This is a bit of a grey area and is, of course, subject to the fact and degree of each case. This is the advice provided on The Planning Portal:
You do not necessarily need planning permission to work from home. The key test is whether the overall character of the dwelling will change as a result of the business.
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If the answer to any of the following questions is 'yes', then permission will probably be needed:
- Will your home no longer be used mainly as a private residence?
- Will your business result in a marked rise in traffic or people calling?
- Will your business involve any activities unusual in a residential area?
- Will your business disturb your neighbours at unreasonable hours or create other forms of nuisance such as noise or smells?
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Whatever business you carry out from your home, whether it involves using part of it as a bed-sit or for 'bed and breakfast' accommodation, using a room as your personal office, providing a childminding service, for hairdressing, dressmaking or music teaching, or using buildings in the garden for repairing cars or storing goods connected with a business - the key test is: is it still mainly a home or has it become business premises?
In this situation, it’s recommended that you seek advice from a professional.