How to Replace Windows Around Doors: A Step-by-Step Guide


Replacing windows around doors may seem daunting, but with the right guidance, it’s a manageable DIY project that can improve your home’s energy efficiency, curb appeal, and overall comfort. Whether you’re upgrading old, drafty windows or installing new ones to complement your entryway, this guide will walk you through every step.

Why Replace Windows Around Doors?

Windows near doors often experience more wear and tear due to exposure to weather and daily use. Replacing them can:

  • Improve energy efficiency: Modern windows reduce heat loss, lowering your energy bills.

  • Enhance security: New windows are harder to break, keeping your home safer.

  • Boost aesthetics: Updated frames and glass styles elevate your front entrance.

  • Increase home value: Buyers often value updated windows, especially around key entry points.

If your windows are drafty, cracked, or outdated, replacing them is a smart investment.

Tools and Materials You’ll Need

Before you begin, gather these essentials:

  • Measuring tape

  • Screwdriver or drill

  • Pry bar

  • Utility knife

  • Caulk gun and exterior-grade caulk

  • Shims

  • Level

  • New window unit (make sure it fits the opening)

  • Safety glasses and gloves

Having all materials ready ensures a smooth installation process.

Step 1: Measure the Existing Window

Accurate measurements are critical. Measure:

  • Width: Measure at the top, middle, and bottom of the window frame. Use the smallest measurement.

  • Height: Measure on the left, middle, and right sides. Again, use the smallest measurement.

  • Depth: Measure the thickness of the window frame to ensure your new window will fit properly.

Proper measurements prevent costly mistakes and ensure a snug fit.

Step 2: Remove the Old Window

  1. Remove interior trim carefully with a pry bar.

  2. Unscrew or pry out the old sash or frame.

  3. Clean the opening of debris, nails, and old caulk.

Be careful not to damage the door frame while removing the window. Using safety glasses is essential to avoid injury from broken glass or splinters.

Step 3: Prepare the Window Opening

Before installing the new window:

  • Check for damage: Look for rot or water damage around the frame. Replace damaged wood if needed.

  • Apply flashing tape: This helps prevent water infiltration.

  • Dry-fit the window: Place the new window in the opening to ensure it fits properly before sealing.

A well-prepared opening ensures the longevity of your new window.

Step 4: Install the New Window

  1. Place the window in the opening carefully.

  2. Use shims to level it from top to bottom. Check with a level horizontally and vertically.

  3. Secure the window with screws or nails as recommended by the manufacturer.

  4. Insulate around the frame with low-expansion spray foam or fiberglass insulation.

Ensuring the window is level and secure is essential to prevent leaks and operational issues.

Step 5: Seal and Finish

  1. Apply exterior caulk around the edges to prevent water penetration.

  2. Reinstall interior trim or add new trim for a fresh look.

  3. Test the window by opening and closing it to confirm smooth operation.

Proper sealing keeps your home energy-efficient and protects against drafts and water damage.

Tips for a Successful Window Replacement

  • Consider energy-efficient windows: Look for ENERGY STAR-rated units for long-term savings.

  • Match the style to your door: Choose materials and finishes that complement your entryway.

  • Hire a professional if unsure: Complex installations, like bay windows or windows with unusual dimensions, may require expert help.

  • Plan for seasonal changes: Avoid extreme weather for window replacement to reduce risks of warping or seal failure.

Common Mistakes to Avoid

  • Incorrect measurements leading to gaps or poor fit.

  • Failing to check for water damage before installation.

  • Skipping the leveling process, causing operational problems.

  • Using the wrong caulk or insulation type, leading to leaks.

Avoiding these mistakes ensures your new windows last for decades.

Final Thoughts

Replacing windows around doors is a DIY-friendly project that adds beauty, functionality, and energy efficiency to your home. With careful preparation, accurate measurements, and attention to detail, you can achieve professional-quality results without hiring a contractor. Updated windows not only enhance your comfort but also contribute to your home’s resale value.

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