As long as you stick to these guidelines...
You do not need planning permission for a porch on a house, providing:
• The ground floor area, when measured externally, would not exceed three square metres.
• No part would be more than three metres above ground level.
• No part of the porch would be within two metres of any boundary of the dwelling house and the highway.
'If you take the front door of the property out the porch then becomes part of the property and is subject to building regulations and potentially planning permission,' say Compare the Market. 'Rules may be different for flats, maisonettes, other building types or houses created through the permitted development rights to change use.'