In most cases, no, you don't need to seek planning permission to build a greenhouse.
However, there are some instances where you need to speak to your local council. For instance:
- If you are planning to erect the structure in a front garden.
- The maximum height is over 4m-tall for a pitched roof, 3m for other types of roof, or more than 2.5m within 2m of a boundary.
- Your house is listed.
- If you live in a national park.
Other rules may apply if your greenhouse is for commercial use, or on agricultural land.
If you are in any doubt, contact your local authority for guidance.