Wiring a Casita, Room Addition, Garage or Shop
An addition is a small building's worth of electrical — its own circuits, lighting and often a sub-panel. 4 Daughters Electric wires additions across Gilbert and the East Valley.
4 Daughters Electric wires home additions throughout Gilbert and the East Valley — casitas, room additions, converted garages, and detached shops. We plan the added load, run the feeder and often a sub-panel, and wire the circuits, lighting and devices to code, coordinating with your builder and the inspector. Call (480) 896-0325.
What an addition really adds electrically
A room addition or casita isn't just a few more outlets — it's often a self-contained space that needs its own lighting, receptacles, HVAC connection, and sometimes a kitchen or bath, all fed from a service that was never sized for it. A converted garage becomes conditioned living space with new requirements. A detached shop or casita may need a feeder run underground and its own sub-panel. The electrical scope scales with the addition, and it starts with one question: can the existing service carry the new load?
Why additions usually mean a sub-panel
When new living space sits some distance from the main panel — a detached casita, a backyard shop, a far-corner addition — running many individual circuits all the way back is impractical. Instead, we run a single properly sized feeder to a sub-panel located in the addition, and branch the local circuits from there. It's cleaner, it's how additions are normally powered, and it keeps the wiring organized for the future. The feeder and sub-panel have to be sized to the addition's total load, and the main service has to have the capacity to give it up — which is why the load calculation comes before anything gets pulled. Detached structures also bring grounding and, sometimes, trenching considerations that a simple room add doesn't.
Capacity check first
Before we wire an addition, we calculate its load and confirm the main service can feed it. If the existing panel is already near its limit, an upgrade may need to come first — better to know that at the planning stage than mid-build.
When it's simpler than you'd think
Not every addition needs a sub-panel. A modest attached room close to the panel, with a few outlets and lights and no heavy loads, may be served by extending existing circuits or adding one or two new circuits from the main. We right-size the approach to the addition — a small bump-out shouldn't be billed like a detached casita, and we won't scope it that way.
Our addition process
Load and layout
We calculate the addition's load, confirm main-service capacity, and plan circuits, lighting and any sub-panel.
Feeder and rough-in
We run the feeder (and trench for detached structures), set the sub-panel, and rough-in branch circuits.
Coordinate with the build
We sequence with your framer, HVAC and drywall so rough-in and trim land at the right times.
Permit, inspect, trim
Permitted and inspected, then devices, fixtures and covers installed and tested.
What helps at planning
- The addition type and size — attached room, converted garage, casita, or detached shop.
- What it will contain: kitchen, bath, HVAC, laundry, workshop tools.
- Distance from the main panel, and whether the structure is attached or detached.
- Your main panel's rating and available capacity.
Local detail: casitas and Gilbert lots
Casitas and detached shops are popular across the East Valley's larger lots — Queen Creek, San Tan Valley and parts of Gilbert like Higley Groves — where there's room to build. Those detached structures almost always mean a feeder and sub-panel, and often trenching across desert soil. Addition and sub-panel work is permitted through the Town of Gilbert Development Services building division (or the governing city), and we handle the electrical permit, coordinate the utility if the service changes, and see it through inspection.
Home addition electrical FAQs
Does my addition need its own sub-panel?
Detached structures and larger additions usually do — a single feeder to a sub-panel is cleaner than many long circuit runs. A small attached room close to the main panel often doesn't. The load and distance decide.
Can my current panel power an addition?
We calculate the addition's load and check your main service. If there's capacity, we feed it directly or via a sub-panel; if the service is maxed, an upgrade comes first. We flag that at planning, not mid-project.
Do you handle detached casitas and shops?
Yes, including the feeder, trenching where needed, grounding for the detached structure, and the sub-panel and branch circuits inside it.
Will you coordinate with my builder?
We work alongside your framer, HVAC and drywall crews, timing rough-in and trim to the build schedule and handling the electrical permit and inspections.
Is a garage conversion a big electrical job?
It can be — converting a garage to conditioned living space adds lighting, receptacle spacing, HVAC and often a bath, all to current code. We scope it to what the conversion actually requires.
Addition wiring across Gilbert and the East Valley
Reviews and directions: 4 Daughters Electric Google Business Profile.
Building out an addition or casita?
We'll calculate the load, confirm your service can carry it, and wire the space — feeder, sub-panel and all — in step with your builder.
Call (480) 896-0325Discuss an Addition