When it comes to installing window shutters, the first and most important step is getting the measurements right. Accurate measurements make sure your shutters fit well, look great, and work properly. If you skip this step or do it wrong, you could end up with shutters that don’t close all the way, leave gaps, or simply don’t look good on your windows. This guide is here to help you measure your windows correctly, whether you’re doing it yourself or preparing for a professional install. Even though it may seem like a simple task, proper measuring involves a few important details that you shouldn’t overlook.
Decide on the Type of Mount: Inside or Outside
Before you take out your measuring tape, you need to know whether your shutters will be installed inside the window frame or on the wall around the window.
- Inside mount shutters fit within the frame, giving a clean and built-in look. They work best when your window frame is deep enough to support the shutter frame and allow for full louver movement. This type is ideal for modern homes that emphasize clean lines and minimalism.
- Outside mount shutters are installed on the wall or trim surrounding the window. These are a good choice for shallow frames or windows that aren’t perfectly square. They also help block out more light and can make a window appear larger.
Knowing which mount style you want will determine how you take your measurements, so don’t skip this step. Take a good look at your windows and consider their depth, shape, and surrounding wall space.
Tools You’ll Need
Before you start measuring, gather the right tools. Using the proper tools ensures your measurements are accurate and consistent.
- A metal tape measure (more accurate than cloth or plastic versions)
- A pencil and notebook or a smartphone/tablet to record your measurements
- A ladder or step stool if your windows are high or large
- A level (optional but useful to check if your window frame is square)
- A flashlight if the window area is dimly lit
- A measuring assistant (another person can help you hold the tape, especially on larger windows)
Don’t underestimate how helpful it can be to write down each measurement immediately. Even a small mix-up can lead to a costly mistake later.
Measuring for Inside Mount Shutters
If you’ve decided on inside mount shutters, follow these steps for accurate measurements:
Step 1: Measure the Width
Use your tape measure to record the width of the window opening in three different places: top, middle, and bottom. Walls and frames can shift over time, so each part might be slightly different. Always record the narrowest width to ensure your shutters fit properly inside the opening.
Step 2: Measure the Height
Repeat the process for height. Measure on the left side, center, and right side of the window opening. Write down all three, and again, use the shortest height for your order. This will help the shutters sit flush without being too tall.
Step 3: Check the Window Depth
Use your tape measure to determine how deep the window frame is. This is important because your shutters need enough depth to sit inside the frame without bumping into the glass or hardware. Most shutters require at least 2 to 3 inches of depth, but this may vary depending on the style you choose.
Extra Tip: If you notice any obstructions inside the frame, like handles, locks, or cranks, take note of them and factor them into your decision.
Measuring for Outside Mount Shutters
Outside mount shutters offer more flexibility, especially if your windows are uneven or lack enough depth. Here’s how to get those measurements right:
Step 1: Measure the Total Coverage Area
Unlike inside mounts, you’ll measure beyond the window frame. Typically, you’ll want to add 2 to 3 inches of coverage on each side (top, bottom, left, and right). This helps block out more light and gives your shutters a bold frame look.
Step 2: Decide Where the Shutter Frame Will Sit
Will it rest on the window trim? Above it? On the wall? Make that decision before measuring, as it affects the dimensions. Mark out the ideal spot and then measure the full width and height of that area.
Step 3: Account for Nearby Structures
Look for obstacles like crown molding, outlets, nearby furniture, or even cabinetry that might block the shutter frame. Jot these down and adjust the installation zone if needed.
Pro Tip: If you’re installing shutters in a high-traffic area like a kitchen or hallway, check to make sure there’s enough clearance for opening and closing the panels comfortably.
Measuring for Special Window Shapes
Some windows aren’t standard rectangles. That’s okay! Many shutters can be custom-made to fit different shapes, but measuring them takes a little more attention.
- Arched or Eyebrow Windows: Trace the shape on a large sheet of paper or cardboard and provide a template to the manufacturer. Still measure the base width and the height from the base to the arch peak.
- Bay or Bow Windows: Measure each section individually. Take extra care to record the angles between panels and the exact width of each one.
- French or Sliding Doors: Measure both width and height of each door panel. Be sure to leave room for the handles, locks, or any trim.
Custom shapes may have different instructions depending on the manufacturer, so check for specific guides or request professional help if unsure.
Make Sure the Window is Square
Even windows that look perfectly rectangular might be off by a bit. Here’s how to check:
- Measure from the top left corner to the bottom right corner.
- Then, measure from the top right to the bottom left.
- Compare the two measurements. If they’re the same, your window is square. If not, there’s a slight angle to account for.
That’s not a deal-breaker. Most shutter providers can adjust the frame slightly to accommodate out-of-square windows, but they need to know in advance.
Common Mistakes to Avoid
Measuring shutters isn’t hard, but it does require care. Avoid these common missteps:
- Guessing or rounding off numbers: Always use exact measurements, down to 1/8 inch.
- Measuring just once: Always double-check to catch mistakes.
- Measuring just one window and assuming all are the same: Every window should be measured individually.
- Ignoring obstacles: Handles, locks, and nearby trim can affect installation.
- Not labeling your measurements clearly: Note which number is width vs height, and which window it belongs to.
Should You Measure Yourself or Call a Pro?
If you’re confident, measuring your windows can be a satisfying DIY task. But not all windows are easy to measure. Here’s when to consider calling in a pro:
- Your windows are extra large or unusually shaped
- You’re investing in high-end, custom shutters
- You want to ensure 100% accuracy
- You don’t feel confident doing it on your own
Many shutter companies offer free in-home consultations or measuring services. If they do, it’s often worth taking advantage of it for peace of mind.
Final Thoughts
Measuring for window shutters is all about precision and preparation. When done right, your shutters will fit like a glove, operate smoothly, and enhance the look of any room. From choosing your mount type to double-checking your numbers, every step matters. Taking a little extra time now ensures you won’t face frustration during installation later.
If you have tricky windows, aren’t sure what mounting style works best, or just want help making the right choice, don’t hesitate to reach out.
Need help getting started? Contact a local shutter expert or visit your nearby bluechip shutters and blinds for personalized guidance and professional support. Whether you measure yourself or get help, the goal is the same: shutters that fit beautifully and last for years.
