Building Your Own Greenhouse

If you’ve been thinking about buying and installing a wooden greenhouse in your yard, you should spend a few minutes reading this handy staff post on USA Gardening. It gives an easy step-by-step guide to building your own wooden greenhouse. So have a look before you go out and buy one.

If you live in an area that has early frost, you probably have a very short vegetable growing season. If you have a greenhouse, you can extend your vegetable growing season by quite a while. Unfortunately, greenhouses can be very expensive to buy. But you don’t have to buy one, you can build your own instead!

These simple guidelines and plans will show you how to go about it. While building your own greenhouse might take a bit longer than buying one and getting someone else to install it, it will save you a fair amount of money. So have a look at this great guide for some tips!

1: Install ground anchors
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Anchors to hold the pieces of 4″ X 4″ bought from hardware. USA $ 6.99 per unit. They are 36″ long.
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Use slegehammer to anchor the anchors. Insert a piece of 4″ X 4″ with before hitting the ground. Subsequently, insert anchors into a new 4″ X 4″. Length of 25′, needs 3 anchors.
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Replace the piece of 4″ X 4″ with the mass used for anchoring a new 4″ X 4″ treated wood 12″ or 1′ in length. Tighten bolts to trap this piece. In hardware, 4″ X 4″ retails at $ 8.99 USA per 8′ long Homehardware.
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Fill the hole around the anchor with crushed stone and compacted it with a heavy iron rod.
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Lay on top of the 4″ X 4″ a inverted double metal bracket “U”. In hardware about $ 1.49 USA. Use 2″ treated wood screws.
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And that’s it ! Anchors are ready to receive greenhouse base or foundations.
2: Attach the greenhouse base to anchors
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Various materials for the greenhouse construction. The spruce planks are used here. On the left, 2″ X 4 X 8′. At the center, 1″ X 3″ X 10′. Right, 4″ X 4″ wooden treaty. Bought everything from an hardware center).
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Greenhouse sitting area must be cleared of grass to prevent grass invasion on the greenhouse ground.
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A laser level can be used to ensure that everything is right.
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Here is the method to check the level between 2 bases anchors.
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Here’s how the press center anchor the both 4″ X 4″ 8′ long.
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For the center of the base, I suggest to make consolidating with 2 pieces of 2″ X 4″ above the seal 4″ X 4″. As support I add a block of concrete wall under seal for better stability.
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A block of concrete wall in the central joint for better stability.
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The corners of the base are fixed by means of two metal brackets. To stabilise this base corner, place it on a concrete block.
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Here, a rear view of building in progress. The grass has been removed piece by piece … work is very long !
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Here, a view of the front of the new garden greenhouse. You can see a concrete block was placed in the center of each 4″ X 4″ X 8′. Supported by compacted crushed rock.
3: Install the side walls structure
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To mount the lower walls, simply attach the 2″ X 4″ to 4″ X 4″ base horizontally.
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Thereafter, set pieces 2″ X 4″ between two 2″ X 4″ which are vertical. You can use the recovered pieces. This will give the solidity. Use 3″ treated wood screw.
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The 2″ X 4″ are cut angle of X degrees at their upper end to accommodate the parts which form the roof.
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Front right corner of the greenhouse.
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Left rear corner of the greenhouse.
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View of the left wall of the greenhouse.
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For the left and right wall of the backyard greenhouse.
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For the left and right wall of the garden greenhouse.
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Left and right walls of the greenhouse.
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A young worker supervising my work during the solidification of the walls. Through in a 2″ X 4″ is set between each two vertical 2″ X 4″.
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It is through the fixed flat treated wood screws 3″. At the top of the vertical 2″ X 4″, I screwed a 2″ X 4″ to give strength to the walls and roof.
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St Andrew Cross 1″ X 3″. (woodworking technique)
4: Build front and end walls frame
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Here are the 2″ X 4″ will be used to mount the roof structure. All sawing at an angle of X degrees.
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View of greenhouse front and side.
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Interior view of the installation of timber roof structure.
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Brackets used to consolidate the junction of planks 2″ X 4″ roof and walls.
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Brackets consolidate the junction of planks 2″ X 4″ roof and walls. These wives angle.
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Building the structure to support my old home recycled windows.
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Frame and installation of the door.
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Windows installation and adjustment crank. Recycled from old windows of the house (When I improve house).
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Interior view of the front end of the greenhouse.
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Far view of inexpensive greenhouse building ! Big job ! On this picture you can see my artificial creek project.
5: Frame a Greenhouse Roof
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Adding two central columns with 4″ X 4″ 10 feet. They are mounted on anchorages. On these columns, 2 beams 4″ X 4″ 12 feet long each.
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Attach the beams 12 feet with metal plates in the center.
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This requires a little adjustment. Note: Ideally should have put a support beam under the seal (where you can see the metal plate).
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A 2″ X 4″ temporarily installed can help us keep the planks from the farm to secure them to the central beam.
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Installation sides of the roof trusses. Work done !
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Everything is now stronger !
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Of work performed. The structure is well advanced.
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Installation of 2 pieces of 2″ X 4″ truss to solidify the structure. Note: Very handy for setting fasteners that help to hold the tomato plants.
6: Installation of polyethylene plastic film
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We are ready for the installation of plastic (tarp) polyethylene. Note: I suggest you get help from a friend to complete this step. Purchase and Warranty: I bought my roll of polyethylene to Farming Hardware Center. I bought the medium quality (Thickness: 4 micrometer). 5 years warranty.
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Setup of the greenhouse plastic roll before install it.
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For openings must pass the polyethylene film not on as if they did not exist. Thereafter, go around the opening with 1″ X 3″ screwed and cut with a utility knife inside.
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Be careful with sharp joints, especially the roof. They could rip your plastic sheet. A good sanding pieces of wood helps prevent everything. Polyethylene is a good material for Lean Greenhouse or attached greenhouse too.
7: Exterior Greenhouse Finishing
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To the base of the greenhouse can be laid in the earth. Ideal for creating new flowerbeds.
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A ramp to access to the greenhouse is useful and practical. We can then bring to a wheelbarrow.
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Front of the greenhouse. The windows open well and allow a natural ventilation.
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Installation of plate around the base of the greenhouse to prevent the weed to invade the greenhouse.
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Replace the ground up to ensure proper insulation.
8: Finishing the greenhouse interior
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Install hooks to attach ropes.
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Wood preservation with linseed oil cedar color.
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Front view of the greenhouse interior.
9: Shelves – Grow Boxes – Potting Bench
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Planter boxes construction / wooden boxes in the center and both sides of the greenhouse. Using recycled 2″ X 8″ from the old deck.
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Adding vertical posts and horizontal studs to solidify the greenhouse structure. Even during the winter the ground is still frozen. We can therefore work for the spring.
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Watering plants and additions hooks for storing tools. Very funny to gardening with this greenhouse planter boxes.
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Making a removable grid for cucumber vines. Mobile panel trellis!
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Build small potting bench for easy work. Over it, the seedlings trays.
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Retrieving a plastic laundry tub. Fill the hole and fill with soil. Ideal for planting and keep the area clean. Its a nice and cheap soil sink !
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The 1″ X 3″ above the tables were stained with linseed oil cedar color.
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Electrical box to heat during the spring. 60 amp circuit breaker installed.
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The plastic cover is very strong!
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Snow slides on the sides of the garden greenhouse. 90{a30e0c09ff70771d4c2559ca452283db427b609927687ae1d17157c286cad949} of the winter time, there is no snow on the roof. In addition, snowpack for insulation at the opening of the greenhouse in the spring. Pitch angle = 18 degrees

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