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OutsunnyGreenhouses: Your essential buying guide
A mini greenhouse or compact lean-to greenhouse is often a practical choice for smaller gardens, patios and courtyards. Mini styles are useful for seedlings and a small number of plants, while lean-to designs can make good use of a wall or sheltered side return.
Choose a freestanding greenhouse if you have enough level space and want access from more than one side. A lean-to greenhouse is better suited to positioning against a wall, which can help save floor space and keep the structure close to the house or an existing outdoor tap.
Common options include glass and polycarbonate glazing. Glass offers a traditional look and clear visibility, while polycarbonate is lightweight and can be a practical option where impact resistance and easy handling are priorities. Always compare glazing thickness, fixing method and replacement availability.
Think about what you want to grow, how much staging you need and whether you require standing room. Allow space for pathways, pots, grow bags and opening vents or doors. If space allows, comparing the next size up can be worthwhile because growing space fills quickly.
Useful accessories can include staging, shelving, automatic vent openers, shading, irrigation kits, plant ties and replacement glazing clips. The right choices depend on the greenhouse style, the crops you grow and how much day-to-day maintenance you want to manage.
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A greenhouse should suit your garden layout, growing plans and the amount of maintenance you are happy to take on. Compare the main greenhouse types first, then look closely at size, glazing, ventilation and accessories before you decide.
Freestanding greenhouses are suited to gardens with a dedicated growing area and usually give you the widest choice of footprints. They can work well if you want a central space for tomatoes, cucumbers, seedlings, overwintering plants and general propagation.
Lean-to greenhouses are designed to sit against a wall, making them useful where floor space is limited or you want the greenhouse close to the house. Mini greenhouses are better for compact outdoor spaces, seasonal seed raising or protecting a smaller selection of plants.
Check the external dimensions as well as the internal growing area. A greenhouse needs enough room for staging, pots and movement, so consider whether you can comfortably reach plants at the back and open the door fully.
For narrow gardens, a slim lean-to or smaller freestanding model may be easier to position. If you plan to grow taller crops, compare ridge height, eaves height and door height rather than relying on floor size alone.
Greenhouse frames are commonly made from aluminium, wood or other garden-ready materials. Aluminium is often chosen for a low-maintenance look, while timber can suit more traditional garden schemes, but both should be compared for strength, finish and upkeep.
Glazing affects light, insulation, durability and appearance. Compare whether the greenhouse uses glass or polycarbonate panels, how they are secured, and whether replacement panels or fixings are easy to match.
Good airflow is important in a greenhouse, particularly during warm weather. Compare roof vents, side vents, louvres and door openings, and think about whether an automatic vent opener would make day-to-day temperature control easier.
Shading and watering accessories can help you manage plants more consistently. Staging, shelving, irrigation and shading options are worth comparing at the same time as the greenhouse, especially if you want a practical setup from the start.
For seed starting and young plants, prioritise staging, shelves and easy access. For crops such as tomatoes or cucumbers, look for enough headroom, ventilation and floor space for grow bags or large pots.
If you mainly want frost protection or seasonal storage for tender plants, a compact greenhouse may be enough. If you want to grow throughout more of the year, compare larger layouts and accessories that support temperature and moisture control.
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