Charleston, SC
How Much Does Solar Cost in Charleston, SC?
The fees the City and your utility set, and the arithmetic that turns any quote into a net cost.
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What moves the cost of solar on a Charleston house
Four local items show up in Charleston quotes that a national estimate leaves out.
A structural letter sealed by a South Carolina design professional is required on every roof or ground array permit, because the City designs to 150 mph wind and seismic category D2.
A home inside the Old and Historic District or Old City District pays for a Board of Architectural Review application, and may need a rear-slope or accessory-building layout that adds racking and wire runs.
Equipment in a flood zone may need to be mounted higher, with longer conduit. And a roof near the end of its life should be replaced first; the median Charleston home was built in 1994 (ACS 2023 5-year).
Your utility changes the value side more than the cost side. Dominion’s Solar Choice rider caps a system at 20 kW AC and sizes it to your annual use; Berkeley Electric’s rider caps it at annual kWh ÷ 1,800. A bigger system than either allows is not a saving.
City of Charleston solar permit fees by contract value
Solar is billed as a “Residential – Alterations & Repairs” permit on the total contract price. These are the three contract values used in the scenarios below.
| Example contract | Permit fee | Plan review (50%) | Application fees (building + electrical) | City total |
|---|---|---|---|---|
| $15,000 | $85 | $42.50 | $80 | $207.50 |
| $25,000 | $135 | $67.50 | $80 | $282.50 |
| $35,000 | $185 | $92.50 | $80 | $357.50 |
HyreSolar arithmetic on the City of Charleston Building and Trade Permit Fee Schedule, effective 1 October 2019, retrieved 5 October 2026. Contract values are examples, not Charleston prices.
Add $0.25 per amp if the electrical sub-permit includes a new or upgraded service (a 200-amp service is $50). A required re-inspection is $100. Work started before the permit is issued pays double. Plan revisions after the first review are $50 per trade on a residential job.
Charleston line items a solar quote should show separately
| Item | Who sets it | Published amount | Notes for Charleston |
|---|---|---|---|
| Equipment: panels, inverter, racking | Market | No local figure published | Ask for brand, model and quantity on each line; compare on the proposal analyzer |
| Labour and installation | Market | No local figure published | Roof attachments need a roofer-classified or builder licence, not only a solar panel installer registration |
| Structural engineering letter | Market | No local figure published | Required by the City for every array |
| City building permit + plan review | City of Charleston | Formula above | Billed on the total contract price |
| Electrical sub-permit | City of Charleston | $40 application, plus $0.25/amp for a service change | No inspections run under the sub-permit itself |
| BAR application | City of Charleston | Not listed in the building fee schedule | Only in designated historic districts; ask the BAR office for the current fee |
| Utility application | Dominion / Berkeley Electric | Dominion $100; Berkeley Electric $150 + $50 inspection | Dominion’s figure is from its April 2022 programs chart; confirm when you apply |
| Main panel or service upgrade | Market + City fee | $0.25/amp City fee | Common on older Peninsula and West Ashley houses |
| Roof replacement | Market | No local figure published | Cheaper to do before the array than to remove and reinstall it later |
City and utility amounts retrieved 5 October 2026. Market items vary by quote; we do not publish an average.
Why there is no Charleston price per watt on this page
A cost-per-watt figure is useful only when it comes from real local contracts. We will publish one for Charleston when we hold twelve sourced, dated quotes from the city, and we will not scale a national number down to fit.
Until then, divide each quote you receive by its DC system size in watts and compare quotes with each other, not with an internet average. How cost per watt works.
Three Charleston scenarios: gross price, permit, state credit and net
Every input here is an example, not a quote. Each assumes a homeowner with $5,000 of South Carolina income tax liability a year (example), which limits the credit to $2,500 a year: the lesser of $3,500 or 50% of liability.
| Scenario | Example contract (gross) | City permit total | SC credit (25%) | Tax years to claim it | Net after credit and fees |
|---|---|---|---|---|---|
| Small (example) | $15,000 | $207.50 | $3,750 | 2 | $11,557.50 |
| Medium (example) | $25,000 | $282.50 | $6,250 | 3 | $19,132.50 |
| Large (example) | $35,000 | $357.50 | $8,750 | 4 | $26,707.50 |
Net = example contract + City permit total + $100 Dominion application − SC credit. Assumes the permit is not already inside the contract price and no service upgrade. Credit rules: SC Code §12-6-3587, retrieved 5 October 2026.
The 10-year carryforward means all three examples recover the full credit, but the large one waits until the fourth return. A household with more liability claims faster, up to the $3,500 ceiling. More on the SC solar tax credit.
What 1,000 kWh of solar is worth on a Charleston Dominion bill
Under Solar Choice and Rate 5, a kilowatt-hour you use as it is produced is worth the price of its hour. This is the value of 1,000 kWh used in each period.
| Rate 5 period | Hours | Price per kWh | Value of 1,000 kWh used on site |
|---|---|---|---|
| On-peak | 4–8 p.m. in summer (May–Sep), 6–9 a.m. in winter | 29.907¢ | $299.07 |
| Off-peak | All other hours | 15.074¢ | $150.74 |
| Super off-peak | 1–5 a.m. all year, plus noon–3 p.m. in winter | 9.623¢ | $96.23 |
Dominion Energy South Carolina Rate 5, effective July 2026 billing (PSC Order No. 2026-374), retrieved 5 October 2026.
Most summer midday output lands in off-peak, and winter output between noon and 3 p.m. lands in super off-peak.
Surplus nets against lower-priced periods the same month, then banks forward; the November payout is at avoided cost, below all three prices. Simple payback = net cost ÷ (annual kWh used on site × the price of its hours).
Put your own bill into the savings calculator or payback calculator.
How Charleston electricity rates change the savings
Moving to Rate 5 is part of the Solar Choice deal, so the comparison that matters is your current Rate 8 bill against a Rate 5 bill with solar.
Rate 8 charges $0.36164/day plus 15.878¢ for the first 800 kWh and 17.442¢ above 800 kWh in summer; Rate 5 charges $0.4274/day, about $12.99 a month, which your solar credits cannot reduce.
A household that runs air conditioning hard between 4 and 8 p.m. in summer pays 29.907¢ for that energy on Rate 5, so the switch can raise the evening part of the bill even as the panels cut the daytime part.
Ask for both bills, line by line, in the proposal. Berkeley Electric members keep their standard rate and earn 6.03¢ on exports, so their savings depend on self-use against an average residential price of 14.93¢ in 2024.
The battery side of this is on solar battery storage in Charleston, and the loan side on solar financing in Charleston.
Batteries and electrical upgrades in a Charleston quote
The City’s solar guidance does not mention batteries, and its fee schedule has no storage line, so ask the installer how the battery will be permitted and whether it adds an electrical permit fee.
Older houses on the Peninsula may need a service upgrade to land a solar breaker; the City fee for that is $0.25 an amp, but the electrician’s work is the larger cost.
Check your panel first with the panel upgrade check. Compare quotes line by line with the checklist on solar installers in Charleston.
Questions
How much does solar cost in Charleston, SC?
Is the solar permit fee in Charleston based on system size?
How long does the SC tax credit take to recover on a Charleston system?
Does switching to Dominion Rate 5 raise my bill?
Is there a federal solar credit for a Charleston home in 2026?
What does a historic-district solar job add to the cost?
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