The purpose of this article is to present and assess the impact of the regulation Art. 6471CC on subcontractors in the construction market and outline doubts in respect of the contents of the regulations. The first part of the article shows reasons why the regulation concerned was enforced – unfair practices in the construction services market which had a detrimental impact on subcontractors. Furthermore, selected doubts are presented, those associated with the contents of the regulation in question and raised by the doctrine and jurisdiction, for example, the legal nature of the investor’s consent or the investor’s joint and several responsibility. It is important to indicate the contrast between the unproblematic legislative process and doubts disclosed during its application. The author of this article also depicts two proposed modifications, which appeared in doctrine. The important issue for this article is also a description of the amended text of this regulation and comparison to the previous one. In conclusion, it should be emphasized that art. 6471 CC is really important for the polish legal system but both the previous content of this regulation and the present one aren’t sufficient to guarantee the lack of doubts in interpretation.