Whether the architect works with the contractor directly depends on the type of construction project. Many owners actually include an in-between layer of "consultants / project managers" between contractor and owner so that the owner is free from daily chores of supervision and responding to frequent contractor inquiries on issues an owner is not qualified to answer.. Usually, no architectural drawings are 100% complete and often architects by contract are required to respond to contractor-initiated inquiries and clarifications even if the final drawings have been approved and passed by authorities. Issues that may arise include non-availability of material specified by the architect and faults found at construction stage. In large projects architects work until the handover of the completed project. In these projects, the architectural firm has an office at the construction site during the construction phase.
In small projects, like a social house, the architect is not involved after the drawings are approved and paid for. Contractor and owner may make small changes as required without the involvement of the architect.
Keep in mind that there is still design work being done during construction phase, such as interior finish or plumbing fixture selection, So the design phase is more overarching, but the drawings themselves get more detailed during the documentation phase and construction phase too
Bring dream home/projects in reality through all architectural knowlege ,applying full efforts, interacting with all concern parties-builder,contractor,site engineer,structural consultant over and above owner