If you manage an apartment community or handle maintenance for residential properties, you have probably encountered a window that suddenly becomes difficult to open, will not stay open, or feels much heavier than it should.
In many cases, the problem may be a broken or worn window balance.
Window balances are an important part of many double-hung and single-hung windows. They help support the weight of the window sash and make it easier to open, close, and keep the window in position.
When a balance fails, the window may still look perfectly fine—but it may no longer operate properly.
What Is a Window Balance?
A window balance is a mechanical component inside the window frame that helps counterbalance the weight of the window sash.
In a typical double-hung window, the balance helps support the sash as it moves up and down. Depending on the age and style of the window, there are several different types of balances.
Common types include:
- Block and tackle balances
- Spiral balances
- Constant force balances
- Coil balances
- Other manufacturer-specific balance systems
Although they perform a similar function, these balances are not interchangeable. The correct replacement depends on the window design, balance type, dimensions, and sometimes the manufacturer’s specifications.
Signs That a Window Balance May Be Broken
A failed balance can cause several noticeable problems.
1. The Window Will Not Stay Open
One of the most common signs is a sash that drops down after you raise it.
If the window will not remain in the position where you leave it, the balance may no longer be providing the proper support.
2. The Window Suddenly Feels Heavy
If a window that normally opens easily becomes difficult to lift, a balance may be damaged, disconnected, or worn out.
3. The Window Falls When You Release It
A window sash that drops unexpectedly can be more than an inconvenience. It can create a safety concern for residents and maintenance personnel.
4. The Window Is Difficult to Raise or Lower
If the sash feels unusually stiff, uneven, or difficult to operate, the balance system may need to be inspected.
5. You Notice a Broken or Loose Component
Depending on the type of balance, you may be able to see a broken spring, damaged cord, disconnected hook, or other component inside the window frame.
Why Identifying the Correct Balance Matters
One of the biggest mistakes when replacing a window balance is assuming that a balance that looks similar will work.
Window balances come in many different styles, sizes, and weight capacities.
Two balances may look almost identical but have different specifications.
Using the wrong balance can result in:
- A window that is difficult to operate
- A sash that will not stay open
- A sash that moves too quickly
- Improper operation
- Premature failure of the replacement balance
For this reason, it is important to identify the existing balance as accurately as possible before ordering a replacement.
How to Identify a Window Balance
The information needed will depend on the type of balance and the window.
When possible, start by identifying the type of balance installed in the window.
Look for Manufacturer Markings
Some balances have numbers, letters, or manufacturer markings stamped or printed on them.
Take note of any information you find.
Even a small number stamped on a balance can sometimes help determine the correct replacement.
Measure the Balance
Measurements may also be necessary.
Depending on the type of balance, useful measurements can include:
- Overall balance length
- Width
- Diameter
- Tube length
- Spring size
- Channel dimensions
- Other component dimensions
It is important to measure the appropriate part rather than assuming that the window’s overall size corresponds to the balance size.
Identify the Window
If possible, determine the window manufacturer or model.
Look for labels, stickers, stamps, or other identifying information on the window, sash, frame, or glass.
Information about the window itself can sometimes be just as helpful as information about the balance.
Take Photos Before Removing Anything
If you are not sure what type of balance you have, photos can be extremely helpful.
Take clear pictures of:
- The entire window
- The window sash
- The balance installed in the window
- Any markings or numbers on the balance
- The end of the balance
- Any damaged or broken components
- The window manufacturer’s label, if available
A close-up photo of the balance can often provide valuable information when trying to identify a replacement.
If the balance has already been removed, photograph the complete balance and its components together.
Don’t Throw Away the Old Balance
If a balance has failed, it may be tempting to throw it away immediately.
If possible, keep the old balance until the replacement has been properly identified.
The original part can provide important information about:
- Its style
- Its dimensions
- Its markings
- Its attachment method
- Its manufacturer
- Its configuration
For maintenance departments managing multiple properties, keeping the original part—or at least taking detailed photographs before disposal—can save time when ordering replacements.
What If You Have Multiple Windows With the Same Problem?
For apartment communities, it is common to encounter the same window style throughout a property.
If several windows have failed balances, don’t assume that every balance is identical simply because the windows look the same.
If possible, compare the existing balances and window information before placing a large order.
Keeping records of the correct balance for each property or window type can also make future maintenance much easier.
Repairing a Window Balance Can Be More Cost-Effective Than Replacing the Entire Window
A broken balance does not necessarily mean the entire window needs to be replaced.
In many cases, the window itself may still be in good condition and only the balance needs to be replaced.
Replacing the appropriate component can restore normal window operation without the expense and disruption of replacing the entire window.
For property managers, this can be especially helpful when maintaining a large number of units.
Need Help Identifying a Replacement Window Balance?
Identifying an older or damaged window balance can sometimes be difficult, especially when there are no visible markings or the original manufacturer is unknown.
That’s where having the right information—and the right replacement-parts resource—can make the process easier.
Davidson Sash & Door, Inc. works with replacement window and door hardware and can help customers determine what information is needed to identify replacement parts.
If you’re unsure what balance you need, start by gathering the following:
✓ Photos of the window
✓ Photos of the existing balance
✓ Any numbers or markings
✓ Measurements of the balance
✓ Window manufacturer information, if available
✓ Property or unit information
The more information you can provide, the easier it may be to determine the correct replacement.
Have a Broken Window Balance?
Before ordering, take a few pictures and gather the measurements and markings from the existing balance.
Not sure what part you have? Send Davidson Sash & Door photos of the window and the existing part, and we’ll help you determine what information is needed to identify the replacement.
Whether you’re maintaining a single home or managing hundreds of apartment units, correctly identifying the replacement part the first time can help save time, reduce unnecessary orders, and get the window back into service sooner.
Davidson Sash & Door, Inc.
Replacement Window & Door Parts • Custom Window Screens • Storm Doors • Blinds
Serving property managers, maintenance professionals, contractors, and homeowners with replacement window and door needs.