Plan for it at first fix and it stays cheap
The cheapest second zone is the one designed before the drywall closed. Three moves cost almost nothing during the first install. Pull a spare pair of low voltage conductors to any area that might be lit next, and leave both ends labeled and coiled. Size the original supply with the future load in the arithmetic rather than the present one. Choose a control device with more outputs than the project currently needs, so the second zone plugs into a spare channel instead of arriving with its own hardware.
Our guide to planning lighting zones from the start works through dividing a space before anything is fixed.
How to add a second lighting zone to a finished install
Start with three measurements rather than a purchase. Measure the intended new run and note the strip you plan to use. Find the existing driver, photograph its label, and record its rated output and voltage. Then work out how the new run gets back to that driver, following the route a cable can take.
Take the power off before opening anything. Line voltage wiring, hardwired drivers, junction boxes, and wall devices belong to a licensed electrician working from the manufacturer instructions, your local code, and NEC requirements where applicable.
If the existing supply is undersized for two zones, a second supply feeding only the new zone is often tidier than replacing a working unit, provided the two are never bridged on the low voltage side.
Does the supply have room for both?
Total the footage of both zones, apply each product's watts per foot to its own length, add the results, then keep at least 20 percent spare current above that sum (verify the headroom advice and the rated output of any supply before you rely on either). If that lands above the driver's rating, the choice is a larger unit or a dedicated one.
Both zones run at their strip's own voltage, 24V tape to a 24V supply and 12V tape to a 12V supply, with nothing crossed. Where a fixed output unit suits, the EnoLED 24V ELD plug in or direct wire supply is one option for a non dimmed zone (verify its rated wattage and mounting version).
Independent control for each zone
Separate control is what makes the second zone worth having, and it needs checking rather than assuming. Whether two zones dim smoothly and quietly across their range depends on the strip, the driver, the controller, the wall device, the protocol, and the load limits of each part, confirmed against each other before anyone promises a result. Test the combination you own.
A multi channel controller also has a current rating per channel as well as a total, so the busier zone can exceed a channel limit while the overall load still looks comfortable (verify both figures for any unit in the LED controller range). And keep a smart low voltage controller off the same circuit as a phase cut wall dimmer unless the documentation for both parts allows the pairing.
Wire each zone back to the supply on its own pair
Every zone returns to the driver or its controller channel on its own conductors, in parallel with the others, never chained one behind the next in series. A second zone tapped off the far end of the first inherits all of the first zone's voltage drop before it even starts.
A long factory lead removes a splice from the new route. The solderless strip to wire connector with a 72 inch lead will often reach from the new strip back to the existing driver bay without a joint (verify the lead length and conductor count against your tape).
