Replacing your boat's windows
Replacing your boat's windows

Replacing your boat's windows is crucial for maintaining a safe and comfortable vessel, as old or damaged windows can compromise the structural integrity and create an uncomfortable environment for you and your family.

Replacing Your Boat’s Windows

Sailing the open seas with your family is an incredible experience, but it also requires a well-maintained and safe vessel. One essential aspect of boat maintenance is ensuring that your boat’s windows are in good condition. Over time, windows can become damaged, leaky, or simply outdated, and replacing them can greatly improve your boat’s overall performance and comfort. In this article, we will guide you through the process of replacing your boat’s windows, including the materials and tools you’ll need, the steps to follow, and some helpful tips along the way.

Table of Contents

Why Replace Your Boat’s Windows?

There are several reasons why you might consider replacing your boat’s windows:

  1. Leaks: Over time, the seals around your boat’s windows can deteriorate, leading to water leaks. This can cause damage to your boat’s interior and create an uncomfortable environment for you and your family.

  2. Cracks or Damage: Windows can become cracked or damaged due to various factors, such as impact from debris or stress from the boat’s movement. Damaged windows can compromise the structural integrity of your boat and pose a safety risk.

  3. Condensation: If your boat’s windows are not properly sealed, condensation can form between the panes, reducing visibility and potentially leading to mold and mildew growth.

  4. Aesthetics: Replacing old, worn-out windows can greatly improve the appearance of your boat, making it look more modern and well-maintained.

  5. Energy Efficiency: Newer windows often have better insulation properties, which can help to regulate the temperature inside your boat and reduce energy consumption.

Choosing the Right Materials

When it comes to replacing your boat’s windows, there are several materials to choose from. The most common materials used for boat windows are:

  1. Acrylic (Plexiglass): Acrylic is a popular choice for boat windows due to its lightweight, durable, and UV-resistant properties. It is also relatively easy to work with and can be cut and shaped to fit your boat’s window openings.

  2. Polycarbonate (Lexan): Polycarbonate is another popular choice for boat windows, as it is even stronger and more impact-resistant than acrylic. However, it is also more expensive and can be more difficult to work with.

  3. Tempered Glass: Tempered glass is a strong and durable option for boat windows, but it is also heavier and more expensive than acrylic or polycarbonate. Additionally, tempered glass cannot be cut or shaped after it has been tempered, so it must be ordered in the exact size and shape needed for your boat’s windows.

When choosing a material for your boat’s windows, consider factors such as cost, durability, ease of installation, and the overall look you want to achieve.

Tools You’ll Need

Before you begin the process of replacing your boat’s windows, gather the following tools and materials:

  • Measuring tape
  • Utility knife
  • Straight edge or ruler
  • Marker or pencil
  • Drill and drill bits
  • Jigsaw or circular saw (for cutting the window material)
  • Sandpaper or file (for smoothing edges)
  • Silicone sealant
  • Masking tape
  • Clean cloth and rubbing alcohol (for cleaning surfaces)
  • Screwdriver and screws (if needed for your window installation)

Step-by-Step Guide to Replacing Your Boat’s Windows

Follow these steps to replace your boat’s windows:

Step 1: Measure and Plan

Before you begin, measure the dimensions of your existing windows and the window openings on your boat. Be sure to measure the thickness of the window material as well. Use these measurements to determine the size and shape of the new windows you will need to order or cut.

Step 2: Remove the Old Windows

Carefully remove the old windows from your boat, taking care not to damage the surrounding surfaces. This may involve unscrewing any fasteners or cutting through old sealant with a utility knife.

Step 3: Clean and Prepare the Window Openings

Once the old windows have been removed, clean the window openings thoroughly. Use a clean cloth and rubbing alcohol to remove any dirt, grease, or old sealant residue. This will ensure a strong bond between the new windows and the boat’s surface.

Step 4: Cut the New Windows

If you are using acrylic or polycarbonate material, you can cut the new windows yourself using a jigsaw or circular saw. Be sure to use a fine-toothed blade designed for cutting plastic materials. Use a straight edge or ruler and a marker to draw the cutting lines on the material, then carefully cut along the lines. Smooth any rough edges with sandpaper or a file.

If you are using tempered glass, you will need to order the windows in the exact size and shape needed for your boat’s window openings.

Step 5: Dry Fit the New Windows

Before applying any sealant, dry fit the new windows in the window openings to ensure they fit properly. Make any necessary adjustments to the window size or shape at this stage.

Step 6: Apply Sealant

Apply a generous bead of silicone sealant around the perimeter of the window opening, ensuring that there are no gaps or voids in the sealant. This will create a watertight seal between the window and the boat’s surface.

Step 7: Install the New Windows

Carefully place the new windows into the window openings, pressing firmly to ensure a good bond with the sealant. Use masking tape to hold the windows in place while the sealant cures, which can take up to 24 hours.

Step 8: Secure the Windows (if necessary)

If your boat’s windows require additional fasteners, such as screws or bolts, install them once the sealant has cured. Be sure to use stainless steel or marine-grade hardware to prevent corrosion.

Tips for a Successful Window Replacement

  • Take your time and be patient throughout the process. Replacing your boat’s windows can be a challenging project, but the end result will be well worth the effort.
  • Always wear safety glasses and gloves when working with tools and materials.
  • If you are unsure about any aspect of the window replacement process, consult a professional or experienced boater for advice.
  • Regularly inspect your boat’s windows for signs of wear or damage, and address any issues promptly to maintain the safety and integrity of your vessel.


Replacing your boat’s windows is an important aspect of boat maintenance that can greatly improve the performance, comfort, and appearance of your vessel. By following the steps outlined in this guide and using the appropriate materials and tools, you can successfully replace your boat’s windows and continue to enjoy your sailing adventures with your family.