Reshaping and building of porch

no you do not need to supply plans its a very basic job,if door or window need to be ordered i call the supplier and get them made before the build starts so when we have complicated the porch the door and window can be installed immediately

Adding a porch to any external door of your house is considered to be permitted development, not requiring an application for planning permission, provided: - The ground floor area (measured externally) would not exceed three square metres. - no part would be more than three metres above ground level (height needs to be measured in the same way as for a house extension). - no part of the porch would be within two metres of any boundary of the dwellinghouse and the highway. The permitted development allowances described described above does not apply to: - Flats and maisonettes, Converted houses or houses created through the permitted development rights to change use, Other buildings, Areas where there may be a planning condition, Article 4 Direction or other restriction that limits permitted development rights.

No planning requirements unless building is listed or in a conservation area. Look for a builder on his site with relevant experience and 100% feedback

The answer depends on the size and dimensions of new porch and whether it is in keeping with existing properties.