If I filed a mechanic’s lien four weeks ago with no response, can I proceed with a lien foreclosure now?
Yes. You have one year from the lien filing date. That said, it might serve your interests better to try a letter or phone call first. A foreclosure suit usually has more out of pocket costs than a 'normal' lawsuit because you have to perform a title search to identify any other parties who may have an interest in the property and pay to serve those additional parties.