When you need dependable legal guidance regarding complex construction law matters, our Philadelphia attorneys at Four Rivers Law Firm can help. (877) 637-7252 ; Bradley J. Vance.We have extensive experience helping construction law cases and navigating construction mistakes. Free consultations available. We represent clients throughout Philadelphia in all aspects of construction law, from negotiation and contract drafting to dispute resolution and litigation. As a Philadelphia construction lawyer, we've seen firsthand how proper contract drafting and negotiation can make or break a project. Contractors working in Philadelphia need to have a valid license and follow operational requirements. This page outlines the regulations related to contractors. You must get a Building Permit before starting a project that: Constructs a new building. Enlarges or adds to an existing structure.