The Mollendo is a perfect-fit blind range from Blinds By Post that combines plain light-filtering finishes with explicitly blackout-labelled variants in a single, coherent collection. The clip-in frame seats in the rubber gasket of UPVC double-glazed windows - no drilling, no wall plugs - and the 18 colourways start from £58.32. What makes this range notable within the perfect-fit category is the side-by-side availability of standard and blackout fabrics, letting buyers choose the right opacity for each room without switching to a different product family.

Who it suits

Perfect-fit fitting means this range is restricted to UPVC double-glazed windows with rubber-sealed panes and enough recess depth to accommodate the frame. If your windows are timber, aluminium, or single-glazed, it will not fit. Within that constraint, the Mollendo suits anyone who needs a no-drill solution - renters, leasehold flat owners, or buyers who simply want to avoid fixing into their window frames.

The blackout variants - Blockout Cloud, Blockout Chocolate, Blockout Ash, Blockout Charcoal, Blockout Stone, and Blockout White - are those the retailer describes as blocking light. Because the blind fabric sits within the perfect-fit frame rather than slightly proud of the recess, edge-leak is reduced compared with a standard bracket-fixed roller, which makes these blackout options particularly useful for bedrooms. Even so, a blackout fabric reduces rather than eliminates room darkness; a small amount of light can still enter around any blind's perimeter.

The plain non-blackout finishes - Cloud, Pumice, and Sage Green - are suitable where privacy or light diffusion matters more than darkness: hallways, bathrooms, or living rooms where you want some daylight with the blind down. The opacity grade of these three finishes is not stated beyond their omission from the "Blockout" naming, so confirm with Blinds By Post whether they are dimout or light-filtering if that distinction matters to your room.

The colours

18 colours available

Nine finishes span a cool and neutral palette. The six blackout options include white, stone, ash, charcoal, chocolate, and a pale cloud tone - covering the main neutrals from near-white to near-black in that fabric type. The three plain finishes add Cloud (again in the lighter, non-blackout version), Pumice (a warm sand tone), and Sage Green (the range's only colour with a green cast). The collection reads as purposeful rather than broad: the emphasis is clearly on the neutral and functional end of the spectrum, which suits the practical nature of the perfect-fit format.

Price by your dimensions

Made to measure from £58.32. Check Blinds By Post for the price at your exact window size.

At £58.32 this is among the more accessible price points for a made-to-measure perfect-fit blind. Price will increase with window dimensions, and the made-to-measure nature means you specify your own width and drop rather than trimming a standard size. Measure the width of your window pane (not the recess) when ordering a perfect-fit, as the frame clips to the glass unit itself.

How it compares

The Mollendo's defining characteristic is the dual-fabric offer within one named range. Many perfect-fit collections from other retailers keep their blackout and non-blackout blinds in separate product lines; having both here under a consistent palette is useful if you're fitting multiple rooms with different opacity requirements and want a consistent colour story throughout.

Compared with a standard roller blind in an inside-recess fit, a perfect-fit blind like this typically provides better edge control, since the frame surrounds the glass unit. The trade-off is the UPVC-only limitation and the fixed frame dimensions - if you later change your windows, the blind may not transfer. If blackout performance is the absolute priority over convenience of fitting, a heavier roller fabric face-fixed with a solid cassette can reduce edge-leak further, but it requires drilling.