Local research · updated July 2026
Replacement Windows in Charleston, South Carolina
Charleston is really two window markets in one. Metro-wide, the housing stock is newer than its reputation suggests — the median home was built around 1994 and only about 35% predate 1980, reflecting decades of suburban growth in Mount Pleasant and North Charleston. But the peninsula holds some of the oldest and most tightly regulated historic housing in the country, where a Board of Architectural Review governs what you can put in an opening. Layer a hot, humid coastal climate and serious hurricane exposure on top of that split, and the right window in a 1998 Mount Pleasant house looks nothing like what's allowed on a South of Broad single house.
Short answer
In Charleston, a standard replacement window (double-hung, casement or slider) typically costs $565–$3,215 installed. Bay and bow windows run $2,830–$9,045+, and a sliding patio door $1,695–$5,650. Frame material and the glass package decide where a project lands in that range.
Planning ranges built from NREL and BLS cost data, localized to Charleston with the BEA Regional Price Parity for Charleston-North Charleston, SC (2024). How we estimate →
35%
of Charleston homes were built before 1980, the era of single-pane and early aluminum windows
Source: U.S. Census Bureau, 2019–2023 ACS 5-Year Estimates
1994
median year built across Charleston's 75,826 housing units
Source: U.S. Census Bureau, 2019–2023 ACS 5-Year Estimates
SHGC ≤ 0.23
the ENERGY STAR v7.0 number that matters most in the South-Central zone
Source: EPA ENERGY STAR v7.0
Window installers in Charleston
Compare companies serving Charleston. Request a free, no-obligation quote and we route it to the company or a vetted local installer.
| Company | Location | Request a quote |
|---|---|---|
 4.8 · 200,000+ reviews | Summerville, SC | Get a quote → |
| 1NewSouth Window SolutionsNewSouth Window Solutions | Charleston, SC | Get matched → |
| 2Pella Windows and Doors Showroom of Charleston, SCPella | Johns Island, SC | Get matched → |
| 3Window World of the LowcountryWindow World | Ladson, SC | Get matched → |
Renewal by Andersen of Charleston-Hilton Head, SC (446)
4.8 · 200,000+ reviewsSummerville, SC showroom · serving the Charleston metro
Full-service manufacturer and installer, transferable warranty, local crews. Why it's our Top Pick
Get a quote →Listings compiled from manufacturer dealer locators and public business records. Premier and Sponsored Partners pay for placement and are labeled as such; star ratings shown are reported by the partner, with the source and date beside them. See our advertising disclosure. Contacting a company shares your details with it (or a vetted local installer) so it can reach you about your project.
Are you a window company? Claim your listing to take quote requests from Charleston homeowners directly.
What drives window decisions in Charleston
- Two very different jobs: newer suburban stock (median build year around 1994, only ~35% pre-1980) is mostly about cooling efficiency and failed insulated-glass seals, while peninsula historic homes are about matching profiles and getting design approval.
- Hot-humid coastal climate makes solar-heat control the priority — low-SHGC, low-e "sun" glass does more for a Lowcountry cooling bill than a low U-factor aimed at holding heat in.
- Salt air and high humidity are hard on hardware and seals; corrosion-resistant components and quality insulated-glass units matter more here than inland.
- Historic-district homes face a genuine conflict between hurricane impact rating and design approval — the BAR typically will not approve vinyl on historic elevations, so the answer is often wood or clad units matching original profiles, or impact-rated products designed to look historically appropriate.
Replacement windows & doors by type in Charleston
Local cost ranges and South-Central-zone efficiency guidance for each window and door style, specific to Charleston homes:
Ranges localized to Charleston's cost level: national planning ranges shifted by the BEA Regional Price Parity for Charleston-North Charleston, SC (101, U.S. = 100; 2024). How we estimate local costs →
Efficiency requirements for Charleston's climate
Charleston sits in the ENERGY STAR South-Central zone (IECC zone 3A (warm, moist), Charleston County). Under the v7.0 specification, qualifying windows need a U-factor of 0.28 or lower and an SHGC of 0.23 or lower. Cooling-leaning climate: blocking solar heat gain (low SHGC) matters as much as insulation.
Not sure what these numbers mean? Read our plain-English guide to U-factor and SHGC.
What replacement windows cost here
National installed-window ranges are only a starting point in Charleston, because two local factors move the number in opposite directions from a typical suburban job. On the peninsula, BAR-compliant wood or clad windows matching historic profiles — often custom, sometimes with impact rating — cost well above a standard vinyl double-hung, and the design-review timeline adds weeks. In newer Mount Pleasant and North Charleston homes, the job is closer to a standard efficiency retrofit. Wherever the wind-borne-debris code applies, an impact quote and a non-impact quote aren't comparable — impact is the compliant baseline. Get every bid itemized: the exact product and its ratings, whether impact/DP rating is included, and whether the permit (and any Certificate of Appropriateness) is pulled by the contractor. Avoid anyone quoting firm dollars before seeing your openings and confirming your wind zone.
For a breakdown by frame material and install type, see our full cost guide.
Rebates & incentives in South Carolina
The federal window tax credit (25C) ended for projects placed in service after December 31, 2025. If your windows were installed in 2025, you can still claim it on your 2025 return — but for new projects there is no federal window credit. State and utility programs are now the main source of window incentives.
South Carolina's IRA Home Energy Rebates are administered by the South Carolina Energy Office (within the Office of Regulatory Staff); the HOMES and HEAR allocations are approved but, as of mid-2026, the consumer-facing programs had not launched, with the Energy Office still finalizing software and contractor enrollment after repeated delays. Windows generally qualify only through the whole-home HOMES modeled-savings track rather than as a standalone item. Confirm current status with the SC Energy Office before promising rebates.
- Duke Energy Smart $aver window rebate. Duke Energy's residential Smart $aver program offers an energy-efficient window rebate that does reach Duke's South Carolina customers, but only for homes with whole-home electric heating (heat pump, electric furnace, or radiant electric), on complete window replacements with air sealing, capped at 13 windows per home. (Duke Energy Smart $aver (duke-energy.com))
- Dominion Energy South Carolina EnergyWise. Dominion Energy South Carolina's residential EnergyWise program rebates heat pumps, central AC, ductwork, and heat pump water heaters but does not offer a standalone replacement-window rebate; window help is generally limited to its income-qualified weatherization offering. (Dominion Energy South Carolina (dominionenergy.com))
South Carolina's residential energy code has lagged, remaining based on the 2009 IECC with state amendments, so code-minimum window U-factors are dated; Charleston and Columbia permitting runs through local building departments, and the hot-humid IECC zone 3A climate makes solar heat gain coefficient (SHGC) as important as U-factor for replacement windows.
Replacement windows in nearby metros
Not in Charleston proper? These nearby markets carry the same local research: housing-age data, climate-zone specs, and current rebate status for each city:
Charleston window replacement FAQ
›Do I need a permit or design approval to replace windows in Charleston?
Window replacement is permitted through the City of Charleston, and standard building permits apply metro-wide. If your home is in the historic district, there's a second, stricter layer: the Board of Architectural Review (BAR) — one of the oldest and strictest design-review boards in the country — requires a Certificate of Appropriateness before exterior changes visible from the public right-of-way, which includes windows. The BAR reviews materials, profiles, and muntin patterns, and vinyl replacement windows are typically not approved on historic elevations. Budget extra time — full BAR review can add weeks — and confirm current requirements directly with the City before ordering anything.
›What efficiency numbers should Charleston windows hit?
Charleston falls in the ENERGY STAR South-Central climate zone (IECC zone 3A, hot-humid). The version 7.0 targets there are a U-factor of 0.28 or lower and — the one that matters most in a cooling-dominated coastal market — an SHGC (solar heat gain coefficient) of 0.23 or lower. Prioritize low-SHGC, low-e "sun" glass to keep solar heat out; the U-factor still counts for the milder winters, but here it's the secondary metric. Look for the ENERGY STAR label with the South-Central zone qualification and check the NFRC numbers rather than taking a salesperson's word.
›Are there rebates or tax credits for windows in Charleston?
The picture is thin right now. The federal 25C energy-efficient home improvement tax credit expired on December 31, 2025, and South Carolina's IRA-funded HOMES and HEAR rebate programs (run through the SC Energy Office) had not launched, so there's no state window rebate to count on. The most concrete option is Duke Energy's Smart $aver window rebate, which reaches Duke electric-heat homes in South Carolina: it requires a participating contractor, includes air sealing, is limited to whole-home electric heating (heat pump or electric furnace), and caps the number of windows (around 13 per application). Dominion Energy SC's EnergyWise program does not rebate windows. Confirm current terms and your eligibility with the utility directly, since programs change.
›Can I get hurricane-impact windows on a historic Charleston home?
Often yes, but it takes planning, because two requirements pull against each other. In wind-borne-debris zones the building code pushes toward impact-rated glazing, while the Board of Architectural Review protects the historic look and typically won't approve vinyl or units that alter original profiles. The usual path is wood or clad windows that match the historic sightlines and muntin patterns, or impact-rated products specifically engineered to look historically appropriate — approved through a Certificate of Appropriateness. Work with a contractor experienced in BAR submissions, and don't assume an off-the-shelf impact window will clear review; the product and its profiles have to satisfy both the code and the board.
Sources
- — U.S. Census Bureau, American Community Survey 5-Year Estimates (B25034, B25035)
- — EPA ENERGY STAR Version 7.0 Residential Windows specification
- — DOE/PNNL IECC climate zone assignments by county
- — NWS Charleston; South Carolina Building Code (IRC/IBC, ASCE 7)
- — IRS, 25C Energy Efficient Home Improvement Credit (P.L. 119-21)