When you invest in premium window treatments, the difference between a "good" fit and a "perfect" fit comes down to a few millimetres. At Blinds Concept, we have spent years helping homeowners across Halifax, Dartmouth, Bedford, and Sackville elevate their interiors with bespoke solutions. While our team is always available for professional on-site measurements, many Nova Scotia residents prefer to start the process themselves to get a head start on their home renovation projects.
Measuring for custom blinds isn't inherently difficult, but it does require a specific methodology to ensure your new window coverings operate smoothly and look integrated into your architecture. Whether you are overlooking the Halifax Harbour or nestled in a quiet Bedford suburb, this guide will provide the technical precision needed to measure your windows like a pro. How do I calculate the size of blinds I need? The first step in calculating your blind size is deciding on the mounting style.
There are two primary ways to install window treatments, and your measurements will differ significantly based on your choice: Inside Mount: The blind is installed inside the window casing. This provides a sleek, "built-in" look and is the most popular choice for modern Halifax homes. It showcases the window trim but requires more precise measurements to ensure the blind doesn't rub against the frame. Outside Mount: The blind is installed on the wall above the window or directly on the trim.
This is ideal if your windows aren't deep enough for an inside mount, or if you want to make a small window appear larger. It also provides superior light blockage as the fabric overlaps the edges of the opening. To calculate the size, always use a steel measuring tape . Fabric tapes or rulers are prone to sagging and inaccuracy. Record your measurements to the nearest 1/8th of an inch. Do not round up or down—our manufacturing facility in Nova Scotia will handle the necessary deductions to ensure the product fits perfectly. Where do you measure for inside mount blinds?
For an inside mount, you are measuring the opening of the window itself, not the window glass. Because no window is perfectly square, you must measure in three different places for both width and height. Measuring Width Measure the inside width of the window frame at the top, middle, and bottom . For inside mounts, the most important measurement is the narrowest width . If the top of your window is slightly narrower than the bottom, a blind cut to the bottom width simply won't fit into the top of the casing.
Measuring Height Measure the inside height from the top of the window sill to the underside of the top casing. Measure at the left, centre, and right . Unlike the width, for the height, you should record the longest measurement . This ensures the blind reaches the sill even if the window is slightly slanted. Checking Depth Don’t forget to check the depth of your window casing. Different products require different minimum depths. For example, zebra blinds or motorized rollers often require more depth than slim-profile aluminum blinds.
If your window is too shallow, an outside mount may be required. How much bigger should outside mount blinds be than the window? Outside mount blinds offer more flexibility, but they require a "bracket-to-bracket" measurement approach. Since these blinds sit on the outside of the frame, you are in control of how much coverage you want. Step 1: Determine the Width. Measure the width of the area you want to cover. We generally recommend adding at least 2 to 3 inches of overlap on each side (4 to 6 inches total) beyond the window opening. This minimizes light leakage and ensures privacy.
Step 2: Determine the Height. Measure from where you want the top of the blind to be (usually 2-3 inches above the window trim) down to where you want the blind to end. If you have a protruding window sill, you may want the blind to end just above it. If there is no sill, extending the blind 2 inches below the bottom of the window creates a more finished look. If you are unsure which mount is best for your specific room layout, our Halifax specialists can provide a virtual or in-person assessment to help you decide. Do you measure the window or the blind?
This is the most common point of confusion for DIYers. Always measure the window opening, not an existing blind. When you order custom treatments from Blinds Concept, you provide us with the exact window dimensions. Our production team then applies standard deductions. For example, on an inside mount, we might shave off 1/4 of an inch from the width to ensure the hardware has enough room to snap into the brackets without scraping your paint. If you provide us with measurements where you’ve already subtracted space, the resulting blind will be too small and leave large light gaps.
For an outside mount, the measurements you provide are usually the "ordered" size, meaning we will make the blind to those exact dimensions. Always clarify this with your consultant during your design consultation . Common Mistakes to Avoid Even seasoned renovators in Dartmouth and Bedford can run into trouble if they skip these crucial details: The "Swap" Error: It sounds simple, but people often accidentally switch the width and height on their order forms. Always list Width (W) first, then Height (H) .
Ignoring Obstructions: Look for window cranks, handles, or locks that might stick out and hit the blind. If you have a crank handle, you may need an outside mount or a specific type of spacer block. Measuring Only One Window: In many Nova Scotia homes, two windows that looks identical are actually slightly different sizes. Never assume—measure every single window individually. Not Using a Level: If your window is severely out of level, a standard blind might hang crookedly. If you notice a variance of more than 1/2 inch between your three measurements, it’s time to call in the professionals.
Why Professional Measurement is Often the Best Route While DIY measuring is helpful for budget planning, there is a reason Blinds Concept offers professional measurement services across the HRM. Custom window treatments are a long-term investment. If you measure incorrectly, the product often cannot be "cut down" or altered later, leadings to costly replacements. Our experts don't just measure for size; they assess your wall material (drywall vs. plaster), check for structural headers, and ensure that the weight of the blinds will be properly supported.
We also consider how the blinds will interact with your existing moultings and baseboards—details that are easy to miss but vital for a high-end finish.
If you are looking for more inspiration on which styles to choose for your newly measured windows, check out our recent posts on "The Best Motorized Blinds for Modern Homes" or "How to Choose the Right Opacity for Your Bedroom." { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{ "@type": "Question", "name": "Should I measure in centimetres or inches?", "acceptedAnswer": { "@type": "Answer", "text": "For custom blinds in Canada, it is standard to measure in inches to the nearest 1/8th of an inch.
Most manufacturing software is calibrated for imperial measurements." } }, { "@type": "Question", "name": "Do I need to take deductions for inside mount blinds?", "acceptedAnswer": { "@type": "Answer", "text": "No. Provide the exact window opening measurements to Blinds Concept. We will take the necessary factory deductions to ensure a perfect fit." } }, { "@type": "Question", "name": "What if my window frame is shallow?", "acceptedAnswer": { "@type": "Answer", "text": "Most blinds require at least 2 inches of depth for a flush inside mount.
If your frame is shallower, you may need a 'partial' inside mount or an outside mount." } }] } Let the Experts Handle Your Next Project Ready to transform your home with precision-fitted window treatments? Whether you’ve taken your own measurements or want the peace of mind that comes with a professional fit, we are here to help. Blinds Concept serves the entire Halifax Regional Municipality with premium products and expert installation. Contact us today for a free quote or book your in-home consultation to see our latest fabrics and styles in person.