Panel upgrade costs in Northern Virginia vary meaningfully by county. A 100A-to-200A upgrade in Arlington averages $2,400-$3,200, while the same project in Loudoun County typically runs $2,200-$3,000. These differences reflect permit fee structures, utility coordination requirements, and labor market rates in each jurisdiction. This guide draws on real project data from AJ Long Electric's recent work across the region to give you the most accurate county-by-county cost picture available.
Key Takeaways
- Fairfax County panel upgrades: $2,200-$3,600 depending on amperage and service conditions
- Arlington County upgrades run slightly higher ($2,400-$3,800) due to higher labor costs and older housing stock
- Loudoun County is often 10-15% less expensive than inner NoVA due to lower overhead and permit fees
- Prince William County offers the lowest average costs in the region at $1,900-$3,200
- Homes built before 1980 have a 35-40% higher probability of requiring service entrance upgrades alongside the panel work
- Dominion Energy serves most of Fairfax, Arlington, and Prince William; NOVEC serves much of Loudoun — coordination timelines differ
Fairfax County Panel Upgrade Costs
Fairfax County is the most active electrical permit market in Virginia, processing over 18,000 electrical permits annually. Panel upgrades are the single largest category. A standard 100A-to-200A upgrade in Fairfax County costs $2,200-$3,600 fully installed, including permit and Dominion Energy coordination. The Fairfax County permit fee for a panel upgrade is $160-$235 depending on project valuation, applied through the Land Development Services online portal.
| Project Type | Materials | Labor | Fairfax Permit | Total |
|---|---|---|---|---|
| 100A to 200A (panel only) | $550-$850 | $950-$1,850 | $165-$210 | $2,200-$3,100 |
| 100A to 200A + service entrance | $900-$1,400 | $1,500-$2,500 | $185-$235 | $2,900-$4,300 |
| 200A panel replacement (same amperage) | $450-$750 | $850-$1,600 | $160-$200 | $1,800-$2,850 |
| 200A to 400A upgrade | $1,200-$2,100 | $1,800-$3,600 | $200-$300 | $3,900-$6,500 |
| Subpanel (60A-100A) | $300-$600 | $600-$1,200 | $120-$165 | $1,100-$2,000 |
Fairfax County's inspection process is well-organized, with electrical inspections typically scheduled within 2-4 business days of permit application. However, projects that require Dominion Energy to disconnect the meter for service entrance work can add 2-5 business days to project timelines. Homes in McLean, Great Falls, and Vienna often have custom configurations or unusual panel locations that add labor time.
Arlington County Panel Upgrade Costs
Arlington County has the highest average panel upgrade costs in Northern Virginia, driven by the county's older housing stock (median home age: 1964), dense urban environment, and strong demand for licensed electrical contractors. A standard 100A-to-200A upgrade in Arlington averages $2,400-$3,800. The county's permit fee structure is value-based, starting at $95 for the filing fee plus $7.50-$9.50 per $1,000 of project value.
Outdated or overloaded electrical panels are a safety risk. Our team specializes in 200-amp upgrades throughout Northern Virginia, with same-day panel assessments available. Call (703) 997-0026 to get started.
Roughly 42% of Arlington's single-family homes and older apartment buildings were built before 1970, making the probability of discovering outdated wiring, insufficient grounding, or service entrance issues higher than in younger suburban jurisdictions. Our data shows that Arlington panel upgrades require service entrance work approximately 28% of the time, compared to 18% in Loudoun County's newer subdivisions.
| Project Type | Arlington Avg Cost | vs. Fairfax | vs. Loudoun |
|---|---|---|---|
| 100A to 200A (standard) | $2,400-$3,800 | +8-12% | +15-20% |
| 200A panel replacement | $1,900-$3,000 | +5-8% | +12-18% |
| 100A to 200A + service upgrade | $3,200-$5,200 | +10-15% | +18-25% |
| 200A to 400A | $4,500-$7,500 | +12-15% | +20-28% |
Loudoun County Panel Upgrade Costs
Loudoun County offers the best value for panel upgrades in Northern Virginia's inner ring of counties. A 100A-to-200A upgrade in Loudoun typically costs $2,000-$3,000 fully installed. Lower overhead costs for contractors serving the Ashburn, Sterling, Leesburg, and Purcellville corridors, combined with Loudoun County's competitive permit fee structure ($85-$175 for panel upgrades), keep prices accessible. NOVEC serves the majority of Loudoun County rather than Dominion Energy, and NOVEC's disconnect/reconnect coordination is generally faster.
Loudoun's housing stock skews significantly newer than Fairfax or Arlington. Roughly 65% of single-family homes in Loudoun were built after 1990, meaning most already have 200A service. In these cases, homeowners often need panel replacement (same amperage, new box) rather than a true upgrade, which costs less. The upgrade scenario is most common in older Leesburg, Round Hill, and Purcellville neighborhoods.
- Ashburn / Sterling (newer construction): 200A replacement averages $1,750-$2,600
- Leesburg / Round Hill (older areas): 100A to 200A upgrade averages $2,100-$3,200
- Purcellville / Lovettsville: Add $100-$250 for contractor travel from eastern Loudoun base areas
- Loudoun permit fee: $85-$175 for residential panel work
Prince William County Panel Upgrade Costs
Prince William County offers the lowest average panel upgrade costs in the NoVA metro area, making it the most affordable jurisdiction for this type of work. A 100A-to-200A upgrade in Manassas, Woodbridge, or Dale City averages $1,900-$3,000. The county's permit fees are competitive ($75-$165), and the lower cost of living in the area means electrician overhead is proportionally lower than in inner-ring suburbs. Dominion Energy serves most of Prince William County.
| County | 100A to 200A Upgrade | Permit Fee | Service Utility | Dominion Coordination Days |
|---|---|---|---|---|
| Fairfax County | $2,200-$3,600 | $165-$235 | Dominion Energy | 2-5 business days |
| Arlington County | $2,400-$3,800 | $95 + value fee | Dominion Energy | 2-5 business days |
| Loudoun County | $2,000-$3,000 | $85-$175 | NOVEC (most areas) | 1-3 business days |
| Prince William County | $1,900-$3,000 | $75-$165 | Dominion Energy | 2-5 business days |
| City of Alexandria | $2,300-$3,700 | $100-$220 | Dominion Energy | 3-6 business days |
What Drives Cost Differences Within Counties
Within each county, project-specific factors create significant cost variation. The five most impactful variables we see on panel upgrade quotes are: (1) service entrance condition — replacing degraded 100A service entrance cable adds $600-$1,200; (2) panel location — basement panels with good clearance cost less than panels in cramped closets or attached garages with tight access; (3) grounding system — homes without two proper ground rods need this corrected per NEC 250.53, adding $150-$400; (4) existing breaker count — more circuits mean more AFCI breakers and more transfer time; (5) asbestos or lead paint — older Fairfax and Arlington homes built pre-1978 may require abatement consultation before opening walls.
Get a County-Specific Quote from AJ Long Electric
AJ Long Electric serves all four major Northern Virginia counties and the City of Alexandria with panel upgrades, subpanel installations, and service entrance upgrades. Our quotes are itemized by materials, labor, permit fees, and utility coordination — no line-item surprises. We handle the Dominion Energy and NOVEC coordination so you do not have to make a single call to the utility. Contact us at (703) 997-0026 for a free written estimate. We will tell you exactly what your project will cost before we start, and that number will not change.
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Written by
Matt Long
Master Electrician
Our team of licensed electricians brings over 40 years of combined experience serving Northern Virginia. We're committed to providing expert electrical solutions with a focus on safety, quality, and customer satisfaction.
Reviewed by AJ Long Electric Master Electricians · VA License #2705031092 · View Credentials
