Window Treatments in London Renovations: Curtains, Blinds, and Specification

Window treatments are among the last elements specified and installed in a renovation, and among the most impactful on how the finished room feels. Curtains that hang from ceiling height rather than from above the window frame transform a room's proportions. Blinds that are the wrong opacity for the room's orientation make a bedroom feel like an office. Roman blinds in a fabric that does not stack cleanly never hang properly, regardless of the quality of the make-up.

Getting window treatments right is a specification exercise that starts early — the curtain track or pole fixings must go into solid background, which in a plastered room must be considered at first fix — and finishes in the detail of how the fabric is cut, lined, and hung.

Curtains: the premium specification

Full-length curtains are the appropriate specification for reception rooms, bedrooms, and any room where the priority is elegance, softness, and control over light and privacy at different times of day. They are also the most demanding specification in terms of fabric quantity, workmanship, and installation.

Track vs pole: a curtain track (concealed behind a pelmet or valance, or a slim-profile track) allows a fuller stack-back (the curtains open further, leaving more of the window unobstructed) than a pole. A decorative pole (brass, timber, wrought iron) is visible and part of the room's character — appropriate where the pole is an aesthetic statement. Concealed tracks are more versatile and produce a cleaner look in contemporary interiors.

Hanging height: the single most impactful specification decision for curtains is hanging height. Curtains hung from immediately above the window frame (at or just above the architrave) give the impression that the room is as tall as the window. Curtains hung from close to the ceiling — or from the ceiling itself, with a ceiling-mounted track — make the room feel significantly taller and more generous, even if the curtains are the same length. In any room with ceilings above 2,800mm, ceiling-height curtains are strongly preferred. In Victorian rooms with 3,200mm+ ceilings, ceiling-height curtains are the correct specification.

Heading type: the heading is how the fabric is gathered at the top of the curtain. The principal types: - *Pinch pleat*: formal, traditional, suitable for heavyweight fabric. The fabric is gathered into groups of 2–3 pleats at regular intervals, creating a structured top. - *Pencil pleat*: tighter, more continuous gather. Very common; works with a wide range of fabrics. - *Eyelet*: large metal rings through which the pole passes. Casual, contemporary. The folds hang in regular waves rather than gathered pleats. - *Goblet pleat*: the most formal heading. Individual rounded pleats, appropriate for heavy silk or damask in a formal room. - *Wave heading*: a track-only heading that creates a uniform, continuous wave with no defined pleats. Very contemporary; requires a specific wave track.

Fullness: curtains require more fabric than the window width to hang beautifully. Typical fullness ratios: - Pencil pleat: 2.5× window width - Pinch pleat: 2.0–2.5× - Eyelet: 1.5–2.0× - Wave: specified by the track manufacturer (typically 1.8–2.0×)

Under-specifying fullness produces curtains that look sparse and thin when drawn.

Lining: all curtains in a quality renovation should be lined. Lining improves drape, protects the face fabric from UV degradation, adds insulation, and improves light-blocking. Options: - *Standard lining*: cotton or polyester, prevents UV penetration, improves drape - *Interlined*: an additional layer of bump (a thick cotton wadding) between face fabric and lining. Creates a very full, structured hang; warmth and acoustic insulation. The luxury standard for formal rooms. - *Blackout lining*: essential for bedrooms. Coated fabric that blocks virtually all light. Must be sewn precisely to the curtain edges for full effectiveness.

Fabric selection: curtain fabric is specified by weight (gsm), content, and pattern repeat. Heavier fabrics (velvet, chenille, heavyweight linen) hang better and wear better than lightweight alternatives. Large pattern repeats create significant fabric waste — calculate the quantity required based on the repeat, not just the cut drop. A fabric with a 650mm pattern repeat on a 2.4m drop requires 4 repeats per drop, cutting to a 2,600mm drop and wasting 200mm per drop.

Blinds: functional specification

Blinds are more appropriate than curtains in kitchens, bathrooms, and rooms where simplicity or a clean contemporary aesthetic is preferred. Key types:

Roman blinds: fabric folds into a stack of horizontal pleats when raised. Soft, elegant, appropriate in bedrooms and reception rooms. The fabric must be medium-weight and have adequate body to fold cleanly — very lightweight fabric creates an untidy stack. Pattern repeats must be centred on the blind and cut precisely.

Roller blinds: the simplest and most practical option. A fabric panel rolls onto a barrel. Available in an enormous range of fabrics from near-transparent voile to full blackout. In a kitchen, a wipe-clean roller blind in an oil-resistant fabric is a practical specification. In a bedroom, a blackout roller behind a decorative curtain provides light control without sacrificing aesthetics.

Venetian blinds: horizontal slats (aluminium, timber, or faux timber) that tilt to control light direction as well as quantity. Appropriate in offices and contemporary spaces; less so in formal or period rooms. Timber venetians read warmer and more domestic than aluminium.

Plantation shutters: full-height timber shutters with adjustable louvres. Increasingly common in London renovation — they provide excellent light control, privacy, and insulation, and read as architectural rather than soft furnishing. Solid panel sections at the bottom of each shutter (the café-style configuration) maintain privacy at street level while allowing light from above. Planning constraints apply in conservation areas if shutters are visible externally.

Track and pole fixings: the first-fix consideration

All curtain tracks and poles require fixings into solid background. For a ceiling-mounted track, fixings must go into solid joists or into noggins installed for the purpose. For a wall-mounted pole above a window, the fixing must be in masonry, solid timber grounds, or noggins behind the plasterboard.

If the interior designer or window treatment supplier has not specified track positions before plastering, discuss them during the design phase and mark noggin or blocking positions on the drawings. Installing solid blocking at the intended track level (a 50×50mm softwood fixed between studs or battened to masonry) at first fix costs almost nothing; drilling fixings into hollow plasterboard at installation stage is a recurring nuisance that produces substandard results.