Copies of the report are given to both the manufacturer and the house owner. The system has been in operation for a number of years and several evaluations of the outcome have been carried out. The most pronounced effect that the system gives, according to the manufacturers, is the unique feedback from the production, building site etc. The number of errors has decreased and therefore the number of complaints from customers has also decreased. The work of the subcontractors can easily be controlled.
Some local authorities offer a lower building permit rate for P-marked houses.
Surprisingly enough, so far the P-mark has only been used to a limited extent in marketing. Manufacturers have no doubt increased their profitability due to lower quality costs, which is an incentive for joining the P-mark system. The indoor environment is very important in Sweden, and there are many factors in a house which affect the well-being of the inhabitants. According to the companies associated with the P-mark system, the scheme has helped to improve the quality of their products. This quality has also been retained at a high level.