well if it's growing stuff then yes pt....but if it were for say an indoor farmers market or something like that i'd be tempted to consider steel portal....if you're looking to dodge planning be careful cos the end use could matter...eg if you had sheep in one the planners might roll their eyes and say ok....but if you wanted to sell sh cars from one they'd say 'oi he's trying to circumvent planning'....if that makes sense
its growing stuff, specialist stuff for a niche market but certainly is farming