Multi-Family & ADU Electrical in Montavilla Portland: Meter Packs, Sub-Panels
Montavilla duplexes, triplexes, and ADUs require independent 100A meter packs, 2/0 service feeders, and sub-panels per Portland Bureau of Development Services (BDS) rules and NEC 230 for separate billing and load isolation.
Why Montavilla Multi-Family Electrical Must Be Independent
Portland BDS mandates ADUs have “completely independent electrical circuits” from main homes—no shared loads per Building Code Guide 00-10. Duplexes/4-6 plexes need multi-position meter packs for PGE individual billing. NEC 215.2 sizes feeders at 83% demand factor for continuous loads.
Montavilla ADU boom: 47% rental income increase per Portland maps data. Shared panels risk overloads, failed inspections.
Montavilla Multi-Family Load Requirements by Unit Type
|
Property Type |
Meter Pack |
Service Feeder |
Sub-Panel Size |
Montavilla Cost |
|
Duplex |
2-position 200A |
2/0 Cu (320A) |
100A per unit |
$8,500-$12K |
|
ADU (800sqft) |
Dedicated 100A |
3/0 Al from main |
100A main lug |
$6,200-$9,500 |
|
4-Plex |
4-position 400A |
350kcmil Cu |
125A per unit |
$18K-$25K |
|
Triplex |
3-position 300A |
4/0 Al |
100A per unit |
$14K-$20K |
PGE PowerPartner program required for multi-meter upgrades. Costs include BDS permits ($450-$1,200).
Signs Your Montavilla Multi-Family Needs Electrical Upgrade
- Single meter serving multiple units (illegal per BDS).
- Frequent breaker trips during peak tenant use.
- ADU permit denied for shared panel loads.
- PGE refuses separate billing setup.
Montavilla violation rate: 32% of pre-1980 duplexes per city records.​
Complete Montavilla Multi-Family Electrical Process (Step-by-Step)
- Load Calculation: NEC 220.82 demand factors—duplex averages 22kW total.
- PGE Service Request: Submit multi-meter application via PowerPartner portal.
- BDS Permitting: Electrical + structural permits ($450 base).
- Meter Pack Install: Milbank 200A multi-position on house side.
- Service Feeders: 2/0 Cu underground to building riser.
- Sub-Panels: Square D 100A per unit, separate neutrals/grounds (NEC 408.3.4).
- Rough-In/Trim: EV-ready conduit, GFCI kitchen/bath circuits.
- Inspection: BDS electrical inspector + PGE final connect.
Electric Avenue LLC coordinates all trades; 5-day average completion.
Montavilla-Specific Multi-Family Challenges & Solutions
- Narrow Lots: Stack meter packs vertically, side sub-panel garage mount.
- Historic Bungalows: Preserve exterior appearance, interior sub-panel attic.
- PGE Underground Rules: Conduit to 5ft depth for SE Stark St properties.
- ADU Separation: 250.52(A)(1) main house ground rod independent.
Result: Legal rentals, maximized income, zero overload risks.
Essential Components for Montavilla ADU/Multi-Family Power
- Multi-Position Meter Pack: Individual PGE billing per unit.
- Service Feeders: Sized per NEC Table 310.16 (75°C column).
- Sub-Panels: Main lug only, 42-circuit minimum per unit.
- Rough-In Features: 4#12 kitchen small appliance circuits, EVSE conduit.
- Rough-Trim Sequence: Conduit first, panel mount, circuit pull, device install.
Supports: Tankless heaters (45A), EV Level 2 (50A), separate tenant WiFi panels.
PGE Requirements for Montavilla Multi-Meter Service
- Minimum 200A total service for duplex/ADU combos.
- CT cabinet for 400A+ multi-family.
- Load test verification before final connection.
- No shared neutrals between units (NEC 215.4).
Average PGE hookup: 4 weeks post-inspection.
Electric Avenue LLC: Montavilla Multi-Family Electrical Experts
Family-owned Electric Avenue LLC specializes in Montavilla’s ADU/duplex electrical boom. Licensed master electricians manage BDS/PGE coordination, zero-defect inspections—from our family to yours.
Unlock rental income potential and pass Portland ADU inspections on first try with compliant multi-family electrical. Contact Electric Avenue LLC today for your FREE Montavilla load calculation, permit-ready plan, and binding installation quote that delivers scalable power for generations.