The Heights and Capitol Hill are pre-war housing
Houses from the 1920s and 1930s with their original service, fuse panel and knob-and-tube branch circuits are common on these streets, usually with two or three later additions wired on top in whatever was standard at the time. Separating those layers accounts for most of the labour.
Insurance requirements are often what starts the job
Insurers have tightened their position on knob-and-tube and fuse panels, and they ask for documentation rather than an assurance. A permitted job closed with a final inspection provides exactly that, which is why the paperwork matters as much as the work itself on these houses.
Infill and laneway houses need a supply of their own
A second dwelling behind the main house needs its own feeder and sub-panel, along with a decision about metering. On a narrow older lot with an existing 100A service, that decision generally comes at the same time as a service upgrade.