Sash Cord Repair
Sash cord repair service based in South East London. Whether one cord has snapped or all four have perished with age, our experienced team repairs broken sash cords and replaces spiral balances to restore smooth, safe sash window operation. Prices start at £70 to replace one cord, rising to £180 for all four sash cords on an average sized sash window.
Because sash cords are a wear item rather than a manufacturing fault, it’s normal for even a well-maintained window to need the cords replaced. As a result, whether just one cord or all four cords and balances have failed, our experienced team provides professional sash cord repairs for traditional timber sash windows, using the same methods and materials that have kept these windows running for well over a century.
Why Choose Our Sash Cord Repair Service
- Over 25 years of sash window repair experience
- Traditional timber repair methods
- Fast and reliable local service
- Free no-obligation quotations
- Specialists in period sash windows
Why Do Sash Cords Fail?
Sash cords don’t usually fail without warning; unless the knot tying the weights to the cord has failed, the weights usually wear gradually until they snap. Understanding why helps explain what we look for during a repair, and why we often recommend replacing all the cords on a window rather than just the one that’s snapped.
- Age and material wear — traditional waxed cotton cord has a working life, and once the fibres dry out and become brittle, they’re prone to snapping under the sash’s weight.
- Uneven wear across cords — because all four cords carry the same sash daily, if one has failed through age, the others are usually close behind. This is why we’ll often flag replacing the full set, even if only one has broken.
- Pulley wheel problems — a stiff, rusted, or damaged pulley wheel forces the cord to drag rather than run smoothly, which accelerates fraying at exactly the point where the cord passes over the wheel.
- Repainting over sash cords — when paint is applied without protecting the cords, it stiffens the fibres and accelerates cracking, so we always check for this during inspection.
- Weight or balance mismatch — if a sash has been altered, reglazed with heavier glass, or previously repaired with the wrong weight, the cord can be placed under more tension than it was designed for, considerably shortening its lifespan.
Common Signs Your Sash Cords or Spiral Balance Need Replacing
If your sash windows are becoming difficult to operate, a broken sash cord or spiral balance — otherwise known as a sash window spring balance — may be the cause. Common signs include:
- The window will not stay open — usually because the cord has snapped and the counterbalance weight is no longer supporting the sash.
- The sash drops suddenly when opened — a clear sign that the cord has failed partway through use, or is about to.
- Snapped, frayed, or worn sash cords — visible fraying, especially near the pulley wheel, tells us the cord is close to failing.
- Stiff or uneven window movement — often caused by a worn pulley wheel or a cord that’s binding inside the box frame.
- Rattling sash windows — can indicate a cord has come loose from its knot or a spiral balance has lost tension.
- Broken sash window pulley wheel — since the cord runs directly on it, a damaged pulley wheel will quickly wear through a sash cord.
- Spiral balance hanging below the sash window — a sign the balance has detached or lost its grip, meaning the sash is no longer properly supported.
Sash Cord vs Spiral Balance: Which Do You Have?
Not every sash window uses the same counterbalance system, so it’s worth understanding which one yours has before booking a repair.
What Is a Sash Cord?
Sash cords are the ropes used to connect the counterbalance weights hidden inside the box frame of a sash window. These weights help the window open and close smoothly while supporting the sash in position. Traditional box sash windows generally need wider side boxes to accommodate these weights, which is why they’re most common in older, more generously proportioned properties.
What Is a Spiral Balance?
A spiral balance is a spring-loaded tubular mechanism that supports and holds a sash window in position by applying controlled tension, rather than relying on a weight and pulley system. Also known as sash window springs, spiral balances perform the same job as traditional sash cords and weights. However, they’re generally more complex to install and often cost more to replace than a straightforward cord.
Spring-loaded sash windows are typically installed where there isn’t enough cavity space for traditional weighted box frames, since the spiral mechanism sits within a much slimmer frame. Because of this, spiral balances tend to appear more often in later or narrower window installations, while original Victorian and Georgian box sashes almost always use cord and weight.
Frequently Asked Questions About Sash Cord Repair
Type of Sash Cord?
We use high-quality traditional waxed sash cord, chosen specifically for its strength and long-lasting performance. Unlike cheaper synthetic alternatives, waxed cotton cord grips the pulley wheel well and matches the traditional character of period sash windows, so it’s usually our default recommendation unless a property has particular access or budget requirements.
Can You Replace Just One Sash Cord?
Yes. We can replace one sash cord or all four on each window. That said, because all four cords typically wear at a similar rate, we’ll usually recommend replacing the full set at the same time — it’s a small extra cost during the same visit, without you having to pay for a second call-out when a neighbouring cord fails a few months later.
Can Spiral Balances Be Repaired?
In many cases, spiral balances are replaced rather than repaired, since the internal spring mechanism isn’t designed to be serviced once it has lost tension. Replacing the balance restores reliable operation more quickly and reliably than attempting a partial repair.
Do You Cover South East London?
Yes. We provide sash cord repair services throughout South East London and the surrounding areas, including Greenwich Park, Westcombe Park, Charlton, Blackheath, Kidbrooke, Woolwich Arsenal, Lewisham, Hither Green, Brockley, Eltham, Ladywell, Plumstead Common, Shooters Hill, Crofton Park, Catford, Bellingham, Forest Hill, Thamesmead, Mottingham, Dulwich, Sydenham, Brixton, Streatham, Honour Oak, Bexley, Bromley, Hackney. If you’re unsure whether we cover your postcode, get in touch, and we’ll confirm.
How To Replace A Sash Cord For A Window: Step-by-Step Guide
Replacing a sash cord properly means gaining access to the box frame without damaging the surrounding joinery, then guiding a new cord through the pulley system so the sash and weight are balanced correctly. Most repairs are completed within a couple of hours per window, though this depends on the condition of the beads, pulleys, and frame. Here’s how we approach it:
1. Window Inspection
Before starting any repair, we assess the condition of the sash cords, pulleys, weights, and timber frame. This lets us confirm whether a straightforward cord replacement is enough, or whether additional repairs — such as a worn pulley wheel — are needed at the same time.
2. Carefully Remove Beads
We carefully remove the staff beads on each side of the box frame to avoid damage, then remove the bottom sash. After removing the sash, the next step is to remove the parting beads to gain access to the pockets on each side of the box frame. Once these are free, the pockets can be pulled out using a chisel or a scraper.
3. Sash Cord Replacement
With the pockets open, we gain access to the sash window weights inside the box frame. We then take out the weights used as a counterbalance for the window. If the broken cords are still tied on, we cut them off before preparing the new sash cord for fitting.
4. Pulley Wheel & Weights
This step requires a piece of string long enough to reach from the pulley wheel down to the bottom of the sash window sill, along with a small piece of lead — small enough to fit through the pulley wheel mechanism. Tied to the string, this forms a simple tool commonly called a “mouse,” which guides the new sash cord through the pulley wheel and down to the pocket, so the weight can then be tied onto the new cord.
5. Reassembly & Testing
Once the weight is tied back onto the new sash cord, the window can be put back together. The pockets go back into place, followed by the parting bead. From there, we screw or pin the cords with clout nails, then pin the staff beads back using oval nails or panel pins. Finally, we test the window thoroughly to confirm it opens, closes, and holds position smoothly.
Caring For Your Sash Cords After Repair
Once your sash cords or spiral balance have been replaced, a little care goes a long way toward avoiding a repeat repair for many years:
- Avoid painting directly over the cord — always protect it or mask it off during redecoration, since paint stiffens the fibres and shortens their working life.
- Keep the pulley wheels moving freely — a light application of appropriate lubricant on a sticking pulley reduces friction and prevents premature wear on the cord.
- Don’t force a sticking sash — if a window becomes stiff, get it checked rather than forcing it, since forcing a sash under tension is one of the most common causes of a cord snapping unexpectedly.
- Have all four cords checked periodically, even if only one has needed attention, since cords that have carried the same load for the same length of time tend to fail within a similar window of each other.
Sash Cord Replacement Cost Guide
Prices may vary depending on window condition, accessibility, and any additional repairs required.
| Service | Price |
| Replace one bottom sash window cord | £70 |
| Replace one top sash window cord | £80 |
| Replace both bottom sash window cords | £110 |
| Replace both top sash window cords | £130 |
| Replace all four sash cords | £180 |
Request a Free Quote
If your sash windows are rattling, dropping, or difficult to open, don’t wait for a cord to snap completely. Contact us today for a free, no-obligation quotation, and we’ll let you know whether a single cord repair will do the job or whether replacing the full set makes more sense for your window.