Lewisville occupies a natural gateway position in Denton County — bordered by the lake to the north, Carrollton and Farmers Branch to the south, and the growing communities of Flower Mound and Coppell to the west and east. It is a practical, established suburb with a diverse housing stock and a straightforward solar case: high Texas electricity bills, Oncor service with access to the full rebate and buyback ecosystem, and Denton County property tax savings that run for the life of the system.
Solar Costs in Lewisville TX in 2026
Lewisville homes range from compact 1970s–80s ranches in older central neighborhoods to larger two-stories in the planned communities developed in the 1990s and 2000s. Most residential systems in Lewisville fall between 5 kW and 10 kW.
| System Size | Installed Cost (Before Incentives) | Est. Annual Savings |
|---|---|---|
| 5–6 kW | $16,000 – $21,000 | $1,000 – $1,500 |
| 7–8 kW | $22,000 – $26,000 | $1,400 – $2,000 |
| 9–10 kW | $27,000 – $32,000 | $1,900 – $2,700 |
| 11+ kW | $33,000+ | $2,500+ |
Denton County Property Tax Exemption in Lewisville
Lewisville is in Denton County. The combined property tax rate — Denton County, City of Lewisville, and Lewisville ISD — runs approximately 2.0–2.3%. Under Texas Tax Code §11.27, your solar system's full appraised value is permanently exempt. On a $24,000 system at a 2.1% combined rate, that is $504 per year saved — $12,600 over the system life. Zencore Solar files Form 50-123 with the Denton Central Appraisal District on every Lewisville installation.
Oncor Service in Lewisville
All of Lewisville is served by Oncor Electric Delivery — not the DME municipal utility that covers the City of Denton to the north. As an Oncor customer, Lewisville homeowners have access to the full ERCOT retail market, competitive solar buyback plans, and the Oncor Solar+Storage rebate of up to $9,000 for qualifying battery installations.
Lewisville Neighborhoods and Solar Compatibility
- ✓Older central Lewisville (pre-1985): Smaller homes, may need electrical panel evaluation. Strong candidates for a modest 5–6 kW system that still meaningfully cuts bills.
- ✓Castle Hills and planned communities (1990s–2000s): Large well-oriented rooftops, active HOAs. Texas law protects solar rights; we handle all ARC applications.
- ✓Lakeland Hills and lakeside areas: Some larger, higher-value homes near Lake Lewisville. Strong solar ROI given larger system sizes and higher property values amplifying the tax exemption benefit.
- ✓Newer development near SH-121: More recent construction, newer roofs, often well-oriented for solar production.
What Older Lewisville Homes Need Before Solar
Homes built in the 1970s–80s in central Lewisville may need a few things evaluated before solar installation:
- ✓Roof age and condition: A 20+ year roof may need replacement before or alongside solar installation. We assess roof condition during every free site visit at no charge.
- ✓Electrical panel: 100-amp service common in older homes may need upgrading to 200-amp. We include this in the project estimate if required — typically $900–$1,500.
- ✓Shade from mature trees: Older Lewisville neighborhoods can have significant tree coverage near rooflines. We quantify shade impact and position panels on the best-producing sections.
Solar Permitting in Lewisville
The City of Lewisville Building Inspections handles residential solar permits. Lewisville's permit process is established — complete applications are typically approved within 5–10 business days. We manage all permit documentation, fees, and inspector coordination as part of every installation.
Get a free solar quote for your Lewisville home — system sizing, Denton County tax savings, and Oncor rebate eligibility all reviewed at no cost.
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