Snow,

There an awful lot to define before you can expect decent answers to your
question.

just for example:

location ( where you live)
siting on your site, relative to the sun
what you want to do inside the greenhouse... annuals, veggies, propagation
of orchids or other specialties..and lots in between

Hobby or business? do you need town permits for this structure?

how much of the year do you expect to use it, how you will heat it AND cool
it, what your water source will be....

without knowing these things, I think any answers are just shots in the
dark.

Sue
Western Maine



"snow" wrote in message
news:fhTce.2235$KP.1581@trndny02...
I am hoping to build a greenhouse about 15 feet by 30 feet. I am looking
at
a metal frame with high quality plastic for covering.
Anyone built one themselves? I am interested in the costs and types of
design.
This will be a free standing greenhouse about 10 feet from my garage. Any
information apppreciated. I have a carpenter friend who is willing to help
me build when I find a good design.