What is the cheapest type of greenhouse to build?

Cold frames are the cheapest option, starting around $150 for a small DIY version. They extend the season by 4–6 weeks but are not year-round structures. For year-round growing, hoop houses are the most affordable option, typically $200–$2,200 depending on size.

What hidden costs do beginners miss when budgeting for a greenhouse?

The four most common hidden costs are: (1) Foundation or base preparation ($150–$700) — kits don't include this; (2) Heating system ($80–$800) — essential in cold climates; (3) Ventilation hardware ($60–$300) — prevents overheating and disease; (4) Building permits ($0–$300) — required for permanent structures in many areas.

How much does a greenhouse cost to run per year?

Annual running costs for a hobby greenhouse are typically $200–$600 for electricity or propane heating in cold climates, plus water and minor repairs. In temperate or warm climates, annual costs drop to $50–$200. The type of covering (polycarbonate vs. glass vs. poly film) significantly affects heating costs.

Greenhouse Cost Calculator: How Much Does a Greenhouse Cost?

Q: How much does a greenhouse cost?

A greenhouse costs $150 to $6,000+ depending on type and size. A basic cold frame runs $150–$350. A small hoop house costs $200–$500. A medium freestanding greenhouse with accessories typically totals $1,500–$3,500 all-in. Budget an additional 30–60% beyond the kit price for foundation, heating, ventilation, and setup.

The real answer to "how much does a greenhouse cost" is: depends on 3 things. The type of structure you choose, the size you need, and what your climate demands. A cold-frame in Georgia and a freestanding greenhouse in Minnesota aren't even the same category of purchase.

Most beginner budget guides miss half the cost. They quote the kit price. They forget the foundation, the heating system, the ventilation, the shelving — everything you discover you need after the structure is already up. I've been through it. Here's the honest breakdown.

"The kit price is about 60% of your actual first-year cost. Budget for the other 40% before you click buy."

Use the calculator below. Select your type, size, and climate zone. You'll get a range — low, mid, and high — based on real product pricing. Then scroll down for the hidden costs that beginners consistently forget, plus a shopping list you can take to the hardware store.

Greenhouse Cost Calculator

Make 3 selections — your estimate updates instantly.

Step 1 of 3

What type of greenhouse are you building?

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Lean-to

Attached to an existing wall. Shares heat, uses less material.

$$$

🏡

Freestanding

Classic standalone structure. Most flexible placement.

$$$$

⛺

Hoop House

Curved tunnel frame with poly cover. Budget-friendly starter.

📦

Cold Frame

Low box with a clear lid. Season extension, not year-round.

Step 2 of 3

What size are you planning?

🌱

Small

6×8 ft. Perfect for testing the hobby. Easy to heat.

Starter

🌿

Medium

8×12 ft. Sweet spot for hobby growers. Room to work.

Cost Breakdown

Based on your selections

Structure / kit

—

Accessories & climate setup

—

Foundation / permits

—

Total estimated budget

—

Budget

—

DIY + basic materials

Mid-range

—

Quality kit + accessories

Premium

—

Best materials + full setup

💬 Kristian's Take

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What the kit price doesn't include

The Hidden Costs Beginners Always Miss

Every beginner I've talked to says the same thing after their first season: "I didn't budget for that." Here are the four surprises that push your real cost 30–60% above the sticker price.

🪨

Foundation or Base

Your greenhouse needs a level, solid base — gravel, paving slabs, or concrete. Without it, frames shift, doors won't close, and water pools inside. Most kits assume you already have this.

$150 – $700

🔥

Heating System

In cold climates, a heater is non-negotiable — not a nice-to-have. Electric fan heaters, propane, or electric soil cables for seedlings. This cost depends heavily on your winters and structure size.

$80 – $800

🌬️

Ventilation

Greenhouses overheat fast in spring and summer. Automatic vent openers, louvre vents, or clip-on fans keep temps in check and prevent disease. Often sold separately from the kit.

$60 – $300

📋

Permit & Site Prep

Permanent structures in many areas require a building permit — even backyard greenhouses. Check your local rules before you buy. Cold frames and temporary hoop houses usually skip this; freestanding kits often don't.

$0 – $300

📬 Free Resource

Get your personalized
greenhouse shopping list

Based on your type, size, and climate — I'll send you a curated list of what to actually buy, where to find it, and what to skip.

Specific product recommendations by climate
Checklist of everything needed before day one
Common budget mistakes and how to avoid them
Kristian's personal supplier picks

What to do next

Know Your Budget? Now Pick Your Structure.

A cost estimate tells you what to budget. The buying guide tells you which specific type fits your climate, yard, and growing goals — and what to watch for when comparing kits.

Read the Greenhouse Buying Guide →