Deck Lighting Calculator
Count the posts and steps, choose a fixture, and get the fixture total, the load on the transformer and an installed cost range.
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Estimated cost
$670 – $1,520
Typical figure around $1,095.
- Fixtures
- 10 lights
- Connected load
- 50 W
- Transformer
- 60 W minimum
Installed prices including the transformer, low-voltage cable and labour, assuming a GFCI outlet within reach. A new circuit adds $150–$400.
Planning estimate only — confirm quantities with your supplier or contractor before ordering.
How this estimate is calculated
The estimate is built from deck posts (posts), step lights (lights) and fixture type, then priced at national average rates. It reports fixtures, connected load and transformer, with quantities rounded up so you are never short of material and the standard waste allowance already included where it applies.
Installed prices including the transformer, low-voltage cable and labour, assuming a GFCI outlet within reach. A new circuit adds $150–$400.
The dollar range is a national average, so treat it as a starting point rather than a bid. Labor rates, permit fees and material delivery differ by region — the state table below shows how your state compares, and construction cost by state breaks the picture down further.
Prefer the longer version? Read our guide to How much does deck lighting cost.
Cost by fixture type
Each row prices the same default job shown in the calculator above, changing only the fixture type. Use it to see what the upgrade or the cheaper option really costs before you commit.
| Fixture type | Low | High |
|---|---|---|
| Post cap light | $670 | $1,520 |
| Recessed step light | $770 | $1,720 |
| Riser or hardscape light | $720 | $1,670 |
| String lights on posts | $570 | $1,320 |
What the same job costs by state
Every row applies that state's construction cost index to the national range calculated above. The index bundles local labor rates, permit fees and material delivery, so it is a planning figure rather than a bid.
| State | Index | Low | High |
|---|---|---|---|
| Ohio | 0.92 | $616 | $1,398 |
| Texas | 0.93 | $623 | $1,414 |
| North Carolina | 0.94 | $630 | $1,429 |
| Georgia | 0.95 | $637 | $1,444 |
| Arizona | 1.01 | $677 | $1,535 |
| Florida | 1.02 | $683 | $1,550 |
| Pennsylvania | 1.03 | $690 | $1,566 |
| Illinois | 1.05 | $704 | $1,596 |
| Colorado | 1.08 | $724 | $1,642 |
| Washington | 1.15 | $770 | $1,748 |
| California | 1.32 | $884 | $2,006 |
| New York | 1.42 | $951 | $2,158 |
Index 1.00 is the national average. See construction cost by state for metro-level figures and the projects homeowners ask about most.
Frequently asked questions
How much does deck lighting cost?
Low-voltage deck lights run $45 to $130 per fixture installed. A typical 10-light layout lands between $700 and $1,500 including the transformer and cable.
How many lights do I need on a deck?
One light per post is the usual starting point, plus one per two or three steps. The goal is to light the walking surface, not to illuminate the garden — more fixtures on a smaller transformer beats fewer bright ones.
What size transformer do I need?
Add the wattage of every fixture and keep the total at about 80 percent of the transformer rating. Ten 5-watt lights need a 60-watt transformer; twenty need 120 watts.
Can I install low-voltage deck lighting myself?
Low-voltage systems are within reach of a careful DIYer: the cable clips to the deck frame and the transformer plugs into a GFCI outlet. The parts that go wrong are waterproofing the connections and sizing the transformer, not the wiring itself.
Does this cost change from state to state?
Yes. Applying each state's construction cost index to the national range of $670 to $1,520, the same job runs from about $616 to $1,398 in Ohio (index 0.92) to $951 to $2,158 in New York (index 1.42).
What is not included in this estimate?
Installed prices including the transformer, low-voltage cable and labour, assuming a GFCI outlet within reach. A new circuit adds $150–$400. The figure is a national planning average for the work described above, not a contractor's quote.
