320A Service Upgrade
A 320 amp service upgrade is a high-capacity electrical project that often requires a new 320 amp meter base to support large home loads. This option is driven by detailed load calculations and utility requirements, rather than just the square footage of the property.
- One 200A service may not support the calculated load for your property.
- Multiple major electric systems like extensive HVAC or heat pumps are planned.
- The home will have multiple EV chargers or large pool equipment.
- A large addition, ADU, or detached structure adds substantial electrical demand.
- Multiple distribution panels are required to manage the electrical layout.
- A utility or engineering review indicates a higher-capacity service path is needed.
What a 320A Service Upgrade Can Include
A high-capacity electrical service project involves careful planning, utility coordination, and extensive equipment updates based on your home's unique layout.
Load Calculation & Assessment
Evaluating existing conditions, planned equipment, and diversity assumptions to determine the required electrical capacity.
Utility Coordination
Confirming service feasibility, utility infrastructure limits, and application requirements before equipment planning begins.
Meter Base Planning
Sourcing and coordinating the specific meter and service-entrance equipment required by your utility and panel arrangement.
Service Conductors & Grounding
Installing properly sized overhead or underground service entrance conductors alongside updated grounding and bonding systems.
Main Distribution Panels
Setting up one or more main electrical panels and feeders to safely distribute power throughout the entire property.
Permitting & Testing
Coordinating all local permits, managing inspections, and thoroughly testing the new distribution system before final labeling.
200 Amp vs 320 Amp Residential Electrical Service
Understanding the right service path depends on your calculated electrical loads, planned equipment, and utility guidelines.
200A Service Upgrade
Typical planning context
Standard home electrification
Common applications
Older service or moderate loads
Utility infrastructure
Often supported by existing lines
320A / 400A-Class Service
Typical planning context
High-capacity calculated loads
Common applications
Multiple EV chargers, ADUs, pools
Utility infrastructure
May require transformer review
Terminology varies by utility; some refer to these high-capacity configurations as 400A-class service.
A detailed load calculation is the only way to confirm which option your project requires.
How a 320A Service Upgrade Project Works
From initial load evaluation to final testing, here is how we manage high-capacity residential service projects.
- Collect Plans & InformationWe review your architectural plans, equipment load schedule, and existing service information to understand the project scope.
- Complete a Capacity AssessmentWe perform a detailed load calculation to confirm if a higher-capacity service is genuinely required for the planned demand.
- Confirm Utility FeasibilityWe coordinate with your local utility provider to verify service methods, infrastructure availability, and equipment rules.
- Design Panel & Meter ScopeBased on utility feedback, we design the layout for your new meter equipment, service conductors, and distribution panels.
- Manage Installation & PermitsOctopel coordinates permits, utility disconnects, and complete the installation of the new service equipment.
- Test and FinalizeWe complete circuit transfers, test the new distribution system, label the panels, and coordinate the final inspection.
When Might a Home Need a High-Capacity Service Upgrade?
A standard electrical service may not be enough when adding substantial new demands to your property.
Extensive home electrification
Transitioning to an all-electric home with large HVAC systems, multiple EV chargers, and extensive electric water heating equipment.
Extensive home electrification
Transitioning to an all-electric home with large HVAC systems, multiple EV chargers, and extensive electric water heating equipment.
Why Hire an Electrical Contractor for a High-Capacity Upgrade?
With over 1,000 residential repairs and 10+ years of experience, Octopel provides the detailed planning and utility coordination required for complex residential electrification projects.
Detailed Load Planning
We conduct comprehensive load calculations rather than guessing based on square footage, ensuring your design meets code requirements.
Utility & Permit Coordination
We navigate utility applications and local permit requirements, keeping complex multi-panel projects moving smoothly toward approval.
1,000+ Residential Repairs
Electrical troubleshooting and repairs completed in occupied homes.
Washington Electrical Contractor
Washington electrical contractor registration OCTOPEL770O1.
Safe Craftsmanship in Occupied Homes
We manage extensive feeder work and service modifications carefully, minimizing disruption while maintaining high safety standards.
What Affects the Scope of a 320A Service Upgrade?
Requirements vary by project and jurisdiction. Several structural and utility factors shape the final scope of a high-capacity residential service.
Utility infrastructure limits
Whether the local utility needs to upgrade the transformer or service point infrastructure to support the newly increased electrical demand.
Service route and civil work
The difference between overhead and underground service, including any required trenching, conduit installation, or exterior restoration.
Meter and panel configuration
The specific meter enclosure required by the utility and whether the home layout needs one or multiple main distribution panels.
Existing equipment conditions
The complexity of removing outdated gear, extending existing circuits, and updating grounding and bonding to align with current requirements where applicable.
Customer Reviews
Verified feedback from residential 320a service upgrade customers across the region.
Kasey Oleary
Residential customer
Octopel reconnected our new hot tub and ensured the electrical installation met current code requirements. The team handled the inspection process professionally, addressed all inspection requirements, and theRead full review →
Andy Kuljis
Residential customer
I have used Demeatri or Octopel, four times over the last five years, two 200 amp new service boxes, some underground work, rewiring a barn, and has cleaned up unsafe wiring on my farm. Always making time for my needsRead full review →
Rishi Pathak
Residential remodel customer
These guys are professional. They are very good at navigating through surprises during the project. They have good recommendations for folks who need some help with what they want to achieve. Dima is my go-to person forRead full review →
Angelina Dorosh
Residential remodel customer
Octopel has completed multiple electrical projects for us, from regular electrical service and troubleshooting to larger remodeling work. We have used them for repairs around the house as well as electrical work duringRead full review →
Beth Knight
Residential customer
Dimitri was exceptional! He repaired the entire electrical fixture that was taken down by a tree, in awful weather, and never complained! Cold and pouring rain! I would definitely use this company again!Read full review →
Gio Hwang
Residential customer
Octopel installed a new power pole and 200-amp electrical service for my manufactured home. The Octopel team was professional, communicated clearly, and completed the work efficiently. Everything has been working well,Read full review →
Hrach Voskanian
Residential customer
Reliable, fast, and most important good job. Highly recommendRead full review →
Adam Patterson
Residential remodel customer
Mid-remodel we realized a lot of our old wiring needed to be redone. Octopel came in as our remodel electrician and worked around the rest of the construction crew without any scheduling issues.Read full review →
Discuss a 320A Residential Service Upgrade
Submit your project details, architectural plans, and equipment load schedule. During business hours, a manager responds to submitted requests within one hour. On-site visit timing is scheduled based on the situation, location, and team availability.
320A Residential Service Upgrades in Western Washington State
Octopel plans and installs 320A high-capacity electrical service upgrades for residential properties throughout Western Washington State.
Availability and possible visit timing depend on the property location, reported problem, and team schedule.
Not sure whether your home is within the service area?
320A Service Upgrade FAQ
Common questions about planning and installing high-capacity residential electrical services.
A 320 amp service is a high-capacity electrical setup designed for homes with significant power demands.
It provides a 320A continuous rating and is typically used when a property has multiple distribution panels, extensive electric heating, or major detached structures.
Terminology and equipment descriptions vary by utility provider and region.
While some utilities treat them as overlapping 400A-class services based on peak versus continuous ratings, you must verify the exact equipment and service design with your local provider and project plans.
A 400A upgrade is a related high-capacity electrical configuration, but specific utility definitions determine if they consider it identical to a 320A layout.
You can read more about it on our 400A Service Upgrade page.
A 320 amp meter base is the exterior equipment enclosure that houses the utility meter for this specific capacity level.
The exact model and configuration must strictly align with your local utility's requirements and the planned panel arrangement inside the home.
A home needs a larger service when the calculated demand from planned equipment justifies higher capacity.
This often happens when adding multiple EV chargers, converting to all-electric HVAC, or building a substantial ADU that pushes the load beyond a standard 200A design.
No, square footage alone does not guarantee utility approval for a 320 amp electrical service.
The utility requires a detailed load calculation and a service feasibility review to confirm that the local infrastructure can support the increased demand before any work begins.
Yes, but the possible configurations vary based on local codes and utility rules.
A project-specific design is required to determine how the service conductors will split to feed dual main panels or a combination of main and subpanels throughout the property.
It depends entirely on the utility's existing infrastructure and their engineering review.
A 320 amp service upgrade often requires the utility to evaluate their transformer and service point, but an electrical contractor cannot universally determine their requirements in advance.
Project timing depends on utility coordination, equipment availability, and the complexity of the installation.
Because the process requires utility feasibility reviews, engineering approvals, and multiple inspections, the timeline varies significantly for every home.
Costs vary widely based on utility requirements, necessary civil work like trenching, and the specific meter equipment needed.
Factors such as whether the service is overhead or underground, the number of panels, and existing equipment conditions all shape the final scope and investment.