Electrical and Data Wiring Design for New Homes in Tasmania

Electrical and data decisions made during design are inexpensive. The same decisions made after the walls are closed cost multiples more. Getting your power, lighting, data, and future-proofing wiring right during the planning phase of a new home in Tasmania is one of the highest-return investments in the build process.

Why Electrical Design Matters Before Construction

Electrical rough-in happens early in the build — after framing and before lining. Once the plasterboard goes on, changing electrical layout means cutting walls, patching, repainting, and significantly inflated costs. A decision that takes 15 minutes on a plan review can take 3 hours and $400–$800+ in labour once the house is lined.

Beyond avoiding costly changes, good electrical design has a direct effect on how the finished home feels and functions. Inadequate power points, poorly positioned light switches, missing data infrastructure, and no capacity for EV charging or solar are the most common things new home owners wish they'd addressed during design. Unlike paint colours or tapware, these are genuinely difficult and expensive to fix after handover.

Power Points: Quantity and Placement

The single most consistent piece of feedback from people who've built before is: more power points. Modern households run more devices than ever — and the devices that aren't yet in your life (robot vacuums, air fryers, standing desks, home gym equipment) will need power points too.

For each room, work through where you'll actually place furniture, how you'll use the space, and what needs power. Key placement considerations:

• Kitchen: Above-bench points for appliances (both sides of the sink, near the cooktop, and dedicated points for microwave, coffee machine, toaster); below-bench points inside cabinetry for integrated appliances; a point inside the pantry for a second fridge or chest freezer.
• Living areas: Multiple points per wall (not just one per corner), positioned so furniture can go against any wall without visible cord runs; a media point cluster (power, HDMI, data, aerial) centred on the TV wall; a floor point if the layout allows a central seating arrangement.
• Bedrooms: Both sides of where the bed will go, plus points on the other walls; a USB-A or USB-C combo point at bedside height to avoid adaptor clutter.
• Home office: At least 6 points at desk height on the primary work wall; a data point; a point for a printer; points behind where monitor arms or equipment racks will sit.
• Garage: Multiple points at bench height and floor level; a 15A point for workshop tools or a compressor; a dedicated circuit for an EV charger if relevant.
• External: A weatherproof point at the front entry, rear entertaining area, and beside any outbuilding; a high point on the eave line for Christmas lighting or security cameras.

Lighting Circuit Design

How your lights are circuited determines what you can control and how. A single lighting circuit per room means every light in that room operates on a single switch — fine for a bedroom, less ideal for an open-plan living, dining, and kitchen area where you want the ability to light the kitchen separately from the dining zone.

Consider separate circuits (or at minimum, separate switch circuits) for:

• General ambient lighting, task lighting (under-bench, pendants over islands), and feature or accent lighting in open-plan areas
• Outdoor entertaining separately from indoor (so you can light the deck without illuminating the whole house)
• Path and garden lighting on a timer-capable circuit
• Any zone you want to control independently — including from a smart switch or home automation system

For smart lighting control — whether a full home automation system or just smart switches in key areas — confirm the switch type with your electrician before rough-in. Smart switches typically require a neutral wire in the switch loop, which changes the wiring method compared to standard switches. In Tasmania, all wiring must comply with AS/NZS 3000 (the Wiring Rules), and smart switching installations must use equipment listed for use in Australia.

Data and Network Infrastructure

Wi-Fi coverage is convenient but not reliable for everything that matters. Streaming 4K video, video conferencing, home security systems, and smart home controllers all benefit from or require a wired data connection. Planning your data infrastructure during the build is significantly cheaper than retrofitting conduit and cable afterwards.

Key data design decisions:

• Cable standard: Run Cat 6A rather than Cat 6 where possible — it supports 10 Gigabit speeds and handles PoE+ (Power over Ethernet) for cameras, access points, and VoIP phones without the heat issues that affect Cat 6 at high loads. The cable cost difference is modest; the labour cost of replacement is significant.
• Network distribution point: Locate the main patch panel and network switch in a rack or cabinet in a central position — ideally a dedicated comms cupboard, laundry wall cabinet, or hallway space. This is where your NBN connection terminates, your router and switch live, and where all cable runs star back to. Size the cabinet for what you have now plus what you might add in five years.
• Points per room: At minimum, a double data point (two Cat 6A ports) in every room that might be used as a bedroom, office, or lounge. Living areas benefit from four data ports near the TV wall (TV, streaming box, game console, and a spare) plus a ceiling point for an access point if you're running a managed Wi-Fi system.
• Ceiling access points: If you're using a mesh or managed Wi-Fi system with ceiling-mounted access points (Ubiquiti, TP-Link Omada, Netgear Orbi Pro), run a Cat 6A homerun to each access point location with power via PoE — no power point needed at the ceiling, and performance is substantially better than powerline or Wi-Fi mesh.

In northern Tasmania, most properties can now access fibre-to-the-premises (FTTP) NBN, particularly in newer estates in Devonport, Launceston, Burnie, and surrounding areas. Confirm the available NBN technology type for your address with your provider — it affects the NBN connection box location and what internal networking equipment you'll need.

Future-Proofing: EV Charging and Solar Preparation

Even if you're not planning to install an EV charger or solar system at construction, conduit and a dedicated circuit run during the build costs a fraction of the retrofit cost.

For EV charging preparation:

• A dedicated 32A circuit run from the switchboard to the garage (3-phase is preferred for faster Level 2 charging; single-phase 32A is adequate for most home use)
• Conduit from the switchboard to a weatherproof termination point on the garage wall where the charger will mount
• The switchboard sized with capacity to add the EV circuit breaker without a full upgrade — confirm with your electrician during design

For solar PV preparation:

• Conduit from the roof space (where panel DC cabling will run) to the switchboard location — typically 25mm or 32mm conduit via the most direct path
• A switchboard with sufficient spare positions for a solar inverter isolator and, if applicable, a battery system isolator
• If specifying a battery system at build time, discuss with your electrician how the battery backup circuits will be separated — this affects how circuits are grouped in the switchboard

The Switchboard: Don't Undersize It

The switchboard is the core of your electrical system. Undersizing it — in terms of the number of circuit breaker positions — is a common outcome of specifying only what's needed now. A switchboard upgrade after occupation requires re-cabling, new metering arrangements, and network operator coordination. It's one of the most disruptive and expensive electrical changes you can make post-construction.

For a standard three-to-four-bedroom home, allow for:

• Individual circuits for high-load appliances (oven, cooktop, air conditioner, heat pump, dishwasher, washing machine, dryer)
• Multiple general power circuits (split across zones — not one circuit for the whole house)
• Multiple lighting circuits (split by zone for independent control)
• An outdoor/garden circuit
• Spare positions for future additions: EV charger, solar inverter, battery, additional air conditioning unit

In Tasmania, all switchboards in new residential buildings must include RCDs (residual current devices) as required by AS/NZS 3000 — confirm with your electrician which circuits require RCD protection and that the switchboard design accounts for this.

What's Included in a Typical Electrical Contract

Electrical work in a building contract is typically split between what's included at a fixed price and what's a prime cost (PC) item. Common inclusions/exclusions:

For more on how inclusions, PC items, and provisional sums work in a building contract, see our guide to standard inclusions.

Frequently Asked Questions

How many power points does a new home need?

There's no code minimum — the NCC sets safety requirements, not quantity. As a practical guide, most builders and electricians working on custom homes aim for at least 30–40 double power points in a 3–4 bedroom home, with living areas, kitchens, and home offices on the higher side. The rule of thumb from people who've done it before: estimate what you need, then add 30%. Additional power points during rough-in cost around $50–$100 each; the same point added after lining can cost $250–$500 or more.

Do I need 3-phase power for a new home in northern Tasmania?

Most residential homes in northern Tasmania run on single-phase power, which is sufficient for standard residential loads. Three-phase is worth considering if you're planning a large solar system (typically above 10kW inverter), want faster EV charging (7.2kW single-phase vs. 22kW three-phase), have high workshop loads (commercial-grade machinery), or are using a three-phase heat pump or HVAC system. Your electrician and your network service provider (TasNetworks) will advise whether three-phase is available at your address and what the connection cost involves.

What's the difference between a light fitting PC allowance and supplied fittings?

A PC (prime cost) allowance for light fittings means the builder has allowed a dollar amount per fitting (or a total allowance) for you to select the actual product. If your selections cost more than the allowance, you pay the difference; if less, you receive a credit. Owner-supplied fittings means you purchase the fittings directly and supply them to the electrician for installation — the contract covers installation labour only. Both approaches have trade-offs: PC allowances simplify the contract but require you to select on budget; owner-supply gives full product control but adds coordination work. Confirm with your builder which approach applies and what the allowance covers.

When in the build process should I finalise my electrical layout?

Ideally, the electrical layout (power point locations, switch positions, light fitting positions, circuit design) is finalised before the building contract is signed. In practice, your electrician will do a site walkthrough with you at the frame stage — before lining — to confirm positions and make any final adjustments. This is the last practical opportunity to make changes without significant cost. After lining, changes require cutting walls and patching, so treat the pre-lining walkthrough as your final opportunity and prepare thoroughly for it.

Getting the Electrical Right at Davies

At Davies, electrical design is addressed during the BuildPrint™ pre-contract stage alongside the full specification — not deferred to a site walkthrough after framing. The goal is to have power point layout, circuit design, data infrastructure, and future-proofing decisions documented before the contract is prepared, so that what's included is fully specified and there are no surprises about what's in scope.

If you're planning a new home in northern Tasmania, get in touch to start a conversation, or see our build process to understand how we approach the design and specification phase.