Approximate Project Cost can be anywhere from free to $100 per bed. Here is a detailed cost breakdown based on Lowes pricing in 16066 and bolts from Tractor Supply (by weight) http://bit.ly/H8tdh5
UPDATE (2014) -
Note: the above pricing is based on my original design. You can save a TON of money by using 2x3 studs and painting them. You can save even more by using reclaimed lumber for free from craigslist.
You can save signifcant amounts of money using a "bagster" disposable dumpster available at Lowes or Home Depot for $30.
After you nail the bagster garden to your frame take a box cutter or other sharp knife and cut the bottom out of it so that it has direct contact with the ground. (outlined in the bagster step)
My garden beds are a combination of a few things I like.
1- would be raised bed gardening and in particular square foot gardening
2- Hugelkultur - this is a technique where wood is buried inside of the garden bed which greatly reduces and even can eliminate the need for irrigation. Don't take my word for it... read this, and listen to this and this For the purposes of this instruct-able I'll ask you to suspend your disbelief and lets just assume your on board with hugelkultur. If you want to debate it take it up with Paul or Jack.
Update (2014) - I never water these gardens and tomatoes and peppers and everything else grows just fine.
Tools I used
Pipe clamps (not 100% required)
Miter Saw (can use circular saw for all cuts, but it makes it easier)
Carpenter's Pencil or Sharpie
Mattock (not required but suggested)
Kreg Jig - I used the Jr. version
I owned a Kreg Jig so that is what i used. If you do not want to buy a jig simply use 3" deck screws. Be sure to pre-drill each and every hole to prevent the wood from splitting.
3" 5/26 galvanized lag bolts Quantity: 12
5/16 lock washers Quantity: 12
Plastic cap roofing nails: 50 to 100
Plastic cap roofing nails work best for Ondura or the
If using galvanized roofing please let me know what fastener you used in the comments.:
Materials to cover your garden with:
Ondura Corrugated Roofing Sheet ** Quantity: 2
Galvanized roofing. The Ondura is on it's 3rd season and still working, but it is showing signs of wear. I suspect metal roofing would be more durable
Break down pallets to sheet the frame. I would put the frame in it's final destination first. I would line the inside with plastic sheeting or tarp first before filling which will make it last a lot longer. Used plastic cap roofing nails.
Reclaimed materials from the local dump or craigslist. Any type of plastic or metal sheets, plywood etc. If you are using wood I would coat the inside with tarp or plastic and paint the outside with exterior grade paint.
Pressure Treated 8' 2x4 lumber* Quantity: 9 Update (2014) - Add 2 additional (approximately) 2x4s
Paint the outside of the beds after they are installed.
Idea #2 Reclaimed wood from craigslist or construction projects. This is what i used for my bagster garden. I stained them with a fence stain after they were assembled. I manually removed all the nails with a simple hammer.
If you want to save some time you can buzz everything off with an angle grinder.
Idea #3 Untreated 2x3 studs. These are $1.80 each. If you are using the bagster garden I think these would be ideal. For best results paint or stain the frame prior to installation of the bagster garden. This would bring down the price of the garden to a significant degree.
2.5" Kreg Screws Quantity: 56
Update: If not using the kreg jig get 3" deck screws and make sure you have a drill bit to predrill all the holes.
Note: I would suggest getting your bolts at a place that sells them by weight such as tractor supply. It will end up being a lot cheaper.
Cut List for 2x4s (or 2x3s)
8' (note does not require cut) Quantity: 4
4' Quantity: 4
17.5" Quantity: 14 Update (2014) - +8 additional supports.
* My research indicates that current, modern, pressure treated lumber is safe for use in the garden. Please do your own research and present facts rather than flames should you choose to comment on this material. A more expensive alternative would be cedar or redwood.
Please before you spout off about "arsenic" in the comments be aware that ACQ treated lumber does not contain this substance!
**Ondura is light, easy to work with and cheap. However if you are uncomfortable with plastic in your garden you can use traditional metal roofing for this project