Don’t Get Hung Up: Fixing Your Double Hung Windows

When your double hung window repair becomes a necessity, you don’t always need a full replacement. Common problems like stuck sashes, drafts, broken glass, or a faulty balance system often have straightforward solutions that can restore your window’s function and beauty.

Many homeowners assume replacement is the only option, but repairing your original double-hung windows is often a smarter choice. It saves money, preserves your home’s unique character, and can make your windows work like new. Original windows were often built with high-quality, old-growth wood designed to last for over a century. With a little care, they can easily last another hundred years. This guide will show you how to tackle common problems and restore your windows yourself.

I’m Piotr Wilk, and my team at Rooster Windows and Doors, LLC, has spent over two decades installing windows and doors in Chicagoland. Our experience means we understand every aspect of double hung window repair, ensuring lasting quality for your home. Let’s explore how you can fix your double-hung windows.

Basic double hung window repair vocab:

The Case for Repair: Why Fix It, Not Replace It?

When a double-hung window acts up, it’s tempting to consider replacement. However, repair is often the smarter, more rewarding choice.

Financially, the difference is significant. A professional window restoration might cost $1,000 to $2,000 per window, but a DIY double hung window repair typically costs less than $50 in materials. This can save you thousands of dollars.

Beyond cost, original windows are a character-defining feature, especially in older Chicagoland homes. They were built with durable, old-growth wood and craftsmanship that modern replacements often can’t match. Many have already lasted over 100 years and can easily last another century, whereas modern windows may fail within a couple of decades.

What about energy efficiency? A properly weatherstripped historic window with a quality storm window can meet or exceed modern energy code requirements, offering energy savings nearly identical to new replacement windows. You can have both authenticity and efficiency.

Feature	Repair Original Double-Hung Window	Replace with New Double-Hung Window
Cost	Significantly lower (especially DIY)	Higher
Energy Savings	Comparable with weatherstripping & storm windows	Good, but often overstated vs. well-repaired originals
Aesthetic Impact	Preserves original character and charm	May alter historical appearance, especially if only one is replaced
Durability	Original wood built to last centuries	Modern windows often have shorter lifespans (e.g., IGU seals)
Environmental	Eco-friendly (reduces waste)	Higher environmental footprint

Regular Window Maintenance keeps small problems from becoming big headaches.

Benefits of Restoring Original Windows

Restoring your original windows breathes new life into something built to last. The old-growth wood used in their construction is incredibly dense and naturally resistant to decay, with tight grain patterns that modern lumber can’t replicate. This material is genuinely superior to what’s found in most new windows.

Restoration also preserves your home’s unique character. Finding a modern replacement that truly matches an older style is nearly impossible, and replacing just one window can disrupt your home’s entire appearance. Environmentally, restoration keeps good materials out of landfills. Plus, beautifully restored, functional windows can increase your home’s value. If you’re considering broader changes, learn more about Window Replacement options.

When to Consider Replacement

While we’re fans of repair, sometimes replacement is the right call. Consider replacement if you have:

Severe, widespread wood rot that has compromised the structural integrity of the frame and sash beyond what epoxy can fix.
Irreparable frame damage, such as significant warping or settling that prevents proper function.
Persistent seal failure in multi-pane insulated glass units (IGUs). If you see condensation between panes on windows that are 10-20 years old, they’ve likely reached the end of their lifespan.
A desire for modern features that can’t be retrofitted, like advanced security systems or integrated blinds.

Our team at Rooster Windows and Doors can help you decide which path is right. For a detailed breakdown of replacement costs, see our Cost to Replace a Window: Ultimate Guide.

Anatomy of a Problem: Understanding Your Window

Before starting your double hung window repair, it’s helpful to understand its components. Knowing the parts and how they work together is half the battle in diagnosing and fixing problems.

Essential Parts and Their Function

Let’s break down the key components of a double-hung window:

Upper and Lower Sashes: The movable frames holding the glass. In a double-hung window, both sashes can slide up and down.
Jambs: The vertical sides of the window frame that guide the sashes. Jamb liners are often used to provide a smooth track.
Balance System: This mechanism holds the sashes in place. Older windows use ropes and weights hidden in the wall, while modern windows use spring or spiral balances.
Parting Bead: A thin strip that separates the upper and lower sash tracks, allowing them to move independently.
Stops: Trim pieces that hold the sashes within the frame.
Sash Locks and Lifts: The hardware used to lock the window and provide a grip for opening and closing.

Understanding these parts is key to effective double hung window repair. For a comparison with other window types, see our guide on Double Hung vs Single Hung Windows.

Common Issues Requiring Repair

Recognizing these common problems is the first step toward fixing them:

Sash Won’t Stay Open or Slides Poorly: This almost always points to a faulty balance system, like a broken sash cord or a failed spring balance. This is the most common failure point.
Window is Painted Shut: Layers of paint can seal the sashes to the frame, making them immovable.
Drafty Windows: Usually caused by worn-out weatherstripping or gaps in the frame, leading to energy loss.
Rotten Wood: Moisture damage on sills, sashes, or frames can weaken the window’s structure but is often repairable with wood epoxy.
Cracked Glass: An impact or age can cause cracks, compromising insulation and security. Reglazing is the solution.
Broken Hardware: Sash locks, lifts, and tilt latches can break from wear and tear and usually require simple replacement.

You might also notice Condensation on Windows, which can indicate a failed seal in multi-pane windows.

Essential Tools and Materials for Double Hung Window Repair

Gathering your supplies before you start will make the process much smoother. Here’s what you’ll need for most double hung window repair projects:

Hand Tools: Utility knife, putty knives, pry bar or chisel, screwdrivers, hammer, measuring tape, and a sash saw for older windows.
Repair Materials: Wood epoxy (e.g., Abatron or Flex-Tec kits), glazing putty, diamond-point glazing points, high-quality cotton sash cord (like Samson Spot Cord), and weatherstripping (cushion bronze, spring bronze, or silicone bulb).
Finishing Supplies: Paint stripper (low-heat infrared tool or chemical), primer, and high-quality exterior enamel paint.
Replacement Parts: Have replacement glass panes and any necessary hardware like sash locks, lifts, or balance components ready.
Safety Gear: This is non-negotiable. You’ll need safety glasses, a P100 or N100 respirator (especially for potential lead paint), heavy-duty gloves, and coveralls.

If your house was built before 1978, assume the paint contains lead and take appropriate safety precautions as detailed later in this guide. For more information on lead safety, consult the WA State Dept. of Commerce lead-based paint safety resources. Before you begin, you may also want to review How to Remove a Double Hung Window Screen.

Your Complete Guide to Double Hung Window Repair

Ready to get started? This guide will walk you through each stage of the double hung window repair process. The key to success is patience and a methodical approach.

Step 1: Sash Removal and Jamb Preparation

First, you need to get the sashes out. If the window is painted shut, use a utility knife or sash saw to carefully cut all paint seals where the sashes meet the frame and stops.

Next, gently remove the interior stop molding using a thin putty knife or pry bar. Label each piece so you know where it goes during reassembly. With the stops off, the bottom sash can be pulled out. Detach the sash cords from the sides of the sash if you have a rope and weight system.

Now, carefully pry out the parting bead, the thin strip separating the two sashes. Once it’s out, the top sash can be removed just like the bottom one. With both sashes out, clean and scrape the jambs and tracks to remove built-up paint and grime. This is a good time to prime and paint the jambs.

Step 2: Addressing the Balance System

The balance system is critical to your window’s operation. This is where your double hung window repair efforts should focus if a window won’t stay open.

First, identify your balance type: traditional rope and weight systems or modern spring, spiral, or block-and-tackle balances.

For rope and weight systems, find the access panel on the inside of the jamb to get to the weight pocket. If a cord is broken, the weight will be at the bottom. Use high-quality cotton sash cord for replacements (Samson Spot Cord is recommended). Tie one end to the weight, drop it into the pocket, and feed the new cord over the pulley. Attach the other end securely to the sash in the groove where the old cord was. Repeat for all cords.

For spring or spiral balances, you’ll likely need to replace the entire balance cartridge or jamb liner unit. Carefully pry out the jamb liner and look for a size code on the balance to order the correct replacement. Follow the manufacturer’s instructions for installation and resetting the tension.

For more on window removal, our guide on How to Remove a Double Hung Window Screen has some helpful tips.

Step 3: Wood Repair and Paint Removal

Damaged wood and old paint are common challenges. Before starting, remember lead safety: assume windows in homes built before 1978 contain lead paint and take precautions (see our safety section for details).

For paint removal, use low-heat infrared strippers or chemical strippers to minimize dust. Scrape carefully, and if possible, use a scraper with a vacuum attachment. Always wet the surface before scraping to control dust.

To repair rot, use a chisel to clean out all soft, discolored wood until you reach solid material. For minor to moderate rot, use a two-part wood epoxy system like Abatron’s LiquidWood and WoodEpox. The liquid consolidates the wood fibers, and the epoxy fills the void. For a visual guide, watch this video on using epoxy for wood repair. For larger damaged sections, you may need to cut out the area and patch it with a new piece of wood (a Dutchman repair), secured with epoxy.

Once repairs have cured, sand everything smooth and apply a quality primer to seal the wood and epoxy from moisture.

Step 4: Reglazing and Painting

This step provides the finishing touches. Start by carefully removing old, hardened glazing putty and the small metal glazing points holding the glass. If replacing glass, wear heavy gloves. Clean the sash rabbet (the channel where the glass sits) completely.

Apply a thin bead of fresh glazing putty into the clean rabbet to create a waterproof seal (this is called bedding). Press the new glass pane into the putty. Secure the glass with new glazing points every 12 inches. Apply a smooth, 45-degree bevel of glazing putty over the points. This putty needs to skin over (3-5 days) before painting.

When painting, use a high-quality exterior wood primer followed by two coats of exterior enamel paint. Crucially, do not paint the sides, top, or bottom edges of the sash. These surfaces need to remain bare to prevent sticking and allow the wood to breathe. Paint only the face of the sash up to the glass.

Step 5: Hardware and Reassembly

Now for the final steps of your double hung window repair. Clean and restore original metal hardware by carefully removing old paint. If hardware is broken, purchase quality replacements that match the original style.

Begin reassembly by placing the top sash back into its exterior track, reattaching cords if necessary. Gently tap the parting bead back into its groove. Next, place the bottom sash into its interior track and reattach its cords.

Reinstall the interior stops, leaving a very slight gap (about the thickness of a credit card) between the stop and the sash to allow free movement. Test both sashes to ensure they move smoothly and stay open. Adjust the stops if they bind. Finally, install your restored or new hardware. You’ve just completed a repair that will serve your home for decades.

Safety First: Handling Lead Paint and Other Hazards

Safety is the most important part of your double hung window repair project. Homes built before 1978 likely have windows coated in lead-based paint. Disturbing this paint without proper precautions can create serious health hazards from lead dust, which is especially dangerous for children.

How to Ensure Lead Paint Safety During Your Double Hung Window Repair

The golden rule is to always assume lead paint is present and take the following precautions:

Use Proper PPE: Wear a P100 or N100 respirator, safety goggles, heavy-duty gloves, and disposable coveralls. A standard dust mask is not sufficient. Shower and wash work clothes separately after finishing for the day.
Contain the Work Area: Lay down 6-mil plastic sheeting to catch all debris. Indoors, seal off the room, including doorways and HVAC vents, to prevent dust from spreading.
Work Safely: Wet surfaces before scraping to minimize airborne dust. If using power tools, connect them to a HEPA vacuum. Avoid high-heat guns that can vaporize lead; instead, use low-heat infrared paint removers or chemical strippers. Never dry sand old paint, as it creates massive amounts of lead dust.
Clean Up Carefully: Bag all debris, contaminated plastic, rags, and disposable PPE in heavy-duty plastic bags. Seal them tightly and dispose of them as hazardous waste according to local regulations.

For comprehensive guidance, consult the WA State Dept. of Commerce resources on lead-based paint safety. Your health is not worth the risk.

Frequently Asked Questions about Double Hung Window Repair

Here are answers to the most common questions we hear about double hung window repair.

How long does it take to repair one double-hung window?

Depending on the extent of the repair and your skill level, a DIY repair can take from an afternoon to a full weekend per window. This includes passive time for paint and putty to dry. Materials typically cost between $51 to $100 per window.

Can I improve the energy efficiency of my old double-hung windows?

Yes. Properly reglazing, repairing the balance system, and adding quality weatherstripping can dramatically reduce drafts. When combined with a high-quality storm window, a restored historic window can meet or even exceed the performance of a new replacement, as detailed in our guide on How to Insulate Windows.

What is the most common point of failure on a double-hung window?

The balance system is the most common culprit. It supports the sash’s weight and is in constant use. For older windows, a broken sash cord is the typical failure. In newer windows, a failed spring or spiral balance is more common, causing the sash to slam shut or become difficult to lift.

Conclusion

This guide should give you the confidence to tackle your double hung window repair. Repairing your original windows saves thousands of dollars compared to replacement, preserves your home’s unique character, and restores components built with high-quality materials designed to last.

By properly weatherstripping, reglazing, and repairing your windows—and adding a quality storm window—you can achieve energy efficiency that rivals or even exceeds modern replacements. You don’t have to sacrifice authenticity for performance.

However, it’s also important to know your limits. While many repairs are great DIY projects, extensive damage or a desire for a full upgrade may call for professional help. If you’re facing widespread issues or are ready for modern, energy-efficient windows, our team at Rooster Windows and Doors, LLC, is here to help.

With over two decades of experience in Chicagoland, we provide flawless installations when replacement is the right choice. For more on our services, see our Window Installation Services: Complete Guide.

Whether you’re restoring an original or selecting a new window, we’re here to ensure quality results. Explore high-quality Double Hung Windows on our website to see the options available for your home.