The Denbigh buys you four to six weeks at each end of the growing season. Sow in the warm, then move trays out here to harden off: the twin-wall polycarbonate lid holds daytime warmth and knocks the edge off a cold night, while the sloping angle throws rain off and catches low spring sun. Over winter it keeps overwintering herbs and garlic out of the worst of the wet.

The frame is 20mm pressure-treated European softwood with a 106 cm x 62 cm footprint, deep enough at the back for 20 cm pots and low enough at the front to reach across. The lid is 4mm twin-wall polycarbonate in a timber surround, far safer around children and pets than glass and much lighter to lift. A galvanised stay holds it at two ventilation positions, and a third notch props it fully open on a hot day.

What is included

Pre-cut and pre-drilled frame panels
Hinged lid with 4 mm twin-wall polycarbonate glazing fitted
Galvanised two-position lid stay and handle
All screws and fixings plus illustrated assembly instructions

Dimensions and materials

External size (W x D)	106 cm x 62 cm
Internal size (W x D)	98 cm x 54 cm
Rear height	52 cm
Front height	36 cm
Glazing	4 mm twin-wall polycarbonate
Frame	20 mm pressure-treated European softwood
Lid stay	Galvanised steel, two ventilation positions
Weight	22 kg

Care

Stand the frame on firm level ground with the low front facing south if you can. Prop the lid open on warm days, or seedlings will cook; close it by late afternoon in spring. Wipe the polycarbonate with warm soapy water twice a year to keep light transmission up, and treat the timber with a plant-safe exterior wood oil in the first year and every two to three years after.

Delivery and returns

Free UK delivery on every order, with no minimum spend. We dispatch in 1 – 2 business days and transit takes 5 – 7 business days on a tracked DPD or Parcelforce service, so most orders arrive within 6 – 9 business days. All prices include VAT. You have 30 days from delivery to return an unused item, on top of your statutory 14-day right to cancel.

polycarbonate lid

Denbigh Timber Cold Frame