12×16 Greenhouse Plans – Free PDF Download

This step by step woodworking project is about 12×16 greenhouse plans. I had a few requests for a 12×16 easy to build greenhouse and you know I cannot refuse a good challenge. That is why I’ve decided to design this wooden greenhouse with a gable roof, that is both pretty and sturdy. The greenhouse has 6′ side wall and a maximum height of 9′. You can add lots of unique features to the greenhouse, such as automatic vents or doors, so you can control the climate. In addition, you can cover the greenhouse with glass, film or poly-carbonate sheets.

The location of the wood greenhouse should be set as to benefit from sunlight, most of the day. This aspect is essential for your future crops, as the plants need morning light to develop properly. Place the solar greenhouse far away from buildings or trees. If this is not possible, try to build it as to get the morning light from east. Before building the wood greenhouse, level the ground and excavate the soil if necessary.

If you want build a durable greenhouse, you should choose the materials with great care.  Buy pressure treated lumber or cedar, making sure the studs and beams are perfectly straight. In addition, examine the studs and select the lumber without visible signs of damage. Use the right woodworking techniques, as to join the wood properly and a spirit level to plumb the walls before setting them into place.

 

Made from this plan

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12×16 Greenhouse Plans

Building a 12x16 greenhouse

Building a 12×16 greenhouse

 

Materials

  • A – 2 pieces of 4×4 lumber – 144 long, 2 pieces – 192″ long BASE
  • B – 10 pieces of 2×4 lumber – 16″ long STAKES
  • C – 2 pieces of 2×4 lumber – 192″ long, 9 pieces – 72″ long, 4 pieces – 22 1/2″ long SIDE WALL
  • D – 2 pieces of 2×4 lumber – 137″ long, 7 pieces – 72″ long BACK WALL
  • E – 2 pieces of 2×4 lumber – 137″ long, 7 pieces – 72″ long FRONT WALL
  • F – 2 pieces of 2×4 lumber – 192″ long, 9 pieces – 72″ long SIDE WALL
  • G – 2 pieces of 2×4 lumber – 25 1/2″ long, 1 piece of 2×6 lumber – 192″ long RIDGE BEAM
  • H – 18 pieces of 2×4 lumber – 77 3/4″ long, 2 pieces of 1×3 lumber – 192″ long RAFTERS
  • I – 2 pieces of 2×4 lumber – 65″ long, 2 pieces – 36″ long, 1 piece – 29″ long DOOR
  • J – 2 pieces of 2×2 lumber – 22 1/2″ long, 2 pieces – 19 1/2″ long 2xVENT

Tools

Time

  • One Week

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12×16 Gable Greenhouse Plans – Free PDF Download

Building the skids

Building the skids

The first step of the project is to build the base for the greenhouse. Therefore, all you need to do is use 4×4 pressure treated beams for the skids. Use a circular saw to make parallel cuts and then remove the excess with a chisel. Smooth the surface with sandpaper.

Assembling the base of the greenhouse

Assembling the base of the greenhouse

Select the location for the greenhouse, making sure it gets a lot of natural light so the plants will grow healthy. Level the surface and then lay the beams, as shown in the plans. Make sure the corners are square and then drill pilot holes, before inserting the 3 1/2″ screws.

Stakes

Stakes

 

Fitting the anchors to the greenhouse base

Fitting the anchors to the greenhouse base

Use 2x4s for the anchors. Cut one end of the stakes in V-shaped, so you can fit them to the ground easily. Then use 2 1/2″ screws to secure the stakes to the base of the greenhouse.

Front wall frame

Front wall frame

Next, you have to build the wall frame for the front of the greenhouse. As you can easily notice in the diagram, you need to frame the door opening. I went conservatively so I made it 3′ wide, but you can plans with the dimensions and make it suit your needs.

Lay the components on a level surface and then assemble the frame with 3 1/2″ screws. Drill pilot holes through the plates before inserting the screws to prevent the wood from splitting. Make sure the corners are square and align the edges flush.

Back wall frame - 12x16 greenhouse

Back wall frame – 12×16 greenhouse

Continue the project by assembling the back wall. You can add a door do this wall as well, if you want an easy access to the interior.

Side wall with vents frame - 12x16 greenhouse plans

Side wall with vents frame – 12×16 greenhouse plans

Next, we need to frame the side walls. As you can notice in the plans, I have added 2×4 supports for the vents. Drill pocket holes at both ends of the supports and then lock them to the studs with 2 1/2″ screws. You can adjust the size of the vents, as well as their location. I am no gardener, so I let that to you, if you have more experience.

Side wall frame - 12x16 greenhouse plans

Side wall frame – 12×16 greenhouse plans

Build the opposite side wall for the 12×16 wooden greenhouse.

Assembling the frame of the greenhouse

Assembling the frame of the greenhouse

After assembling the wall frames for the greenhouse, you need to assemble everything. Fit the wall frames to the skids and align the edges flush. Plumb the walls with a spirit level and then drill pilot holes through the bottom plates. Insert 3 1/2″ screws to lock the wall frames to the base. Next, lock the adjacent wall frames together with 2 1/2″ screws.

Fitting the ridge beam

Fitting the ridge beam

Use 2×4 lumber for the ridge beam supports and 2×6 lumber for the ridge beam. Drill pocket holes at both ends of the supports and then secure them to the middle of the front and back wall plates , using 2 1/2″ screws. Make sure the corners are square and align everything with attention. Fit the ridge beam and don’t worry, the structure will be way stiffer when adding the rafters.

Building the rafters

Building the rafters

Talking about the rafters, I want to show you how to cut them. Use a miter saw to make the angle cuts. But before making the cuts, you need to mark the lines on the 2×4 slats.

Fitting the rafters

Fitting the rafters

Fit the rafters to the top of the greenhouse and then place them every 24″ on center. Drill pilot holes and insert 3 1/2″ screws to lock the rafters into place tightly.

Fitting the end rafter slats

Fitting the end rafter slats

Fit the 1×3 slats to the end of the rafters, so you can protect the film when stretching it over the greenhouse.

Building the door

Building the door

Build the door from 2x4s, as shown in the plans. Drill pocket holes at both ends of the vertical supports and at both ends of the middle support. Make sure the corners are square and use 2 1/2″ screws to lock everything with attention.

Fitting the door

Fitting the door

Fit the door to the front of the greenhouse and lock it into place with hinges. Add a latch so you can close the door properly.

Building the vents

Building the vents

Use 2×2 lumber for the frames of the vents. Align the edges and make sure they are perfectly square. Drill pilot holes and insert 2 1/2″ screws to lock everything together tightly.

Hitting the vents

Hitting the vents

Fit the vents to the openings and lock them to the top supports with hinges. Install the automatic vent so you can control the climate inside the greenhouse with ease.

12x16 greenhouse plans

12×16 greenhouse plans

Last but not least, you need to attach the film to the exterior of the greenhouse. Use 1×2 trims, along the framing of the greenhouse, so you can lock the film into place tightly.

12x16 greenhouse plans - side view

12×16 greenhouse plans – side view

This is a super easy to build greenhouse, so you shouldn’t feel intimidated by the task. Just follow the instructions religiously and at the end you will have a brand new greenhouse in the backyard.

How to build a 12x16 greenhouse

How to build a 12×16 greenhouse

You could apply a few coats of treatment over the wooden framing, so they withstand the elements.

Smart Tip: Apply a few coats of stain or exterior paint to the components, in order to protect them from decay and water damage. Make sure you choose quality components taht suit your needs and tastes. Make sure you check out my 10×16 greenhouse plans and my 8×8 greenhouse plans

 

 

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  1. Don Lafontaine

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