How to insulate a greenhouse

Do it:

Dec, Jan, Feb, Nov

Takes just:

30 minutes

Insulate your greenhouse with a layer of bubble wrap and give your plants a helping hand through winter. Your greenhouse will have fewer draughts and will also benefit from lower bills if you use a heater during the very cold months.

You will need

  • Measuring tape
  • Bubble wrap
  • Scissors
  • Nails, drawing pins or wire to fix polythene in place


Before buying any bubble wrap, measure the sides, roof and ends of the greenhouse.

Starting with the sides, fix the bubble wrap to the frame using nails, drawing pins or wire, keeping it tight for extra insulation.

When insulating the roof, fix the bubble wrap to the ridge and spread it down the glazing bars.

Cut and fasten the bubble wrap around windows, vents and louvres so they can be opened.


Buy bubble wrap by the metre from garden centres. Choose polythene that is specifically designed for greenhouses, as it is UV-stabilised and should last for at least three years.

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