In the UK, fitting a kitchen usually doesn't entail obtaining planning permission, but it's important to be mindful of building regulations. These regulations are key when you're moving essential fixtures such as sinks, installing new drainage systems for appliances, or conducting major electrical installations. Similarly, if you're creating a new kitchen or utility room, or if your plans involve knocking down walls, these activities must comply with specific standards for ventilation, structural stability, and fire safety. For minor updates, like swapping out kitchen doors or units for similar items, building regulations typically don't apply. However, when in doubt, it's advisable to reach out to your local building control team to ensure your kitchen project is fully compliant.