See step-by-step how to use recycled windows, pallet wood, and old metal roofing to build a greenhouse.
As an avid gardener, I’ve always dreamed of having my own greenhouse – a cozy oasis where I could nurture seedlings, escape the winter chill, and grow beautiful plants year-round. But new greenhouses can cost thousands of dollars, way out of reach for my budget.
So I decided to take a DIY approach and build my own greenhouse from recycled and repurposed materials. The result? A gorgeous, functional greenhouse that cost me next to nothing! Here’s how I did it.
Planning With What You Have
I didn’t create a master plan or scale models before beginning my greenhouse. I just started collecting interesting recycled building materials, keeping an open mind for how I could use them. An old screen door, a stack of free pallet wood, some salvaged windows – these were my starting raw materials.
Over time, a vision started coming together in my mind. I imagined how the parts could fit together into a small but sturdy greenhouse. Rather than being restrictive, the lack of detailed plans allowed me room for creativity and on-the-fly problem solving.
Sourcing Materials
Here’s what I scavenged for my upcycled greenhouse build:
- Windows – I posted on local online groups asking for old windows and doors. Several people had windows from old home renovations that they were happy to get rid of. I cleaned up ten variously sized windows and checked for cracks.
- Pallet wood – I found free pallets behind local stores. I disassembled them with a pry bar to get boards in good condition.
- A screen door – this came off our old front door during a home remodel. The screen mesh would let in airflow without letting in pests.
- Corrugated metal roofing – I found this for free on Craigslist. The wrinkled pattern looks cool and it’s durable for rain and snow.
- Wood for framing – I used pressure treated 4x4s and 2x4s purchased new for safety and rot prevention.
Choose a Location
I recommend situating a greenhouse in part sun, part shade. Too much sun can overheat plants on hot days. My spot gets morning sun and afternoon shade.
Make sure to level the ground. Use gravel, pavers, or poured concrete as the floor to provide drainage.
Basic Structure and Framing
Construction was straightforward but physically demanding. For the foundation, I dug holes for the 4×4 posts, poured concrete in the holes and set the posts. This created an instant frame to build on.
I attached horizontal 2x4s between the 4x4s to complete the basic rectangular frame. The framing determined the final size – about 8 feet wide by 12 feet long.
For windows, I built wooden boxes from 2x4s that created a platform for the windows to sit on and be screwed into. The varied window sizes made fitting them together a fun puzzle.
The salvaged screen door was perfect for covering one of the end walls. I framed it like a window then attached the actual door.
I used the pallet wood boards for siding on parts of the frame that weren’t covered by windows or the door. The mix of materials gave my greenhouse a funky, upcycled style.
Topping It Off
For the peaked roof, I cut two long 2×4 boards and nailed them together at the top to make an A-frame. I secured this ridge beam to the top of my wall frames.
From there I cut and attached individual pallet boards at an angle down from the ridge to the walls. The corrugated metal panels went on top, allowing light through the translucent sections.
Finishing Touches
In total, building the DIY upcycled greenhouse took about 3 weeks of weekends and evenings – quite an undertaking but so rewarding!
To make the space usable, I added:
- Shelving units made from more pallet wood
- A gravel floor
- Benches near the perimeter
- Electricity running from the house for a space heater and grow lights
The finished greenhouse is cozy and practical, with rustic charm. That first winter was a joy, gardening among tropical plants as icy winds blew outside!
Lessons Learned
While thrilling to complete, an undertaking of this size taught me some valuable lessons:
- Don’t rush construction or cut corners on important structural elements. Slow and steady creates lasting results.
- Use quality weather-resistant wood for framing – it’s an investment that prevents rot and damage long-term.
- Expect projects to take longer and cost more than initial estimates. Building materials and unforeseen complications add up.
- Check for codes and permits in your area. Rules vary for structures like greenhouses to make sure they are safe.
- Have helpers! Many hands make light work, and company makes the process more fun.
With my upcycled greenhouse going strong after two years, it was an incredibly rewarding DIY project. Though it requires maintenance like any structure, I couldn’t be more pleased with the results. I encourage anyone who gardens to try their hand at repurposing unneeded materials into a unique greenhouse. Let your imagination transform trash into a beautiful treasure!