Curtain Poles

How to Measure for Wrought Iron Curtain Poles: The Complete UK Measuring Guide

Choosing beautiful curtains is only part of creating a polished window treatment. The curtain pole underneath them must also have the correct length, diameter, support and position. A pole that is too short can restrict the curtains and block valuable daylight. A pole that is too long can look unbalanced and may require unnecessary support. This is particularly important when selecting wrought iron curtain poles. A quality iron pole can provide both practical support and a distinctive decorative finish. Correct measurements also help determine the right curtain pole brackets, curtain pole rings, finials and support points before installation. If you are looking for a complete solution, SG Wrought Iron offers a range of wrought iron curtain pole sets in different styles. The current collection includes the Premium 16mm Solid Wrought Iron Curtain Pole Set with Scroll Finials – Smithy Matt Black, Premium Black Double Wrought Iron Curtain Pole Set with Rings & Fittings, and several other 16mm designs with decorative finials. Why Accurate Curtain Pole Measurements Matter A curtain pole measuring guide should consider more than the width of the glass. The usable pole length determines where curtains stack when opened, while the pole diameter affects the overall appearance and its suitability for different curtain weights. For a standard outside-the-recess installation, extending the pole beyond the window on both sides gives curtains additional space to stack when open. The exact extension depends on the available wall space, curtain fullness and the appearance you want to achieve. For example: Window width: 150cmLeft extension: 15cmRight extension: 15cmRequired working pole length: 180cm The decorative finials may add additional overall width, so they should not automatically be included when calculating the working length. For curtain poles for large windows or curtain poles for wide windows, additional stack-back space may be required. Heavier or fuller curtains can also need more room because the gathered fabric occupies more space at each side. Step 1: Measure the Window Width The first stage in learning how to measure for curtain poles is to establish the width of the window. Use a reliable metal tape measure and measure from one outer edge of the window area to the other. If the window is inside a recess, take measurements at the point where the curtain pole will actually be positioned. For greater accuracy, take the measurement in at least three places: Near the top Across the middle Near the bottom Choosing a Pole After Measuring Once you know the required length, you can compare it with the available SG Wrought Iron pole sets. For example, the Premium 16mm Solid Wrought Iron Curtain Pole Set – Smithy Matt Black provides a simple matt-black design, while the Premium 16mm Solid Wrought Iron Curtain Pole Set with Scroll Finials – Smithy Matt Black adds a more decorative finish. This makes it easier to select a pole according to both your measurements and the interior style of your room. Step 2: Decide How Far the Pole Should Extend One of the most frequently asked questions is: how far should the curtain pole extend past the window? For many standard windows, an extension of approximately 15cm on each side is a useful starting point. However, wider extensions can be beneficial where there is enough wall space. The additional length allows curtains to move beyond the glass when they are opened. This can improve daylight and make the window appear wider. A typical calculation is: Window width + left extension + right extension = curtain pole length For example, if a window measures 180cm and the chosen extension is 20cm per side: 180cm + 20cm + 20cm = 220cm The required working length is therefore approximately 220cm. Step 3: Decide Where to Position the Curtain Pole Knowing where to position curtain pole hardware is just as important as measuring its width. Many installations position the pole above the window to create sufficient curtain clearance. The exact position depends on the room, window architecture, curtain drop and available wall space. A higher pole can create the visual impression of a taller window. It can also provide additional clearance for curtain headings and decorative hardware. Before drilling, check: The location of the window frame The ceiling height Radiators and other obstructions Curtain drop Bracket projection Lintel or masonry position The chosen finials Step 4: Choose the Correct Curtain Pole Diameter The curtain pole diameter affects both strength and appearance. Common options include: 16mm curtain poles - suitable for many lighter curtain applications 19mm curtain poles - useful for light-to-medium curtain weights 25mm curtain poles - suitable where a stronger, more substantial appearance is required 28mm curtain poles - often selected for heavier curtains and larger installations The exact suitability depends on the pole material, construction, bracket design, length and curtain weight. Therefore, what size curtain pole do I need? is not answered by window width alone. A long pole supporting thick, lined curtains may require a larger diameter and additional support even if the window itself is relatively narrow. For curtain poles for heavy curtains, the entire system should be considered rather than simply choosing the thickest available pole. A 16mm Wrought Iron Option If your curtains and window size suit a 16mm design, SG Wrought Iron currently offers several decorative options. The Premium 16mm Solid Wrought Iron Curtain Pole Set with Acorn Finials – Smithy Matt Black provides a traditional decorative appearance. The Premium 16mm Solid Wrought Iron Curtain Pole Set with Button Finials – Smithy Matt Black offers a simpler rounded finial style. There is also a Premium 16mm Solid Wrought Iron Curtain Pole Set with Church Cross Finials – Smithy Matt Black for customers looking for a more distinctive traditional detail. Choosing between these styles allows homeowners to match the hardware to the character of the room without changing the basic measuring process. Step 5: Select the Right Pole Type Once the basic dimensions are established, the next question is: what type of curtain pole do I need? The answer depends on the window, curtain heading, room style and installation method. Fixed Curtain Poles Fixed curtain poles provide a straightforward, permanent installation. They are suitable when the required length is known and the pole is intended to remain at that dimension. For homeowners who prefer a coordinated look, a complete wrought iron pole set can be more convenient than buying every component separately. Extendable Curtain Poles Extendable curtain poles can adjust within a specified range. They can be useful for standard windows where exact measurements are less critical. However, for a premium period-style interior or a precise architectural installation, made to measure curtain poles can provide a more tailored solution. Single Curtain Poles Single curtain poles are designed for one curtain layer. They are suitable for many standard curtains, including eyelet and tab-top styles. A single pole can also be an effective choice when you want the wrought iron hardware itself to become part of the room's decorative appearance. Double Curtain Poles Double curtain poles allow two layers of curtains, such as a sheer curtain with a heavier decorative curtain. SG Wrought Iron currently offers a Premium Black Double Wrought Iron Curtain Pole Set with Rings & Fittings. This can be considered where a two-layer window treatment is required and the additional depth of a double-pole system can be accommodated. Recessed Curtain Poles A recess curtain pole is installed within the window recess. This option can create a clean architectural appearance, but measurements need to be particularly accurate. If the recess varies in width, measure at the exact point where the pole will be installed rather than relying on a single measurement taken elsewhere. Measuring for Different Curtain Headings The curtain heading should be decided before purchasing the hardware because different curtain styles interact with poles differently. Eyelet Curtain Poles Eyelet curtain poles are designed for curtains that pass directly over the pole through their eyelets. A pole with an appropriate diameter and projection should be selected. The curtain eyelets must move freely without catching on the wall, brackets or finials. Pencil Pleat Curtain Poles Pencil pleat curtain poles normally use curtain rings. The curtain hooks attach to the eyes underneath the curtain pole rings. When measuring the curtain drop, the starting point should reflect the actual hanging point rather than simply the top of the decorative pole. Tab Top Curtain Poles Tab top curtain poles allow fabric tabs to pass directly over the pole. The pole diameter and decorative finish become especially visible, making the choice of decorative curtain poles important. Wave Curtains Wave curtain poles require more careful consideration because wave headings are normally associated with specialised track systems rather than traditional ringed poles. The hardware should therefore be confirmed before ordering the curtains. Measuring Recessed Curtain Poles Measuring a recessed installation requires more precision than a standard wall-mounted fitting. Measure the recess at the exact height where the pole will sit. Do not assume the recess is identical from top to bottom. Older walls can vary by several millimetres. A small difference may matter when a pole is designed to fit tightly between two walls. For this reason, a recessed curtain pole should be measured carefully in millimetres. The installer should also account for: Bracket depth Pole diameter Finial design Curtain clearance Wall irregularities Required fitting tolerance Measuring Bay Windows Bay window curtain poles require a different approach because the window is not a single straight opening. For curtain poles for bay windows, each section of the bay should be measured separately. The angles, corners, wall returns and available fixing points should be recorded. Before ordering, consider: The width of each bay section. The angle between sections. Where curtains need to stack. Where brackets can be fixed. Whether the curtains need to travel around corners. Whether a specialist pole or track system is more suitable. How to Install Curtain Poles Correctly Once the measurements are confirmed, curtain pole installation should be approached carefully. Mark the bracket positions using the final pole measurement. Use a spirit level to ensure the installation is straight. Check the wall construction before selecting screws and wall plugs. The basic how to fit curtain poles process is: Mark the desired height. Mark the left and right bracket positions. Check the level across the window. Locate suitable fixing points. Install the brackets securely. Add the centre support where required. Position the pole. Secure the pole to the brackets. Add rings and curtains. Check that the curtains move freely. Common Measuring Mistakes to Avoid Even a high-quality pole can look poor when the measurement is incorrect. Common mistakes include measuring only the glass, forgetting the finials, ignoring curtain stack-back space, selecting an unsuitable diameter and positioning brackets where they interfere with curtain movement. The most important errors to avoid are: Measuring only the window glass: The pole normally needs to extend beyond the opening. Including finials in the working pole measurement: The curtain usually travels along the usable pole section rather than the decorative finials. Ignoring curtain weight: Heavy curtains need appropriate pole diameter and support. Using insufficient brackets: Long installations can require centre or additional support. Ignoring curtain heading: Eyelet, pencil pleat and tab-top curtains require different measurements and hardware. Failing to check obstructions: Radiators, handles, deep window boards and adjacent walls can affect the installation. A Simple Curtain Pole Measurement Formula For a standard wall-mounted installation, the following formula provides a useful starting point: Curtain Pole Length = Window Width + Left Extension + Right Extension Example: Window: 200cmLeft extension: 20cmRight extension: 20cmWorking pole length = 240cm Before You Order Your Wrought Iron Pole Once you have calculated the required length, check these points before purchasing: Window or recess width Required left and right extension Curtain weight Curtain heading Pole diameter Bracket quantity Finial style Wall or ceiling fixing position Required accessories Single or double pole requirements Explore Wrought Iron Curtain Poles from SG Wrought Iron After measuring, the next stage is choosing a pole that matches your window and interior. SG Wrought Iron currently offers a dedicated collection of wrought iron curtain poles designed around traditional, decorative and practical window treatments. The collection includes six curtain-pole products, with options ranging from individual 16mm solid wrought iron pole sets to a double wrought iron pole set with rings and fittings. Some of the options include: Premium 16mm Solid Wrought Iron Curtain Pole Set with Acorn Finials – Smithy Matt Black Premium 16mm Solid Wrought Iron Curtain Pole Set with Button Finials – Smithy Matt Black Premium 16mm Solid Wrought Iron Curtain Pole Set with Church Cross Finials – Smithy Matt Black Premium Black Double Wrought Iron Curtain Pole Set with Rings & Fittings Where to Buy Wrought Iron Curtain Poles in the UK After measuring, the next stage is selecting a supplier capable of providing the appropriate pole, brackets, rings and finishing accessories. SG Wrought Iron specialises in wrought iron curtain hardware, with its current collection covering curtain poles, brackets, recessed products, double rails, curtain rings and tie backs. For homeowners looking for a traditional black iron finish, the Smithy Matt Black collection provides several finial designs. This allows the same basic pole style to be adapted to different interior themes. Before ordering, always compare your measurements with the product dimensions and options available. If you are fitting heavy curtains or working with an unusually wide, recessed or bay window, the pole diameter, bracket arrangement and support requirements deserve particular attention. Conclusion Accurate measurement is the foundation of a successful curtain pole installation. The correct curtain pole length, diameter, bracket position and extension can improve both the practical performance and visual proportion of the finished window. For standard windows, the process is relatively simple: measure the window, add suitable space to both sides, decide the installation height and select hardware capable of supporting the curtains. More complicated projects, including bay windows, recessed installations and extra-long poles, require greater precision. For homeowners seeking a distinctive, durable and traditional finish, wrought iron curtain poles can provide an attractive alternative to less decorative hardware. Before you buy, measure carefully, consider your curtain weight and choose the pole diameter, finial style and accessories that suit your window. Explore SG Wrought Iron Curtain Poles Frequently Asked Questions 1. How do you measure wrought iron curtain poles? Measure the full width of the window or recess, then decide how far the wrought iron curtain pole should extend beyond each side. For a standard wall-mounted installation, around 15–20cm on each side can be a useful starting point. The final measurement should also account for curtain stack-back, brackets and finials. 2. How long should a curtain pole be compared with the window? The curtain pole length should normally be wider than the window so the curtains can move beyond the glass when opened. A common calculation is the window width plus approximately 15–20cm on each side. Larger extensions may be appropriate when there is sufficient wall space and maximum daylight or stack-back is required. 3. What size diameter curtain pole is best for heavy curtains? The appropriate curtain pole diameter depends on the curtain weight, pole length, material and bracket support. Common options include 16mm, 19mm, 25mm and 28mm poles. For curtain poles for heavy curtains, a larger diameter combined with suitable brackets and centre supports may provide greater stability. 4. How many brackets are needed for a curtain pole? The number of curtain pole brackets depends on the pole length and the weight of the curtains. Shorter poles may need two brackets, while longer or heavier installations generally require additional centre or intermediate supports. The manufacturer's recommended bracket spacing should always be followed, particularly for heavy duty curtain poles. 5. Should curtains be measured before buying a curtain pole? Yes. The curtain heading and weight can affect the required pole diameter, projection and accessories. Eyelet, pencil pleat, tab-top and other styles use different fitting arrangements. Checking the curtains before ordering helps ensure the correct curtain pole sets, rings, brackets and supports are selected.