How to Measure for Blinds: A Step-by-Step Guide
Accurate measurements are the foundation of well-fitted blinds. A difference of only a few millimetres can create unwanted light gaps, prevent a blind from operating smoothly, or leave a window covering looking uneven. Taking your time before ordering helps you choose the right size with confidence.
Australian homes often feature large windows, sliding doors and strong afternoon sunlight, so the ideal fitting method depends on the window frame, room layout and level of light control required. Recess fitting sits inside the reveal, while face fitting covers the frame and can offer better privacy and glare reduction.
Use a steel tape measure rather than a fabric tape, record every measurement in millimetres and check the product’s individual measuring instructions. Different blind styles have different deductions, so avoid altering your figures unless the supplier specifically requests it.
| Fitting style | Measure the width | Measure the drop | Main benefit |
|---|---|---|---|
| Recess fit | Inside the reveal at three points | Inside the reveal at three points | Neat, built-in appearance |
| Face fit | Across the area to be covered | From the fixing point to the desired lower edge | Greater light and privacy coverage |
| Roller blind | Reveal or outside frame, depending on choice | From the top fixing point to the sill or desired finish | Simple operation and flexible placement |
| Venetian or Roman blind | Inside or across the frame | Top of reveal or headrail to sill or chosen endpoint | Adjustable light control and decorative appeal |
Choose The Right Fitting Style
Begin by deciding whether the blind will sit inside the window recess or over the front of it. A recess fit follows the internal dimensions of the opening and keeps the window treatment compact. It works well where the reveal is deep, square and free from handles, locks or obstructions.
A face fit, sometimes called an outside mount, is fixed to the wall or architrave around the window. It is useful when the recess is shallow, irregular or crowded by window furniture. It can also reduce light leakage around the edges, which is valuable in bedrooms and living rooms exposed to the bright Australian sun.
Check how the window opens before choosing. A handle may interfere with a roller blind, while a sliding door needs enough clearance for safe movement. In a Melbourne apartment or Sydney terrace, a compact recess fit may preserve valuable space; in a Brisbane home, a face fit may provide extra coverage against heat and glare.
Prepare The Window And Your Tools
Clear ornaments, curtains and furniture from the measuring area. Open the window and test the handle, flyscreen, security grille or plantation shutter to identify anything that could obstruct the blind. If the window is unusually high, use a stable platform and ask another person to steady the tape rather than stretching from an unsafe position.
You will need a metal tape measure, pencil, paper and a step ladder if required. A spirit level can help you assess whether the reveal is reasonably square, while a torch makes it easier to inspect corners and identify tiles, skirting boards or uneven plaster.
Measure each window separately, even when several windows appear identical. Building movement, replacement windows and hand-finished reveals can create small differences. This is particularly important in older homes in Adelaide or Perth, where openings may not be perfectly uniform.
Measure A Recess-Fit Blind
For the width, measure inside the reveal from left to right at the top, middle and bottom. Write down all three figures. Use the smallest width as the reference measurement, because the blind must pass through the narrowest part of the opening and operate without rubbing against the sides.
Next, measure the drop from the top of the reveal to the sill at the left, centre and right. Again, record all three values and use the shortest measurement. If the sill slopes or the reveal is noticeably out of square, mention this when requesting a quote instead of trying to correct the discrepancy yourself.
Do not automatically deduct space from your measurements. Some manufacturers make the necessary allowance for brackets, fabric and operating components, while others ask customers to provide the final finished size. Follow the instructions for the selected roller, Roman, Venetian, cellular or vertical blind.
If the recess contains tiles, a deep sill or a projecting handle, check that the blind can clear these features when raised and lowered. For a blackout blind, remember that a recess fit usually leaves a small perimeter gap, so face fitting may produce a darker result.
Measure A Face-Fit Blind
Start by deciding exactly how much of the wall or architrave the blind should cover. Measure the desired finished width from the left edge to the right edge, including enough overlap beyond the glass to limit side light. The required overlap varies according to the blind system and the amount of privacy or darkness wanted.
Measure the finished drop from the proposed top fixing line to the point where the blind should end. This might be the window sill, the bottom of the architrave or a point below the frame. Check that the blind will not collide with a handle, tap, splashback, bench or nearby door when operated.
The fixing surface must be strong and reasonably level. Plasterboard may require suitable anchors, while masonry, timber and steel frames need different screws or fittings. If the window sits above a kitchen bench or in a tiled bathroom, allow space for brackets and confirm that the chosen product is appropriate for humidity and cleaning conditions.
Large glazed areas in Perth and northern Queensland can receive intense heat, so a wider face-fit blind may improve comfort and reduce glare. However, confirm that the blind will not obstruct a flyscreen, security door or ventilation path.
Record These Details Before Ordering
Keep a clear record of the measurements and the product information needed for an accurate quote:
- Window location, such as bedroom, kitchen or living room
- Recess or face-fit preference
- Width and drop measurements at every required point
- Blind type, fabric, colour and control position
- Handle, sill, screen and furniture clearance
- Whether privacy, blackout or solar protection is the priority
Also note whether the window is in a rental property, strata apartment, heritage home or commercial space. Australian strata buildings may require approval before fixing into external walls, window frames or common property. In a rented home, the landlord or property manager may need to approve drilling and changes to window furnishings.
If the room is being refurbished as a whole, consider the relationship between the blind width, furniture scale and circulation space. Dickinson’s guide to sofa sizing can help when coordinating window treatments with seating and the available floor area.
Check Safety, Installation And Final Fit
Internal window coverings sold and installed in Australia must meet mandatory cord-safety requirements. Loop cords and chains should be secured with an appropriate tension device, and blinds should be fitted according to the supplied safety instructions. Keep beds, cots, sofas and climbing furniture away from cords, particularly in children’s bedrooms.
Before finalising the order, check whether the blind will be manually operated, chain controlled, spring assisted or motorised. Motorisation can be practical for high windows and large glazed doors, while rechargeable systems may avoid the need for new electrical wiring. Ask about compatibility with existing smart-home controls if that matters to your household.
Avoid Common Measuring Errors
- Measuring only once instead of checking width and drop at three points
- Using the largest recess measurement for a blind that must fit the smallest point
- Confusing the window opening size with the finished face-fit size
- Forgetting handles, flyscreens, security grilles and nearby doors
- Adding deductions or overlaps without checking the supplier’s instructions
- Recording centimetres instead of millimetres when the order form requires metric measurements
After installation, operate the blind slowly and confirm that it clears the sill, handles and surrounding furnishings. Check that the brackets are secure, the fabric rolls evenly and the control remains accessible without creating a cord hazard. If the opening is unusually wide, high or irregular, professional measuring and fitting can prevent expensive mistakes and provide a more precise finish.