Wiss, Janney, Elstner Associates, Inc.

Philadelphia's engineering services page lists 49 businesses, and most give you a fast way in: 48 have a phone number on file and 44 link to a website. That means calling ahead or checking a site works for nearly every entry, whether you're near 19103, where 12 of these firms cluster, or scattered across 19102, 19106, and 19107.

None of these listings are marked verified. Paid placements are labeled Sponsored, and none of them carry that tag on this Philadelphia page right now, so the order you're scrolling is plain directory sequence, not a curated pick. If you own one of these firms and notice a phone or website field sitting blank, you can claim the listing and add the missing details yourself. Use the phone and website info to compare a few firms, call two or three, and ask about your specific project before committing to anyone.