(4) Če sta projektant in nadzornik ista pravna ali fizična oseba, projektant kot izvajalec ne sme izvajati gradnje na objektu, za katerega je izdelal projektno dokumentacijo. Kadar je projektant tudi izvajalec, morata biti projektant in nadzornik različna pravna oziroma fizična oseba, ki tudi ne smeta biti v nobeni medsebojni poslovni povezavi, odgovorni vodja projekta in odgovorni nadzornik pa tudi ne smeta biti v krvnem sorodstvu v ravni vrsti ali v zakonski zvezi ali živeti v izvenzakonski skupnosti.
If the same legal or natural person is the project designer and the supervisor, the project designer may not carry out any construction as a contractor on any works for which the project designer drew up the project documentation. If the project designer is also the contractor, the project designer and the supervisor must be different legal or natural persons, and the responsible project manager and the responsible supervisor may not hold any mutual commercial connection, be direct blood relatives or be married to each other or cohabiting with each other in a non-marital union.