How to Measure Windows for Custom Shades (Step-by-Step) (February 2026) Getting new custom window shades for your home or office is an exciting upgrade! They can transform the look and feel of a room, enhance privacy, improve energy efficiency, and even offer smart home integration. But before you can enjoy these benefits, there's one crucial step: accurate measurement. At Blinds Concept, we understand that measuring your windows might seem daunting, but with our step-by-step guide, you'll find it's a straightforward process.
Precise measurements are key to ensuring your custom shades fit perfectly, operate smoothly, and look stunning. This comprehensive guide will walk you through everything you need to know, whether you're planning for an inside mount or an outside mount. Grab your steel tape measure, a pen, and a notepad – let's get started! What Tools Do I Need to Measure My Windows? Before you begin, gather these essential tools: Steel Tape Measure: A rigid, metal tape measure is crucial for accuracy. Fabric or flexible tape measures can stretch, leading to incorrect readings.
Ensure it's long enough to cover your window's full width and height. Pen or Pencil: For jotting down your measurements. Notepad or Paper: To record your findings clearly. We recommend drawing a simple diagram of each window and labelling your measurements. Step Stool or Ladder (if necessary): To safely reach the top of your window frame. Never stand on furniture or something unstable. Should I Measure for an Inside Mount or Outside Mount? This is one of the first decisions you'll need to make, as it significantly impacts how you take your measurements.
Both options offer distinct aesthetics and functional benefits. Inside Mount: An inside mount shade fits snugly within the window frame or casing. This option offers a clean, recessed look, allowing the window trim to remain visible. It's often preferred for a minimalist design or when you want to highlight decorative window frames. Aesthetics: Clean, built-in look; allows window moulding to show. Light & Privacy: May have small light gaps on the sides, as the shade is slightly smaller than the opening to prevent rubbing. Obstructions: Requires a minimum depth inside the window frame.
Check for obstructions like crank handles or locks. Best For: Highlighting attractive window trim, smaller spaces, contemporary designs. Outside Mount: An outside mount shade is installed on the wall or window trim surrounding the window opening, extending beyond the frame. This option can make a window appear larger, conceal architectural imperfections, and offer superior light blockage and privacy. Aesthetics: Can make windows appear larger; covers imperfections. Light & Privacy: Offers maximum light blockage and privacy due to overlap.
Obstructions: Ideal if your window frame is too shallow for an inside mount or has obstructions. Best For: Maximising light control, enhancing privacy, covering less attractive window frames, French doors. Once you've decided on your mounting style, you can proceed with confidence. How Do I Measure for Inside Mount Custom Shades? Measuring for an inside mount requires precision. Remember, we will make deductions for a proper fit, so always provide the exact window opening size.
Step-by-Step for Inside Mount: Measure Width (3 spots): Measure the exact width of the window opening at the top, middle, and bottom. Always measure to the nearest 1/8th of an inch. Record the smallest of these three measurements. This is your width. Why the smallest? To ensure the shade doesn't get stuck or rub against the frame, especially if your window isn't perfectly square. Measure Height (3 spots): Measure the exact height of the window opening at the far left, middle, and far right. Measure to the nearest 1/8th of an inch. Record the longest of these three measurements.
This is your height. Why the longest? To ensure your shade fully covers the window vertically. Measure Depth: Measure the depth of the window casing from the glass to the edge of the trim. This measurement helps us determine if your chosen shade style (e.g., roller blinds, Roman shades) will fit entirely within the frame without protruding. Each product type has a minimum depth requirement, which Blinds Concept can provide. If the depth is insufficient, an outside mount might be a better option or a product with a shallower headrail. Double-Check: Go over all your measurements one more time.
Accuracy here prevents costly mistakes. How Do You Measure Window Blinds for an Outside Mount? Measuring for an outside mount gives you more flexibility, as the shade will extend beyond the window opening. The goal is to ensure adequate overlap for privacy and light control. Step-by-Step for Outside Mount: Measure Width: Measure the exact width of the window opening from edge to edge of the casing (if present). If there's no trim, measure the window opening itself. Then, decide how much overlap you want on each side.
We generally recommend an overlap of at least 1.5 to 3 inches on each side (total 3 to 6 inches wider than the opening). This minimises light gaps. Your final width measurement will be the window opening width + desired overlap on each side. E.g., if the opening is 30 inches and you want 2 inches overlap on each side, your ordered width is 34 inches. Measure Height: Measure the exact height of the window opening from the top of the casing to the bottom of the casing or sill. Decide how much overlap you want above and below the window opening.
A common recommendation is 3 inches above the window opening to allow for mounting hardware and ensure full coverage. Below the window, you can measure to the sill, or if you want the shade to extend past the sill, add a few extra inches. Your final height measurement will be the window opening height + desired overlap above and below. E.g., if the opening is 50 inches, you want 3 inches above and to the sill (which is 0 overlap below), your ordered height is 53 inches.
Consider Obstructions: Look for anything that might interfere with the shade, such as door frames, furniture, or existing window treatments. Ensure your chosen width allows for clearance. Mounting Location: Determine where on the wall above the window you want to mount your shade. This could be directly on the trim, on the wall above the trim, or even on the ceiling. Ensure you have enough flat surface for the mounting brackets. Double-Check: Double-check all measurements.
For outside mounts, remember that the measurements you provide will be the exact size the finished product is made, so ensure you’ve included your desired overlap. Is There a Standard Size for Window Blinds or Shades? While there are common window sizes in construction, there's no true "standard size" for custom window shades. Every window can vary slightly, even in the same home. This is why custom window treatments are so popular and why accurate measuring is paramount.
Store-bought, off-the-shelf blinds come in a limited range of sizes and often require you to cut them down, which can be messy and lead to an imperfect fit and finish. Custom shades, like those offered by Blinds Concept, are precisely manufactured to your specific window dimensions, ensuring a perfect, tailored look and optimal functionality. This is especially important for specialty windows, unique architectural designs, or when considering advanced options like motorized blinds , where an exact fit is vital for smooth operation. When Should I Call a Professional to Measure My Windows?
While many homeowners are perfectly capable of measuring their own windows with a bit of guidance, there are certainly situations where calling in the experts is advisable: Large or Irregularly Shaped Windows: Bay windows, arched windows, or exceptionally tall windows can be tricky to measure accurately. Complex Installations: If you're dealing with unique architectural features, obstructions, or require solutions for difficult-to-reach windows.
Motorized or Smart Home Integration: For motorized blinds that need to operate flawlessly, professional measurement ensures the perfect fit for the motor and shade mechanism. Multiple Windows: If you're outfitting an entire home or a large commercial space, managing dozens of measurements can become overwhelming. Peace of Mind: If you're simply uncomfortable with the process or worried about making a mistake, a professional will take on that responsibility. Warranty Concerns: Some companies offer a "measure for free" service or a measurement guarantee.
Always confirm the policy with your provider. At Blinds Concept, we understand the value of professional service. While we empower our clients with detailed DIY guides, we also offer professional consultations and expert advice to ensure your custom window treatment journey is smooth and successful from start to finish. Our team can guide you on the best mounting options, product choices, and precise measurements tailored to your home.
A Note on Window Sills, Trim, and Obstructions These elements are critical to consider for both inside and outside mounts: Window Sill: For inside mounts, if the sill protrudes significantly, it might affect the overall height measurement or how the shade hangs. For outside mounts, decide if you want the shade to rest on the sill or extend below it. Trim/Moulding: For inside mounts, ensure your measurements are taken from the innermost points of the trim. For outside mounts, you might mount on the trim itself or on the wall above it, depending on your desired aesthetic and coverage.
Obstructions: Think about anything that could block your shades from operating freely. This includes window cranks, alarm sensors, door handles (especially for shades on doors), or even furniture. Be sure to measure the depth required for the headrail and bottom rail to clear any obstructions. By carefully considering these factors during your measurement process, you'll avoid common pitfalls and ensure your custom shades function beautifully for years to come. Remember, the goal is always a perfect fit that enhances your space. Ready to Transform Your Windows?
Measuring accurately is your first step towards beautiful, perfectly fitting custom shades. Take your time, double-check your work, and don't hesitate to reach out if you have questions. At Blinds Concept, we're here to help you every step of the way, from measurement to installation. Explore our range of exquisite custom shades and discover the perfect style for your space. Need a helping hand or expert advice? We're just a click away! Get a Quote for Your Custom Shades Today! Frequently Asked Questions (FAQ) Q1: Why is a steel tape measure better than a cloth one for measuring windows?
A1: Steel tape measures are rigid and don't stretch, ensuring consistent and accurate measurements. Cloth tape measures can flex and stretch, leading to errors that can affect the fit of your custom shades. Q2: My window isn't perfectly square. What should I do? A2: When measuring for an inside mount, always take three width measurements (top, middle, bottom) and three height measurements (left, middle, right). For width, use the smallest measurement. For height, use the longest. This ensures the shade will fit without getting stuck.
Q3: Should I deduct anything from my measurements for an inside mount? A3: No, absolutely not! Always provide Blinds Concept with the exact, precise measurements of your window opening as you've taken them. We have specific manufacturing deductions for inside mount shades to ensure a perfect, snug fit and smooth operation without rubbing against the window frame. Your job is to give us the raw opening dimensions. Q4: How much overlap should I add for an outside mount?
A4: A general recommendation is to add at least 1.5 to 3 inches on each side of the window opening for width, and 3 inches above the opening for height. This overlap helps minimise light gaps and increases privacy. You can adjust this based on your aesthetic preference and specific needs. Q5: Can I install custom shades myself? A5: Yes, many custom shades are designed for relatively straightforward DIY installation. Blinds Concept provides clear instructions with your order.
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