When building an orangery, you are usually not required to seek planning permission. It is classed as a permitted development, similar to a conservatory, and is subject to the same building regulations and guidelines. As long as you build within these rights, planning permission for an orangery is not necessary.
An orangery is a more affordable option compared to an extension, mostly due to the materials used. The overall cost per square metre of an orangery is generally cheaper than a single-story extension, depending on which style and design features you opt for.
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Posted in: Buying a Greenhouse