How Much Does a Greenhouse Cost and Is It Worth It?

A small aluminium-framed greenhouse kit starts from around £300-£600 for a basic 6x8ft model, while a larger cedar-framed or bespoke greenhouse with a proper base and guttering can run to £2,000-£5,000+. Whether it's worth it depends less on the price tag and more on how seriously you'll actually use it — a greenhouse that gets used year-round for growing pays for itself in a way that one that becomes a glorified shed doesn't.

What affects the price

Frame material is the biggest factor: aluminium is the cheapest and lowest-maintenance option, timber (cedar being the common premium choice) costs more upfront and needs periodic treatment but looks better and lasts well if maintained. Size obviously scales cost roughly linearly once you're past the smallest kits, and glazing matters too — horticultural glass is cheaper than toughened safety glass, but safety glass is worth the extra cost anywhere children or pets have access, and some councils/insurers effectively require it near boundaries.

The base is often the forgotten cost. A greenhouse needs a level, solid base — usually a concrete slab or paving slabs on a compacted hardcore sub-base — and this can add anywhere from £200 for a small DIY base to £800+ for a professionally laid one on a larger greenhouse. Skipping a proper base to save money is a false economy: an unlevel greenhouse frame twists, and glazing panels can crack or fall out.

Ongoing costs to factor in

• Heating if you want to grow through winter — electric greenhouse heaters or heated propagators add to running costs, though many hobby growers manage with an unheated greenhouse and just accept a shorter growing season.
• Staging and irrigation — shelving/benching and a simple watering system aren't essential but make a greenhouse much more usable, typically £100-£300 extra.
• Maintenance — timber frames need re-treating every few years; aluminium frames need very little beyond occasional cleaning of the glazing.

Is it worth it?

If you already grow vegetables or flowers from seed, or want to extend the UK's fairly short outdoor growing season, a greenhouse genuinely earns its keep — starting seedlings under glass in early spring rather than waiting for reliable outdoor conditions can add a month or more of growing time each year. If gardening is more occasional, a cold frame or a few large pots with cloches achieve some of the same benefit for a fraction of the cost, and are worth trying first before committing to a full greenhouse.

Common mistakes

• Buying too small. Most first-time greenhouse owners outgrow a small 6x4ft model within a season or two — if space and budget allow, an 8x6ft or larger gives real room to work.
• Poor siting. A greenhouse needs a reasonably sunny, sheltered spot — one sited in permanent shade from a house or trees will underperform regardless of how much you spend on it.
• No ventilation plan. Automatic vent openers are inexpensive and prevent a greenhouse overheating on hot days when nobody's home to open windows manually — a real and common failure mode for unattended greenhouses.

If you're planning wider garden works alongside a greenhouse, it's worth thinking about siting and base groundwork as part of the same project — see our overview of garden landscaping costs for how a greenhouse base fits into a bigger plan, and our garden room cost guide if you're weighing a greenhouse against a more general-purpose outbuilding.

Second-hand and self-build options

A second-hand greenhouse (often sold when someone moves house or upgrades) can be a genuine bargain, sometimes a fraction of new-kit prices, but factor in the cost and labour of dismantling, transporting and reassembling it — and check the frame and glazing carefully for damage or corrosion before committing, since a badly weathered aluminium frame or cracked panes can turn a "free" greenhouse into an expensive repair job. A small number of confident DIYers build bespoke timber-framed greenhouses from scratch, which can offer better value than premium kit brands for an equivalent size, but this is a substantial carpentry project and only worth considering if you're already comfortable with structural timber work.

Choosing a location

Beyond sunlight, think about proximity to a water source (carrying watering cans a long distance gets old fast) and, if you plan to heat it, proximity to a power supply, since running an armoured electrical cable a long distance across a garden adds real cost. Avoid siting a greenhouse where it will be shaded by a building or hedge for a significant part of the day, and consider prevailing wind direction if you're in an exposed location — wind loading affects glazing and can increase heat loss substantially in an unheated or lightly heated greenhouse.