For those fitting a kitchen in the UK, it's generally not necessary to seek planning permission. However, attention to building regulations approval is important. This is particularly relevant when your renovation includes relocating important fixtures like sinks, adding or extending drainage for new appliances, or performing substantial electrical work. Constructing a new kitchen or utility room, or removing any walls, also requires adherence to standards regarding ventilation, structural integrity, and safety. In contrast, simpler upgrades like replacing kitchen doors or units with similar types don't typically fall under these regulations. It's a good idea, though, to contact your local building control team for guidance, ensuring your kitchen fitting meets all the required standards.