A new law has been passed which from the 8th May 2021 makes it illegal to sleep in a motorhome overnight outside designated motorhome areas like campsites or camper parks.
It always used to be that you could park anywhere that any other vehicle could park quite legally and it didn't matter if anyone slept in the vehicle overnight.
There were various differences between 'parking' and 'camping' - steps out, chairs out etc But from the 8th of May just parking overnight with the intention of sleeping will be considered camping and will be illegal.
The Valenician Decree has been challenged and its been pointed out that motorhomes are vehicles in their own right so are not to be governed by the tourist authority but by 'traffic regulations'.
Meaning that if parked legally its all good wherever that is
Extract from the Spanish info from ASEICAR, the employers' association of the caravaning sector in Spain
'We understand that the definition of motorhome itself, being a vehicle, cannot under any circumstances fall within this prohibition (as it is governed by traffic regulations) and in this sense, our association has urgently addressed the different people responsible for Tourism of the Generalitat Valenciana in order to clarify this discrepancy that could seriously harm the sector.'
'Once the meeting between ASEICAR and the regional body has concluded, the General Directorate of Tourism of the Generalitat Valenciana has issued the following statement : « In relation to the doubts that are being raised regarding what is stated in article 2, section 5 of Decree 10 / 2021, of January 22 , of the Consell, by which the Regulatory Regulation of tourist accommodation of the Valencian Community is approved , it is reported that paragraph 5 of article 2 of the aforementioned Decree excludes from the application of this parking with or without overnight intention of motorhomes, since it does not prohibit or regulate theparking of these vehicles since this issue is not the responsibility of the tourist administration.'