Since most of the success of a gh has to do with details, there's not much we can comment on based upon what you've shared. Solexx is excellent material, but unless you can pick it up yourself, you'll have a crating and shipping charge. Most places require a minimum order because sending a handful of panels is risky. The best price on the web is $36 for a 42" x 97" panel, and $70 for a 49" x 145" panel. I'm not familiar with the sizes you mentioned.

Are you planning on shingling part of the roof? Some folks construct multi-use garden sheds. Is that more along the lines of what you have planned?

Snow/wind loads are important on the roof, and your design must be structurally-sound to avoid such issues as racking.

Beyond the basic frame and covering, much of what is required has to do with heating and cooling. Without knowing your location or hardiness zone, there's not much else we can comment on based upon what you've shared.

For the size you've suggested, you could probably build a basic structure for the $900 you have available. You'll probably find, however, that to be able to grow plants inside year 'round (if that is, indeed, what you have in mind), will require additional funds.

Best of luck!

-Bruce

Well Im really need to get it built for the 600 total dollars,not 900,if its possible. Where did you find that good of deal for the solexx panels. I found some in 4x10 for 55 bucks, and 6x10 for 75 bucks. Its also a 90 dollar shipping charge. These are double pain panels. I do live in zone 6 and I just plan on using it as a greenhouse, not a tool shed. I do have a fair ammount of materials that I already have had from a prior addition build. My father in law did the build, and I assisted. I also saw a 10,000 btu propane heater and harbor freight for 120 bucks. Is that a decent heater, or do you know. thanks again,brandon

When you said your budget was $600, and you had a $300 gift card, I added the two together. Given the materials you have, it's possible you may be able to build a suitable structure, but without knowing your design or available parts, your guess is as good as mine. Don't forget the moulding and tape for your Solexx panels -- they can be pricey.

In order to calculate your BTU requirements, you first need to decide what sort of plants you plan on growing. Will it be a seed-starter, or year 'round structure? Knowing what you plan to grow will give you your minimum interior temps during the winter. Use the USDA hardiness zone map to determine your lowest possible ambient winter temps. There are online calculators available to give you your BTU requirement.

In a structure as small as yours, I would go with a vented propane heater...if propane is your choice. The one you refer to is most likely non-vented, and you'd have fume issues. I think if you're insulated well, one or two 1500-watt electric heaters would be less problematic.

If the structure is to be used only as a gh, then don't shingle your roof. (Again, I'm guessing. You mentioned shingles in your original post.) Link to the Solexx prices I mentioned is below.

-Bruce

Here is a link that might be useful: Solexx panels

I just read your other post about the HF propane heater. I understand your concerns about electric. But you're going to have to go through the exercise I described above before you can determine your BTU requirements. THEN...you can research appropriate heaters.

-Bruce

I did all the work on the btu factors and it was 9600 btu's. I preferred to incorporate the shingles based on the design that I have. I was not sure how much all the H brackets and the foil tape would run. Also I live in the country, I lose power about 2 times a year. What happens when I lose power? Thats why I preferred gas heat. thanks