2607-0002 - AUTOPLAN

Single-storey extension Larger Home Extension prior approval assessed

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Beyond the standard permitted development depth this becomes a Larger Home Extension prior approval - up to 6m on an attached house or 8m detached. It runs a neighbour consultation scheme, which is 42 days before you can start.

GPDO 2015 Sch.2 Part 1 Class A.4

Shared walls mean a Party Wall Act notice: two months minimum before work can start. It constrains the programme, not the design, but it is the constraint that most often delays a start on site.

Party Wall etc. Act 1996 s.3, s.6