Roundups / Best greenhouses under £350

Grow-your-own · UK product comparison

Best greenhouses under £350 compared in 2026

A greenhouse gives your plants a more sheltered spot to grow, and you do not need a huge budget to get one. This roundup compares five options priced from £229 to £334. Two are compact units with lids, and three are walk-in models with doors. They differ a lot in size, glazing, ventilation and how long they take to put up. This page is based on desk research of the product details supplied, not hands-on testing.

P&P

Plot & Pot editors
We compare published product details, sizes and materials. These are desk-researched product roundups, not hands-on tests.

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Our stand-out pick

Palram-Canopia Mythos 6x4 Greenhouse, Silver

The Palram-Canopia Mythos 6x4 Greenhouse, Silver is our pick on paper. At £289 it is a walk-in model with a hinged door, an opening window, a roof vent, gutters and a galvanised steel base, all in a 185 x 126 cm footprint. It also has a 5-year defects and workmanship warranty. It costs £45 less than the 6x6 and includes a roof vent, gutters and a galvanised steel base. This choice comes from comparing the supplied details, not from testing.

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At a glance

Our picks compared

Prices are dated snapshots and can change. Product dimensions are shown as width × depth × height.

Product	Brand	Price snapshot	Retailer	Dimensions	Weight	Frame	Glazing	Shelves	Lids	Assembly	Warranty	Door	Ventilation	Extras	Lid	Floor
Rowlinson Hardwood Mini Greenhouse	Rowlinson	£229.00	One Garden	120 × 63 × 144 cm	30 kg	FSC hardwood	Twin-wall polycarbonate	2	2 lifting lids with adjustable stays	Self-assembly, 1 to 2 hours	12-month parts	—	—	—	—	—
Palram-Canopia Mythos 6x4 Greenhouse, Silver	Palram-Canopia	£289.00	One Garden	185 × 126 × 208 cm	26.5 kg	Rust-resistant aluminium	Twin-wall polycarbonate	—	—	Self-assembly, 2 people, 4 to 6 hours	5-year defects and workmanship	Hinged single door	1 opening window and 1 roof vent	Gutters and galvanised steel base	—	—
Palram-Canopia Mythos 6x8 Greenhouse, Silver	Palram-Canopia	£319.00	One Garden	185 × 247 × 208 cm	39.1 kg	Rust-resistant aluminium	Twin-wall polycarbonate	—	—	Self-assembly, 2 people, 4 to 6 hours	5-year defects and workmanship	Hinged door	1 opening window	—	—	—
Palram-Canopia Mythos 6x6 Greenhouse, Silver	Palram-Canopia	£334.00	One Garden	185 × 186 × 208 cm	34.1 kg	Rust-resistant aluminium	Twin-wall polycarbonate	—	—	Self-assembly, 2 people, 4 to 6 hours	5-year defects and workmanship	Hinged lockable door	1 roof vent	Gutters and galvanised steel base	—	—
Zest Compact Botanical Greenhouse	Zest	£329.00	One Garden	85 × 40 × 123 cm	40 kg	Pressure-treated softwood	Perspex	2 large removable shelves	—	Self-assembly	10-year anti-rot	—	—	—	Opening lid with stay	Not supplied

The details

Five greenhouses compared

01 · Best Compact Lid-Opening Greenhouse

Rowlinson Hardwood Mini Greenhouse

A small hardwood-framed unit with two shelves and two lids, suited to a patio or a sheltered corner.

The Rowlinson Hardwood Mini Greenhouse costs £229 and is built for small spaces rather than for standing inside. It has an FSC hardwood frame and twin-wall polycarbonate glazing, with two shelves for pots and trays. Two lifting lids have adjustable stays, so you can set how far each one opens. It stands 144 cm tall on a 120 x 63 cm footprint. Assembly is self-assembly and is listed at 1 to 2 hours, which is much quicker than the three Palram models. Annual treatment is recommended for the wood, and the warranty covers parts for 12 months.

Price snapshot: £229.00 at One Garden, recorded 2026-11-02. Check the retailer page for the current price.

Key specifications

Dimensions: 120 × 63 × 144 cm
Weight: 30 kg
Frame: FSC hardwood
Glazing: Twin-wall polycarbonate
Shelves: 2
Lids: 2 lifting lids with adjustable stays
Assembly: Self-assembly, 1 to 2 hours
Warranty: 12-month parts

What stands out

Quick to put together, with assembly listed at 1 to 2 hours
Two lifting lids with adjustable stays let you control the opening

Things to consider

Annual treatment is recommended for the hardwood frame
Only a 12-month parts warranty

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02 · Best All-Rounder

Palram-Canopia Mythos 6x4 Greenhouse, Silver

A compact walk-in aluminium greenhouse with a door, window, roof vent and steel base for £289.

The Palram-Canopia Mythos 6x4 Greenhouse, Silver costs £289 and is the most fully equipped option under £300 here. It has a rust-resistant aluminium frame and twin-wall polycarbonate glazing. A hinged single door gives you a way in, and an opening window and roof vent give you two ways to let air through. Gutters are included, and the galvanised steel base is part of the package. At 185 x 126 x 208 cm, it is big enough to walk into but smaller than the 6x6 and 6x8. It is the lightest Palram at 26.5 kg. Two people are needed for assembly, which is listed at 4 to 6 hours. A 5-year defects and workmanship warranty is included.

Price snapshot: £289.00 at One Garden, recorded 2026-11-02. Check the retailer page for the current price.

Key specifications

Dimensions: 185 × 126 × 208 cm
Weight: 26.5 kg
Frame: Rust-resistant aluminium
Glazing: Twin-wall polycarbonate
Door: Hinged single door
Ventilation: 1 opening window and 1 roof vent
Extras: Gutters and galvanised steel base
Assembly: Self-assembly, 2 people, 4 to 6 hours
Warranty: 5-year defects and workmanship

What stands out

Opening window and roof vent give two ways to ventilate
Galvanised steel base and gutters are included

Things to consider

Assembly needs two people and takes 4 to 6 hours

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03 · Best for Extra Floor Space

Palram-Canopia Mythos 6x8 Greenhouse, Silver

The longest walk-in model here, with 247 cm of length and a door and window, for £319.

The Palram-Canopia Mythos 6x8 Greenhouse, Silver costs £319 and offers the biggest footprint of the five at 185 x 247 cm. That extra length gives you more room for staging, trays or a longer run of plants. It has the same rust-resistant aluminium frame and twin-wall polycarbonate glazing as the other Mythos models. There is a hinged door and one opening window. The 6x4 and 6x6 also include a roof vent, gutters and a galvanised steel base, while this model gives you the extra floor length. It weighs 39.1 kg. Two people are needed for assembly, listed at 4 to 6 hours, and the 5-year defects and workmanship warranty applies.

Price snapshot: £319.00 at One Garden, recorded 2026-11-02. Check the retailer page for the current price.

Key specifications

Dimensions: 185 × 247 × 208 cm
Weight: 39.1 kg
Frame: Rust-resistant aluminium
Glazing: Twin-wall polycarbonate
Door: Hinged door
Ventilation: 1 opening window
Assembly: Self-assembly, 2 people, 4 to 6 hours
Warranty: 5-year defects and workmanship

What stands out

Largest footprint of the five at 185 x 247 cm
Only £30 more than the 6x4 for much more length

Things to consider

Heaviest of the Mythos models at 39.1 kg
Assembly needs two people and takes 4 to 6 hours

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04 · Best for Security and Airflow

Palram-Canopia Mythos 6x6 Greenhouse, Silver

A mid-sized walk-in greenhouse with a lockable door, roof vent, gutters and steel base, though it is the priciest here.

The Palram-Canopia Mythos 6x6 Greenhouse, Silver costs £334, the highest price in this roundup but still under £350. It sits between the 6x4 and 6x8 in size at 185 x 186 x 208 cm. The lockable hinged door is a useful distinction from the other greenhouse doors here. A roof vent handles ventilation, and gutters and a galvanised steel base are included. The frame is rust-resistant aluminium with twin-wall polycarbonate glazing. It weighs 34.1 kg. Two people are needed for assembly, listed at 4 to 6 hours, and the warranty covers defects and workmanship for 5 years.

Price snapshot: £334.00 at One Garden, recorded 2026-11-02. Check the retailer page for the current price.

Key specifications

Dimensions: 185 × 186 × 208 cm
Weight: 34.1 kg
Frame: Rust-resistant aluminium
Glazing: Twin-wall polycarbonate
Door: Hinged lockable door
Ventilation: 1 roof vent
Extras: Gutters and galvanised steel base
Assembly: Self-assembly, 2 people, 4 to 6 hours
Warranty: 5-year defects and workmanship

What stands out

Hinged door is lockable
Roof vent, gutters and galvanised steel base are included

Things to consider

Highest price of the five at £334
Ventilation comes from one roof vent

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05 · Best Slim Shelved Greenhouse

Zest Compact Botanical Greenhouse

A very slim wooden unit with two large removable shelves, but it does not come with a floor.

The Zest Compact Botanical Greenhouse costs £329 and is the narrowest option here at 85 x 40 cm, standing 123 cm tall. It is made from pressure-treated softwood with Perspex glazing. Two large removable shelves give you space for pots and seed trays, and the opening lid has a stay to hold it up. No floor is supplied, so it needs to sit on a suitable surface or base of your own. At 40 kg it is the heaviest product on this page, despite being the smallest. Assembly is self-assembly. A 10-year anti-rot warranty is included, which is the longest cover on the page for a wooden frame.

Price snapshot: £329.00 at One Garden, recorded 2026-11-02. Check the retailer page for the current price.

Key specifications

Dimensions: 85 × 40 × 123 cm
Weight: 40 kg
Frame: Pressure-treated softwood
Glazing: Perspex
Shelves: 2 large removable shelves
Lid: Opening lid with stay
Floor: Not supplied
Assembly: Self-assembly
Warranty: 10-year anti-rot

What stands out

Two large removable shelves are included
10-year anti-rot warranty is the longest cover here

Things to consider

No floor is supplied
£329 is a lot for the smallest footprint of the five

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