In the UK, whether you need planning permission for a conservatory depends on various factors. Generally, conservatories are considered permitted development and don’t require planning permission if they meet certain conditions. Here are the key points to consider:

General Permitted Development Conditions for Conservatories:

1. Size and Scale:
   • The conservatory must not exceed 50% of the total area around the original house (as it was first built or stood on 1 July 1948 if it was built before that date).
   • It should not be higher than the highest part of the roof.
   • The maximum height should not exceed 4 meters.
   • If it is within 2 meters of the boundary, the eaves height should not exceed 3 meters.
2. Location:
   • Conservatories should not extend beyond the rear wall of the original house by more than 8 meters for detached houses or 6 meters for all other houses.
   • They should not be built forward of the principal elevation or side elevation fronting a highway.
3. Design:
   • Materials used in the exterior work should be similar in appearance to those of the existing house.
   • No balconies, verandas, or raised platforms are allowed.
4. Special Conditions:
   • If your property is in a designated area (e.g., a conservation area, National Park, Area of Outstanding Natural Beauty, or the Norfolk or Suffolk Broads), there might be additional restrictions.
   • Listed buildings require planning permission for any work, including conservatories.

Building Regulations:

• Even if your conservatory does not require planning permission, it will need to comply with building regulations. However, conservatories are usually exempt from building regulations if they meet specific criteria, such as:
  • The floor area is less than 30 square meters.
  • The conservatory is separated from the house by external quality walls, doors, or windows.
  • It has an independent heating system with separate temperature and on/off controls.
  • Glazing and electrical installations comply with the relevant building regulation requirements.

Steps to Confirm:

1. Check Local Authority Guidelines: Specific requirements can vary, so it’s essential to check with your local planning authority.
2. Consult a Professional: If you’re unsure, it can be beneficial to consult an architect or planning consultant.
3. Use the Planning Portal: The UK Government’s Planning Portal website provides comprehensive guidance and tools to help determine if you need planning permission.

Summary:

While many conservatories do not require planning permission, it’s crucial to ensure that your proposed structure complies with all the permitted development criteria and building regulations. Always check with your local planning authority to avoid any issues.