Rewiring a single-family home is a scheduling problem. Rewiring an eight-unit apartment building, with eight sets of tenants, eight sets of work schedules, and a property manager who has to serve legal notice before anyone touches a wall, is a different job entirely. This post covers how a phased rewire actually runs in occupied San Jose and Bay Area buildings, what tenants experience, and what a property manager or owner should plan for.

The call usually comes from the carrier, not the wiring

Most occupied-building rewires I get called into start with a letter. The insurance carrier reviewed the property, found aluminum branch wiring or a Federal Pacific panel, and set a deadline. Sometimes it is a buyer's inspection during a portfolio sale. Occasionally it is a unit that had a real failure, a scorched outlet or a burning smell, and the owner decided not to wait for the second one.

What almost never happens is an owner deciding to rewire a full building because it seemed like a good idea. The work is disruptive and expensive, so it happens when something forces it.

That matters for scope. If a carrier letter is driving the project, the cheapest scope that satisfies the letter is usually the right scope. Read the letter before you quote the building.

The three patterns in Bay Area multi-family stock

Older San Jose apartment stock clusters into a few construction eras, and each one fails differently.

Aluminum branch wiring, 1965 to 1973. Common through Cambrian, Almaden, and the tract-built small apartment buildings from the same window. The conductor is not the problem. The connection points are, where aluminum lands on a device rated for copper. In a single-family home this gets fixed with COPALUM crimps, AlumiConn lugs, or full copper replacement. In a 10-unit building the same three options exist, but the multiplier changes the math: every device in every unit, times ten.

Federal Pacific and Zinsco panels. These show up constantly in small multi-family. Carriers have moved hard against both. Panel replacement is a separate scope from rewiring, but the two usually get bundled because the crew is already in the building and the tenant disruption is already scheduled. Details on that side of the work are on the multi-unit panel page.

Knob-and-tube in converted single-family. Plenty of Willow Glen and Naglee Park properties were cut into duplexes and triplexes decades ago, and the original pre-1950 wiring is still feeding parts of the building. The knob-and-tube rewire guide covers what carriers accept there.

Small commercial buildings follow their own pattern. Older retail and office space in San Jose tends to have decades of accumulated tenant improvement wiring layered on top of the original service, with circuits that no longer map to anything on the panel schedule.

Phasing: the part that decides whether the job works

A whole-house residential rewire runs five to ten days with the house empty or mostly empty. Neither condition applies in an occupied building, so the work gets broken into per-unit phases.

The sequence I run:

  1. Building walk and circuit mapping. Before anything gets quoted, the existing circuits get traced and documented. In buildings with layered tenant improvement work, this is the longest single step and the one most likely to change the scope.
  2. Phase plan with the property manager. Units get grouped into phases, usually two to four units at a time depending on crew size and building layout. Common-area circuits get their own phase.
  3. Notice served. California requires advance written notice to tenants before entry. The property manager handles service; the crew works to whatever date the notice sets. Plan on scheduling one to two weeks ahead so notice can go out cleanly.
  4. Per-unit rough-in and cutover. Each unit loses power for a defined window during its cutover. Tenants stay in the building; they lose the unit for part of a day.
  5. Rough-in inspection, then final. The AHJ inspects on the building's schedule, not yours. Build the inspection lag into the phase plan or the last phase stalls.

The failure mode on these jobs is almost never electrical. It is a notice that went out late, a tenant who was not home, or a phase plan that assumed every unit had the same layout.

What tenants actually experience

Worth setting expectations before the first notice goes out, because this is what generates the complaint calls:

  • Power off in their unit for a defined window on their phase day. Per-unit cutovers typically run four to six hours.
  • Crew access to walls, ceilings, and device boxes inside the unit.
  • Drywall patching at access points, with the patch-and-paint responsibility agreed with the owner or property manager before the job starts.
  • Common-area circuits handled separately, usually with shorter outages in hallways and laundry.
  • No disruption at all on the days their unit is not in the active phase.

Tenants tolerate this far better when the notice explains the window rather than just citing the legal minimum.

Realistic timelines

For a small apartment building, plan one to three weeks for the building depending on unit count and how much of the original wiring is being replaced. A two-to-four unit property with a partial scope can finish inside a week. A 12-unit building with full branch replacement and a meter bank rebuild runs longer, and the AHJ inspection cadence usually sets the outside limit.

Commercial spaces vary more. A single retail suite between tenants can be rewired fast because the space is empty. An occupied office running business hours means night and weekend work, which changes both the schedule and the price.

Who pays, and how it gets billed

Property managers and investors on the multi-property side run this on Net 30 or Net 60 terms rather than progress payments per unit. Portfolio owners who already have a retainer account get the phase scheduling folded into the existing relationship, which is most of the value of a property management retainer: the crew already knows the panels, the meter banks, and which units have the difficult access.

What to have ready before you call

The quote gets tighter and faster with these in hand:

  • The carrier letter, if one is driving the project
  • Unit count, and which units are occupied
  • The year the building was built, and any known remodel dates
  • Panel photos, including the meter bank
  • Whether the property manager or the owner is serving notice
  • Any prior electrical permits on the property

Monte Power & Electric is a licensed C-10 contractor, CSLB #1156675, carrying $2M in general liability on every job, working across San Jose, Santa Clara, Mountain View, Milpitas, Los Gatos, Morgan Hill, and the wider Bay Area including San Francisco, Oakland, and Palo Alto. If something in the building fails before the rewire is scheduled, emergency dispatch runs 24/7 with priority routing on property management accounts.

Frequently asked questions

  • Can you rewire an apartment building without moving tenants out?
    Yes. The work gets broken into per-unit phases so only the units in the active phase lose power, typically for a four to six hour cutover window. Tenants stay in the building throughout. Common-area circuits are handled as a separate phase with shorter outages.
  • How much notice do tenants need before electrical work?
    California requires advance written notice before entry, and the property manager or owner serves it. Practically, phase scheduling should be set one to two weeks ahead so notice can go out on time. Late notice is the single most common cause of a stalled phase.
  • Does the whole building have to be rewired, or can it be partial?
    Partial is common and often correct. If an insurance carrier is driving the project, the scope that satisfies the carrier letter is usually the right one. For aluminum branch wiring that may mean COPALUM crimps or AlumiConn lugs at every device rather than pulling new conductors through the whole building.
  • How long does a multi-unit rewire take?
    A small apartment building generally runs one to three weeks depending on unit count and scope. Per-unit cutovers are four to six hours. The AHJ inspection schedule, not the electrical work, usually sets the outside limit.
  • Do you work with property management companies on ongoing accounts?
    Yes. Property managers, HOAs, and multi-family operators run on Net 30 or Net 60 retainer accounts with one point of contact and one invoicing cadence across the portfolio, plus 24/7 emergency dispatch with priority routing.

Planning a rewire on an occupied property?

Send the building details and we'll walk the property, map the circuits, and put together a phase plan and quote. Get an estimate or call the dispatcher to talk through the scope.