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Good afternoon, thank you for contacting just Answer my name is***** am a solicitor and I will be assisting you today. Building a porch onto your property is considered to be permitted development and therefore does not require planning permission, provided, that the ground floor area would not exceed three square metres.
Glad to be off assistance, the other considerations are the porch would not be more than three metres above ground level (this would be rare in practice as this would be more of a double story extension) and the porch would not be within two metres of any boundary of your property.
Yes it is likely that you will need planning as the porch will extend over one metre and thefore there will be less than two metres between the boundary and the porch.
Glad to be off assistance, sorry it is not better news, if anything remains unclear I will be happy to assist you further.