Deck lighting in Danville, KY comes down to one choice first — low-voltage or line-voltage — and that choice decides your permit, your installer, and half your budget before you even pick a fixture.
Should I choose low-voltage or line-voltage deck lighting?
Low-voltage (12V) lighting is safer, cheaper to install, and generally permit-exempt, while line-voltage (120V) lighting needs a licensed electrician and GFCI-protected circuits under the National Electrical Code.
Most of the deck lighting we install — post cap lights, stair tread lights, under-rail strip lighting — runs on a low-voltage transformer plugged into a GFCI-protected outdoor outlet. It’s a DIY-friendly system in terms of running the wire, though we still handle it on new builds so the wiring is hidden inside the framing instead of stapled along the surface. Line-voltage fixtures (a true post lantern wired into house power, for example) need a licensed electrician, a dedicated GFCI circuit, and — for anything direct-buried rather than run in conduit — burial at least 24 inches deep.
What lighting options actually work on a deck?
- Post cap lights — the most common, simplest to add to existing railing posts
- Stair tread lights — a real safety upgrade, not just a look, on any run of deck stairs
- Under-rail or under-bench strip lighting — ambient light without visible fixtures
- Recessed decking lights — set into the deck surface itself, best planned before the boards go down
What does deck lighting cost to add?
A basic low-voltage post cap and stair light package typically runs $500-$1,500 installed, labeled as typical and depending on fixture count and whether wiring is run during a new build or retrofitted into an existing deck. Retrofitting costs more since wire has to be fished through or run along the existing structure rather than hidden during framing — planning it into a new deck build from the start keeps it on the low end.
Common questions
Do I need a permit for deck lighting?
Low-voltage (12V) systems are generally permit-exempt. Line-voltage fixtures wired into house power typically do require a permit and a licensed electrician — check with Boyle County before starting.
Does deck lighting need GFCI protection?
The low-voltage side of a transformer isn’t subject to GFCI rules, but the outdoor outlet the transformer plugs into must be GFCI-protected. Line-voltage outdoor lighting circuits require GFCI protection directly.
Can I add lighting to an existing deck?
Yes, though the wire has to be run along or fished through the existing structure rather than hidden during framing, which is why it costs more than planning it into a new build.
Kentucky’s electrical code follows the National Electrical Code as adopted by the Kentucky Department of Housing, Buildings and Construction; confirm current local requirements with Boyle County before wiring anything into house power. For the railing posts that most cap lights mount to, see our railing installation page.
Planning lighting into a new deck or want to add it to an existing one? Call or text (859) 310-1209.
Last updated: September 4, 2026