How to Extend Your Router's Wi-Fi Range

Dead zones aren't all fixed the same way. Mesh, extenders and powerline adapters solve the problem differently — and picking the wrong one wastes money. Here's how to choose.

Option 1: Wifi extenders/repeaters

A wifi extender picks up your existing router's signal and rebroadcasts it further into your home. They're the cheapest fix — often under $100 for a basic single unit — and need no wiring, just a power socket within range of your existing wifi. The downside: extenders typically create a second network name (unless it's a newer "seamless" model), your devices don't automatically switch to the strongest signal, and speed usually drops by close to half compared to a directly-connected device, because the extender is relaying the same data twice over the same radio band.

Best for: a single small dead zone (like a garage or one back bedroom) in an otherwise well-covered home, where you don't want to spend on a full mesh system.

Option 2: Mesh wifi systems

Mesh systems use multiple matched nodes that all share one network name and intelligently hand your device off between them as you move through the house. TP-Link Deco mesh kits are widely stocked in NZ — Noel Leeming lists entry Deco X10 Wi-Fi 6 2-packs, with more advanced Deco models scaling up in price from there — and Google Nest Wifi and Spark's own Smart Mesh are common alternatives. Because mesh nodes talk to each other over a dedicated backhaul (sometimes their own separate radio band, sometimes ethernet), you don't get the speed penalty that basic extenders have, and coverage tends to be much more even throughout a house.

Best for: multi-storey homes, houses with thick or concrete walls, or anywhere with more than one persistent dead zone.

Option 3: Powerline adapters

Powerline adapters send your network signal through your home's existing electrical wiring instead of wifi. You plug one unit into a wall socket near your router (connected via ethernet cable) and a second unit into a socket in the dead zone, which can then either plug into a device directly or broadcast its own small wifi signal. TP-Link's AV600 Powerline Adapter with AC Pass-Through Starter Kit retails around NZ$159 at Noel Leeming, and higher-spec AV1300 gigabit kits cost more.

Best for: rooms where wifi signal genuinely can't penetrate (basements, garages, sleepout buildings on the same electrical circuit) and running an ethernet cable isn't practical. The catch: performance depends heavily on your home's wiring age and quality, and powerline adapters generally shouldn't be used across separate circuit breakers or between a house and a detached sleepout on its own submeter, since the signal often won't carry reliably.

Which should you actually buy?

• One small dead zone, tight budget: A single wifi extender.
• Whole-house even coverage, multi-storey or brick/concrete construction: A 2-3 node mesh kit.
• A detached garage, sleepout or basement with poor wifi penetration but working household wiring: Powerline adapters.

Whichever you choose, keep your ISP-supplied router's wifi radios in mind — see our mesh network setup guide for how to avoid two networks fighting each other when adding mesh gear to a Spark, One NZ or 2degrees fibre connection.