? No. The sash comes out, the frame and the trim stay in place.

My window has no weights, can you still fix it? Yes. That window uses a spiral or channel balance instead, and we replace those as well.

Can you fix a window that has been painted shut for years? Yes. We cut the sash free first, then do the cord work. It adds time, and we tell you before starting.

Is it worth repairing a hundred-year-old window? The wood in a pre-1940 Boston window is old growth, denser and more rot resistant than what a new unit is built from. Re-roping it costs a fraction of the $800 to $2,500 a replacement unit runs installed.

Do you charge for the estimate? No. The assessment visit is free.

Sash cord repair near you, same week

Most sash cord, chain and pulley repairs are scheduled within the same week of your call, across Boston, Newton, Brookline, Wellesley, West Roxbury, Cambridge and surrounding towns. Every repair carries a one year warranty on labor and materials, with an optional five year extended warranty available. Call (617) 982-1211 or send photos of the window for a free estimate.