What greenhouse size do I need?

Almost nobody regrets buying too much space. This page gives you the number in square feet, then the model that fits it.

Sungrow Greenhouse

Watch video to help you decide which greenhouse size is best for you.

3 Popular Greenhouse Sizes

Find the one that sounds like your season. The square footage includes walkways — it is the footprint you'd buy, not just bench area.

Compact backyard greenhouse beside raised beds

COMPACT SPACES

Up to 20 sq ft

Seed trays, hardening off, a few tomatoes in pots. One bench along a wall, standing room for one person.

See compact greenhouses →

Gardener with a basket of produce outside her greenhouse

MEDIUM SIZE

Up to 50 sq ft

Benches down both sides, a real walkway, room for tall crops at one end and a place to stand out of the rain.

See medium greenhouses →

Gardener harvesting from a greenhouse with in-ground beds

LARGER SIZES

Up to 100 sq ft

In-ground beds, a heater, a wheelbarrow that fits through the door. This is where the greenhouse stops being seasonal.

See larger greenhouses →

Need help to choose your greenhouse size?

River, our greenhouse specialist, will talk it through with you. Mon–Fri, 9am–5pm EST.

Call 1-877-669-1286

What are you planning to grow?

A standard garden bed is 2 ft deep. A comfortable walkway is 2.5–3 ft — narrower and you turn sideways every time you carry a tray.

A

Garden beds on one side only

2 ft bed + 3 ft walkway = 6 ft wide minimum

B

Garden beds on both sides

2 + 2 ft beds + 3 ft walkway = 8 ft wide minimum

C

Both sides + in-ground bed

add a 3 ft bed and a second walkway = 12–14 ft wide

D

Then pick the length

Length is the cheap dimension. Each extra 6.5 ft section adds ~52 sq ft on an 8 ft wide house — far cheaper per square foot than going wider later.

Inside a greenhouse: beds on both sides with a stone walkway

Rule of thumb: two trays of seedlings per running foot of bed. If you start 20 trays each spring, that's 10 ft of bed — one side of a 13 ft house, with the other side free for pots.

Compare Greenhouse Sizes

Every model extends in 6.5 ft sections, so treat width as the real decision.

Arch-shaped Sigma 2x4 (Gen III) greenhouse in a garden with flowers and a stone path by Planta Greenhouses EU.

Sigma Small Compact (Gen III)

Sungrow Compact (Gen III)

Sigma Medium Urban (Gen III)

Price

Sale~~$2,500~~

$2,400

Sale~~$2,650~~

$2,550

Sale~~$3,350~~

$3,150

Sale~~$3,450~~

$3,250

Sale~~$4,350~~

$4,050

Sale~~$5,500~~

$5,100

Sale~~$6,000~~

$5,500

Sale~~$11,250~~

$10,250

Sale~~$22,500~~

$21,000

Width

6.5ft

10ft

8ft

10ft

16ft

25ft

Length

6.5ft

13ft

19.5ft

26ft

32ft

27ft

26ft

Height

8ft

7.5ft

7ft

8ft

7ft

11.8ft

12.5ft

Sq ft

42sq ft

65sq ft

104sq ft

130sq ft

195sq ft

260sq ft

320sq ft

432sq ft

650sq ft

Details

View details →

Owner tending peppers inside her greenhouse

Speak With a Specialist

If you're not sure which greenhouse size is best for you, get in touch with River, our greenhouse specialist. She will help you review options and make an informed decision.

Call 1-877-669-1286

Available from Monday to Friday, 9am–5pm EST

Measure the site, not the greenhouse

01

Leave 2 ft of clearance on every side for assembly and panel replacement.
02

Check the door swing and path width — a 30 in. gate stops a wheelbarrow.
03

Confirm your local setback and permit threshold; many towns exempt structures under 120 sq ft.
04

Size the base for the largest house you might extend to, even if you buy short today.
05

Mark the footprint with stakes and live with it for a day before ordering.