Capacity First, Then Circuits
Attic conversions often add new loads—HVAC zones, lighting layers, receptacles, maybe a compact sauna or towel warmer. Before you pull wire, run a load calculation on the main service to confirm headroom. If your main panel is crowded or undersized, a service upgrade (e.g., 100→200A) or a dedicated subpanel for the attic simplifies circuit routing and future maintenance. Place the subpanel in a code-compliant, accessible location (clear working space, labeled directory) and reserve spare spaces for growth.
Protection, Safety, and Convenience
Modern code typically calls for AFCI protection on most 120-V branch circuits in habitable areas and GFCI protection where water is present (bath, wet bar, near sinks). Combine dual-function breakers or listed devices as appropriate. Map receptacles to eliminate cord clutter in dormers and knee-wall alcoves; add tamper-resistant outlets and consider a few USB-C receptacles for charging niches. For lighting, specify high-CRI LEDs on dimmers, and use IC/AT-rated fixtures where insulation contacts the housing to protect the air barrier.
Low-Voltage, Data, and Future-Proofing
Pre-wire for data drops, access points, and ceiling speakers while walls are open; pull a spare conduit for tomorrow’s tech. Photograph the rough-in and label junction points behind knee-wall access doors. Keep penetrations airtight with gaskets or mastic, not just foam, so your electrical plan doesn’t sabotage your energy plan.
Inspections and Documentation
Expect rough electrical and final inspections. Provide fixture schedules, dimmer compatibility lists, and breaker legends that match actual circuits. Where you add heat (radiant mats, towel bars), assign dedicated circuits and list wattage on the drawings. For a planning worksheet that aligns loads, circuits, and protections, explore our NYC Attic Remodeling Service electrical upgrade guide.