You don't really need any special equipment to build one.
Just enough layers of snow!
I have built one before just an ice axe, though i guess a pole/stick of anything of the sort would work too.
Draw a big square in the snow then just dig along the lines until it's as deep as it goes...
Then gently pull on the square of snow you have cut out until the first layer slides off. This your first block. Gently pull on the square of snow til the second layer comes off, this is the second block, etc etc.
Repeat for an hour or 2 and you have a good enough wind shelter.
We had to rest walking poles over the top though to be able to balance a decent enough amount of snow on it.
If you managed to do one in the
english garden i would be very surprised/impressed.