Why do accurate window measurements matter before ordering curtains?

We measure accurately to avoid returns and ensure curtains give the privacy, light control and appearance we expect; correct measurements also tell us the track or pole length and the fabric required for pleats or gathers.

How do we decide between an inside mount and an outside mount?

We choose an inside mount for a neat, built-in look when the reveal is deep, and an outside mount when we want more coverage and better light-blocking - we usually allow 50 mm-150 mm overlap each side for outside mounts.

What is the simple step for measuring window width for curtains?

For an inside mount measure the reveal at top, middle and bottom and record the smallest width; for an outside mount measure from the chosen outer points (including any overlap) and record the total width or the actual pole/track length if you’ll fit hardware outside the window.

How should we measure the drop (height) so curtains finish correctly?

Measure from the underside of the pole or the track groove (where the hooks sit) to the point you want the curtain to finish, or for inside mounts measure the top of the reveal to the sill and use the smallest of three vertical measurements; round to the nearest 5 mm when ordering.

How much fabric fullness should we allow when buying curtain fabric?

We recommend multiplying the measured width by 1.5× for a casual gather, 2× for a fuller tailored look, and 2.5× for heavy pleated curtains or blackout linings; check product widths and pack quantities on the product page before ordering.

How to measure windows for curtains: an easy

Why accurate window measurements matter

Getting measurements right saves time, avoids returns and helps curtains hang and perform as we expect - for privacy, light control and style. We focus on simple, repeatable measurements you can do with a tape measure, a pencil and a helper for wider spans. Before you start, choose whether you want curtains that sit inside the frame (clean, compact) or outside the frame (more coverage, better light-blocking).

Tools you’ll need

Steel tape measure (min 3-5 m) or a long cloth tape
Notepad or phone to record measurements
Pencil and small spirit level (optional)
A helper for wide windows or heavy measuring

Quick decision: inside or outside mount

If you prefer a neat built-in look and you have a deep reveal (window recess) choose an inside mount. For improved blackout, overlap and visual drama choose an outside mount - we usually recommend 50 mm-150 mm overlap each side for standard windows. Write your choice on your notes; it changes how you measure.

Step 1 - Measure the width (the most important dimension)

Width tells you how wide your track or pole must be and how much fabric you need for pleats or gathers. Measure differently depending on mount type:

Inside mount: Measure the window reveal at three points - top, middle and bottom. Record the smallest measurement. This is the inside width.
Outside mount: Decide how far you want the curtains to clear the glass on each side. For everyday windows we suggest 50 mm-100 mm per side; for generous coverage or tall rooms use 100 mm-150 mm per side. Measure from outer point to outer point and record the total width.

Practical note: if you plan to fit a curtain pole or track outside the window, measure the exact pole/track length (including finials) and use that as your width. We show curtain categories and poles on our Curtains Blinds page for matching hardware and fabrics. Curtains Blinds

How much fullness to allow

Curtains look best when the fabric has some fullness (gathering). Typical fullness ratios are:

1.5× width for a casual look
2× width for a fuller, tailored look
2.5× for heavy pleated curtains or blackout linings

Multiply the measured width by your chosen fullness to estimate how much fabric you’ll need. When shopping on Bash, check product widths and pack quantities on the fabric or curtain product page.

Step 2 - Measure the drop (height) accurately

Drop determines fabric length and whether curtains skim the floor or puddle. There are common finishing options:

Ceiling-to-floor or just above skirting for a modern, seamless look
Window-sill length for café-style or kitchen windows
Puddled (extra 100-300 mm) for a formal look - only for heavy fabrics

How to measure:

For pole-mounted curtains: measure from the underside of the pole or eyelet to the point you want the curtain to finish (e.g. 10 mm above floor).
For track-mounted curtains: measure from the track groove (where the curtain hooks sit) to the desired finishing point.
If measuring inside the reveal (inside mount): measure from the top of the reveal to the sill or chosen finish point and use the smallest of three vertical measurements.

Record each window’s width and drop separately - rooms often have small variations. We recommend rounding measurements to the nearest 5 mm for ordering.

If you want one continuous curtain across several windows (common on livingroom walls), measure the full combined width including the recommended overlaps between panels so the fabric stacks neatly when opened.

For inspiration and examples of curtain styles and buying options, see our article on Curtains for sale: simple choices for every South African home. Curtains for sale: simple choices for every South African home

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Special cases: bay windows, sliding doors and odd shapes

Bay windows: measure each section (face) of the bay separately - width and drop - and note the angle between faces. If you want a single curved track, measure the total width from the outermost points including desired side overlaps. For simpler installs, use separate panels on each face and add 50 mm-100 mm overlap at each seam.

Sliding doors and patio doors

Measure the full width of the door opening plus the side overlap you want when the curtains are closed (usually 150 mm-300 mm per side for full coverage). For drop, measure from the track or pole position to the floor, allowing 10 mm clearance so curtains don’t drag in high-traffic doorways.

Irregular windows and sash windows

For small, odd-shaped or sash windows we recommend inside mounts where possible. Measure the reveal depth - if it’s less than 70 mm an inside mount may not allow for the curtain to hang freely, in which case choose outside mount measurements and allow an overlap. If your windows have security bars or external fixtures, measure to those fixtures and note them on your order so fittings can be adjusted.

Practical cost note: fabric and lining prices in South Africa vary widely. Expect basic ready-made curtains from around R250-R900 per panel and made-to-measure options from R800 upwards depending on fabric and lining. These are estimates - final prices depend on width, fullness and chosen fabric.

How to record and order with confidence

Use a simple table on your phone or notebook: Window name, Mount type, Width (mm), Drop (mm), Fullness multiplier, Notes (obstacles, pole/track position). Photograph each window with a tape measure in frame - the photo helps confirm the measurements later.

If you’re browsing fabrics or poles, our Home Furnishings category has curtains, tracks and poles so you can match hardware and fabric choices in one place. Home Furnishings articles and Curtains Blinds list measured product details to compare against your notes.

When to call a fitter

Fitters are useful for very large spans, tricky ceilings, or when you want a professionally pleated finish. If you choose a fitter, share your measurement table and photos before they visit - that speeds up the job and keeps costs down.

Final checklist before ordering

Have we recorded width and drop for each window and chosen inside vs outside mount?
Did we pick a fullness ratio and convert that into fabric quantity?
Have we accounted for poles/tracks, finials, or stack-back space when open?
Are there photos attached to each window note for clarity?

Measuring windows need not be stressful. We recommend measuring twice and ordering once - that small extra check saves returns. When you're ready to shop, explore curtain fabrics and hardware in our Curtains Blinds collection or browse Home Furnishings articles for more styling ideas. Curtains Blinds

How to measure windows for curtains: an easy step-by-step method

Measure width first

Sources

Why Choose Bash?

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30-Day Returns

Nationwide Support

Why Choose Bash?

Free Delivery

30-Day Returns

Nationwide Support

Choose mount type

Record and photo

Why accurate window measurements matter

Tools you’ll need

Quick decision: inside or outside mount

Step 1 - Measure the width (the most important dimension)

How much fullness to allow

Step 2 - Measure the drop (height) accurately

Special cases: bay windows, sliding doors and odd shapes

Sliding doors and patio doors

Irregular windows and sash windows

How to record and order with confidence

When to call a fitter

Final checklist before ordering

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