Choosing a site for your greenhouse
If you already have a level or nearly flat site it is an ideal place to position your greenhouse as it will be easier to achieve a good floor area for the foundations.The type of base you choose depends on your gardening needs. This guide should help youto choose what is best for you and give you some handy tips on how to achieve the perfect base for us to install your new greenhouse upon.
Please be aware that overhanging trees can damage a greenhouse and to reduce the risk it is recommended to avoid such an area. However if this is not possible do not worry as pruning provides a solution to the problem. Other considerations may be that the area you wish to site your greenhouse in is subject to Planning permission. Our guide below should help you to decide the best place for your greenhouse.
Greenhouses are generally regarded as temporary structures under planning rules. Planning permission is not required if your greenhouse meets the guidelines outlined below:
- The greenhouse must be single storey.
- The maximum allowed eaves height is 2.5m and maximum ridge height of 3m for a lean to structure or 4m for a freestanding greenhouse.
- If the greenhouse is within 2m of the boundary of your property, the maximum allowed height is 2.5m.
- The greenhouse must be sited so that it is not forward of the front elevation of your house.
- The area of the greenhouse must not cover more than half of the land around the original house, which is the house as it was in July 1948, or when it was originally built if your property is not as old as this. You may need to check the original house deeds to ensure that there have been no extensions by previous owners.
The rules for certain areas are more strict:
- In Areas of Outstanding National Beauty (AONBs), National Parks, World Heritage Sites and the Broads, Planning permission is required for all lean-to structures. All greenhouses sited 20m or more from your house in these areas are subject to a restriction on their area, which must not be more than 10 square metres.
- If your property is listed, Planning permission must be sought for all structures.
If you are not sure about any of this, then we recommend contacting your local authority, who should be able to advise you.
If you do need Planning permission, don’t worry. Our technical team are more than happy to help with drawings and specifications. Contact us on 01889 562610, or drop us an email with your requirements to firstname.lastname@example.org and we can work with you to ensure that your requirements are met.
Preperation of greenhouse bases
When preparing a foundation for one of our greenhouses, we recommend you use one of the following:
Bases for our round Octagonal and Decagonal buildings
Example concrete pad base for a round cedar greenhouse
A concrete or slabbed base can be built exactly to the sizes stated on the relevant greenhouse web page. For concrete pad and slabbed bases, we recommend allowing 50mm extra to the outside dimension of the greenhouse. This should be firm and flat, like the rectangular slabbed and concrete bases shown above. A concrete plinth which leaves the earth inside is also suitable: produce a concrete “ring” which is 10″ wide, with the external dimension being 2″ wider all the way around than the external greenhouse dimensions.
An example of an inadequate slab base. The loose slabs and uneven surface mean that we cannot secure the greenhouse down and there is the risk of the door being unable to lock because it is out of line. Also, uneven bases mean that the greenhouse is susceptible to leaks and movement, which can damage the timber. Our technical team are happy to advise you on base preparation, so if you are in doubt, please give us a call on 01889 562610.
Whether you choose a paving slab, concrete pad, existing old slabs, brick plinth or dwarf wall it needs to be firm, flat and to the correct size. Our technical team are here and more than happy to help with any advice you may need. To avoid dissatisfaction please BE AWARE that if our installation team are unable to perform the greenhouse installation and we need to return, due to the base failing to meet our requirements, regrettably a surcharge may be made.