Solar in Perth new housing estates: what to know before you build

Perth's growth corridors — Alkimos, Yanchep, Ellenbrook, Baldivis, Byford, Harrisdale, Canning Vale south, and others — are adding thousands of new homes each year. If you're building in a new Perth estate, solar decisions work differently from buying an existing property. Here's what to factor in.

Builder-included solar packages

Most Perth volume builders (Celebration Homes, Dale Alcock, Ventura, BGC, Summit Homes, etc.) now offer solar as a standard inclusion or a low-cost upgrade. These packages typically include:

• 6.6kW solar system (the common entry-level size) or sometimes 10kW
• Generic or mid-tier panel brands (often Jinko, Trina, or Canadian Solar)
• Standard string inverter (often Goodwe or SungrowS)

The pros of builder-included solar:

• Rolled into your construction loan (financed at home loan interest rates rather than personal loan rates)
• Installed during construction (conduit run before slabs are poured, minimising later retrofit cost)
• No separate Western Power NCN delay (builder manages the NCN as part of construction approval in many estates)

The cons of builder-included solar:

• Limited ability to compare specifications or substitute premium brands
• Builders typically mark up solar packages 20–40% above what a direct installer quote would cost
• Installation quality and warranty handling varies significantly between builders

The right approach: Get an independent quote from a Perth CEC-accredited solar company for the equivalent specification, compare against the builder's price, and factor in the financing cost difference between a construction loan and a post-build solar loan.

Estate covenants and solar restrictions

Many newer Perth estates include design covenants that govern the visual appearance of homes. These can affect solar placement in ways that surprise buyers:

Common covenant restrictions relevant to solar:

• "No visible roof-mounted equipment from the primary street" — can restrict panel placement on street-facing roof sections
• "Roof colour and material restrictions" — can affect whether solar panels (usually black or dark blue) are permitted on certain roof sections
• "No ground-mounted structures within the front setback" — prevents ground-mounted solar systems in the street-facing portion of the block

How to check: The estate covenants are included in the land title documents (a registered deed of restrictions). Your conveyancer will sight these at settlement. Ask specifically about solar-related restrictions before purchasing your lot.

Developer attitudes are evolving: Most Perth estate developers since approximately 2019 have updated covenants to either explicitly permit solar or avoid restrictions that would prevent it, recognising that solar is now essentially standard. Older estates (pre-2015) are more likely to have solar-restrictive covenants.

Western Power network timing in growth corridors

New housing estates require Western Power to install network infrastructure as the estate develops. In fast-growing Perth corridors, network capacity can lag developer construction timelines:

What this means for solar: Your system cannot be commissioned and connected to the grid until Western Power's distribution infrastructure in your street section is commissioned. In some new Perth estates, homeowners have been waiting 6–12 months after construction completion for Western Power to energise their connection and process solar NCNs.

This doesn't prevent panel installation, but it prevents grid connection and DEBS export earnings until the infrastructure is ready.

Before you build: Ask the developer about the Western Power commissioning status in your chosen stage. Stages with energised infrastructure are lower risk than stages where substation work or transformer installation is still in progress.

Export limits in high-solar-density estates

New Perth estates often achieve very high solar penetration rates — in some Alkimos and Baldivis estates, 60–80% of homes install solar within 5 years. Western Power has responded with tighter export limits in some new suburbs.

The implication: In some new Perth estates, the export limit for individual systems is 1.5kW or even 0kW (zero export) at the point of connection — significantly lower than the standard 5kW (single-phase) limit. These restrictions are notified on your NCN approval.

Homes in zero-export or restricted-export areas generate solar and self-consume as normal, but cannot export excess power to the grid. DEBS credits are therefore zero or minimal.

How to check: Your installer can query the specific Western Power export limit for your lot before you commit to a system. In areas with confirmed zero-export restrictions, oversizing your system (more panels than you can self-consume) reduces the value of the additional capacity.

EV charging conduit: include it from the slab

NCC 2022 requires EV charging conduit from the switchboard to the garage for new homes (from October 2023 in WA). Confirm with your builder that this conduit is included and documented on the electrical certificate.

More broadly, during construction is the cheapest time to install additional conduit for future infrastructure:

• Solar conduit from the roof space to the switchboard (if not already included as part of the solar package)
• Battery conduit from the garage or external wall to the switchboard
• Conduit for future second EV charger

Running conduit during construction costs $50–$200. Running it after construction is complete costs $600–$2,000 per conduit due to the need to chase walls or run externally.

Home orientation and solar yield in new estates

New Perth estates often have blocks with varying street orientations. Your home's orientation on the block significantly affects solar yield:

• North-facing roof (ideal): Living areas and major roof surface face north. Best solar yield in Perth.
• East/west split: Common on corner or deep blocks. East and west panels yield less than north (approximately 20% less annual generation than north-facing).
• South-facing primary roof: Uncommon in Perth builder designs, but possible on odd-orientation blocks. South-facing panels yield significantly less than north in Perth's latitude.

When selecting your lot, confirm the street orientation and your builder's standard floor plan orientation. If your primary roof surface will face east or west, discuss tilted north-facing panels or ask about alternative configurations during the design phase.

Building in a new Perth estate creates genuine solar advantages (construction loan financing, conduit run before slab, coordinated NCN) but also specific risks (estate covenants restricting placement, Western Power network timing delays, high-penetration export limits in some suburbs). Review lot orientation, check for solar-related covenants in the deed of restrictions, and confirm Western Power network commissioning status in your specific stage before committing.