diy hoop house this site has .pdf instructions - we made one (15x20) for a few hundred. There is a greenhouse supply place in Aurora (south of Canby) you can get the 5year plastic at. Get an off cut, cheaper!
Greenhouse guide: 13 incredibly useful tips. If you want the luxury of an in-greenhouse mains supply, some plumbing is needed. A greenhouse roof harvests a surprising volume of rainwater, so store it in butts. Watering techniques range from devotional use of a watering can to a semi-automatic system if you’re away from home a lot.- Telegraph