Greenhouse Cost Calculator
A typical 6x8 aluminium greenhouse costs £500–£1,500, the base it must have £300–£800, and assembly £150–£400 — so £950–£2,700 standing and glazed. Like sheds, the base is the part that decides how long the rest lasts.
Open the calculator →Price greenhouse in 30 seconds
3 steps, using the figures from our cost guide.
How this calculator works
Every figure in this calculator is the one published in the cost table on our greenhouse guide. Pick the option that matches your job and the calculator returns that published range, adjusted for your region - it does not model anything the guide does not already say.
That is deliberate. A calculator whose rates drift from the page it sits under is worse than no calculator, because two numbers on the same site disagree.
What it cannot know: access, the condition of what is already there, and anything structural. Those are what separate three real quotes from each other.
Published greenhouse costs (2026)
| Option | Typical 2026 cost | Notes |
|---|---|---|
| Compact 6x4, built | £650–£1,300 | |
| Standard 6x8, built | £950–£2,700 | |
| Large 8x10 / 8x12, built | £1,800–£4,500 | |
| Slab or concrete base only | £300–£800 |
These are the figures from our greenhouse cost guide.
The ground under it decides the rest
The calculator adds the base and assembly to the frame, because those are the parts people forget and the base is what keeps the glass intact. What it cannot see is your ground — a sloping or soft plot needs levelling first, which adds groundwork to the figure. Orientation costs nothing but matters: an east-west ridge catches the most winter light, which is the whole point of a glasshouse.
If you are weighing a shed instead for storage rather than growing, the garden shed guide compares on cost, and general planting and upkeep help sits with the gardener guide.
Greenhouse calculator — FAQs
A standard 6x8 aluminium greenhouse lands at £950–£2,700 including the base and assembly - the frame is £500–£1,500 of that, groundwork and building the rest.
Yes - level and square, in slabs or concrete, costing £300–£800. Frames anchored to earth twist out of square and start cracking their own glass.
Rarely - the same permitted development rules as sheds: single storey, height limits near boundaries, and no more than half the garden covered by outbuildings in total.
It is safer and insulates slightly better; it also yellows, scratches and blows out of frames in storms. Toughened glass is the durable middle ground for family gardens.
Related cost guides
- Greenhouse cost guide — The full price guide
- All gardening services — Browse the hub
- All BestBuilders services — Every trade we cover
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