The Cosibloc range at New Blinds wears its whole brief in its name: Blackout on one half, a honeycomb cell on the other, sold as a blind that fixes to the window without a drill. Every make-up on the card is titled Blackout, the construction is the pleated honeycomb (or cellular) cloth that folds flat into its own air pockets, and it is offered as a stick-on blind and in the clip-in perfect fit format, with a premium Dlx tier sitting above the standard line. There are 24 colourways from £70.98, and it is a New Blinds exclusive among the retailers we track.
Who it suits
Two kinds of buyer meet here. The first cannot or will not drill: renters, anyone with uPVC windows, and anyone wary of putting fixings into a tiled reveal. Cosibloc answers them twice over, as a stick-on blind mounted to the frame with adhesive and in the perfect fit format, whose slim frame clips into the rubber beading around a uPVC pane and lifts out again without a mark; our perfect fit guide sets out how that fixing works and where it earns its place. The second buyer wants the room dark. A blackout honeycomb does two jobs at once: the coated cloth blocks the light, and the pleated cells trap a layer of still air against the glass, the same trick that makes cellular blinds a quiet help with warmth and draughts, which our insulation guide explains. That suits bedrooms, nurseries and shift workers first, but also single-glazed windows and north-facing rooms that leak heat after dark. The Dlx premium tier is there for anyone wanting a heavier, dressier make-up of the same idea.
The colours
24 colours available
The shade card is compact and practical, as blackout ranges tend to be, because a light-blocking cloth is chosen for what it stops rather than for a splash of colour. The neutrals do the heavy lifting: a true Black, a Dark Grey, and two pale options in Ivory Cellular and White Cellular, while the warmer end runs through Brown Honeycomb and the sandy Dune Honeycomb. The Dlx tier brings its own flourish in Caviar Honeycomb, the deep near-black the premium make-up is named for. You will notice the construction written into the names themselves: Cellular and Honeycomb are two words for the same pleated, air-trapping cloth, so a shade labelled either way is telling you how it is built as much as what colour it is. As with any coated blackout, the cloth reads denser and flatter at the window than on a screen, and the two pales sit close enough that a photograph will not separate them, so order samples and judge them in the room's own light.
Price by your dimensions
Enter your window size. We round up to the next standard size, which matches how the retailer actually quotes you.
No price movement in our checks since 4 Jul.
The from-price buys the smallest standard make-up; the perfect fit version and the Dlx tier are listed as products in their own right and carry their own arithmetic, with the premium cloth the larger step up. Width and drop then do the usual work, so a small landing window and a wide bedroom pane land far apart. Put your own measurements against the table above, and make sure any quote names the exact make-up you want - stick-on, perfect fit or Dlx - because the same shade appears in more than one listing and they are not priced alike.
How it compares
There is no cross-shopping to be done, because Cosibloc is a New Blinds exclusive among the retailers we track, so no second shop cuts the same cloth to price against it. The trade for that, as with any exclusive, is that you cannot play retailers off one another, but you are buying a combination the identikit catalogues rarely carry: blackout and honeycomb insulation in a no-drill format, with a premium tier above it. The comparison that matters lives in the same shop. Cosishade is the light-filtering sibling - the same cellular construction and the same stick-on and perfect fit formats, but a softer cloth that screens and diffuses daylight rather than blocking it. Choose between them by the room's job: Cosibloc for a bedroom that must go dark and hold its warmth, Cosishade for a living space that wants privacy with the light left in. Against an ordinary blackout roller, the honeycomb adds the insulating air layer a flat panel cannot.
A note on care
Honeycomb cloth rewards a gentle hand and dislikes being crushed. Dust it with the vacuum's soft brush on a low setting, running along the pleats rather than across them so the cells keep their shape, and lift the odd mark with a barely damp cloth and a little mild detergent rather than a soak - the coated backing that does the blackout will not thank you for solvents or hard scrubbing. Raise and lower the blind now and then so the pleats fold evenly and never set a permanent crease. The perfect fit frames unclip for cleaning the window behind them and reseat without tools, so check they sit square as you go, and give any adhesive mount an occasional look. Kept dry and handled kindly, a honeycomb blind holds its crisp folds for years.