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How to do Installation of Double Hung Windows


Installing double-hung windows can pose challenges such as ensuring proper alignment, addressing structural considerations, and managing the weight of the window during installation. Precise measurements, careful shimming, and attention are crucial for installing the window and achieving a successful and durable outcome.

For DIY installers, we’ve arranged the installation steps in a clear sequence. Take a look and proceed with installing your double-hung window with confidence.

Tools Needed for the Window Installation: 

  • Safety glasses
  • Fiberglass batt insulation
  • Tape measure
  • Utility knife
  • Combination square
  • Stiff putty knife
  • Caulk gun
  • Level
  • Chisel

Step 1: Check Measurements

Before initiating the installation process, it is essential to meticulously measure the width and height of the window opening using a reliable tape measure. To ensure accuracy, take measurements from multiple points and cross-reference them with the specifications provided by the manufacturer. This careful assessment guarantees that the dimensions align appropriately with the double-hung window intended for installation.

Step 2: Remove Old Stops & Sash

To prepare the window for the new installation, use a pry bar or suitable tools to delicately remove existing stops or trim. Take care to identify and remove any screws or nails securing the old sashes to the window frame. This process should be executed with precision to avoid any damage to the window frame or surrounding areas. Dispose of the removed materials responsibly to maintain a clean and organised workspace.

Step 3: Clean Opening & Apply Sealant

After removing the old stops and sashes, the next step involves preparing the window opening. Thoroughly clean the opening, eliminating any accumulated dirt, dust, or debris. Utilise a suitable cleaning solution and tools to ensure a pristine surface for the new window installation. Following the cleaning, apply a high-quality sealant evenly around the entire perimeter of the opening. This sealant serves as a crucial weather-resistant barrier, preventing drafts and enhancing overall insulation.

Step 4: Insert Window

With the opening cleaned and sealed, gently lift the double-hung window and position it within the designated space. Carefully centre the window to ensure an even distribution of space on each side. Adjust the window’s position as needed to achieve proper alignment with the opening, taking care to handle the window with caution during this process.

Step 5: Insert Shims & Tighten Screws

To provide additional support and secure the window in place, insert shims between the window frame and the opening. Begin securing the window by loosely installing screws into predetermined locations on the frame. Gradually tighten the screws while monitoring the level and plumb of the window. Make necessary adjustments to ensure a secure and level fit within the opening.

Step 6: Insulate & Apply Stops

Moving to the interior side of the window, enhance energy efficiency by applying insulation around the exterior of the window frame. Install new stops or trim to secure the window in place, ensuring that these components cover any gaps and contribute to a polished, finished appearance. The insulation not only provides functional benefits but also adds an extra layer of energy efficiency to the installation.

Step 7: Examine if everything is okay

Conclude the installation process with a comprehensive examination of the double-hung window. Check the alignment and smooth operation of the sashes within the frame. Inspect the seal for any gaps or imperfections that might compromise efficiency. Confirm that all screws are securely tightened, providing structural stability to the newly installed window. Address any issues identified during the examination before finalising the installation to ensure a successful and lasting outcome.

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Wrapping UP

Mastering the installation of double-hung windows requires a meticulous approach and adherence to a systematic process. From precise measurements and careful removal of old components to the application of sealants, shims, and insulation, each step contributes to a successful installation. Ensuring proper alignment and thorough examination post-installation guarantees longevity and efficiency. Whether upgrading or starting anew, these steps ensure a professionally installed double-hung window. Finally, a well-installed window enhances aesthetics, improves energy efficiency, and delivers lasting satisfaction for homeowners.

More to know

1. Can I install a window from the inside?

Yes, windows can be installed from the inside, especially in cases where external access is limited or when replacing existing windows.

2. Can you install double-hung windows horizontally?

No, double-hung windows are designed to be installed vertically, with one sash above the other for ease of operation and ventilation.

3. How high should a double-hung window be from the floor?

There isn’t a strict rule, but a common recommendation is to install double-hung windows approximately 36 inches above the floor. Adjustments may be made based on personal preference, aesthetics, or specific architectural considerations.

Director at Chesterfield Window Centre | Website

In 2005, I founded Chesterfield Window Centre with a vision to redefine the window and door industry through a commitment to quality, innovation, and customer satisfaction. The journey began with a deep understanding of the market, identifying gaps, and envisioning a business that not only meets but exceeds customer expectations.

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