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Greenhouse Buying Guide

Greenhouse Buying Guide

How to find the best greenhouse for your needs by understanding types, materials, operation and accessories.

Where to site a greenhouse?

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Choice of frames, shapes and size

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Types of glazing for a greenhouse

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Learn more about greenhouses

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Our best-selling greenhouses

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Where to site a greenhouse?

Where to site a greenhouse?

The first thing to decide upon is where you are going to position your greenhouse, as this will often determine what size you can accommodate. Don’t forget to allow enough room to access the sides of the structure for cleaning and maintenance.

  • The ideal position would have no shade, so be aware of any shadows cast by trees or buildings.
  • A greenhouse running north to south offers maximum summer light, whereas, east to west offers marginally more winter light.
  • If you intend to use electric heaters or lighting, then bear in mind the access to power.
  • Ideally, a greenhouse should be situated in a sheltered spot, which offers protection from the prevailing wind. Choosing a flat area will make laying a base simpler.

Having identified the most appropriate location in your garden, you can now measure up and decide what size greenhouse you want.

Different frame options

Aluminium

Aluminium


Advantages

  • Lower cost
  • Low maintenance
  • Easy self-assembly

Disadvantages

  • Limited colour choices
  • Not as strong or robust as timber in high winds or heavy snow
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Timber

Timber


Advantages

  • Strong and sturdy
  • Tends to be better at maintaining a steady temperature

Disadvantages

  • Higher cost
  • Will require maintenance from time to time
  • Softwoods will need treating, but may still rot over time
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Shapes

Apex greenhouses

The traditional apex shape greenhouse is a staple in the Great British garden. Giving plenty of room inside, apex greenhouses fit nicely in all gardens.

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Curved apex greenhouses

The traditional apex shape greenhouse is a staple in the Great British garden. Giving plenty of room inside, apex greenhouses fit nicely in all gardens.

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Lean-to greenhouses

Ideal for those with little space, a lean-to greenhouse, sometimes called pent, can back onto a wall or fence.

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Hexagonal design

If you want to make a statement with your greenhouse, a hexagonal option is a great choice. Make a garden feature out of your greenhouse.

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Size

Size
  • The taller the eaves, the better the light distribution is, so aim for a height of at least 1.5m.
  • Be sure to allow enough headroom so you can stand and move around comfortably.
  • A width of 6 feet or greater will allow for staging or beds on both sides of the greenhouse.
  • It’s best to go for the biggest size you can accommodate and afford.
  • Double sliding doors are both space saving and very practical for moving large plants in and out of the greenhouse.

Types of glazing for a greenhouse

Horticultural glass

Horticultural glass


Advantages

  • Better for light than plastic alternatives
  • Easily replaced if damaged

Disadvantages

  • Most easily damaged type of glazing
  • Shatters into large, sharp pieces so dangerous if broken
Toughened Glass

Toughened Glass


Advantages

  • Better for light than plastic alternatives
  • Stronger than horticultural glass
  • Toughened glass is more robust and shatters into smaller pieces when damaged, therefore making it safer around children and pets

Disadvantages

  • Higher cost
Polycarbonate panels

Polycarbonate panels


Advantages

  • Virtually indestructible
  • Better insulation than glass so can save on heating costs
  • Lower cost than glass

Disadvantages

  • Higher cost

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Heat and light

Heat and light


Good ventilation is essential for regulating temperatures, encouraging healthy plant growth and helping to combat pests and disease.

  • The most effective form of ventilation is roof vents, ideally on both sides of the roof. Louvred side vents can be useful too
  • Plants can easily be scorched by direct sunlight, so to reduce the intensity of the sun you can introduce shading. External or internal blinds, shading netting which is a convenient and low-cost choice
  • Tender plants will require a heat source as they need to be kept at a minimum temperature of 7°C all year round
  • Gas and oil heaters are very portable and cost-effective, they do require regular ventilation. Electric heaters are the best and safest solution
Assembly

Assembly


Most greenhouses are supplied for self-build, although the price of some timber models does include professional assembly.

  • Ensure that the greenhouse is securely anchored to whatever foundation or surface it's positioned on
  • Palram offer an anchoring kit for its range of greenhouses that can withstand winds of up to 100mph
  • Aluminium greenhouses are generally supplied with a base, usually around 5”/12.5cm high, but not all timber frame models are, so check before you buy

Foundation


Most greenhouses sit on concrete, paving slabs or gravel over a base of hardcore and sand, which provides good drainage and is particularly suitable if you intend to grow plants in containers or gro-bags. However, if you intend to grow crops in your greenhouse, it can sit directly onto soil.

Planning permission

Planning permission


Unless you live in a listed property or a designated area of outstanding beauty, it’s unlikely you’ll need to seek planning permission as long as the following apply:

  • The greenhouse is for your domestic use only
  • Along with any other outbuildings, the greenhouse covers less than 50% of your property’s land
  • It is less than 4m in height
  • If within 2m of the property’s boundary, the height of the eaves can’t exceed 2.5m
  • The greenhouse is not nearer to a public highway than the original house

These are not definitive guidelines, so it’s best to check with your local planning authority if you have any concerns.

Maintenance

Maintenance


Like most things, greenhouses need maintenance. It is important to check on your greenhouse on a regular basis to ensure that it is providing the right conditions for your plants to flourish.

  • Aluminium frames will need little ongoing maintenance, other than cleaning with detergent or a damp cloth from time to time
  • Timber frames will need regular application of stain or oil as required
  • Guttering should be cleaned, checked and any debris should be removed when necessary
  • Glazing should regularly be cleaned, both inside and out
  • Internal surfaces should be cleaned annually with a disinfectant to help protect plants from disease and pests

Greenhouse accessories


Everything you need to complete your growing experience. Make your greenhouse the best gardening enivronment with right accessories.

  • A wide variety of shelving, known as staging, is available to maximise the growing space for any greenhouse
  • A potting bench is a useful addition, especially if you intend to grow plants from seed
  • A greenhouse can require a lot of water during the warmer months, so it's a good idea to install a rain collection kit and a water butt

Our best-selling greenhouses

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