Greenhouse Cost Calculator — What Does a Greenhouse Cost in the UK? | ZonedGarden
🏡 FREE · INSTANT ESTIMATE · UK PRICES 2025

Greenhouse Cost Calculator — Free

Find out exactly what a greenhouse costs before you buy or build. Enter your size, choose your frame and glazing type, add any extras, and get a realistic total cost estimate — supply only, or fully installed. Based on current 2025 UK prices.

Compare Greenhouse Types
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Frame Types
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Glazing Options
10+
Extras Covered
Greenhouse Cost Calculator
Enter your greenhouse dimensions and choose your spec to get a cost estimate — structure only, or including base and installation.
Width (metres)
Length (metres)
Frame Material
Glazing Type
Base Type
Installation
Optional Extras
Heating System
Ventilation
Staging / Shelving
Guttering
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Budget Estimate
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Mid Estimate
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High Estimate
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✓ UK Prices 2025 — current market rates ✓ 5 Frame Types — all materials covered ✓ 4 Glazing Options — glass to polycarbonate ✓ Extras Included — heating, staging, base ✓ Free Forever — no account needed
HOW IT WORKS

How to Use the Greenhouse Cost Calculator — 3 Simple Steps

Get a realistic greenhouse cost estimate in under a minute. No contractor calls, no brochures, no obligation.

01
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Enter Your Dimensions

Enter the width and length of your planned greenhouse in metres. If you're not fixed on a size yet, use standard sizes — 6×8ft (1.8×2.4m), 8×10ft (2.4×3m), or 10×12ft (3×3.6m) are the most common sizes available in the UK and give realistic cost comparisons across brands.

Takes 30 seconds
02
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Choose Frame, Glazing & Base

Select your frame material (aluminium or timber), glazing type (glass or polycarbonate), and whether you need a new base built. These three choices have the biggest impact on total cost — frame and glazing choices can change your final figure by 40% or more for the same size greenhouse.

Takes 1 minute
03
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Add Extras & Get Your Estimate

Choose any extras you want — heating, staging, guttering, or auto ventilation — and select whether you're fitting it yourself or having it professionally installed. The calculator returns a budget, mid, and high estimate covering the full cost range for your specification.

Results in under 5 seconds
GREENHOUSE TYPES

Which Type of Greenhouse Is Right for You?

The best greenhouse for your garden depends on budget, available space, how you plan to use it, and how much time you want to spend on maintenance.

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Aluminium Frame Greenhouse
Most popular choice in the UK
Aluminium greenhouses are the default choice for most UK gardeners, and for good reason. They're lightweight, rust-proof, require virtually no maintenance, and the range of sizes available is enormous — from compact 6×4ft grow houses to full 12×20ft structures. Budget aluminium greenhouses are affordable and functional; premium models include features like roof vents, guttering, and toughened safety glass as standard. Lifespan is typically 20–30+ years with minimal upkeep.
£200 – £3,500+ supply only
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Timber Frame Greenhouse
Best for aesthetics and insulation
Timber greenhouses look significantly better than aluminium — they blend naturally into a garden setting and often become a visual feature in their own right. Cedar is the most popular choice, as it's naturally rot-resistant and needs only occasional oiling rather than painting. Timber frames also have better thermal properties than aluminium, which can reduce heating costs in winter. The main drawbacks are higher cost and more maintenance compared to aluminium — expect to treat or oil the wood every 2–3 years.
£800 – £8,000+ supply only
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Lean-To Greenhouse
Best for small gardens
A lean-to greenhouse (also called a wall greenhouse) is built against an existing house or garden wall, which means you only need three sides and a roof. This makes them cheaper to buy and install than a freestanding greenhouse of equivalent growing space. The wall also provides useful thermal mass — it absorbs heat during the day and releases it at night, which naturally extends the growing season. Ideal for narrow gardens where a full-width freestanding greenhouse isn't practical. Available in both aluminium and timber frames.
£300 – £4,000+ supply only
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Polycarbonate Greenhouse
Best for families & budget buyers
Polycarbonate-glazed greenhouses use twin or triple wall polycarbonate panels instead of glass. They're lighter, virtually unbreakable, and have better thermal insulation than single-layer glass — making them safer around children, more resilient to hail and accidental impacts, and slightly cheaper to heat. The trade-off is that polycarbonate diffuses light rather than letting it pass through clearly, and cheaper grades yellow and become opaque over 10–15 years. 10mm triple wall polycarbonate is a significantly better investment than cheap 4mm twin wall for any serious growing use.
£180 – £2,500+ supply only
UK GREENHOUSE PRICES 2025

How Much Does a Greenhouse Cost in the UK? — 2025 Price Guide

Current prices for the most common greenhouse sizes and types, based on UK supplier pricing. Installation and base costs are listed separately.

SizeTypeBudgetMid-RangePremiumNotes
6×4ft (1.8×1.2m)Aluminium + Horticultural Glass£180£280£420Entry level. No staging, basic vents.
6×8ft (1.8×2.4m)Aluminium + Toughened Glass£320£550£850Most popular size for home gardeners.
8×10ft (2.4×3m)Aluminium + Toughened Glass£500£850£1,400Good growing space; room for staging.
10×12ft (3×3.6m)Aluminium + Toughened Glass£750£1,300£2,200Popular with serious growers.
6×8ft (1.8×2.4m)Timber Cedar + Glass£800£1,400£2,800Aesthetic choice; higher maintenance.
10×12ft (3×3.6m)Timber Cedar + Glass£2,000£3,500£6,500Premium garden feature greenhouse.
Any sizeConcrete slab base (incl. labour)£40/m²£65/m²£95/m²Essential if no existing hard surface.
Any sizeProfessional installation£200£400£800+Flat-pack assembly by an experienced fitter.
Any sizeDwarf wall brick base£80/m£130/m£200/mPer perimeter metre. Improves insulation.
💡 Important note on greenhouse pricing
"Supply only" prices from UK greenhouse manufacturers cover the structure and glazing as a flat-pack kit. They do not include the base, installation labour, internal staging, heating, or site preparation. For a realistic total budget, add at least £400–800 for a basic concrete slab base on a typical 6×8ft greenhouse, plus £200–400 for professional assembly if you're not comfortable with a detailed flat-pack build.
GREENHOUSE EXTRAS

Optional Greenhouse Extras — Costs & What They're Worth

Not all extras are essential — but some make a significant difference to how useful your greenhouse actually is.

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Greenhouse Heating

An unheated greenhouse extends the growing season but won't protect tender plants from a hard frost. A small electric fan heater (1–2kW) is the most practical solution for most home greenhouses — safe, controllable, and easy to install.

£30 – £180 supply
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Auto Vent Openers

Temperature-activated vent openers open roof vents automatically when the greenhouse gets too warm and close when it cools. Surprisingly cheap for how much they improve growing conditions — and essential if you're not around during hot days.

£15 – £35 each
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Staging & Shelving

Aluminium or timber staging along one or both sides of the greenhouse dramatically increases the usable growing space. Most greenhouse kits offer matching staging as an add-on. Slatted staging allows airflow under pots, which reduces fungal issues compared to solid shelving.

£40 – £150 per section
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Guttering & Water Butt

A 240-litre water butt connected to greenhouse guttering can supply a surprising proportion of your watering needs. Adding guttering to an aluminium greenhouse is straightforward and most kits include a gutter connection option. Typically pays back in water costs within 1–2 seasons.

£25 – £80 kit + butt
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Shade Netting

Without shading, summer temperatures in an unventilated greenhouse can reach 40–50°C — enough to scorch plants and kill seedlings. Shade netting (50–70% density) or shading paint applied to the outside of the glazing brings temperatures down to manageable levels during peak summer.

£15 – £60
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Greenhouse Lighting

If you're planning to start seeds or overwinter tender plants through the darker months, adding a grow light extends your productive season significantly. LED horticultural grow lights have come down considerably in price and use a fraction of the electricity of older HPS systems.

£25 – £200 per light
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Automatic Irrigation

A drip irrigation timer connected to a water butt or tap means your greenhouse can water itself when you're away. Basic drip systems with a timer cost £30–80 and cover a typical home greenhouse. Particularly valuable for tomatoes and cucumbers, which need consistent moisture to avoid fruit issues like blossom end rot.

£30 – £120
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Bubble Wrap Insulation

Horticultural bubble wrap lining is one of the cheapest and most effective greenhouse investments. Fixed to the inside of the frame with clips, it reduces heat loss by 30–40% at a cost of £15–30 for a typical greenhouse. Far cheaper than increasing heating output — replace it every 3–5 years as UV exposure makes it brittle.

£15 – £40
MAKING THE RIGHT CHOICE

What Most People Get Wrong When Buying a Greenhouse

The most common greenhouse purchasing mistakes aren't about choosing the wrong brand — they're about the decisions made before buying.

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Buying Too Small

The single most consistent piece of advice from experienced greenhouse gardeners is to buy larger than you think you need. Every gardener who has had a greenhouse for more than a season or two wishes they had more space. Growing requirements expand rapidly once you start sowing seed in earnest — a greenhouse that seems ample in March is invariably full by May.

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Skipping the Base Preparation

A greenhouse put up on an uneven or soft surface won't sit true, the door won't open properly, and glazing bars will warp and let in draughts. A properly prepared concrete slab with a level, square perimeter is one of the best investments you can make in a greenhouse installation — and it's almost impossible to retrofit if you get it wrong first time.

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Underestimating the Need for Ventilation

Most budget greenhouse kits include a single roof vent as standard. In practice, adequate ventilation for hot UK summers requires roof vents covering at least 15–20% of the floor area. Adding auto vent openers and a second or third roof vent before you install the greenhouse is far easier and cheaper than retrofitting them later.

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Choosing Horticultural Glass Over Safety Glass

Horticultural glass is a standard greenhouse glazing that breaks into large, sharp shards when damaged. Toughened safety glass breaks into small, rounded pieces and is significantly safer — particularly important in gardens used by children, and increasingly required by household insurance policies. The price difference is modest; on any permanently installed greenhouse, toughened glass is the right choice.

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Choosing Timber Without Considering Maintenance

Timber greenhouses look beautiful when new. Without regular maintenance — oiling or treating every 2–3 years — they become grey, the wood degrades, and glazing bars become loose. If you're not going to maintain it properly, a quality aluminium greenhouse will outlast a neglected timber one and look better at year 10.

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Budget Polycarbonate False Economy

The cheapest polycarbonate greenhouses use 4mm single or thin twin wall panels that yellow and cloud within 5–7 years. Light transmission drops significantly as the material ages, limiting what you can grow. Spending more on a 6mm or 10mm triple wall polycarbonate greenhouse — or switching to glass — makes far more sense as a long-term investment than replacing a degraded budget structure every decade.

COMMON QUESTIONS

Greenhouse Cost — Frequently Asked Questions

Straightforward answers to the questions most people have before buying a greenhouse.

A basic aluminium greenhouse with horticultural glass starts at around £200–350 for a 6×4ft structure — supply only. For the most popular home gardener size (6×8ft or 8×10ft) with toughened safety glass, expect to pay £450–900 for the structure. Add a concrete base (£200–350 for this size) and professional installation (£200–400) and a fully installed 6×8ft greenhouse typically costs £850–1,650 in total. Premium timber greenhouses at the same size start at £900 and can reach £3,000+.
Most domestic greenhouses in the UK fall under permitted development rights and don't require planning permission, provided they meet certain conditions: the greenhouse must be in the rear or side garden (not front), no taller than 4 metres (2.5m for a flat-roof lean-to), not covering more than 50% of the garden area, and not built on protected land or a listed property. If in doubt, contact your local planning authority — it's a free check and avoids potential enforcement issues. Lean-to greenhouses attached to a house wall need to comply with the same rules that apply to extensions.
Yes — particularly for any greenhouse used in a garden where children play, or where the greenhouse is in a location exposed to wind, sports equipment, or other impact risks. Toughened glass is typically £40–80 more expensive than horticultural glass for a 6×8ft greenhouse, breaks into small rounded pieces rather than large sharp shards, and is increasingly required by household insurers for permanent garden structures. The cost difference is small relative to the safety benefit over a 20–30 year greenhouse lifespan.
Both have genuine advantages. Glass allows more light to pass through (around 90% vs 70–85% for polycarbonate), doesn't yellow or degrade with UV over time, and is easier to clean. Polycarbonate is unbreakable, has better thermal insulation, diffuses light (which actually benefits some plants by reducing scorch), and is safer around children. For a serious grower wanting maximum light for crops like tomatoes and cucumbers, toughened glass is usually preferable. For a family garden or a primarily overwinter use, good quality 10mm polycarbonate is a sensible choice.
Most aluminium greenhouse kits are designed for DIY installation — they come with instructions and typically require only basic tools. A standard 6×8ft or 8×10ft greenhouse takes two people roughly a full day to assemble and glaze on a prepared base. The base preparation is the most technically demanding part — it must be level, square, and accurately sized to match the greenhouse footprint. Professional installation (typically £200–400) makes sense if you're not confident in the base work or glazing, if it's a large structure, or if the site has access challenges.
The honest answer is: larger than you think. For a serious vegetable and seed growing hobby, a 6×8ft greenhouse fills up remarkably quickly in spring. If you have the space, an 8×10ft or 10×12ft greenhouse gives you room to grow tomatoes, peppers, and cucumbers alongside space for propagation trays and overwintering tender plants. As a rule of thumb, buy the largest greenhouse your site, budget, and planning rules allow — virtually no experienced greenhouse gardener has ever said they wish they had gone smaller.
WHO THIS IS FOR

Who Uses This Greenhouse Cost Calculator?

Anyone planning to buy or build a greenhouse and wanting a realistic cost estimate before speaking to suppliers.

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Home Gardeners

Planning your first greenhouse purchase and want to know what a realistic total budget looks like — structure, base, installation, and extras — before you start comparing suppliers and reading brochures.

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Homeowners Improving Their Garden

Adding a greenhouse as part of a wider garden improvement project and needing a realistic cost figure to include in the overall budget before anything is ordered or committed to.

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Property Developers

Estimating the cost of adding a greenhouse or garden room as a value-add feature to a property prior to sale — useful for quick budget checks without requesting formal quotes.

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Allotment Holders

Planning a greenhouse or polytunnel for an allotment plot and wanting to compare the cost of different sizes and materials against the growing benefit before deciding on a structure.