Local Tennessee Christmas-light installation services typically charge $850–$1,400 per year for a Williamson County home — install in November, take-down in January, plus possible bulb replacements and storage hassle. Over 5 years that’s $4,250–$7,000. Over 10 years: $8,500–$14,000. A one-time Trimlight install ($4,500–$7,500 for most Middle Tennessee homes) typically breaks even at year 4–5 — and from year 5 on, you’re saving thousands while also getting Halloween, Easter, July 4th, Valentine’s, every Titans game day, and 300+ nights of year-round warm-white accent. The math tilts heavily toward permanent installation.