I really don't remember what my greenhouse cost but looking at Charley's Greenhouse website, it would have be a lot now. We have a pack of really crazy friends who got together and poured the foundation, put in the floor and built the greenhouse (of course, we were 20-something years younger). Everyone got to put their name and handprint in the cement - unfortunately, we didn't plan ahead well and the greenhouse walls sit on the handprints and signatures.
Just did the calculation of what my greenhouse would cost now - $20,000! Yikes!
