Electrical Fit-Out & Wiring Guide Australia

Things to consider before you choose

Plain practical advice for Australian builds. No fluff.

AS/NZS 3000 compliance is non-negotiable

AS/NZS 3000:2018 (the Wiring Rules) sets out every requirement for electrical installations in Australian homes. Your electrician must follow these rules, and your work will be inspected and certified before connection to the grid. Key requirements include RCD protection on all power and lighting circuits, minimum clearances around switchboards, correct cable sizing for load and distance, IP-rated fittings in wet areas and proper earthing and bonding. Non-compliant work can void insurance, create serious safety hazards and hold up occupancy certificates. Always use a licensed electrician and ensure they lodge compliance certificates with your state or territory regulator.

RCD protection saves lives

Residual current devices (RCDs) detect tiny imbalances in current flow and cut power within milliseconds, protecting you from electric shock and reducing fire risk. AS/NZS 3000 requires RCD protection on all socket outlet circuits and lighting circuits in homes. Most modern switchboards use combination RCBO (RCD plus circuit breaker) units on each circuit, giving both overload protection and earth-leakage protection. Older homes may have a single RCD protecting multiple circuits, but this means one faulty appliance can trip power to half the house. When upgrading, consider individual RCBOs for each circuit so a fault isolates only the affected area.

Plan GPO locations carefully now

Nothing frustrates homeowners more than too few power points in the wrong places. Walk through your floor plan room by room and think about furniture layout, appliances, charging stations and future needs. Kitchens need dedicated circuits for ovens, cooktops and dishwashers, plus multiple GPOs above benchtops (spaced no more than 1200 mm apart). Living areas benefit from double GPOs every 3 to 4 metres along walls, behind TV locations and near desks. Bedrooms need GPOs on each side of the bed, near wardrobes and at desks. Laundries need outlets for washing machines, dryers and ironing. Adding GPOs during construction costs around thirty to fifty dollars each; retrofitting them later can be two hundred dollars or more per point.

EV charging infrastructure

Electric vehicle adoption is accelerating in Australia, and pre-wiring for an EV charger during construction is far cheaper than retrofitting. A typical home EV charger draws 7 kW (single-phase) or up to 22 kW (three-phase), requiring a dedicated circuit from the switchboard to the garage or carport. Even if you don't own an EV yet, install conduit from the switchboard to the proposed charger location and ensure your switchboard has capacity for a future 32 A or 40 A breaker. Retrofitting conduit through finished walls and ceilings can cost thousands. If you have three-phase power available, consider using it for the EV circuit to enable faster charging and reduce load on any single phase.

Three-phase power: when and why

Most Australian suburban homes have single-phase power (240 V), but three-phase (415 V between phases, 240 V to neutral) is common in newer estates and essential for larger homes with ducted air-conditioning, workshop equipment or commercial-grade appliances. Three-phase supply divides electrical load across three separate conductors, reducing voltage drop and allowing higher total capacity without upgrading the main cable from the street. If three-phase is available in your street, connection typically costs an extra fifteen hundred to four thousand dollars depending on your distributor and distance from the pole. The real benefit comes when you have multiple large loads (air-con compressors, pool pumps, kilns, EV chargers) that can be balanced across phases.

Switchboard size and layout

Your switchboard (meter box) is the heart of your electrical system. Modern boards need space for the main switch, individual RCBOs for each circuit, surge protection devices, solar inverter connections and smart meters. A typical new home needs 18 to 24 circuit positions minimum, and going larger (30 to 36 ways) adds only marginal cost during construction but provides flexibility for future additions like battery systems, sub-boards for granny flats or workshop circuits. Boards must be installed in accessible, ventilated locations with clearances specified in AS/NZS 3000 (typically 600 mm in front, no obstructions above). External boards need IP-rated enclosures suitable for your climate.

Smart home wiring and data cabling

Smart lighting, automated blinds, security systems, multi-room audio and networking all need infrastructure planned during first fix. At minimum, run Cat6 or Cat6A data cable to every room, the garage and outdoor entertainment areas, all home-running to a central comms cabinet. For smart lighting, you may need neutral wires at every switch location (older homes often lack this), extra low-voltage control wiring or specific smart switch compatibility. Discuss your smart home intentions with your electrician early. Retrofitting control cabling and data points through finished walls is expensive and often impossible without major disruption. Even if you're not installing smart systems immediately, the conduit and cable infrastructure should go in during first fix.

Lighting circuit design

Separating lighting onto dedicated circuits (not shared with power circuits) is required by AS/NZS 3000 and makes fault-finding easier. In larger homes, divide lighting into multiple circuits by zone (bedrooms, living, outdoors) so a single tripped breaker doesn't leave the whole house dark. Plan for downlight transformers, dimmer compatibility, and in wet areas (bathrooms, covered outdoor areas) use IP-rated fittings as required. LED lighting has changed load calculations dramatically (a whole house might draw under 200 W total for lighting), but you still need to allow for starting inrush on transformers and ensure dimmers are LED-compatible to avoid flicker.

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Types of electrical fit-out and wiring guide for australian homes

Quick compare

	Standard single-phase fit-out	Three-phase fit-out	Smart home pre-wired fit-out
Typical cost	$8,000 to $14,000 supply and install for a typical 4-bed home, including switchboard, all circuits, GPOs and light fittings excluded	$10,000 to $18,000 supply and install for a 4-bed home, plus $1,500 to $4,000 network connection fees depending on location	$12,000 to $20,000 supply and install for a 4-bed home, including data cabling and smart-ready switching infrastructure
Best for	Standard suburban homes, townhouses, smaller renovations without heavy electrical loads	Larger homes, properties with ducted air-con, home workshops, EV owners, solar and battery systems	Tech-savvy owners, high-end builds, home offices, multi-room AV and integrated security systems

Standard single-phase fit-out

240 V single-phase supply with main switchboard, RCBOs on all circuits, lighting and power separated, basic GPO and lighting layout to NCC minimum standards.

Typical cost: $8,000 to $14,000 supply and install for a typical 4-bed home, including switchboard, all circuits, GPOs and light fittings excluded

Pros

• Lowest connection and installation cost
• Adequate for most suburban homes under 200 m2
• Simple load balancing and fault-finding
• Standard equipment readily available

Cons

• Limited total capacity (typically 63 A or 80 A max)
• Can struggle with multiple large appliances running simultaneously
• Not suitable for three-phase air-conditioning or large workshop equipment
• May require upgrade if adding EV charger and solar/battery

Best for: Standard suburban homes, townhouses, smaller renovations without heavy electrical loads

Three-phase fit-out

415 V three-phase supply with load distributed across three phases, larger switchboard, capacity for ducted air-con, EV charging and high-demand appliances.

Typical cost: $10,000 to $18,000 supply and install for a 4-bed home, plus $1,500 to $4,000 network connection fees depending on location

Pros

• Higher total capacity without voltage drop issues
• Enables faster EV charging (up to 22 kW)
• Better suited to ducted air-conditioning and large homes
• Allows balancing of loads to reduce peak demand on any one phase

Cons

• Higher upfront connection cost from distributor
• More complex switchboard and slightly higher sparky labour
• Not all streets have three-phase available
• Overkill for small homes without large loads

Best for: Larger homes, properties with ducted air-con, home workshops, EV owners, solar and battery systems

Smart home pre-wired fit-out

Includes all standard circuits plus neutral wires at every switch, Cat6A data cabling to all rooms, conduit for control wiring, central comms cabinet and provision for automation systems.

Typical cost: $12,000 to $20,000 supply and install for a 4-bed home, including data cabling and smart-ready switching infrastructure

Pros

• Future-proofs for smart lighting, automated blinds, security and AV
• Structured data cabling supports high-speed networking and Wi-Fi mesh
• Central comms cabinet keeps network gear and servers organised
• Much cheaper to install during construction than retrofit

Cons

• Adds 15 to 25 per cent to electrical budget
• Requires detailed planning and coordination with automation installers
• Some cabling may become obsolete as wireless tech improves
• Not all electricians experienced in smart home infrastructure

Best for: Tech-savvy owners, high-end builds, home offices, multi-room AV and integrated security systems

Solar and battery-ready fit-out

Switchboard designed with space and capacity for solar inverter connection, battery inverter or AC-coupled battery, export limiting devices and smart meter integration.

Typical cost: $9,000 to $15,000 for base fit-out with solar-ready provisions; actual solar and battery install separate

Pros

• Avoids costly switchboard upgrades when adding solar later
• Allows for battery storage integration from day one or in future
• Supports smart energy management and time-of-use tariffs
• May include sub-metering for detailed consumption monitoring

Cons

• Slightly larger switchboard and additional circuit capacity needed
• May require three-phase or specific inverter-ready breakers
• Adds modest cost even if solar not installed immediately
• Needs coordination with solar installer for final connection

Best for: Environmentally conscious owners, homes planning solar PV, future battery storage, energy independence goals

Granny flat or dual-occupancy fit-out

Separate sub-board fed from main switchboard or separate meter, allows independent billing or switching, complies with NCC for secondary dwellings.

Typical cost: $3,500 to $6,500 for sub-board and feed cable from main board, plus metering costs if separate meter required

Pros

• Separate metering for rental income properties
• Isolates electrical faults to one dwelling
• Meets strata and council requirements for dual occupancy
• Can be switched off independently when vacant

Cons

• Higher install cost due to sub-board and additional cable runs
• May require network company approval and separate meter
• Main switchboard must have capacity to feed sub-board
• Additional ongoing supply charges if separately metered

Best for: Granny flats, dual-occupancy blocks, rental studios, properties with separate workshops or studios

Outdoor and alfresco electrical

Weatherproof GPOs, lighting circuits, ceiling fan points, outdoor heater circuits and entertainment area wiring all to IP-rated standards for Australian outdoor conditions.

Typical cost: $1,500 to $4,500 depending on number of outdoor GPOs, lighting points and distance from switchboard

Pros

• Enables outdoor kitchens, BBQ areas, pool equipment and garden lighting
• IP-rated fittings withstand rain, dust and UV exposure
• Dedicated circuits prevent overloading indoor boards
• Adds significant amenity and property value

Cons

• IP-rated components cost more than indoor equivalents
• Conduit and cable runs often longer from main board
• Must comply with pool and spa electrical safety zones if applicable
• Outdoor circuits require RCD protection and appropriate cable types

Best for: Alfresco areas, pool surrounds, outdoor kitchens, garden lighting, sheds and workshops

How much does it cost in Australia?

Electrical costs in Australia vary by home size, complexity and regional labour rates, but a typical four-bedroom single-storey home in Adelaide or metro areas runs eight thousand to fourteen thousand dollars supply and install for a standard single-phase fit-out in 2025-26. This includes the switchboard, all GPOs and light switch points (but not the light fittings themselves), smoke alarm hard-wiring, appliance circuits and basic outdoor GPOs. Three-phase adds around fifteen to twenty-five per cent to labour and materials, plus network connection fees. EV charger circuits (cable and breaker only, not the charger unit) cost five hundred to twelve hundred dollars if installed during construction, but two to four thousand if retrofitted. Data cabling runs about sixty to one hundred dollars per point for Cat6A, with a central patch panel and cabinet adding another four hundred to eight hundred dollars. Smart home pre-wiring can increase electrical budget by fifteen to thirty per cent depending on scope. Always get itemised quotes showing supply-only pricing versus labour, and expect to pay more for experienced electricians who understand solar, battery and smart home integration. Hourly rates for licensed sparkies in metro areas currently sit around eighty-five to one hundred and thirty dollars plus GST, with apprentices at lower rates. Most electrical work is quoted as a package price for the whole job rather than hourly.

Common mistakes to avoid

Skimping on GPO locations to save a few hundred dollars, then spending thousands retrofitting points later when you realise you need them.

Not future-proofing for EV charging, solar or battery by leaving no spare capacity or space in the switchboard for additional circuits.

Failing to run neutral wires to all switch locations, making it impossible or expensive to retrofit smart lighting later.

Installing downlights without considering insulation clearance, fire rating and IC-F rating requirements in the NCC, leading to compliance failures and heat buildup.

Using single RCDs to protect multiple circuits instead of individual RCBOs, so one fault trips half the house and fault-finding becomes a nightmare.

Not coordinating electrical rough-in with plumber and HVAC trades, leading to clashes, rework and delays during first fix.

Choosing the cheapest quote without checking the electrician is licensed, insured and has experience with your specific requirements like three-phase or smart home systems.

Avoid these mistakes by working with listed suppliers from BuildPilot's directory.

Popular questions

Yes. AS/NZS 3000:2018 requires RCD protection on all socket outlet circuits (GPOs) and all lighting circuits in domestic installations. This applies to new builds and substantial renovations. RCDs must be rated at 30 mA or less and trip within 300 milliseconds. Most modern installations use RCBOs (combined RCD and circuit breaker) on each individual circuit, which provides both overload protection and earth-leakage protection. Older homes may not have full RCD coverage, but any new work or upgrades must bring affected circuits up to current standards. Your electrician will ensure compliance and lodge the required certificates with your state electrical safety regulator.

The NCC sets minimum standards, but practical advice is to exceed them. Bedrooms should have at least two double GPOs (one on each side of bed, one for desk or TV area). Living rooms benefit from doubles every 3 to 4 metres along walls, plus dedicated points behind TV and AV equipment. Kitchens need doubles above benchtops spaced no more than 1200 mm apart, dedicated circuits for oven and cooktop, and points for dishwasher, fridge and small appliances. Bathrooms typically get one double (not above the vanity in the shaver-light zone), laundries need points for washing machine, dryer and ironing. Garages and workshops should have multiple doubles on separate circuits. During construction, GPOs cost around thirty to fifty dollars each; retrofitting later can be two hundred dollars or more per point, so plan generously now.

Three-phase becomes worthwhile if you have ducted air-conditioning (especially multiple zones), plan to install an EV charger, have a home workshop with heavy machinery, or want to future-proof for high electrical loads. Three-phase divides the load across three conductors, reducing voltage drop and allowing higher total capacity. It enables faster EV charging (up to 22 kW vs 7 kW on single-phase) and smoother starting of large motors. The downside is higher upfront connection cost (fifteen hundred to four thousand dollars extra depending on distributor) and slightly higher switchboard cost. If three-phase is available in your street and you have or plan large loads, it's usually worth the investment. For a basic suburban home under 200 m2 with standard appliances, single-phase is adequate and cheaper.

At minimum, install conduit (typically 25 mm or 32 mm) from your switchboard to the garage or carport location where a future charger would be mounted. Ensure your switchboard has space for a dedicated 32 A or 40 A circuit breaker. If you have or can get three-phase power, consider running three-phase cable through the conduit to enable faster charging later. The conduit and cable run might cost six hundred to twelve hundred dollars during construction but saves thousands in retrofit costs when you eventually buy an EV. Your electrician should terminate the cable at the switchboard end but leave it disconnected (and clearly labelled) at the charger end. When you're ready to install a charger, the sparky just connects the final circuit and the charger unit, usually a half-day job instead of a major retrofit.

No. In all Australian states and territories, electrical work must be performed by licensed electricians except for very limited exemptions (like replacing a light globe or plugging in appliances). Installing GPOs, switches, circuits or any fixed wiring is illegal for unlicensed people and extremely dangerous. DIY electrical work voids insurance, can cause fires or electrocution, and will be picked up during building inspections or when you try to sell the property. Penalties include heavy fines and potential criminal charges. Licensed electricians carry insurance, comply with AS/NZS 3000, and lodge compliance certificates that are required for occupancy and sale. The small amount of money you might save is massively outweighed by the legal, safety and insurance risks.

A circuit breaker protects against overload and short-circuit by cutting power when current exceeds the rated capacity (e.g. 10 A, 16 A, 20 A). An RCD (residual current device) detects tiny imbalances between active and neutral wires (indicating current leaking to earth, such as through a person) and trips within milliseconds to prevent electrocution. An RCBO is a combination device that provides both overload protection and RCD protection in a single unit. Modern Australian switchboards typically use RCBOs on every circuit so each circuit has independent earth-leakage and overload protection. Older boards may have separate breakers with one or two RCDs protecting groups of circuits, but this means a single fault can trip multiple circuits at once, making fault-finding harder.

Switchboard upgrades in Australian metro areas typically cost two thousand to five thousand dollars depending on size, complexity and whether the meter box needs relocating or upgrading. A basic upgrade involves replacing an old fuse board or early circuit-breaker board with a modern RCD/RCBO board, often increasing capacity from 40 A or 63 A to 80 A or 100 A. If you're adding circuits for solar, EV charging or renovations, costs increase. Three-phase switchboard upgrades run higher. If the meter box is in the wrong location (no longer compliant for access or clearances), relocating it can add several thousand dollars. Old ceramic fuse boards and boards with asbestos backing require careful handling and disposal. Always use a licensed electrician and ensure they provide compliance certificates lodged with your state regulator.

Cat6A is the current standard for residential data cabling in 2025-26, supporting 10 Gbps over 100 metres and backward compatible with all existing network equipment. Run Cat6A from a central comms cabinet to every bedroom, living area, study, garage and outdoor entertainment area. Include at least two cables to TV locations (one for internet, one for potential video distribution). The comms cabinet should house your NBN connection device, network switch, Wi-Fi access points and any servers or NAS drives. Each cable run costs around sixty to one hundred dollars, with the cabinet and patch panel adding four to eight hundred. Even if you rely on Wi-Fi now, hardwired connections are faster, more reliable and essential for high-bandwidth uses like 4K streaming, gaming and large file transfers. Fibre-optic cabling is overkill for most homes in 2025 but may be worth considering for extremely long runs or future 25 Gbps+ needs.

Electrical Fit-Out and Wiring Guide for Australian Homes

Things to consider before you choose

AS/NZS 3000 compliance is non-negotiable

RCD protection saves lives

Plan GPO locations carefully now

EV charging infrastructure

Three-phase power: when and why

Switchboard size and layout

Smart home wiring and data cabling

Lighting circuit design

Types of electrical fit-out and wiring guide for australian homes

Standard single-phase fit-out

Three-phase fit-out

Smart home pre-wired fit-out

Solar and battery-ready fit-out

Granny flat or dual-occupancy fit-out

Outdoor and alfresco electrical

How much does it cost in Australia?

Common mistakes to avoid

Suppliers on BuildPilot

Trades who work with electrical fit-out and wiring guide for australian homes

Popular questions

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