How to Build a Greenhouse Cheaply and Well (2024)

Greenhouses offer numerous benefits. In colder climates, they extend the growing season. You can start seed and seedlings earlier and harvest crops later. A good greenhouse also can let gardeners raise plants that would not otherwise grow in their climate zone.

In addition, because they are enclosed, greenhouses can protect your plants from marauders like birds, rabbits, deer, and raccoons. A greenhouse can also prevent theft or unwanted attention from nosy two-legged mammals (i.e., humans). If you are careful, a greenhouse can discourage insect infestations and disease in your plants too.

Despite their many advantages, greenhouses can still be expensive. The average cost to have one professionally built is more than $10,000. The price of lumber has been skyrocketing lately, adding even more to the expense of building greenhouses that use wood.

You can find greenhouse kits at nurseries, in some hardware stores and online, but these typically cost hundreds or even thousands of dollars.

Fortunately, there are alternatives. You don't have to be wealthy if you want to enjoy the advantages of a greenhouse for your plants. Read on to discover these suggestions for cheap ways to build a greenhouse, complete with misting or irrigation, from DripWorks.

Hoop Greenhouses

One of the easiest and cheapest ways to build your own greenhouse is to use plastic sheeting, which is readily available at most hardware stores. Typically, you will want sheeting that is four or six mils thick.

First, you will need to construct a frame to attach the plastic sheeting to. The frame could be made of PVC pipe and PVC connectors. Other choices include fence mesh and even tree saplings.

You can either attach the frame to a wooden base you build of 2 x 6 lumber or anchor the frame into the ground. By bending the frame into a hoop shape, you ensure rainwater will run off the greenhouse rather than pooling on top. Attach the plastic sheeting to the frame with nails, screws, zip ties or any other fastener that is convenient and sturdy.

You can make this style of greenhouse virtually any size you want. It's possible to build this kind of greenhouse for around $50. Overall, it's estimated that costs run about $1 a square foot.

If you live in a windy spot, you might want to consider anchoring it to the ground with lines and stakes, much as you would a tent.

Recycled Storm Windows and Doors

Using recycled storm windows and doors to build a greenhouse is good for your budget and the environment as well as your plants. You may be able to acquire glass doors and windows free or cheap online or at a local recycling center.

You can attach these upcycled doors and windows to a wooden frame. To cut costs even further, you can simply join the doors and windows to each other.

Another option is to surround a raised bed with straw bales. Next, simply lay a storm window or door over the raised bed to make a cheap, simple, and effective greenhouse.

Other Recycled Greenhouse Options

Folks have used various kinds of plastics, like CD cases and plastic bottles, to make greenhouses. These generally take a little more know-how and skill to build, but they help keep an all-too-common material out of the waste stream.

We hope these tips on how to build a greenhouse cheaply have been useful. If you have questions or are looking for advice on drip irrigation for your new greenhouse, feel free to call the friendly staff here at DripWorks toll-free. We are also available via instant chat, phone and email.

How to Build a Greenhouse Cheaply and Well (2024)

FAQs

What is the most inexpensive way to build a greenhouse? ›

The most inexpensive way to build a greenhouse is to purchase a standard greenhouse-building kit from a hardware store.

What is the cheapest material for a greenhouse? ›

Pressure-treated lumber or cinder blocks are budget-friendly options that provide adequate support. For flooring, consider using pea gravel or landscape fabric. These materials allow for good drainage, which is crucial for a healthy greenhouse environment.

Is it cheaper to build or buy a greenhouse? ›

If you purchase a standard greenhouse kit with no frills, it will likely cost less than it would to build a greenhouse from scratch. However, if you want a customized large greenhouse, it will be more cost effective to build it yourself.

What is the easiest base for a greenhouse? ›

Integral Base

This is by far the easiest option, as it does not require any further building or construction, as it forms part of the frame itself.

What direction should a greenhouse face? ›

For those in the Northern hemisphere, the length of the greenhouse (longer dimension) should face south as this is where the majority of light comes from. The north side of the greenhouse will collect little, if any light, and should be insulated to reduce heat loss.

Is glass or plastic better for a greenhouse? ›

Cost and Efficiency of Glass and Plastic Greenhouses

On the flip side, glass greenhouses, though commanding a higher upfront cost, potentially offer better long-term value. Their durability and minimal maintenance needs can make them a more economical choice over time despite the initial investment.

What is the most expensive part of a greenhouse? ›

The covering material of the greenhouse, also known as glazing, is usually the most expensive component of the structure. It is also one of the most important because the glazing is what allows the entry of light and heat into the greenhouse.

What is the best glass for a greenhouse? ›

Tempered glass

This makes it less likely to break than regular glass, meaning it's a good choice for greenhouses in areas with high winds or hail. Not only that, but tempered glass is a good insulator and will help retain the heat in your greenhouse.

What is the easiest thing to grow in a greenhouse? ›

Tomatoes, Peppers, Cucumbers, Zucchini and Lettuce

Tomatoes, peppers and eggplants are greenhouse darlings and will thrive in the warmth. Cucumbers, squash and zucchini will also work well and growing them up a trellis or wall is a great way to save a bit of space.

Does a homemade greenhouse need ventilation? ›

Your greenhouse needs vents to allow fresh air to move in, but you should also have some kind of circulation fan to keep the air moving throughout the entire greenhouse so that it will reach all of your plants. Many people fail to realize how ventilation affects pests within greenhouses.

What is the cheapest way to build a greenhouse? ›

One of the easiest and cheapest ways to build your own greenhouse is to use plastic sheeting, which is readily available at most hardware stores. Typically, you will want sheeting that is four or six mils thick. First, you will need to construct a frame to attach the plastic sheeting to.

What is the best wood for a greenhouse? ›

The general consensus being that red cedar is the best wood for a greenhouse frame with its self-oiling properties, lack of knots and its resistance to contortion. Greenhouses made from red cedar tend to be warmer in the winter and cooler in the summer, making for a better growing environment than aluminium ones.

How do you keep a cheap greenhouse warm? ›

Other Cheap Ways of Heating a Greenhouse
  1. Inspect and seal your greenhouse. Look for cracks or gaps that could let in the cold and seal them with weatherproof tape or silicone caulk. ...
  2. Divide your greenhouse. ...
  3. Install thermostat-controlled heaters. ...
  4. Use heat mats for targeted warmth. ...
  5. Create DIY thermal mass heaters.
Nov 20, 2023

How much does it cost to build a greenhouse from scratch? ›

A professionally built greenhouse costs around $11,000, with most homeowners paying between $2,000 and $25,000. For a smaller growing space at a considerably cheaper price, homeowners can install a smaller, prefabricated greenhouse, buy a greenhouse kit, or DIY it.

What is the alternative to a greenhouse? ›

A cold frame is simply a box with a sloping glazed lid (either glass or plastic glazing) and is a traditional means of protecting plants to supplement, not replace, a greenhouse. Cold frames are used to harden off plants, overwinter plants, sow seeds that need cool conditions and to root cuttings.

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