How much do solar panels cost in St. Louis?
By Our research team · Last verified · Methodology
Most 8 kW solar installs in St. Louis cost $17,500–$27,550 before incentives, for an 8 kW system that makes about 32 kWh on an average day here. The typical St. Louis job is $21,350.
How we get this data- Typical
- $21,350
- Low end
- $14,750
- High end
- $34,300
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St. Louis's price band
St. Louis is cheaper than 70% of the 195 US metros we price for solar panel work.
An 8 kW system with standard panels is $17,500–$27,550 installed in St. Louis, about $2,650 per kW at the typical price. A 6 kW system runs $13,750–$21,650 and a 10 kW system $21,250–$33,450. Premium panels add 10–25%.
Many St. Louis brick homes have older electrical service that needs an upgrade before solar. Ameren Missouri handles the hookup.
Prices are before incentives. The federal homeowner credit is gone for 2026 installs (it ended for expenditures after December 31, 2025), so any help now comes from your state, your utility or a lease company's own business credit.
Comparing cities, or after the US-wide picture? See the national guide: Solar panel cost in the USA.
$17,500–$27,550 installed in St. Louis for an 8 kW home solar system with standard panels, typically $21,350 with no federal tax credit in 2026. That is about $2,650 per kW. Verified November 2026. Get free St. Louis quotes →
- 8 kW system, installed: $17,500–$27,550 ($21,350 typical, about $2,650 per kW)
- 6 kW: $13,750–$21,650; 10 kW: $21,250–$33,450; premium panels add 10–25%
- Battery added with solar: $8,750–$18,000 for 10–13.5 kWh
- No federal tax credit for systems you own installed after December 31, 2025
- About 32 kWh a day from 8 kW at local sun levels; payback near 16 years at full-rate credits
Prices verified November 2026 · Cross-referenced against 42+ American pricing sources · See methodology
Installed prices before any state or utility incentive, and with no federal credit. St. Louis metro, re-verified November 2026. Battery and inverter hardware is priced nationally, so those lines move less from city to city.
| Service | Low | Typical | High |
|---|---|---|---|
| 8 kW solar system, standard panelsinstalled | $17,500installed | $21,350 | $27,550 |
| 6 kW solar system, standard panelsinstalled | $13,750installed | $16,800 | $21,650 |
| 6 kW solar system, premium panelsinstalled | $15,150installed | $19,300 | $27,050 |
| 8 kW solar system, premium panelsinstalled | $19,250installed | $24,550 | $34,450 |
| 10 kW solar system, standard panelsinstalled | $21,250installed | $25,950 | $33,450 |
| 10 kW solar system, premium panelsinstalled | $23,400installed | $29,850 | $41,850 |
| 12–13 kW solar system for a large homeinstalled | $25,300installed | $31,950 | $42,450 |
| Price per kW, standard panelsper kW | $2,200per kW | $2,650 | $3,450 |
| 5 kWh battery added with solarinstalled | $5,350installed | $6,800 | $8,250 |
| 10–13 kWh battery added with solarinstalled | $8,750installed | $12,650 | $16,500 |
| Tesla Powerwall 3 (13.5 kWh), installedinstalled | $11,200installed | $14,350 | $18,000 |
| Hybrid inverter upgrade (battery-ready)installed | $2,450installed | $3,400 | $5,350 |
| String inverter replacementinstalled | $1,450installed | $2,250 | $3,400 |
| Microinverter replacement, one unit (out of warranty)per unit | $290per unit | $430 | $720 |
| Solar panel cleaning (15–25 panels)per visit | $140per visit | $290 | $480 |
| System health check / inspectionper visit | $140per visit | $240 | $330 |
| Remove and reinstall panels for a re-roof (about 20 panels)per job | $3,350per job | $4,750 | $7,650 |
| Critter guard around the array (8–10 kW)installed | $670installed | $1,150 | $1,600 |
| Main panel upgrade for solar (to 200 amps)installed | $1,450installed | $2,400 | $4,350 |
| Monitoring subscription, where chargedper year | $0per year | $120 | $240 |
| Ground mount instead of roof mount (8 kW)extra | $3,800extra | $6,200 | $9,550 |
| Clay or concrete tile roofextra | $950extra | $1,650 | $2,400 |
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Prices verified November 2026 · Cross-referenced against 42+ American pricing sources · See methodology
Figures cover the St. Louis metro area. Jobs in Downtown, Grand Center & the Grove can run higher; simple roofs in St. Charles, Clayton & the suburbs sit closer to the low end.
Solar panel prices across St. Louis
The panels cost the same across St. Louis; the roofs do not. Flat and older roofs in Downtown, Grand Center & the Grove push labor up, and big simple roofs in St. Charles, Clayton & the suburbs keep it down.
Downtown, Grand Center & the Grove
- 8 kW installed
- $18,550–$29,750 installed
- Typical job
- $14,600–$36,150 / 6–10 kW system
Dense blocks with row houses, shared walls and small roofs. Expect fewer panels than the roof size suggests, a crane or extra crew on some jobs, and parking folded into the labor line.
North St. Louis
- 8 kW installed
- $18,050–$28,650 installed
- Typical job
- $14,150–$34,800 / 6–10 kW system
Older roofs and older wiring. The system price is standard; the roof repair, panel work and tree trimming decide the final number.
South City & Dutchtown
- 8 kW installed
- $17,500–$27,550 installed
- Typical job
- $13,750–$33,450 / 6–10 kW system
Middle-of-the-range jobs. Good roof space on most homes; tree shade is the thing to check.
St. Charles, Clayton & the suburbs
- 8 kW installed
- $17,150–$27,550 installed
- Typical job
- $13,500–$33,450 / 6–10 kW system
Big roofs and big bills. Larger systems cost less per kW, and this is where most 10–12 kW jobs in the metro are.
Real solar jobs in St. Louis
Here's what common solar panel jobs cost in St. Louis in 2026, installed, before incentives.
Smaller home: 6 kW, standard panels
About 24 kWh on an average day at Missouri's sun levels. Smaller systems cost more per kW, about $2,800 here against $2,650 for 8 kW.
Typical home: 8 kW, standard panels
About 32 kWh a day and 11,800 kWh a year. $21,350 is the typical St. Louis price for a pitched shingle roof in good shape.
Solar plus a Powerwall 3
An 8 kW system with a 13.5 kWh battery for outages and evening use. Doing both in one job shares the crew, the permit and the utility paperwork.
Big home or EV owner: 10 kW, premium panels
Premium panels make more power per square foot, which helps on small or shaded roofs. Standard panels at 10 kW are $21,250–$33,450.
Re-roof with solar already on it
Taking about 20 panels off and putting them back after the roofers leave, on top of the roof itself. If your roof has less than 10 years left, replace it before solar goes on.
How much do solar panels cost in St. Louis?
An 8 kW system costs $17,500–$27,550 to install in St. Louis; $21,350 is the middle of the market. The low end is standard panels on an easy roof from a local installer. The high end adds premium panels, a hard roof or a big national brand's sales costs.
There is no federal credit to take off these numbers any more. What still cuts the bill in St. Louis is a second or third quote, the right system size for your actual use, and any state or utility program. Figures re-verified against 42 sources in November 2026.
Solar prices in St. Louis (2026): the lines on a quote
An 8 kW system is $17,500–$27,550 installed, a battery adds $8,750–$18,000, and a panel upgrade adds $1,450–$4,350 if your panel is full.
| Line on the quote | Low | Typical | High |
|---|---|---|---|
| 8 kW system, standard panels | $17,500 | $21,350 | $27,550 |
| 8 kW system, premium panels | $19,250 | $24,550 | $34,450 |
| Tesla Powerwall 3, added at install | $11,200 | $14,350 | $18,000 |
| Main panel upgrade (to 200 amps) | $1,450 | $2,400 | $4,350 |
| Tile roof, extra | $950 | $1,650 | $2,400 |
| Ground mount, extra | $3,800 | $6,200 | $9,550 |
| Critter guard | $670 | $1,150 | $1,600 |
| String inverter replacement (later) | $1,450 | $2,250 | $3,400 |
The panels are the most visible line, but not where St. Louis quotes differ most. Compare the inverter type, the warranty, and whether roof work, a panel upgrade and permits are in the price.
What moves a solar quote in St. Louis:
- System size — bigger systems cost less per kW: about $2,800 at 6 kW against $2,600 at 10 kW.
- Panel and inverter brand — premium panels run 10–25% more; microinverters cost more than one string inverter but last longer.
- The roof — tile adds $950–$2,400, a ground mount $3,800–$9,550, and a worn roof should be replaced first.
- The electrical panel — a full or 100-amp panel can add $1,450–$4,350 for an upgrade.
- Who sells it — sales and marketing are about 15% of a typical price; local installers often quote less than national brands.
Ask every St. Louis installer for the same five things: system size in kW, panel and inverter models, the price per kW, the warranty terms, and what roof, panel and permit work is included. Compare those lines, not the total. Get a quote for your solar install →
Solar Panel Cost in St. Louis by System Size
A 6 kW system is $13,750–$21,650, 8 kW is $17,500–$27,550, and 10 kW is $21,250–$33,450, installed with standard panels, before any state or utility incentive.
Worked example: a St. Louis home using about 980 kWh a month gets an 8 kW system at $21,350. If the panel is 100 amps, add an upgrade at $2,400 for $23,750. Add a Powerwall 3 in the same job and the total is about $37,400.
A larger home with central AC or an EV may need 10–12 kW: $25,950 for 10 kW, or $31,950 for 12–13 kW at typical prices. Premium panels on 10 kW run $23,400–$41,850.
St. Louis Solar Panel Costs by System Size
| System size | Cost | Best for |
|---|---|---|
| 4 kW system — about 16 kWh a day | $10,200–$16,050 installed | Small home or condo; low bills or a small roof |
| 6 kW system — about 24 kWh a day | $13,750–$21,650 installed | Smaller home or modest power use |
| 8 kW system — about 32 kWh a day | $17,500–$27,550 installed | Typical home; about 980 kWh a month of use |
| 10 kW system — about 40 kWh a day | $21,250–$33,450 installed | Larger home, central AC or one EV |
| 12 kW system — about 48 kWh a day | $25,300–$39,850 installed | Big home, pool or electric heat |
| 15 kW system — about 60 kWh a day | $30,550–$48,050 installed | Very large all-electric home or two EVs |
| 8 kW solar + 13.5 kWh battery | $28,150–$44,650 installed | Backup in outages and evening use where exports earn little |
| 13.5 kWh battery only (no solar) | $11,200–$18,000 installed | Backup without panels; shaded roofs |
Hardware vs everything else: where a St. Louis solar quote goes
Panels, inverter, racking and wiring are only about 41% of a typical US solar price. On a $21,350 St. Louis job that is roughly $8,750. Sales and marketing take about 15%, design, paperwork and overhead about 20%, installer profit about 16%, and the install labor itself only about 6%.
That is why the payback math matters more than the panel brand. An 8 kW system here makes about 11,800 kWh a year. At Missouri's 2024 average of 11.1 cents a kWh across all customers (EIA; home rates usually run higher), that power is worth about $1,300 a year, a simple payback near 16 years. That assumes your utility credits exports at the full rate; lower export credits stretch it, and higher home rates shorten it.
What's included in a St. Louis solar quote (and what costs extra)
A standard quote covers the panels, inverter, racking, wiring, the install crew, permits, inspection and the utility hookup paperwork. The headline price often leaves out:
- Roof work — repairs, or $950–$2,400 extra for a tile roof
- Panel upgrade — $1,450–$4,350 if your electrical panel is full or 100 amps
- Critter guard — $670–$1,600 to keep birds and squirrels out from under the panels
- A battery — $8,750–$18,000 for 10–13.5 kWh of storage, if you want backup
Get the warranty terms in writing: panel and inverter years, the workmanship warranty, and who fixes roof leaks around the mounts.
What's local
Many St. Louis brick homes have older electrical service that needs an upgrade before solar. Ameren Missouri handles the hookup.
System size
An 8 kW system is $17,500–$27,550. A 6 kW system is $13,750–$21,650 and 10 kW $21,250–$33,450; the price per kW drops as the system grows.
Panels and inverters
Premium panels add 10–25% ($19,250–$34,450 for 8 kW). Microinverters cost more upfront than one string inverter but usually carry 20–25 year warranties; a string inverter often needs replacing once ($1,450–$3,400).
Your roof
Clay or concrete tile adds $950–$2,400, a ground mount $3,800–$9,550. If the roof has less than about 10 years left, re-roof first: removing and reinstalling panels later costs $3,350–$7,650.
Your electrical panel
A full or 100-amp panel is a common surprise. Upgrading to 200 amps adds $1,450–$4,350 in St. Louis, and it is cheapest done with the solar job.
Adding a battery
A 10–13 kWh battery adds $8,750–$16,500, a Tesla Powerwall 3 $11,200–$18,000. Batteries make the most sense where outages are common or exports earn little.
Permits and the utility in St. Louis
Permits and inspections are about 3% of a typical price, and the utility must approve the hookup before you can switch on. Ask who files the paperwork; a good installer does all of it.
- Get three quotes.Same panels, different sales costs. St. Louis quotes for 8 kW run $17,500–$27,550; a second and third bid is the fastest way to find the padding.
- Compare the price per kW.Divide each quote by its size in kW. About $2,200–$2,650 per kW is a good St. Louis price for standard panels; much above $3,450 needs a reason.
- Size it to your bills, not your roof.Use 12 months of bills. A system that makes more than you use only pays off if your utility credits exports well.
- Fix the roof first.Re-roofing under existing panels means paying $3,350–$7,650 to take them off and put them back.
- Bundle the panel and battery work.A panel upgrade ($1,450–$4,350) or a battery done in the same job shares the permit, the inspection and the utility visit.
- Check state and utility help.Ask your utility about rebates and how it credits exports before you sign.
Before you pay a deposit to a St. Louis solar installer, get these in writing:
- System size in kW and the expected output in kWh a year
- Panel and inverter brand and model
- Price per kW and the total before incentives
- Roof work, tile or ground-mount extras, priced as their own lines
- Any panel upgrade, priced as its own line
- Permit, inspection and utility interconnection, and who files them
- Warranties: panels, inverter, workmanship and roof leaks
- Payment schedule, and what happens if the utility hookup is delayed
How much do solar panels cost in St. Louis?
$17,500–$27,550 installed for an 8 kW system, and $21,350 is typical. A 6 kW system is $13,750–$21,650 and 10 kW is $21,250–$33,450, before incentives.
What is the price per kW for solar in St. Louis?
About $2,650 per kW for an 8 kW system with standard panels, within $2,200–$3,450. Smaller systems cost more per kW and larger ones less.
Is there still a federal solar tax credit in St. Louis?
Not for systems you buy. The 30% Residential Clean Energy Credit ended for expenditures made after December 31, 2025, and the IRS treats the expense as made when installation is complete. Lease and PPA companies may still claim a business credit and pass some of it on in their price.
How much does solar with a battery cost in St. Louis?
About $28,150–$44,650 for 8 kW of panels plus a Tesla Powerwall 3. A 10–13 kWh battery from another brand adds $8,750–$16,500 to the solar price.
How long does solar take to pay off in St. Louis?
Roughly 16 years for a typical 8 kW system at Missouri's 2024 average power price from EIA (11.1 cents a kWh across all customers), with every kWh worth the full price. That assumes your utility credits exports at the full rate; lower export credits stretch it, and higher home rates shorten it.
How much power will an 8 kW system make in St. Louis?
About 32 kWh on an average day, or 11,800 kWh a year, based on about 5.0 peak sun hours a day for Missouri in NREL data.
Do I need a new electrical panel for solar in St. Louis?
Not always. Many 200-amp panels take solar as they are. A full or 100-amp panel may need an upgrade, about $1,450–$4,350 here.
What does solar panel cleaning and upkeep cost in St. Louis?
Cleaning is $140–$480 a visit and a health check $140–$330. Many roofs never need cleaning; rain does most of it. Budget $1,450–$3,400 for one string inverter replacement over the life of the system.
How much does it cost to remove solar panels for a new roof in St. Louis?
$3,350–$7,650 to take about 20 panels off and put them back, on top of the roof itself.
What permits does solar need in St. Louis?
A building or electrical permit, an inspection, and the utility's approval to connect. Your installer should file all of it; permits and inspections are about 3% of a typical price.
Prices verified November 2026 · Cross-referenced against 42+ American pricing sources · See methodology
Prices for the St. Louis metro area, November 2026. Outer suburbs may vary.
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