Introduction

You've decided on custom outdoor curtains and are looking forward to your perfect, private retreat. But before you begin, the most important step is accurate measurement. Even an error of just one centimeter can result in curtains that don't reach the floor or leave unsightly gaps. This comprehensive guide will walk you through each measurement point, highlight common mistakes, and explain how to precisely measure curtains with complex shapes. If you have any further questions, BTTO offers a free guided measurement service.

The 3 Most Common Measurement Mistakes – And How to Avoid Them

Before you grab your tape measure, please take a look at the mistakes we most commonly see at BTTO:

Mistake 1: Measuring in only one spot – Walls and floors are rarely perfectly straight. Always measure at at least three points (left, center, right) and use the smallest measurement as your basis. This prevents the curtain from getting snagged somewhere or being too short.

Mistake 2: Not accounting for curtain hanging system – Whether you use grommets, loops, or a track affects the effective height. With a rod and rings, the fabric height begins below the ring; with a track, the curtain hangs directly underneath. Precisely plan the distance between the attachment point and the desired bottom finish.

Mistake 3: Not calculating for fullness – If your curtain isn't meant to be stretched flat, but rather to show decorative waves, you'll need additional width. Rule of thumb: For light draping, add about 20-30% more fabric width. Our BTTO consulting team will help you determine the perfect fullness factor.

Tools You'll Need for Measuring

• A sturdy metal tape measure (at least 5 m, ideally 8 m), not a loose fabric tape measure, as it can sag.
• A laser distance meter (optional, but extremely helpful for large areas).
• A spirit level to align the mounting points vertically.
• Painter's tape to mark the measurement points on the wall or floor.
• Notepad and camera – document each measurement with a photo marking the spot. This way, you can discuss everything with us later.

Step-by-Step Guide: Measuring a Standard Rectangle

The most common shape for outdoor curtains on patios or balconies is a simple rectangular opening. Proceed as follows:

Step 1 – Measure Width

Measure the width at three points: directly below the ceiling (or lintel), in the middle of the height, and at the floor, if the curtain is meant to reach the floor. Note all values and use the smallest width measurement. If the difference is very large (more than 2 cm), we recommend a curtain with a straight, finishing hem that conceals minor unevenness.

Step 2 – Measure Height

Measure the height on the left, in the middle, and on the right. Again, the smallest measurement is crucial. Decide beforehand whether the curtain should rest on the floor (then measure from the attachment point to the floor and subtract 1-2 cm for clearance) or end free-floating (enter the final measurement directly).

Step 3 – Mark Attachment Points

Determine exactly where the curtain rod or track will be mounted. For an aesthetically optimal effect, we recommend that the hanging system extends approximately 15-20 cm above the window or door opening and at least 20 cm to the side beyond the opening. This prevents side light gaps and makes the room appear larger. Mark these points with painter's tape.

Summary & Next Step

You've done it! Thanks to the correct measurement methods, the right tools, and avoiding three common mistakes, you can now precisely measure the dimensions of a standard patio or balcony opening. Note the width and height (always the smaller measurement) and mark the anchor points. This data forms the basis for your individual BTTO solution.

But what if your situation is more complex? For example, a sloping conservatory wall, a balcony railing with an overhang, or a door opening that needs protection from drafts? In this case, we recommend reading Part 2 of this guide. We'll show you how to measure complex geometries with millimeter precision and introduce you to BTTO's free, professionally guided measurement service – for a completely worry-free project.

[Button: Continue to Part 2: Special Cases & BTTO Measurement Service →]
[Textlink: Configure Custom Outdoor Curtains Now]