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A Step-by-Step Window Replacement Guide

Thinking of upgrading your windows at home? Replacing your windows is a smart way to improve energy efficiency, allows you to open and close your windows with ease, and it refreshes the look of your home to boot. But how do you get started? Whether you need new double pane or tempered glass windows, our step-by-step window replacement guide will arm you with the knowledge and provide you with additional pro tips needed to set you up for a smooth DIY replacement window installation.

Tools Needed to Replace Windows

Having the right tools for your project can depend on the type of window you're replacing and sometimes even the condition of your home. It's always a good idea to have a few extra tools on hand just in case, but make sure to grab these essentials:

  • Drill and Driver Bits
  • Caulk Gun
  • Shop Vacuum
  • Oscillating Tools and Blades
  • Tape Measure
  • Putty Knife
  • Level

Materials Needed to Replace Windows

Before you head out to your local hardware store, these materials should be included on your shopping list:

  • Wood Filler
  • Silicone Caulk
  • Window Spray Foam Insulation
  • Flashing Tape
  • Latex Caulk

Window Replacement - Step by Step

With tools, materials, and any protective equipment within reach, it’s time to go through the essential steps to replacing your windows. From measuring your window openings to gearing up for the installation, we’ve got you covered.

1. How to Measure for Replacement Windows

Measuring could be the difference between an airtight seal and a misaligned mess. As the saying teaches us, it’s important to measure twice for the best chance at accuracy.

  1. Width: Measure the distance between the inside edges of the window opening at the top, middle, and bottom.
  2. Height: Measure the distance between the inside edges of the window opening on the left and right sides.
  3. Depth: Measure the depth of the window opening.
  4. Note any obstructions: If there are any obstructions like trim or molding, measure the distance to the nearest edge of the opening.

2. Remove the Sash

Now it's time to remove the old window sash (the part of the window that slides up and down). If the sash gets stuck, use a putty knife to separate it so it can manouver freely. When you’re ready:

  1. Open the window: If the window has a crank, turn it to open the window fully.
  2. Release the sash locks: Locate the sash locks and release them (usually small levers or buttons).
  3. Lift the sash: Gently lift the sash out of the window opening.

3. Take Off the Jamb Liners

Once the window sash is gone, you can start taking off the jamb liners that surround the window opening. Be careful not to damage the walls or trim. Using gentle yet firm pressure you can:

  1. Pry off the trim: Use a putty knife to carefully take off the trim pieces.
  2. Remove the nails: Remove any nails or screws that are holding the jamb liners in place.

4. Prepare the Rough Opening

Before jumping to installing the replacement window, you’ll need to remove any old caulk, weatherstripping, and insulation that could get in the way. While the rough opening is exposed, look for any damage or dirt that needs your attention, that way the new replacement window can be installed properly.

  1. Inspect for damage: Check the rough opening for any signs of rot, damage, or moisture. If you find any issues, you may need to repair it before proceeding.
  2. Remove any caulk or sealant: Use a putty knife to remove any old caulk or sealant from the rough opening.
  3.  
  4. Install Flashing Tape: Apply around the opening for weatherproofing.

5. Dry-Fit the Window

Lift the replacement window frame into the opening. It should be a snug fit with a little room to allow for leveling if needed.

  1. Install backer rod (if necessary): If the rough window opening is wider than the new window frame, you may need to install a backer rod (foam material that is used to fill gaps and prevent air leaks) to fill and level out the gap between the frame and the opening.
  2. Place shims under the window frame (if needed): Place shims under the window frame where needed to level it.
  3. Check to see if it’s level: Adjust the shims until the window is level (using your bubble level).

6. Install the Window

Now for the main event: installing your new window! If you need help during this process, you can always ask for someone to assist you (having an extra pair of hands can prevent glass breaking from an accidental drop). When you’re ready, carefully:

  1. Position the window: Carefully place lower the new replacement window into the rough window opening, ensuring that it is level and plumb.
  2. Secure it in place: Secure the window frame to the rough opening using the provided screws or nails.
  3. Inspect for air leaks: Check the window area around the rough opening for any air leaks and seal them with caulk or flashing tape.
  4. Install the jamb liners: Reinstall the jamb liners around the window opening.
  5. Caulk the trim: Caulk around the trim pieces to seal any gaps.

Tip: Follow the manufacturer's instructions for your specific window model for exact installation details or reach out to a glass specialist who’s familiar with this process.

7. Insert Spray Foam

Spray foam is a great way to create an air-tight seal around the window frame.

  1. Apply the foam: Follow the manufacturer's instructions to apply the spray foam to the window opening.
  2. Fill the gaps: Fill all the gaps between the window frame and the rough opening with the foam.
  3. Allow the foam to cure: Make sure the foam has enough time to cure completely before moving on to the next step.

8. Caulk the Frame

After the spray foam has cured, you can caulk the window frame to seal any remaining gaps.

  1. Apply a bead of caulk: Apply a bead of caulk along the edges of the window frame.
  2. Smooth the caulk: Smooth the caulk with your finger or a putty knife.
  3. Let it cure completely: Allow the caulk to cure (for a water and air tight seal) before moving on to the next step.

9. Seal the Window, and Prime and Paint

The final step is to seal the window and finish the trim.

  1. Seal the window: Apply a bead of caulk around the exterior of the window frame to seal any gaps.
  2. Prime and paint: Prime and paint the window frame and trim with high-quality paint where needed to match the existing trim in your home.

Need Help Replacing Your Windows? Call Glass Doctor

Window replacement is a fantastic way to improve your home's energy efficiency, comfort, and curb appeal. But let's be honest, DIY window installation can be challenging even if you’ve come prepared. While this guide has detailed the necessary steps to upgrading your windows, bringing in a professional like Glass Doctor® can make all the difference:

  • Improper measurements: Even a small mistake in measuring can lead to a window that doesn't fit properly. This can create air leaks, water infiltration, and wasted energy.
  • Safety hazards: Removing old windows and installing new ones can involve working at heights and using sharp tools. Improper handling can lead to injuries.
  • Warranty concerns: Some window manufacturers void warranties if the windows are not installed by a professional.

Let Glass Doctor take the stress out of replacing your home windows – with upfront pricing, premium materials, plus glass specialists who are highly trained to handle all the details (and account for any issues too). We also stand by our Neighborly Done Right Promise®, which ensures that you’ll be happy with our work.

Ready to enjoy the benefits of new windows without the hassle of DIY? Schedule your appointment with Glass Doctor today.

 

This article is intended for general guidance only and is not applicable to every situation. You are responsible for determining the proper course of action for your property and situation. Glass Doctor is not responsible for any damages that occur as a result of advice and/or guidance derived from its blog content. 

Glass Doctor services may vary by location. For the most accurate guidance, contact the Glass Doctor nearest you for more information and a professional assessment.

Window Replacement FAQs

Glass Doctor has decades of experience with window replacement and repair and can step in when DIY falls short of the professional results you deserve. Whether you have questions about how much to budget or have concerns about the timing of replacing your windows, we have all the answers you need.

How Much Should You Spend on Replacement Windows?

The exact cost of replacing your windows depends on the size, style, and level of energy efficiency you select. On average, you could pay $1,000 and $3,000 per window for installation, but for the most accurate total get a quote from a glass professional that is specific to your home and needs.

How Do I Choose a Good Replacement Window?

When choosing replacement windows, look for options with a high energy efficiency rating to reduce your energy bills and durable materials that can withstand the elements. Don’t forget about the style. With so many designs and finishes to pick from, find a window style that compliments your home.

Is it Cheaper to Replace All Windows at Once?

In many cases, it can be more cost-effective to replace all of your windows at once. Additionally, replacing all of your windows at the same time can help you improve your home's overall energy efficiency and achieve a more consistent look.

What Time of Year is Best to Replace Windows?

The best time to replace the windows in your home depends on where you live. Extreme heat or cold can cause materials like wood, vinyl, and caulk to expand or contract. This can make it difficult to achieve a proper fit and seal. Ensure you’re working on your windows on a day you’re not expecting inclement weather.