400A Service Upgrade
A 400 amp service upgrade provides high-capacity residential power for very large homes and heavy electrification projects. Whether this scope fits depends on a proper load calculation, existing equipment, and utility requirements rather than home size alone.
- You are planning a whole-home electrification project.
- You have multiple electric vehicle chargers.
- You are adding an accessory dwelling unit or large workshop.
- Your current electrical load profile exceeds 200A capacity.
- You are installing high-draw heat pump and battery storage systems.
What a 400A Upgrade Can Include
A heavy-duty capacity increase involves careful coordination between your property and the utility. Depending on your home's existing system and planned electrical loads, the project may include several key phases.
Load and Capacity Assessment
We evaluate your current and planned electrical draw to confirm high-capacity requirements. This step verifies exactly what your new equipment must safely support.
Service Equipment Coordination
Upgrading your electrical entrance requires careful coordination with your utility provider. We manage the meter base configuration to meet their specific connection standards.
Main and Distribution Panels
A 400 amp panel installation often involves configuring dual 200 amp main panels or heavy-duty subpanels. We route this capacity safely throughout your residential property.
Grounding and Bonding Updates
Expanding capacity requires robust safety measures. We verify and upgrade your grounding systems so the higher amperage flows safely under all fault conditions.
Permitting and Inspections
Octopel coordinates the necessary paperwork and municipal inspectors to verify full code compliance.
Comparing High-Capacity Service Configurations
Deciding to upgrade to 400 amp service depends heavily on your planned electrical loads, not just home size. Here is how heavy-duty configurations differ from standard setups.
Evaluating Capacity Need
Primary deciding factor
Total concurrent draw
Planned electrical load dictates capacity.
Typical standard service
Standard 200 amp capacity
Sufficient for most typical modern homes.
High-capacity requirement
400 amp electrical service
Required for dual EVs, ADUs, and major heating.
Distribution Configuration
Common heavy-duty setup
Dual 200 amp main panels
Splits the heavy load into manageable halves.
Alternate distribution approach
Single main plus subpanels
Routes power to specific outbuildings or wings.
Utility connection type
High-capacity meter base
Must match the utility provider's standards.
The right configuration varies by project and jurisdiction.
We complete a formal load calculation before recommending a specific equipment layout.
How We Handle Your Service Upgrade
Increasing a home's power capacity is a major project that requires municipal and utility coordination. We guide you from the first calculation to final inspection.
- Load Assessment and ConsultationWe assess your current system and planned heavy additions to confirm exact capacity needs. This helps outline the required scope and necessary utility involvement.
- System Design and PlanningOur team determines the equipment layout, such as dual panels or high-capacity subpanels, based on the existing wiring system and planned work.
- Utility CoordinationWe communicate directly with your utility provider to align our equipment design with their specific meter and connection requirements for heavy service.
- Installation and WiringWe safely disconnect power, mount the new heavy-duty electrical components, route necessary circuits, and establish updated grounding systems for protection.
- Final Inspection and TestingWe verify all connections and coordinate with municipal inspectors to confirm the newly upgraded capacity meets strict electrical and safety codes.
Situations That May Require a Capacity Increase
Homeowners often notice they need more power when planning major property additions. Select your situation to see how a heavy-duty service handles it.
I am planning whole-home electrification.
Converting gas heating, hot water, and appliances to electric equivalents drastically changes your home's load profile. Upgrading provides sufficient overhead for constant heavy demand.
I am planning whole-home electrification.
Converting gas heating, hot water, and appliances to electric equivalents drastically changes your home's load profile. Upgrading provides sufficient overhead for constant heavy demand.
Octopel's Approach to High-Capacity Upgrades
Upgrading a primary power supply disrupts daily life and requires technical precision. With over 1,000+ residential repairs and extensive upgrade experience across Western Washington State, we prioritize safety, careful coordination, and minimal home downtime.
Code and Utility Compliance
We navigate specific local utility requirements and municipal electrical codes to prepare the new meter base and panels for municipal inspection.
Working in Occupied Homes
Major panel replacements require temporarily shutting off your power. We carefully plan the execution to minimize the time your family is left without electricity.
1,000+ Residential Repairs
Electrical troubleshooting and repairs completed in occupied homes.
Washington Electrical Contractor
Washington electrical contractor registration OCTOPEL770O1.
Rigorous Safety Verification
After the new heavy-duty equipment is installed, we conduct thorough testing of connections, grounding, and bonding before energizing your new electrical system.
What Affects Upgrade Scope
Expanding residential capacity is a complex project. Several technical and environmental factors influence the overall requirements.
Existing Service Setup
The condition and location of your current meter base, primary wires, and grounding systems determine how much existing infrastructure must be replaced.
Planned Electrical Loads
Your future power demands dictate the exact equipment ratings. Heavy concurrent loads like heat pumps and multiple EV chargers require specialized setups.
Distribution Configuration
Routing power from a central point to various subpanels or a detached ADU involves additional wire runs, trenching, and secondary breaker hardware.
Utility and Jurisdiction Requirements
Every local utility has unique rules regarding heavy-duty connections. Permitting, inspection coordination, and site-specific utility mandates shape the final plan.
Customer Reviews
Verified feedback from residential 400a 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 →
Ready to discuss your power needs?
Submit your project details below. During business hours, a manager responds within one hour to clarify your situation. An on-site visit is then scheduled based on your location and team availability.
Serving Western Washington State
Octopel provides professional high-capacity electrical service upgrades for homes 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?
Frequently Asked Questions
Answers to common questions about high-capacity residential service increases.
It is a major electrical capacity increase that allows a residential property to draw more total power from the utility. This upgrade involves replacing the meter base, upgrading the primary wiring, and installing heavy-duty distribution equipment to support significant electrical loads like whole-home electrification.
Not entirely, though they happen together. A service upgrade increases the total capacity coming into the home from the utility grid. A panel upgrade involves changing the physical electrical panel to safely distribute that incoming power to your household circuits.
It depends on your expected concurrent electrical load rather than just the physical size of your house. We perform a load calculation to determine if standard capacity is sufficient, or if heavy-drawing appliances like multiple EV chargers and heat pumps make a larger service necessary.
They are often related to the same high-capacity residential configuration. Utilities frequently use a 320 amp continuous-rated meter socket to supply what is broadly called a 400 amp service. If you are researching a 320A service upgrade, the resulting system capacity and utility requirements are usually identical.
Yes, in many residential setups. Instead of installing one massive commercial-style panel, electricians often split a 400 amp service into two separate 200 amp main panels. This configuration makes it easier to manage household circuits and distribute power across a large property.
Often, yes. Expanding capacity to this level commonly involves new, higher-capacity meter equipment, but the exact requirements depend on the existing equipment and the utility's specifications.
Absolutely. Your local utility provider must approve the capacity increase, disconnect the power, and sometimes upgrade the physical wires running from their transformer to your property. We coordinate with them closely throughout the planning and execution phases.
Timing depends heavily on municipal permitting, utility coordination, and the complexity of your property's existing wiring. While the physical equipment installation takes carefully scheduled downtime, the entire process from initial assessment to final energized inspection spans a longer period.
Costs vary significantly by project. The final scope depends on utility requirements, the distance from the transformer, trenching needs, and the specific distribution panels required. We outline all anticipated factors after completing a thorough on-site evaluation.