Planning permission for 8kW commercial roof Northamptonshire

[calhalla]

We have the go ahead from a customer to install a 9 kW installation on a commercial building roof in Northamptonshire.
The installation will be on a flat roof and the building is currently unoccupied.
Will we need planning permission and if so how long does this normally take?
In other words can we beat the 12th December deadline?

 

[BruceB]

Yes. Not permitted development.
Preparation time plus 8 weeks decision time (might vary slightly by council)
Not unless you proceed without the formal permission in your pocket.

And I assume 3-phase so you are still G83/1-1 Stage 1

 

[calhalla]

Thank you for the reply BruceB, we have just had this confirmed by the Borough council responsible, including the 8 weeks decision time.
Proceeding without formal permission will be up to the building owner.

Yes to 3-phase and G83/1-1 Stage 1.