Indoor = clients year round, higher revenue
Outdoor = seasonal clients, fluctuating revenue
I play in Denmark and play at a facility with 15 indoor courts and 4 outdoor. The indoor courts are booked 3 weeks in advance and peak time is 1pm-9pm. I’ve never known anyone to pick outdoor. But then again, if that was the only option I’m sure people would book them.
I think if the cost of materials for an indoor and outdoor court is the same, then prioritize finding an indoor venue. UK’s weather is crap (like Denmark). Rain, wind, time it takes to dry the court… and a canopy? tbh I really think a canopy would be so annoying for lobs, balls that get smashed out and a player wants to run out and keep it in play etc.
Unless you’re in Asia, or Spain/portugal, I really don’t see it being a good business model. Especially not in the UK.