The decisions that make a Roman blind look right, not just fit

Fabric weight and why it changes everything

A lightweight cotton or linen-look fabric folds into soft, slightly informal pleats and suits a relaxed bedroom or a smaller window where a heavier cloth would look overbearing. A heavier furnishing weight fabric, of the kind you'd expect on formal curtains, holds a crisper, more architectural pleat and suits a period living room or dining room with tall proportions.

The wrong weight for the fold style you want is the most common disappointment we see with off-the-shelf Roman blinds: too light a fabric can sag between folds, and too heavy a fabric on a small window can look stiff rather than soft.

Lining and interlining explained

A standard lining is sewn to the back of the face fabric, giving the blind a uniform appearance from outside the house, protecting the visible fabric from sun fade, and adding a degree of light control and thermal benefit. Interlining adds a soft, often brushed layer of wadding between the face fabric and the lining, giving a plumper, more luxurious fold, extra insulation, and noticeably better light blocking, at a higher price than a lined-only blind.

For a period bedroom or a formal room where budget allows it, interlining is usually worth the extra: the fold looks fuller and the blind performs better in both winter and summer. For a simpler room or a tighter budget, a good lining alone still gives a very presentable result.

• Unlined: rare, used mainly for pure light-filtering decorative effect
• Lined: the standard choice, protects fabric and gives a uniform outside appearance
• Interlined: fuller pleats, better insulation and light control, higher cost
• Blackout lining: available where a Roman blind needs to double as a bedroom blackout

Stack depth: the detail people forget to plan for

When a Roman blind is fully raised, the folded fabric piles up at the head of the window rather than disappearing into a roller tube, which means a real depth of stacked fabric, often ten to twenty centimetres depending on the drop and lining, sits across the top of the glass even when the blind is fully open. On a tall window this is barely noticeable; on a shorter window it can meaningfully reduce the visible glass and the light let in.

This is worth planning for at the measuring stage, particularly if the blind is fitted above the window onto the wall or frame rather than inside a deep recess, since the stack needs somewhere to sit without blocking light from a low sill or obstructing a window handle.

Cords, chains and child safety

A traditional Roman blind operates on a corded pulley system, and any exposed cords must be fitted with a cleat or tensioner fixed to the wall in line with current child safety regulations, keeping any loop safely out of reach. Where a Roman blind is going into a child's bedroom or nursery, we'd generally recommend a cordless or chain-and-cleat system instead, so the softness of the fabric doesn't come with a safety compromise.

Where Roman blinds work best

Formal living rooms and dining rooms with tall sash or casement windows suit the tailored, furnished look particularly well, especially where a heavier fabric picks up other soft furnishings in the room. Period bedrooms benefit from the softer alternative to a shutter or roller, especially paired with an interlined or blackout-lined fabric for warmth and darkness together.