Yes, materially. A rough-in visit while walls are open costs less in labour than fishing the same cable through finished drywall later, because access is the expensive part of a retrofit. Most Vaughan home theatre projects still land between $4,500 and $25,000 installed regardless of stage, but stage decides where in that range you fall.
A media room upgrade with a 75-inch display, soundbar plus subwoofer, two in-wall surrounds, concealed wiring, and Sonos integration typically lands in the $4,500 to $8,500 range whether it's a rough-in or a light retrofit. A dedicated 7.1.4 Atmos theatre with projector, ALR screen, eight in-ceiling and in-wall speakers, AV receiver, equipment rack, and Control4 integration generally runs $14,000 to $25,000 installed; pre-wiring that scope before drywall trims labour but not equipment cost. Higher-end Kleinburg builds with anamorphic projection, riser construction, and Lutron lighting can exceed that range.
We quote every project after the site visit, once we know your actual stage, not from a package price. There are no surprise add-ons once drywall is already up and we've committed to a sequence.