Greenhouse lumber foundation

If you want to grow plants that don’t develop in the climate you live in, then the greenhouse is the solution. But before you build the greenhouse, you must first build the greenhouse foundation. Even though the metal frame with the glass or composite panes that form the greenhouse doesn’t weigh as much as a garage, it still need a good foundation.

From the multitude of material you can choose from to build the foundation, we will discuss about the upsides and downsides of brick, concrete and timber.


After smoothing and leveling the ground, you can interlock  brick paves, and the result is comparable to concrete. This method is labor intensive, but as much as the concrete option. Another advantage is that unlike the concrete, in case of a crack, bricks are easier to replace.

You can choose between just interlocking the bricks, or use mortar to glue them together. The decision to add mortar will is more costly and labor demanding, but the foundation will be firmer. The bricks may cost more than the materials needed for pouring the concrete, but the labor-cost ratio is good.


Besides being the most durable option, the concrete foundation has strenght and uniformity. If it’s properly framed and sealed, the concrete foundation will last a long time and avoid the wrath of the elements. If in case of small greenhouses we talk about concrete as an option, in case of large greenhouses the concrete is the only suitable solution, due to the great frame weight.

The drawback of this option is that it can be expensive and both time and labor consuming. If you hire somebody to pour it, it will get you up to several thousands of dollars, while doing it yourself will exhaust you.


The third option is timber, or lumber. It is important to know that all structures (houses, garages and other) have their timber foundation secured by a concrete one. That’s  is why these option is suitable only for small greenhouses. After you have flattened the and leveled the land, here is what you need to do. Take 4 to 6 concrete support blocks with built in brackets, put the 4×6 floor beams and on top of that put all the 2×6 floor joints you need. Add plywood, then linoleum, and there you have it. If the greenhouse is a small-sized one, this option is the cheapest solution.

Besides concrete, lumber and bricks, there are other materials that can support your greenhouse. Before you decide on the material, think about cost, time, labor and the strength you need to do it.

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