how much would it cost to built a gym in the garden of 60 sq metres?

[life1000]

how much would it cost to built a gym in the garden of 60 sq metres? we have finished foundation so this owuld be walls/ roof and windows/ doors, shower

Ask MrsDV. She is an expert on these matters :(

what is this MrsDV? is it a forum or a nickname?

Cashmere that was my first thought too!

Me too But I don't think she'd recommend the builders.

Mrs DV's neighbours built a very large building for illegal housing a 'gym' in their back garden.....

I would get a builder around to quote for you OP, after you check out planning portal.

Poor MrsDV.

Building costs are about £1000 per sq m.

Knock off the costs of the groundworks and putting in the foundations - it's possible to find the costs in the spons handbook (bible for quantity surveyors) which larger libraries would have.