In the UK, when you're planning to fit a kitchen, it's often the case that planning permission is not required. However, it's crucial to consider building regulations approval. This becomes necessary if your project involves moving key fixtures like sinks, installing or modifying drainage systems for new appliances, or undertaking significant electrical work. Building a new kitchen or utility room, especially in a new location, or demolishing any walls also falls under this category, as these changes need to adhere to standards concerning ventilation, structural stability, and safety. On the other hand, if your kitchen project is limited to replacing existing fixtures or fittings on a like-for-like basis, such as kitchen doors or units, you generally do not need to worry about building regulations approval. As always, if you're uncertain, consulting with your local building control team is the best way to ensure your project complies with all necessary regulations.