How to Measure a Patio Door

If you have an old patio door, it could be time to replace it. Getting accurate measurements is key to finding the perfect replacement door. Apex Window Werks offers step-by-step instructions on how to measure a patio door.

Necessary Tools and Equipment for Measuring

Measuring a patio door properly requires having the right tools on hand. Here are the essential items you’ll need:

• Steel measuring tape: Get a steel measuring tape that extends to at least 25 feet for accurate measurements across large openings.
• Pencil and paper: Have these ready to mark down the measurements as you take them.
• Level: A basic level helps you determine if the floor or door frame is perfectly straight.
• Screwdriver: You may need a screwdriver to remove any molding or hardware to access the actual door frame.
• Digital measuring device (optional): Modern laser measures can provide more precise readings for wall thickness and depth measurements.
• Step ladder: If the door opening is high up, use a sturdy step ladder to reach the top points you need to measure.

These basic tools will make the measuring process much easier and more accurate when sizing replacement patio doors.

Measuring French Patio Doors

Hinged patio doors, also called French doors, require specific measurements for proper fit. If needed, have an assistant, such as a friend or family member, help hold the tape measure steady across large openings. Use a pencil to mark measurements before recording them.

Step 1: Measure Width and Height

Start with the basic opening dimensions to determine your rough opening size.

• Opening width: Measure across the door frame from inside edge to inside edge at the top, middle, and bottom. Use the smallest width measurement.
• Opening height: Measure from the bottom of the door sill up to the header at three points across the opening. Use the shortest height.

Step 2: Check Frame and Door Details

Examine the existing door configuration and wall structure for proper sizing.

• Door panels: Measure each existing door panel from top edge to bottom edge.
• Wall thickness: Measure the depth of the door jamb where it meets the wall.
• Door overlap: Note how much space the door needs when opened fully.
• Door swing direction: Record which way each door panel swings.

Step 3: Verify Square and Level

Check the structural integrity of your door opening before ordering replacement doors.

• Use a level to check that the sides are perfectly vertical.
• Check the floor for level across the opening.
• Measure any molding or trim width around the door frame.

Accurately measuring for hinged patio and French doors ensures your new doors will fit the opening properly.

Measuring Sliding Glass Doors

Sliding glass doors, sometimes called sliding patio doors, have some unique points to measure compared to hinged doors.

Step 1: Measure the Door Opening

Begin by determining the exact opening dimensions for your sliding glass door replacement.

• Opening width: Measure the full width of the door opening at the top, middle, and bottom. Always use the narrowest width for a proper fit.
• Opening height: Measure from the bottom of the door sill up to the header at multiple points.

Step 2: Assess Door Panels and Track

Evaluate the current door configuration and track system for replacement planning.

• Existing door size: Measure current sliding door panels to determine replacement size.
• Door track condition: Check if the bottom door track is level and note any damage.
• Panel configuration: Note how many panels your sliding glass patio door has — some are two-panel doors, while others are three-panel doors.

Step 3: Frame and Space Considerations

Consider the structural elements and clearance requirements for proper installation.

• Available space: Check the total width and height of the rough opening.
• Frame recess: Measure the distance from the door surface to the outer wall surface.
• Extra inches: Allow for proper installation clearance in your measurements.

Be sure to measure the opening from multiple points at the top, middle, and bottom to account for any inconsistencies. Having a precise opening size ensures your new sliding patio door fits perfectly.

Reasons to Call a Professional Door Installer

While homeowners can handle basic measurements, professional installation often provides the best results. Consider professional help when:

• You need custom door solutions for unusual opening sizes.
• Your home has multiple stories requiring upper-level door replacement.
• The installation involves complex structural modifications or trim work.
• You want warranty protection and a guaranteed proper fit.

Professional installers have specialized tools and expertise to ensure your new door operates smoothly and provides maximum energy efficiency. Apex Window Werks‘ experienced professionals handle any necessary adjustments or repairs and install your replacement patio door. We proudly serve Illinois, Wisconsin, Minnesota, and Ohio.

Get Expert Sliding Door Replacement with Apex Window Werks

Measuring your patio door is the first step toward a successful replacement. A precise measurement is key to finding a door that not only looks great, but also works efficiently.

When you’re ready to move forward, let the experienced team at Apex Window Werks take over. We’ll ensure your new patio door is installed correctly the first time. Contact us today to schedule a free estimate to see how we can help!