What it costs, what's permitted, and what to ask before you hire.
Last verified: 2026-05-31 · Well-sourced
Incentive snapshot
Section 25C Energy Efficient Home Improvement Credit (windows and skylights)
Expired Dec 31, 2025. For 2023–2025: 30% of product cost, up to $600/yr (sub-cap inside the $1,200 envelope). EXPIRED: This federal credit ended Dec 31, 2025 under the One Big Beautiful Bill Act (Public Law 119-21, signed July 4, 2025). Installations completed in 2026 or later do not qualify, regardless of when payment was made. For installations completed during 2023–2025, the credit applied to a U.S. principal residence owned and used by the taxpayer (renters and second homes were not eligible for this category) and required ENERGY STAR Most Efficient windows or skylights, verified by NFRC Certified Product Directory number against climate-zone requirements. The $600 windows sub-cap sat inside the $1,200 annual envelope. Homeowners with eligible 2025 installations may still claim the credit on their 2025 federal tax return. Verify with a qualified tax professional.
$8,000–$22,000 — Whole-house window replacement cost for a single-family SoCal home (roughly 12–20 windows) using mid-range ENERGY STAR-rated vinyl or fiberglass dual-pane low-E windows, pre-incentive. Range reflects window count, retrofit vs. full-frame replacement, and any abatement on older homes.
As of 2026-05-30, SCE residential electric service runs on time-of-use (TOU) rate plans by default. The standard TOU option is TOU-D-4-9PM (4 PM-9 PM weekday peak window). Alternatives include TOU-D-5-8PM (5 PM-8 PM peak window for households that cannot shift evening load) and TOU-D-PRIME, a rate reserved for customers with an EV, plug-in hybrid, residential battery, or an electric heat pump for space or water heating. TOU-D-PRIME features lower peak rates paired with a higher daily basic charge (about $0.79/day, roughly $24/month). Under California's Net Billing Tariff (NEM 3.0), new residential solar customers in SCE territory must be on TOU-D-PRIME. Legacy tiered and earlier TOU plans (TOU-D-A, TOU-D-B, TOU-D-T) remain available to existing customers but are closed to new enrollment. Households planning heat pump HVAC, EV charging, battery storage, or whole-home electrification may want to compare TOU-D-4-9PM and TOU-D-PRIME; verify current per-kWh rates and plan rules at the provider site before switching.
As of 2026-05-30, LADWP residential electric customers default to rate schedule R-1A (Standard), a three-tier inclining-block structure (Tier 1 / Tier 2 / Tier 3). During summer high-demand months all three tiers price separately; in winter Tiers 2 and 3 are billed at the same rate. LADWP divides the City into two temperature zones (Zone 1 cooler, Zone 2 hotter inland) and gives Zone 2 a larger Tier 1 allowance. Bills also include a monthly Power Access Charge (PAC) that scales with the customer's highest energy use over the prior year. A time-of-use option, R-1B (TOU), is available on request. Important: LADWP is a municipal utility owned by the City of Los Angeles and is NOT regulated by the California Public Utilities Commission (CPUC); rates are set by the LA Board of Water and Power Commissioners. LADWP operates its own net-metering tariff (system cap 1 MW) and is NOT subject to CPUC's NEM 3.0 / Net Billing Tariff (NBT), which governs only the investor-owned utilities PG&E, SCE, and SDG&E. Homeowners should verify current rates on the LADWP residential rates page before sizing a project; LADWP filed rate increases for 2026.