The final dimensions of the greenhouse on the outside is 8×12. The inside measures 7’4″x11’4″. Two storm doors, four shelves, two fans, outlets for lights and heat mats, and a vent in the roof. This gave us enough space for 3 heat mats, 3 lights, and 12 flats per shelf. So, 12 heat mats, 12 lights and 48 seed flats. There will be a shorter shelf added to the top to hold a bit of this and that!
The cost in 2019 was around $1,500 however, prices have changed tremendously over the last few years! We had bits and pieces we found in the old barn, and scraps left over from different jobs my husband had completed as a general contractor.
We suggest finding some scrap lumber pieces at the hardware store, look through friend’s barns, going to construction sites – to talk to the crew about getting scraps – or try putting out advertisement’s on Facebook looking for left over pieces here and there if you have the time to do so, and also consider finding different places to purchase things other than a specialty store – ie Lowes, Hardware Sales, Re-Store, Habitat for Humanity…..get creative!
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Click here for A video tour of the greenhouse
Materials List:
Lumber: *keep in mind if you pick up utility grade lumber,(that is not the typical dimensions) you can save money, for this build everything was 6 ft material.
- 3 @ 16ft long treated 4×6 for ground contact to build the frame.
- 24 @ 2x4ft & 16 @ 4×4 tight knot cedar for framing walls and rafters
- 4 @ 4x4x8ft standard and better Douglas fir
- 1 @ 2x6x12ft Douglas Fir used for ridge board
Tin: re-purposed found in the loft of the barn, left over from the barn build 36 years ago.
- 3 @ 2x14ft 29 gauge galvanized metal roofing
Double wall Polycarbonate for side walls:
- 9 @ 2×8 ft from Home Depot, it was 40% the cost if we had purchased it at the specialty green house supply store.
Single wall polycarbonate for roof:
- 6 @ 2x12ft
- 12 @6ft Ribbon Board
Fans: Bathroom wall fan from Hardware Sales. 50 cfm. Currently in process, going to experiment with one for now. Might do two giving us 100 cfm, estimating the building volume at 900 cuft, making it so we can exchange the air every 9 minutes. **updates to come** As of 2/28/2024 – we have not used the fans….
Storm Doors: $140 each at Home Depot. We opted for one at each end due to the placement of the greenhouse – it makes it easier to go back and forth as well as the benefit of airflow. This made it so I do not get a work bench, but he tells me he will make a drop down work bench.
Hardware:
- Structural assembly 5 1/2 inch architectural screws exterior grade
Insulation: placed around the tin for warmth, put in place & spray foam applied
- 2 @ 4x8ftx1 inch Owens Corning pink board
Shelving: Trex decking – Not necessary to permanently install for ease of drainage and removal when cleaning. We had a bunch of scrap left over, so we just ran with it. If we did it over again, we might use cedar because it’s cheaper, or wire – however, the trex keeps it nice and warm when starting seedlings and it won’t rot. The downside is that it is super heavy and kind of pricey!!
- 12 @ 1x6x16ft cut to fit the area
Electrical: With the need to plug in heat mats & grow lights there was a need for many outlets. We also needed overhead lights, and power for the fans. **updates to come**
Flashing:
- 4 @ 1 inch Z strip metal drip edge
I love this adorable seed starter! Rusty tin is my favorite, it adds such charm!
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Nice construction info….. and I too love the aluminum . Your flowers are beautiful ! Great seeing you today .
Teresa
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It was great seeing you too & visiting…I hope I didn’t gab your ear off too badly!!
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What was the final cost
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Great question! I’m updating the page to reflect that, prices were a lot different in 2019! It was roughly $1,500. Hubby did all the work and we did some digging for bits and pieces.
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