How to Plan Landscape Lighting: Steps in the Right Order

Sketch the yard, rank what each light is for, and measure your cable runs before you shop for a single fixture. Wire length drives transformer size and voltage drop, and those two numbers limit which fixtures you can run. Buy fixtures first and you often end up buying a second transformer or digging a trench twice.

What Should I Plan Before Choosing Fixtures?

Write down what each light is for and sketch the yard to scale before you open a fixture catalog, because fixture choices only make sense once the jobs are defined.

Walk the property at dusk with a flashlight. Most lights do one of four jobs: safety (steps, path turns, grade changes), security (entries and dark side yards), feature (specimen trees, house walls), or use (patio, grill, deck). Rank them. For a first phase we'd pick safety and entries, then add feature lighting later, since a lit step prevents a fall and a lit maple does not.

Draw the yard on graph paper at one square per 5 feet, or mark up a printed survey. Note the house, outdoor outlets, spigots, beds, trees, and anything you plan to build. If a patio, wall, or walkway is coming, lay spare conduit under it now; the fall hardscaping checklist covers what to finish before the ground freezes. If you're adding trees, settle their final positions first so you aim uplights at where the trunks will be, and read about the fall tree planting mistakes that quietly kill young trees before you dig.

Should I Use Low Voltage or Line Voltage?

Choose low voltage for most residential yards and bring in a licensed electrician for anything that runs at 120 volts.

A low voltage landscape lighting system steps household power down to 12 volts through a transformer. The shock risk is low, the cable can be buried shallow, and a patient homeowner can install it. Line voltage runs at the full 120 volts and suits big floodlights, pole lights, and long feeds to a detached garage. It needs conduit or deeper burial, and in most places a permit and inspection.

The catch for DIYers is the power source. If you don't have a GFCI outlet near where the transformer will go, adding one is electrical work. Hire a licensed electrician for that part, and for any hardwired transformer connection, even if you do the rest yourself.

How Do I Count Wire Runs and Size the Transformer?

Add up the wattage of every fixture, keep that total at about 80 percent of the transformer's rating, then check that no cable run is long enough to dim the last light.

List each fixture and its wattage. LED path lights often draw 1 to 4 watts, while LED uplights commonly run 3 to 12 watts, so check the box. Say you plan 20 fixtures at 4 watts each. That's 80 watts, and dividing by 0.8 points to a 100-watt minimum. A 150-watt landscape lighting transformer leaves room to add lights later. On larger yards, a multi-tap transformer with several voltage outputs helps you compensate for long runs.

Then measure each run from the transformer to the farthest fixture. Voltage drop happens because 12-volt systems lose power over distance and with heavier loads, so fixtures at the end of a long, overloaded run look noticeably dimmer. Many manufacturers specify roughly 10.5 to 12 volts at every fixture, and their run-length charts beat any rule of thumb. As a rough guide:

Lay the system out as a hub with several shorter legs rather than one long daisy chain. Split the yard into zones on separate transformer terminals, such as front walk, back patio, and garden beds, so you can time or dim each one. One bad connection then won't darken the whole yard. A built-in photocell timer switches the lights on at dusk without any help from you.

What Permits, Codes, and Utility Locates Do I Need?

Low voltage systems often need no permit, but the outlet feed and any 120-volt work usually do, so call your local building department before you finalize the plan.

Requirements vary by city and county, and some HOAs add rules about fixture brightness or visibility. Ask three things: whether low voltage needs a permit, whether new outlets or line voltage circuits do, and what burial depth they enforce.

On depth, the National Electrical Code generally allows low voltage landscape cable to be buried about 6 inches deep. Line voltage circuits go deeper, commonly 12 to 24 inches depending on whether you use conduit or direct burial cable, the circuit type, and local amendments. Treat those as starting points. Your local code and the manufacturer's instructions decide how deep the wire goes in your yard. Outdoor receptacles should be GFCI protected with a weatherproof in-use cover, and inspectors often check that first.

Before you dig any trench, call 811. It's free, and utility owners mark buried lines, usually within a few business days, though timing differs by state. The 811 Call Before You Dig site has the steps.

What Does Landscape Lighting Cost by Zone?

Landscape lighting typically costs $600 to $1,500 for a DIY system and $3,000 to $8,000 installed for an average yard, with fixture count and material the biggest drivers.

Budget zone by zone so you can finish the priority areas first and add the rest later. These are typical U.S. ranges per fixture. The transformer ($100 to $500, depending on size and features), cable, and connectors are extra.

Several things move these numbers: brass or copper versus aluminum or plastic, built-in LEDs versus replaceable bulbs, trenching through rock, clay, or tree roots, and smart controls. Add 10 to 15 percent for surprises like a longer run or an extra outlet. Solid brass fixtures cost more up front and tend to outlast the cheapest plastic kits, so we'd spend extra on fixtures you can't easily reach later.

How Long Does a Landscape Lighting Project Take?

Plan on 2 to 8 weeks from first sketch to final adjustments, though the install itself usually takes only 1 to 3 days for a typical yard.

Autumn is a good time to plan because dark comes early and you can judge the results after work. In cold climates, aim to finish before the ground freezes. After install, go out after dark, adjust the aim, and shade any glare. Check again in a few weeks, once mulch and soil settle and you've seen how plants grow into the beams.

How Do I Hire a Landscape Lighting Installer?

Hire a landscape lighting installer who will put fixture counts, wire gauge, transformer rating, controls, and warranty in writing, so you can compare bids line by line.

Ask whether they hold an electrical license, since line voltage work and new outlets need one in most places and licensing rules vary by state. Ask who pulls the permit, request proof of insurance, and ask to see a finished job at night. Good installers talk about voltage drop and zones without prompting.

Put these in every bid you request:

• Number and type of fixtures per zone, with brand and material
• Transformer wattage and the planned load
• Cable gauge and approximate run lengths
• Controls such as a photocell timer or smart app
• Permit and inspection responsibility
• Warranty on fixtures, LEDs, and labor, plus who handles repairs
• Cleanup, trench restoration, and a follow-up night adjustment

A lump sum with no fixture list is a red flag. So is a bid far below the others, since it often means a smaller transformer, thinner wire, or lower-grade fixtures.

Your next step: do the dusk walk this week, sketch the yard with outlets and planned changes, and call your building department with three questions about permits, burial depth, and GFCI rules. Those answers shape everything else.