Insulation of Portakabin

Hi,

I'm wondering if anyone has any knowledge or experience on the best/cheapest way to insulate a portakabin building which I use as my office. It's 30ft x 8ft and is ridiculously cold in there. It's a fairly old cabin, and has single glazed windows and as far as I know there is no insulation of the walls.

At the moment I have 2x 2kw heaters come on at 7am and stay on until 5:00. These alone don't heat the cabin as much as is required, so we also use a 2kw convector heater. The total is within safe loading but my elec bill is rocketing.

I know there are various options available for a residential house such insulating sheets, foam, window film etc, but I'm unsure if any of these are suitable/effective for a portakabin. Or if there's a better I hadn't considered.

Any info any can offer would be appreciated.
Thanks in advance
David

Is the portakabin directly in contact with soil? If so the metal will always be cold, first suggestion would be to remedy this possible issue first.
Then you need to specify your budget and finish you wanted.

Hi. It's not no, it's on a tarmac/concrete area in front of my warehouse.

Regards
David