Bay Window Curtain Pole – How To Measure, Choose & Install

Bay windows add character and light to a room, but dressing them can be a puzzle. A standard straight curtain pole will not work around the angles of a projecting bay. The solution is a bay window curtain pole, a specifically designed system with bends and connectors that lets curtains run smoothly around each corner. Finding the right pole requires understanding your window’s shape, taking accurate measurements, and choosing materials that match your curtains and decor.

For anyone tackling this job, getting the fit right from the start saves time and money. The most critical step is measurement, as bay windows come in several configurations, from simple L-shapes to more complex five-sided designs. This guide covers how to measure your window, the different types of poles available, and what to look for during installation.

How to Measure a Bay Window for a Curtain Pole

• Measurement is the most critical step – bay windows have angles that require specific pole lengths and bends.
• Three-sided and L-shaped poles are the most common, but custom bends are available for irregular bays.
• Bracket placement determines stability – typically one bracket per joint plus one per 1m of straight run.
• Pole material affects both aesthetics and weight capacity; wooden poles may need extra support for heavy curtains.
• Telescopic poles offer adjustability but may have a visible joint; custom fixed poles offer a cleaner look.

Step 1: Check the space above the window

Before measuring the bay itself, check how much space exists between the top of the window frame and the ceiling. According to the B&Q guide, if this distance is 15 cm or more, you can typically use either wall or ceiling brackets. If it is less than 15 cm, ceiling brackets may be the only option to secure the pole properly.

Step 2: Measure each straight section of the bay

Using a metal tape measure, measure each side of the bay from one inside corner to the next. Record each measurement in centimetres. For the first and last sections where the curtains will draw back, add 20 to 30 cm to allow the fabric to clear the window glass completely.

Step 3: Calculate total width and confirm the angles

Add the lengths of all sections together to get the total width needed. This helps when selecting a kit or ordering cut lengths. You also need to confirm the bay shape. Angles are typically 90 degrees for a square or boxed bay, or around 45 degrees for a splayed bay. Knowing the exact number of sides and the angle of each corner is essential before ordering.

Step 4: Determine the curtain drop

Decide where you want the curtains to finish. Common options include just above the floor, grazing the floor, or a few inches above the floor. Measure from the intended pole position to that finish point. This ensures your curtains are the correct length before you purchase them.

Types of Bay Window Curtain Poles: Which One is Best?

Three-sided bay window poles

The most common configuration is the three-sided bay pole. It is designed to fit windows that project outward with one central pane and two angled side panes. Within this category, there are two subtypes. Square or boxed bays have side sections that meet the centre at 90 degrees. Splayed bays have sections meeting at approximately 45 degrees, creating a gentler curve. The Curtain Pole Store provides guidance on both types.

L-shaped bay window poles

For windows that wrap around a single corner, such as in a dining area or a small extension, an L-shaped or two-sided bay pole is used. These have a single angled joint and are simpler to install than three-sided systems.

Five-sided and custom bendable poles

More complex bay windows, often found in larger period homes, may have five sides. These require poles with multiple joints and connectors. For irregular angles that do not fit standard 45- or 90-degree joints, custom bendable poles are available. Some manufacturers, like those featured on Made by the Forge, offer handcrafted wrought iron poles made to exact specifications. Alternatively, bendable curtain tracks can be shaped by hand to follow almost any curve, though these are less decorative than rigid poles.

Do bay window curtain poles need special connectors?

Yes. Standard straight poles cannot navigate corners. Bay window curtain poles rely on specific corner joints, also called connectors, that lock the pole sections together at the correct angle. Without these connectors, the system would not hold together or allow curtains to pass smoothly around the bay.

Choosing the Right Material and Design for Your Bay Window Pole

Metal and wrought iron poles

Metal poles, including steel, aluminium, and wrought iron, are the most durable options. Wrought iron, often handcrafted, offers the highest strength and is suitable for very heavy curtains. The Curtain Pole Store indicates that 28 mm diameter poles can support curtains up to approximately 11 kg. For heavier drapes, a 35 mm pole is recommended to prevent sagging.

Wooden poles

Wooden poles suit traditional and classic interiors. They can be painted or stained to match the room. However, wood is generally less strong than metal. For wide bay windows or heavy curtains, wooden poles may require additional centre support brackets to prevent bowing over time.

Can I use a straight pole for a bay window?

A single straight pole cannot follow the angles of a bay window. However, a straight pole can be used if it is combined with a set of corner connectors. In this case, multiple straight sections are joined at the correct angles using these connectors. For simple two-sided or three-sided bays, this is a common approach.

How Many Brackets Do I Need and How to Install

Bracket placement directly affects the stability of the pole. As a general rule, you need one bracket at each corner joint, plus one bracket for every meter of straight pole section. For a three-sided bay, this often means five brackets: one at each corner and one in the centre of each straight run. Installation videos show that brackets must be kept level using a spirit level or laser level, and fitting often begins with the centre bracket to establish the horizontal line.

The number of sides determines the hardware needed. B&Q notes that a three-sided angled bay may require one 2.5 m pole plus two 1.5 m poles cut to length, along with five wall or ceiling brackets. Accurate bracket spacing is important; one example from a video guide shows brackets placed approximately 10 cm from the ends of a specific setup.

Installation Timeline for a Bay Window Curtain Pole

1. Measure the bay window and confirm angles (approximately 30 minutes).
2. Choose pole type, material, and size, then order (1 to 7 days for delivery).
3. Gather required tools: tape measure, drill, bits, screwdriver, spirit level, wall plugs, and brackets.
4. Mark bracket positions, drill holes, insert plugs, and fix brackets in place (1 to 2 hours).
5. Assemble pole sections, corner joints, and finials, then place onto brackets (approximately 30 minutes).
6. Hang curtains and test smooth movement through the bends (approximately 15 minutes).

What is Certain and What is Uncertain When Choosing a Pole

If you are unsure about your wall type or the exact angles of your bay, consulting a professional fitter is recommended before drilling.

What Makes a Bay Window Curtain Pole Different

Bay window curtain poles differ from straight poles because they must navigate corners and angles. The key factors include the number of sides (2, 3, or 5), the angle of each corner (typically 90° or 135°), and the overall projection from the wall. Retailers offer pre-formed jointed poles with rigid angles, as well as flexible tracks that can be bent on site. Rigid poles remain more common for classic curtain styles.

Expert Advice and Industry Sources

“The most common mistake is underestimating the number of brackets needed for a bay window pole.”

— DIY.com guide

Industry standards for pole diameters and weight ratings are provided by the British Blind and Curtain Association. For custom specifications, specialist manufacturers like Made by the Forge offer tailored solutions.

Next Steps After Choosing Your Pole

Once your pole is installed, consider adding curtain pole rings, finials, and tie-backs to complete the look. If using heavy drapes, invest in wall fixings appropriate for your wall type, whether plasterboard or brick. For non-standard bay shapes, request a custom quote from a specialist manufacturer. Start with accurate measurements of your bay using a guide on how to measure a bay window curtain pole.

Frequently Asked Questions