You can get a lot of valuable information about the project already at the first telephone contact. Here are the most important questions, summarised as a Checklist:
- Is the property owned or rented?
- If a rental: Is there a written consent from the property owner?
- Is it a detached, semi-detached, terraced or multifamily unit property?
- Cardinal point roof orientation?
- Roof area in square meters?
- How many square meters are not usable due to the presence of skylights or chimneys?
- Does the roof area planned for PV use partially lie in the shadow of trees or buildings?
- Is the building listed?
In most countries and regions, the installation of a PV roof system on a detached single family home does not require a permit. Whether or not a permit is required is defined by the pertinent national and regional building regulations.
It is advisable to consult the regional building regulations and/or to enquire at the pertinent Town Planning Office about obligations concerning displaying notices and/or obtaining permits.
Listed buildings fundamentally require approval from the pertinent Heritage Preservation Authority; guidelines and leeway for action can differ from one district to the next, so that it is recommended to obtain this information in all cases.