Decks · Service

Deck lighting, run before the boards go down

The cheapest hour to wire a deck is the hour before it gets a surface. We match you with vetted local pros and cover what has to be rated for outdoors, what needs an electrician, and what needs deciding now rather than later.

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In short

What is deck lighting installation?

Deck lighting covers stair and step lights, post cap and rail lights, recessed floor lights and under-rail strips. Most residential deck lighting is low-voltage, run from a transformer, which is why it is comparatively approachable. The one decision with a deadline attached is where the cable runs: routing it through the frame is easy while the frame is open and awkward to impossible once the surface is fixed down.

Triggers

Signs you need deck lighting installation

The stairs are genuinely hard to see after dark and someone in the house has already misjudged a step
You are building, replacing or resurfacing a deck, and the frame is currently open
The only outdoor light on that side of the house is a floodlight that either blinds people or is off
Existing deck lights have failed, corroded at the fittings, or fill with water
You use the deck in the evening for most of the year and currently rely on portable lights and extension leads
A run of extension cable crosses the deck to power anything out there

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The job

How deck lighting installation actually works

Decide the layout while the deck is still a drawing

Which steps, which posts, which edges. The useful principle is to light the surfaces people walk on and the changes in level, not to light the deck as an object. Uplighting the whole thing looks good in a photograph and produces glare when you are sitting on it.

Watch for: Being sold a fixture count rather than a lighting plan. More fittings is not the same as being able to see the steps.
Run the cable while the frame is open

Cable routed through the joists and posts before decking goes on is invisible, protected and quick. After the boards are down, the same runs mean lifting the surface or surface-mounting the cable where it can be seen and damaged.

Watch for: A builder who says lighting can be added later. It can, but not at this price, and it is worth at least running spare cable now even if the fittings come later.
Low-voltage or line-voltage

Low-voltage systems run from a transformer and are the norm for step, post and rail lighting. Line-voltage is for larger fixtures, outlets and anything on a switch loop from the house — and it is licensed electrical work in most jurisdictions, with requirements for wet locations and for ground-fault protection.

Watch for: Line-voltage work being done by whoever happens to be on site. Outdoor circuits have specific requirements and this is not the place to find out yours were not met.
Fittings and transformer sized together

The transformer has to cover the total load with headroom, and cable runs that are long or thin lose voltage, which shows up as fittings at the far end being dimmer than the ones near the transformer. Every part touching the outside — fittings, connectors, the transformer housing — needs to be rated for wet locations.

Watch for: Indoor-rated connectors used outdoors because they were to hand. They corrode, they fail intermittently, and the fault is buried inside a deck.
Control and commissioning

A timer, photocell or smart control decides when it comes on. Once it is live, look at it after dark from where you will actually sit and from your neighbour's side of the fence — the difference between good deck lighting and bad deck lighting is almost entirely about glare.

Watch for: Fittings aimed into eye line. Once they are set into a post or a riser, redirecting them is not a small change.

Money

What does deck lighting installation cost?

A modest low-voltage scheme — stair lights and a few post lights with a transformer — commonly runs a few hundred to a couple of thousand dollars installed. Line-voltage circuits, outlets or an extensive scheme cost considerably more, largely because a licensed electrician is involved.

See the full deck lighting installation cost guide — by material, size and region →

Straight answer

When deck lighting installation is the wrong call

Everyone else ranking for this is paid when you say yes. Here's when you shouldn't.

The deck is having structural work done and lighting has not been designed in yet. Wait a week and do it while the frame is open. Installing now and lifting boards later doubles the labour for nothing.
You are trying to make dark stairs safe with lighting alone. Lighting helps, but a stair that is dangerous in daylight because of uneven steps is a geometry problem, and illuminating it does not fix it.
The deck itself is near the end of its life. Fittings set into posts and risers do not transfer to a new deck. Spend it when you rebuild.
You want the whole deck lit brightly. Bright, evenly lit outdoor space is unpleasant to sit in and reliably annoys neighbours. If that is the brief, portable lighting you can turn off is a better purchase than something wired in permanently.
Nobody has mentioned wet-location ratings or ground-fault protection. On any line-voltage element that is a red flag about who is doing the work, not a detail to sort out later.

Straight answer

Can I do this myself?

Low-voltage deck lighting is genuinely homeowner-approachable. Anything at line voltage outdoors is not — outdoor circuits have wet-location and ground-fault requirements that exist because the combination of water, metal and bare feet is exactly how people are electrocuted at home.

Reasonable to DIY

Planning where the light needs to be, which is the part most often done badly by professionals
Fitting plug-in or solar step and post lights on an existing deck
Installing a low-voltage kit where the transformer plugs into an existing exterior outlet, following the manufacturer instructions

Call a licensed pro

Any new line-voltage circuit, outlet or switch
Anything requiring a new exterior outlet to plug the transformer into
Cable runs through structural framing during a build
Sizing a transformer and cable runs for a scheme of any size

Before you sign

What to check when hiring for deck lighting installation

Can this be wired before the decking goes down?

The single scheduling question that decides the price. If the deck is being built or resurfaced, this is the window.
Is any of this line voltage, and if so who is the licensed electrician?

Outdoor line-voltage work has specific requirements and should be done by someone qualified and insured for it.
Are the fittings, connectors and transformer all rated for wet locations?

Connectors are the usual weak point, and they get buried where you cannot inspect them.
How is the transformer sized, and is there headroom to add fittings later?

A transformer with no spare capacity means the next light costs a transformer.
Where does the transformer live and how is it powered?

It needs an outdoor-rated location and a supply. If there is no exterior outlet, that is an electrician's job and a separate line.
Can I see the scheme lit before we settle up?

Glare is only assessable after dark, from a seat. Fittings set into posts are not easy to re-aim later.

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Local pros

Deck Lighting Installation near you

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Related work

Often done at the same time

Deck Stairs Installation

The place lighting matters most

Deck Railing Installation

Post and rail fittings mount here

Deck Installation

Design the wiring in during the build

Deck Resurfacing

The other moment the frame is open

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FAQ

Deck Lighting Installation — questions people ask

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When should deck lighting be installed?

During the deck build or a resurfacing, while the frame is open. Cable routed through joists and posts at that stage is quick, hidden and protected. Once the boards are fixed down, the same runs mean lifting the surface or surface-mounting cable where it is visible and vulnerable. If the budget will not stretch to fittings now, it is still worth paying to run spare cable while the deck is open — it is a small line at that moment and a large one afterwards.

Is deck lighting low voltage or mains?

Most of it is low voltage. Step lights, post cap lights, rail lights and recessed floor lights typically run from a transformer that itself plugs into a mains outlet, which keeps the wiring in and around the deck at a voltage that is far more forgiving. Anything larger — a wall light, an outlet on the deck, a switched circuit from the house — is line voltage, and in most jurisdictions that is licensed electrical work with specific wet-location and ground-fault requirements.

Do I need a permit for deck lighting?

For a plug-in low-voltage system, usually not. For any new line-voltage circuit, outlet or switch, generally yes — and it varies by jurisdiction. The practical test is whether new mains wiring is being installed. If a contractor is proposing to add an exterior outlet to power your transformer, that is the part with the permit and inspection attached, and it should be quoted as electrical work rather than folded into a lighting price.

Why are the lights at the far end of my deck dimmer?

Almost always voltage drop. Low-voltage cable loses voltage over distance, and the loss is worse on long runs and thinner cable, so fittings furthest from the transformer receive less than the ones nearest it. It is a design problem rather than a fault: it is solved by heavier cable, by splitting the scheme into multiple runs from the transformer, or by feeding a long run from both ends. Retrofitting the fix means getting back to the cable, which is why the layout is worth getting right first time.

Are stair lights required by code?

It depends on where you are. Some jurisdictions require illumination at exterior stairs serving a dwelling, and the requirement can differ between a deck stair and a main entrance. It is worth asking your building department rather than assuming either way. Regardless of what is required, stair lighting is the part of a deck lighting scheme that does actual work — it is where people misjudge a step, and it is the one place the fittings earn their cost.