100A Service Upgrade
A 100 amp service upgrade replaces or reconfigures a home's electrical service to safely handle 100 amps of power. Planned equipment additions and a formal load assessment dictate whether this baseline capacity is enough or if a larger service is required.
- You are replacing an outdated fuse box or lower-capacity system.
- You own a smaller home, cottage, cabin, or accessory dwelling unit (ADU).
- You need to replace damaged exterior service equipment without increasing capacity.
- You are preparing a property for sale and need to pass an inspection.
- You want a modern electrical foundation before mapping out future load additions.
What a 100 Amp Service Project Includes
Depending on your existing setup, a 100-amp project spans from a formal capacity evaluation to utility coordination and breaker panel installation. The scope follows local safety requirements and any required inspections.
Capacity Assessment
Evaluating your current and planned electrical usage is a critical first step. We ensure that a 100-amp target will safely support your household appliances, lighting, and general power demands without tripping.
Older System Replacement
Transitioning an outdated system requires carefully removing old fuse-based or low-capacity main panels. This clears the way for a modern, breaker-based distribution system that improves safety.
Panel and Meter Base Coordination
A true upgrade requires aligning your new interior panel with an updated or verified exterior meter base. We ensure the service entrance conductors and metering equipment match your new capacity.
Grounding and Bonding
Modern electrical codes demand robust grounding and bonding to protect your property from electrical faults. Grounding and bonding are updated within the project scope where required.
Permit and Utility Management
Upgrading your main service requires strict coordination with local authorities. Octopel coordinates required permits and utility disconnect and reconnect steps where they apply.
Understanding Capacity and Equipment Upgrades
Deciding on the right electrical scope depends on your home's size, planned appliances, and existing infrastructure. Compare these common options to see what fits your situation.
100A vs 200A Service
Typical application
Smaller homes or ADUs
Often considered for properties with basic electrical loads and gas heating appliances.
Heavy appliance support
Limited capacity
May struggle to support modern electric vehicles and heat pumps simultaneously.
Future expansion
Minimal overhead
If you plan significant electrical additions, a load assessment can show whether a larger service makes sense.
Panel Replacement vs. Service Upgrade
Core project objective
Replacing interior panel
Swaps the indoor distribution board without changing incoming utility power.
Utility involvement
Generally minimal
A full service upgrade requires utility coordination to update the meter and exterior lines.
Total capacity increase
Remains the same
A true service upgrade is required to fundamentally increase the amperage available to the property.
Load calculations determine the exact capacity your property safely requires.
Utility guidelines dictate the specific exterior equipment needed for any service change.
How We Manage Your 100 Amp Upgrade
From the initial evaluation to the final utility reconnection, we structure the project to minimize disruption while coordinating required inspections.
- Initial System ReviewWe assess your existing service, exterior meter setup, and planned electrical loads to objectively confirm that 100 amps is the appropriate target for your home.
- Scope and PlanningOur team defines the strict requirements for the new panel, meter base, and service entrance based on the initial assessment and local utility guidelines.
- Permitting and CoordinationWe secure necessary municipal permits and schedule the required power disconnects and reconnects directly with your local utility company.
- Installation and RewiringTechnicians safely remove the old equipment, mount the new 100A main panel, and carefully reconnect, balance, and label all of your existing circuits.
- Testing and VerificationBefore finalizing the project, we perform comprehensive safety checks to ensure proper grounding, bonding, and highly reliable power distribution.
Common Reasons for a 100A Upgrade
Homeowners typically pursue a 100-amp upgrade to replace an unsafe fuse box, remodel a small space, or repair damaged exterior equipment. Select your scenario below to see how we approach it.
Upgrading an old fuse box
You have an outdated, fuse-based system that makes it difficult to reset circuits or secure standard homeowner insurance policies.
Upgrading an old fuse box
You have an outdated, fuse-based system that makes it difficult to reset circuits or secure standard homeowner insurance policies.
Our Approach to Residential Electrical Upgrades
Executing a panel and service switch requires careful planning and precise craftsmanship. Drawing on our 10+ years of experience and over 1,000 residential repairs, Octopel ensures your home's electrical system is built for safety and longevity.
Thorough load assessments
We evaluate capacity before recommending a path. We formally evaluate your current and planned usage to verify that 100 amps is truly sufficient for your home.
Respect for your home
Working in occupied spaces means minimizing disruption, maintaining a clean work area, and safely managing power outages during the utility switch.
1,000+ Residential Repairs
Electrical troubleshooting and repairs completed in occupied homes.
Washington Electrical Contractor
Washington electrical contractor registration OCTOPEL770O1.
Code-compliant safety
Modern safety standards demand robust grounding and bonding. We ensure your newly upgraded 100 amp electrical service provides maximum protection against faults.
What Influences the Scope of Your Upgrade
The complexity and overall requirements of a 100-amp upgrade depend on your existing electrical infrastructure, planned power usage, and local utility regulations.
Existing equipment condition
Upgrading from an antiquated fuse box often requires more extensive rewiring and foundational safety updates than replacing a relatively modern panel.
Planned electrical loads
Adding heavy appliances dictates whether a 100A system is sufficient or if a higher capacity service is strictly required.
Routing and infrastructure
The difference between overhead and underground service lines, along with meter placement, significantly impacts the utility coordination.
Jurisdictional requirements
Local municipalities and utility providers dictate specific grounding, bonding, and exterior equipment standards that must be met.
Customer Reviews
Verified feedback from residential 100a 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 update your home's electrical service?
Submit your project details below. During business hours, a manager responds within one hour to discuss your situation. On-site visits are scheduled based on your specific needs, property location, and team availability.
100 Amp Services in Western Washington State
Octopel manages 100 amp panel replacements and complete service upgrades for homes and small 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?
Frequently Asked Questions
Answers to common questions about updating your electrical service capacity.
A 100 amp service upgrade involves replacing or updating the main electrical equipment—such as the meter base, service entrance cables, and main breaker panel—to handle 100 amps of total power. It provides a safe, modern foundation for smaller homes or basic electrical loads.
No, they are distinct projects. A 100 amp panel upgrade typically refers to replacing the indoor distribution board while keeping the existing incoming power capacity. A true service upgrade involves updating the utility connection, meter base, and service conductors to increase or refresh the total incoming amperage.
It depends entirely on your home's size and major appliances. While an upgrade to 100 amp service is often adequate for smaller homes, cabins, and properties with primarily gas heating, larger homes with heavy electric loads usually require more capacity. We determine this through a formal load calculation.
Yes. Transitioning an outdated system to a modern 100 amp electrical service is a common necessity for safety and insurance compliance. This process replaces the fuses with modern breakers and updates the exterior utility equipment. Learn more about fuse box replacement.
You should consider a larger capacity if you plan to electrify your home significantly. Adding electric heat, multiple air conditioning units, or high-draw appliances often pushes a property beyond a 100A threshold, making a 200A service upgrade the necessary choice.
Not necessarily. While highly efficient heat pumps or low-amperage EV chargers might fit into a carefully managed 100A load profile, many modern heavy appliances require dedicated capacity that easily exceeds this limit. A careful assessment is required before installation.
Yes, utility involvement is mandatory for any service upgrade. Changing the meter base, updating the service entrance conductors, and disconnecting power from the grid require strict coordination and approval from your local utility provider.
Timing depends on utility scheduling, local permit processing, and the complexity of your existing wiring. Once approvals are in place, the physical installation requires temporarily disconnecting your power to safely execute the work, followed by municipal inspections.
Pricing varies based on your existing infrastructure, the condition of your wiring, and local jurisdiction requirements. A 100 amp panel replacement or a full service upgrade requires an on-site evaluation to determine the specific scope of work and materials needed.