Yes, it's contrary to planning law to demolish an unlisted building in a conservation area.   But no council would surely order that it be rebuilt?  And certainly no inspector would ever uphold such a requirement on appeal?  Well the Carlton Tavern in Kilburn turns such conventional wisdom on its head - yes they would, in response to both questions.    This really sets a precedent for any rogue developer carrying out a risk analysis of going ahead with demolition, regardless:  the risk is that you may be required to rebuild the building brick by brick, tile by tile.  When lockdown ends I look forward to visiting this new planning 'cause célèbre' and toasting its reconstruction with a nice pint of beer.