Sun Valley ADU Construction Placed Around the Main Panel
Sun Valley ADU construction on a cleared lot: the unit placed by where the new main panel stands, feeder and trench planned, LADBS permits and inspections.
The electrical panel that served a burned Sun Valley house may be gone along with its walls, leaving a meter pedestal or a temporary pole. Where the new main panel will stand matters to a backyard unit, because the unit's feeder starts there and runs underground to a subpanel inside it. A long feeder needs heavier wire and a longer trench, so we fix the panel location first and keep the unit within a sensible run of it.
Sizing the service and routing the feeder
A main panel serving a house and a backyard unit has to carry both, so the service is sized from a load calculation that counts the unit's cooktop, water heater, heat pump and any car charger. If the old service is being replaced after the fire, this is the moment to size the new one for both buildings. The feeder runs in conduit buried at the depth the electrical code sets, and it keeps clear of the sewer and gas routes. Where its trench would cross the future house site, it follows the edge of the lot.
LADBS inspections and the utility's say
LADBS permits the unit and inspects its wiring in stages: the trench with conduit in place before any soil goes back, the rough wiring while studs are bare, and the panels, breakers and devices at final. Smoke alarms are hardwired and interconnected during the rough stage. If the service is being replaced or the meter moved, the utility's planners decide where the new equipment may stand and how much clear space it needs in front, so we meet with them before the unit's footprint is locked. Their answer can move the unit a few feet.
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Moving in needs a live electric service, and the utility energizes a new service only after LADBS signs off on it. Building the unit first means that sign-off covers the new panel and the unit's feeder, while the breaker for the house stays off until its own inspections pass. Living there before the house is finished is a second approval, given by LADBS for your parcel.
Heat pump, water heater and any solar panels are listed on the energy forms for a Sun Valley unit, and those entries also set the load the feeder must carry, so we choose the equipment before the panel is sized. The package applies when the design stays on one level within 500 square feet and a visit to the parcel confirms the fit.
It may, and position helps: a garage near where the new main panel will stand needs only a short feeder. The structure decides the rest. We look at the slab for a footing, the studs for rot or termite damage and the roof framing for a ceiling's weight, and we pull a cover plate or two to see what wiring is there before it is replaced.
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