How much does a small backyard greenhouse cost?

A compact walk-in kit in the 6x4 to 6x8 range typically runs $200–$800 depending on frame material and covering. Soft PE-cover walk-ins like Quictent or Outsunny sit at the low end, around $110–$340, while polycarbonate-panel kits like the Palram Canopia Harmony 6x8 run $744–$829. A tabletop or 4-tier mini greenhouse for a balcony or patio costs far less, usually $30–$80.

Is it cheaper to buy a greenhouse kit or build one from scratch?

A kit is almost always cheaper and faster for anything under about 200 square feet. A pre-fab walk-in kit bundles the frame, glazing, and hardware at a fixed price, while a from-scratch build adds foundation work, custom framing, and glazing purchased separately — costs that push the per-square-foot price toward the $25–$35 range Angi reports for A-frame builds, versus roughly $10–$20 per square foot for a comparable kit.

What's the biggest hidden cost people forget when budgeting for a greenhouse?

Foundation and site prep. A greenhouse kit's sticker price almost never includes a gravel pad, poured footings, or a level base, but skipping that step is the single most common reason kits fail early — wind lift on an unanchored soft-cover greenhouse or frost heave under polycarbonate panels. Budget an extra 10–20% of the kit price for a proper foundation, plus heating and electrical if you plan to grow through winter.

Does a bigger greenhouse cost proportionally more?

No — per Angi's 2026 cost data, doubling a greenhouse's footprint nearly doubles the total price, but the cost per square foot actually drops as size increases, since fixed costs like doors, vents, and a single heating or irrigation setup get spread across more floor space. That's why serious growers often size up once rather than buying a small kit and upgrading later.

How Much Does a Greenhouse Cost? (2026 Price Guide)

Quick Answer: A backyard greenhouse costs anywhere from $30 for a tabletop mini kit to $16,000+ for a professionally built structure, with most DIY walk-in kits landing between $200 and $3,100. Per square foot, expect $10–$35 for a kit-built structure, according to Angi’s 2026 cost data, with hoop-style tunnels at the cheap end ($5–$10/sq ft) and framed A-frame builds at the expensive end ($25–$35/sq ft). The number that matters most for budgeting isn’t the kit price — it’s the foundation, heating, and electrical work most buyers forget to add on top.

Greenhouse cost questions almost always start with the wrong number. A shopper sees a $200 walk-in kit online and assumes that’s the whole project, then gets surprised by a gravel pad, an anchoring kit, and a heater once winter hits. Below is what a greenhouse actually costs at every size, plus the add-on costs that turn a $200 kit into a $500 project.

Greenhouse cost by the numbers:

$10–$35 per square foot — the typical kit-built range per Angi’s 2026 data, with most homeowners paying an average of $25/sq ft per HomeAdvisor’s 2026 update.
$3,071–$16,209 — Angi’s reported total-project range for a built greenhouse, with an average project cost of $9,640.
$5–$10 per square foot for hoop-style tunnel greenhouses (the cheapest structural type) versus $25–$35 per square foot for framed A-frame builds, per Angi.
10–20% of kit price — a reasonable rule-of-thumb add-on for a proper gravel or poured foundation, which most kit prices don’t include.

Greenhouse cost by type and size

Type / size	Typical price	Best for
Tabletop / 4-tier mini	$30–$80	Balcony, patio, seed-starting only
Soft-cover walk-in (Quictent, Outsunny)	$110–$340	Budget season extension, renters
Polycarbonate kit, 6x8 (Palram Harmony)	$744–$829	Durable hobby greenhouse, 3+ seasons
Steel-frame walk-in, 12x20 (ShelterLogic GrowIT)	$598–$708	Larger hobby footprint, budget frame
Premium polycarbonate, 8x12+ (Palram Glory)	$3,100–$5,200+	Winter growing, hail resistance
Custom site-built (hoop to A-frame)	$3,071–$16,209	Permanent structure, largest footprint

1. Mini and tabletop kits: $30–$80

The cheapest way into greenhouse growing is a 4-tier mini kit — a few wire shelves wrapped in a clear PE cover, sized for a balcony, patio, or apartment. These hold seed trays and small pots, not full-size plants, and won’t survive a real storm without anchoring, but at $30–$80 they’re the lowest-risk way to test whether season extension is worth it before committing to a walk-in structure. See our best mini greenhouse picks for specific models.

2. Soft-cover walk-in kits: $110–$340

Walk-In Greenhouse Kit (PE Cover)

Steel-tube frame · zippered PE cover · roll-up sides

Quictent and Outsunny walk-ins typically run $110–$340 depending on size (most sit in the 6x8 to 10x20 range).
No foundation required out of the box, but the fabric cover is the first thing to fail — budget for a repair-tape kit or a cover replacement within 2–4 seasons.
Needs ground anchors or stakes; wind lift is the #1 failure mode at this price point.

Check price on Amazon →

This is the entry point for most backyard growers who want real walk-in space without a big investment. The steel-tube frame and zippered PE cover assemble in an afternoon, and roll-up sides give you passive ventilation for free. The tradeoff is durability: the cover is UV-degraded plastic, not glazing, so plan on replacing or patching it every few seasons rather than treating it as a permanent structure. If you’re deciding between this tier and a hard-panel kit, our greenhouse vs cold frame guide breaks down when the smaller step-up makes more sense.

Before you buy, it’s worth reading up on foundation and anchoring specifics for your climate zone — Kindle Unlimited includes a wide library of greenhouse-building and season-extension guides you can browse free for a month while you’re still planning your budget tier. Sponsored link — we may earn a fee if you sign up. No extra cost to you.

3. Polycarbonate panel kits: $598–$5,200+

Hard-panel kits step up in both price and lifespan. A 6x8 Palram Canopia Harmony runs $744–$829 with twin-wall polycarbonate glazing that resists hail and holds heat far better than film — a real multi-year structure rather than a seasonal one. Steel-frame alternatives like the ShelterLogic GrowIT (12x20, $598–$708) trade some glazing quality for a bigger footprint at a similar price. At the top end, a premium build like the Palram Glory (8x12+) runs $3,100 on sale up to $5,200+ at full retail, aimed at year-round winter growing rather than seasonal extension. Full picks and sizes are in our best greenhouse kit and best small greenhouse roundups.

4. Custom site-built greenhouses: $3,071–$16,209

Once you move past pre-fab kits into a custom-built structure — poured foundation, custom framing, glass or polycarbonate glazing purchased separately — Angi’s 2026 data puts the total project between $3,071 and $16,209, averaging $9,640. Per square foot this breaks down by structural type: hoop-style tunnels are cheapest at $5–$10/sq ft, rooftop greenhouses run $10–$20/sq ft, and framed A-frame builds run $25–$35/sq ft. Doubling the footprint nearly doubles the total cost, but the per-square-foot price actually drops as size grows, since fixed costs like doors and vents spread across more floor space either way.

The hidden costs kit prices don’t include

Foundation: a gravel pad or poured footing isn’t included in most kit prices — budget an extra 10–20% of the kit cost, and see our greenhouse foundation guide for options by structure weight.
Heating: an electric heater for a small hobby greenhouse runs roughly $0.26/hour to operate at U.S. average electricity rates; propane costs more upfront but delivers more heat per dollar for larger or off-grid structures. Full picks in our best greenhouse heater roundup.
Electrical: running power to a greenhouse for heating, lighting, or irrigation timers often costs more than the structure itself if the greenhouse sits far from the house.
Anchoring: ground anchors or a poured perimeter to stop wind lift — cheap on their own, but a total loss if skipped and a storm takes the cover.

How to choose your budget tier

Testing the idea: start with a $30–$80 mini kit before committing to anything bigger.
Serious hobby growing: budget $600–$900 for a durable polycarbonate walk-in, plus 10–20% for foundation.
Winter growing or a permanent structure: expect $3,000+ either way, whether that’s a premium kit or a custom build — at that budget tier, per-square-foot cost matters less than glazing quality and insulation.
Always add foundation and heating to the sticker price before comparing two options — a cheaper kit with a costly retrofit foundation can end up pricier than a slightly more expensive kit that doesn’t need one.

The bottom line

Most backyard buyers land somewhere between a $110 soft-cover walk-in and an $829 polycarbonate kit, and the kit price is rarely the full story — foundation, anchoring, and heating typically add another 15–30% on top. If you’re growing through winter or want a structure that lasts more than a few seasons, budget for the $3,000+ tier from the start rather than upgrading twice. Start with our best greenhouse kit roundup to compare specific models at every price point above.