A Full Service Upgrade
A 400 amp upgrade reaches beyond the breaker box. Compare quotes for the meter socket, service entrance conductors, grounding, and panel together so a lower equipment price does not hide missing work.
Guides
How Much Does It Cost to Upgrade to 400 Amp Service in Phoenix?
Phoenix Electrical Panel Upgrades quotes 400 amp service upgrades around the property's wire run, panel location, and utility connection. Residential projects in Phoenix typically cost $8,000 to $12,000; understanding the full service scope helps you compare that price with a smaller panel replacement.
Quick Summary
- Residential 400 amp service upgrades generally cost $8,000 to $12,000, including the panel, meter socket, service conductors, grounding, permit, and utility coordination.
- Commercial projects range from $15,000 to $100,000 or more, with three-phase requirements, transformer capacity, and conduit runs driving the difference.
- Long conductor runs, underground trenching, meter relocation, and older equipment can increase the scope. A panel-only price does not cover the same work as a full service upgrade.
- Confirm the required capacity with a load calculation, then account for permits, inspections, and utility approval. Installation time and the utility's scheduling window are separate parts of the project.
What Your 400 Amp Budget Covers
Conductor and Riser Costs
Longer service runs increase material costs: 4/0 copper conductor runs about $21 per foot. A new riser assembly alone can cost $2,500, making the utility connection and cable route important parts of the estimate.
Load Calculation Before a Quote
Start with a site visit and a load calculation for existing equipment and planned additions. Confirm whether the property needs 400 amps before comparing panel configurations or ordering equipment.
Equipment and Routes That Affect Cost
400 Amp Service Entrance and Meter Socket
The meter socket and service entrance are part of a full capacity upgrade. Their condition and location help explain why replacing only the panel costs less.
One 400 Amp Panel Versus Two 200 Amp Panels
A single 400 amp main panel and a 400 amp service feeding two 200 amp panels involve different equipment and labor. Compare the complete service layout for the home, workshop, or casita.
Underground Conduit Route to a 400 Amp Meter
Buried service runs require trenching and conduit. The distance between the utility connection and meter affects the amount of conductor and site work in the quote.
400 Amp Upgrade Timeline
Residential Job Duration
Most residential upgrades take 1 to 3 days of work. A transformer or meter change can extend the schedule beyond the installation itself.
Panel and Service Entrance Work
The panel and service entrance portion typically takes 1 to 2 days. Confirm how that work fits around the scheduled utility disconnect and reconnect.
Commercial Installation
Commercial and industrial work can take several days to a few weeks. Transformer scheduling and inspection cycles influence when the upgraded service can be energized.
Approval and Equipment Lead Time
Start utility review early and confirm equipment availability before setting an installation date. Permit, inspection, and utility arrangements need to align with the work.
Phoenix Electrical Upgrade Cost Comparison
Compare the Full Service Scope Behind Each Price
| Project scope | Cost range | Included work or main cost drivers |
|---|---|---|
| Residential 400 amp service upgrade | $8,000-$12,000 | New panel, meter socket, service entrance conductors, grounding upgrade, permit, and utility coordination. |
| Commercial 400 amp service upgrade | $15,000-$100,000+ | Scope depends on three-phase requirements, transformer capacity, conduit runs, and building complexity. |
| Residential 200-320 amp service upgrade | $6,400-$8,750 | Panel replacement using existing service entrance conductors, where suitable for the project. |
| Panel-only upgrade or circuit breaker replacement | $1,240-$2,066 | Smaller panel, breaker, or fuse box replacement and conversion work; a different scope from a full 400 amp service change. |
Compare each bid's equipment, conductor route, utility work, and permit scope. A site visit and load calculation establish the quote for the property.
Size the Service for Your Actual Load
Most Phoenix homes under 2,500 square feet can operate on 200 amp service, but floor area alone does not determine the right capacity. Homes over roughly 4,000 to 5,000 square feet with multiple HVAC zones, a pool, and an EV charger commonly need 400 amps. A smaller property may also need more capacity when a workshop, guest house, or ADU shares the service. The deciding factor is the electrical load, evaluated using NEC load calculation methods. Added capacity can provide headroom for these combined demands, while a standard 200 amp upgrade or subpanel may suit a property with lighter loads. Recurring breaker trips also call for an evaluation of the existing equipment before deciding on a larger service.
Why Similar Properties Receive Different Quotes
Underground service adds trenching and conduit, while an overhead connection may involve a weatherhead or riser. Homes built before the 1980s may need meter box replacement or relocation, and existing aluminum versus copper wiring changes connection work. In Maryvale and central Phoenix, homes dating to the 1960s and 1970s may have aging panels that need removal as part of the project. Panel condition, grounding, bonding, and working clearance should be evaluated alongside capacity. A long feeder to a detached workshop or casita adds another part of the scope. Commercial projects can add conduit through slabs or tenant improvements and transformer capacity work, so matching amperage alone does not make two quotes comparable.
Common Follow-Up Questions
Can two 200 amp panels replace one 400 amp panel? A properly designed 400 amp service can feed two 200 amp panels, with equipment and labor costs that differ from a single-main layout. How do you move from 200 to 400 amps? The process begins with a load calculation, utility review, and permits, followed by professional replacement of the required service equipment and inspections before reconnection. Do permits belong in the quote? Include the applicable City of Phoenix or Maricopa County permit and inspection work when comparing bids. This is work for a licensed electrician coordinating with the serving utility; the final price depends on the actual service route and equipment needs.
Plan Your Upgrade
Get a Quote for Your Property's Load
Share the existing service size, planned EV charging or other major loads, and any workshop or casita plans. A property walk and load calculation can confirm the required capacity and define the equipment, utility work, and installation scope for a firm quote.