Made to measure is the only corner of the home industry where the customer manufactures the risk themselves. They measure the window, you cut fabric to those numbers, and if the measurement was wrong nobody can undo it. That makes the measuring guidance on your site something other than support content. It is the conversion rate.
We write growth plans for curtain and blind stores that already sell online. The plan treats the configurator and the measuring guide as the two most important pages you have, gets free samples into the hands of people who will not buy fabric they have not touched, and puts lead times and the custom returns rule in front of the shopper before payment.
It also handles what is specific to this trade: header types in the shopper's own words, blackout and thermal kept honest, cord safety on blinds, and a feed that can cope with a price that changes with every size.
A window covering is bought to solve one problem in one room. Light waking somebody at five in the morning, a cold draught, a street lamp, or a window that has had nothing on it since the move.
The first decision is the mount. Inside the recess gives a neat finish and needs the narrower measurement. Outside the recess covers more and blocks more light at the edges. Older windows are rarely square, so the advice to measure in three places and take the smallest is the difference between a blind that fits and fabric that is wasted.
Then width and drop, and the fullness a curtain needs. A gathered heading uses far more fabric than the width of the window, which surprises people and changes the price.
Header type is the next choice, and it is vocabulary many shoppers do not have. Pencil pleat, eyelet, pinch pleat, wave and tab top hang differently, and not all of them suit both a pole and a track.
Lining decides performance. Blackout, thermal and dimout are three different things, and shoppers use blackout to mean all of them.
Then fabric, which they want to touch, then lead time, then fitting, then the fact that a custom order usually cannot be returned. Autumn is the busiest stretch of the year.