Due to the variety of aspects that concern photovoltaics, regulations and legal acts come from the fields of construction law, energy law, renewable energy sources law, anti-fire and anti-electric shock protection law ( Fig. 1 ). The chapter will discuss these issues.

On 19 September 2020, an amendment to the Construction Law came into force. The Act of 13 February 2020 on amending the Act - Construction Law and certain other acts [1].

According to art. 29. sec. 4 item. 3, a decision on a building permit is not required, nor is a notification of the execution of construction works involving the installation of heat pumps, free-standing solar collectors, photovoltaic devices with an installed electrical power of no more than 50 kW. A permit is required if additional circumstances occur, e.g. the installation is performed on an object entered in the register of historic monuments, belongs to a Natura 2000 area, or requires an environmental impact assessment [2], [3]. If, in connection with a photovoltaic installation, an extension to the building on which the installation is to be made is planned, a building permit is also required. This obligation rests with the investor and must be fulfilled before the construction work starts. Every investment (not only the photovoltaic one) must be in line with the zoning plan or the decision on outline planning and spatial development.

However, the legislation provides that in the case of installations with an installed electrical capacity exceeding 6,5 kW, there is an obligation to agree on the design of the photovoltaic installation with a fire protection expert with respect to its compliance with fire protection requirements and, at the same time, the obligation to notify the authorities of the State Fire Service (Article 56, paragraph 1 of the Act). It is not specified what scope of the project should be agreed with the expert. Nevertheless, the Photovoltaic Industry Association has prepared and outlined suggested good fire practices for installations in buildings, making connections with quick connectors, thermal imaging studies, protecting cables and wires from damage, appropriate tools, marking PV installations, servicing inspections and additional safeguards in terms of fire protection [4]. Fire protection is regulated by the Fire Protection Act of 24 August 1991 as amended [5].

The grid connection itself is regulated by Commission Regulation (EU) 2016/631 of 14 April 2016, laying down a network code on requirements for the connection of generating units to the grid [6], [7].