Deck Lighting and Deck Accessories

The deck accessories that make the biggest difference are the ones you can’t add easily later: lighting wired in before the boards go down, and the hardware that ties the deck to the house. WBC carries a Trex LightHub low-voltage lighting system, from the transformer to the LED riser lights and every connector in between, and a four-piece deck tension tie kit. Plan both while the frame is open.

How a low-voltage deck lighting system goes together

Most low-voltage deck lighting runs on a transformer that plugs into an outdoor GFCI outlet and steps household power down to low voltage. From there it’s plug-and-play: the transformer feeds a splitter, the splitter sends power down several extension wires, and each wire ends at a light. No splicing, as long as every piece belongs to the same system.

WBC part	What it does
8.3-amp transformer	Powers the whole system from a GFCI outlet
Trex LightHub 6-way splitter (4 per bag)	Connects several lights to one power run; count its ports when you plan
LightHub 10-foot male extension wire (4 per bag)	Carries power to a light 10 feet out
LightHub 20-foot male extension wire (4 per bag)	Carries power to a light 20 feet out
White LED riser lights (4 per bag)	Light the stair risers so every step shows

Keep it all in one system. Plug-and-play parts only connect to parts made for them, and a light fed the wrong kind of power (AC where it needs DC, or the other way around) can fail and lose its warranty.

Plan the layout before you buy

Start where the power is: find the outdoor outlet the transformer will plug into, and make sure it has an in-use weatherproof cover. Don’t run an extension cord from the outlet to the transformer, and if you’d rather hardwire a transformer, check your local permit rules first; one deck-lighting guide says it takes an electrical permit.

Then put the light where it matters most. Stairs get the strongest light, because seeing the change in level is the safety job; the riser lights do that. The sitting area wants softer light. Before you fasten anything, connect a few lights temporarily and look at them after dark, giving your eyes 10 to 15 minutes to adjust, so you don’t end up lighting the deck like a parking lot.

Size the transformer to the load. Add up the wattage of every light, then add 10 percent for line loss. An overloaded transformer fails early and makes the lights perform poorly.

Run the wire right

The best time to wire deck lights is before the decking goes on, while you can reach every joist. Route the wires under the frame and through hollow parts where they’re out of sight, and fasten them with cable-safe staples or plastic wire clips. Leave a little slack under each one. Never use T50 staples on lighting wire; a metal staple can pierce the insulation and short the circuit. And never pinch a wire between a deck board and the framing.

In Montana, the frame and the wiring under a deck spend the winter under snow and the spring in snowmelt, so tuck the wires up where water drains away from them and keep every plug-in connection off the ground.

Deck tension tie kit: tie the deck to the house

A deck that pulls away from the house is a deck that fails. Lateral tension ties connect the deck’s joists through the band to the house framing so the deck can’t pull loose sideways. WBC’s four-piece deck tension tie kit is for that connection.

Kits of this kind are built as a complete connection. FastenMaster’s Lateral Tension System, for example, covers five common code-conforming connections, threads 3 inches into the house’s sill plate without going inside the house, and carries an evaluation report (ER-0447). Simpson’s tension ties are rated by load: 750 pounds for the DTT1 and 1,500 pounds for the DTT2. Whichever your plan calls for, the kit belongs in the connection design from the start, with fasteners rated for pressure-treated lumber, and your local building department may require it.

While the boards are up

If you’re resurfacing, look at the frame before the new boards cover it again. Worn decking can hide joists that need attention, and joist tape over the tops of the joists keeps water off them. Treated lumber within 6 inches of the ground needs a ground-contact rating. That’s also the moment to run the lighting wire.

The Pick

Buy the Trex LightHub system as one set: the 8.3-amp transformer, the 6-way splitter, 10- and 20-foot extension wires to reach each light, and the white LED riser lights for every stair. Size the transformer at the lights’ total wattage plus 10 percent. For the deck-to-house connection, put the four-piece deck tension tie kit in the plan and install it while the frame is open.

Frequently Asked Questions

How do you wire deck lights?

Plug a low-voltage transformer into a GFCI outlet with a weatherproof cover, then run plug-and-play extension wires and splitters from it to each light. Route the wire under the deck frame, fasten it with cable-safe staples or plastic clips, and never pinch it between boards and framing. Wiring before the decking goes on is far easier.

What size transformer do I need for deck lights?

Add up the wattage of all the lights on the system and add 10 percent for line loss. An overloaded transformer can fail early and make the lights perform poorly, so leave headroom if you plan to add lights later.

Where should deck lights go?

Put the strongest light on the stairs, where riser lights show every step. Use softer light around the sitting area. Test the layout after dark with a few lights connected temporarily before fastening anything.

What is a deck tension tie for?

It ties the deck’s framing to the house framing so the deck can’t pull away sideways. Tension tie kits are part of the deck’s connection design, rated by load, and your building department may require them. Install them while the frame is open.

Can I mix deck lights from different brands?

Not on a plug-and-play system. Its splitters, wires and lights only connect to parts made for them, and feeding a light the wrong power type can make it fail. Keep the transformer, splitters, wires and lights in one system.