How to make a den in the garden for rainy days

I have an area in the garden that I need to make water tight to make a little hidden area in our garden or smokers when it rains or for when you just want to chill and listen to the sound of the rain.


I want to make it like a little fairy grotto to include a small wood burner (has to be safe in enclosed area) with some seating and table area and lots of fairy lights or lantens.


I would like a little haven at the bottom of our garden.

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