Solar Panel Installation Process NZ: Timelines, Steps & Rules

Key Takeaways

• The total solar installation timeline in New Zealand spans 4 to 8 weeks, stretching to 10 to 12 weeks if meter upgrades stall.
• Physical installation on your roof takes 1 to 2 days for residential arrays between 4 to 10 kW.
• Fair turnkey installation pricing ranges from $1.70 to $2.00 per watt ($14,000 to $15,000 for a typical 6.6 kW system in 2026).
• Solar is classified as High-risk Prescribed Electrical Work requiring an independent inspector to issue a Record of Inspection (RoI).
• Under building consent exemptions effective 23 October 2025, arrays under 40 sq m require no council consent.
• Never energise your inverter before your bidirectional smart meter is installed, or exported energy will be billed as consumption.

End-to-end solar installation timeline

Going solar in New Zealand is a regulated multi-stage journey. While the physical assembly of brackets, rails, and panels on your roof happens quickly, administrative approvals, electrical inspections, and meter swaps dictate the overall schedule:

Review distributor connection rules in our dedicated guide to distributed-generation-application-lines-company-nz.

Stage 1: Assessment, pricing, and switchboard readiness

A thorough solar installation begins with an on-site survey or digital roof modeling. Your installer evaluates roof aspect, pitch, and shading.

Pricing benchmarks

A fair turnkey price for residential solar in NZ is $1.70 to $2.00 per watt, fully installed. For a standard 6.6 kW system, this equates to roughly $14,000 to $15,000 in 2026. For an itemised cost breakdown across system sizes, consult our guide to solar-panel-costs-new-zealand.

Switchboard upgrades

The most frequent surprise cost during installation is switchboard remediation. Older homes with ceramic fuses or asbestos backboards cannot legally host a modern solar inverter without safety remediation. Switchboard upgrades add $1,500 to $4,000+ if the board is non-compliant. Learn how to identify these allowances early in how-to-read-solar-quote-new-zealand.

Stage 2: Council building consent exemption rules

Historically, building consents caused delays and added hundreds of dollars in council fees. Since 23 October 2025, residential rooftop solar installations benefit from streamlined national exemptions:

• Under 40 sq m array area: In wind zones classified as High or lower, no council building consent and no engineer sign-off are required.
• Over 40 sq m or higher wind zones: No building consent is required provided that a Chartered Professional Engineer designs or reviews the structural mounting.

Stage 3: Installation day on site

For a typical 4 to 10 kW residential system, physical installation requires one day, extending to two days for multi-story slate or concrete tile roofs.

During installation, the electrician needs to disconnect your mains electricity supply to safely wire the inverter and protection relays into your switchboard. This power interruption typically takes 1 to 2 hours, not the entire day.

All electrical connections must be performed by an EWRB registered electrician. Installers must adhere to AS/NZS 3000 and inverter integration standards under AS/NZS 4777.1.

Stage 4: Electrical compliance, CoC, ESC, and RoI

In New Zealand, grid-connected solar is legally classified as High-risk Prescribed Electrical Work (PEW). This classification imposes rigorous safety checks:

1. Certificate of Compliance (CoC) and Electrical Safety Certificate (ESC): Issued by the installing registered electrician within 20 days of project completion. For lines companies like Vector, the CoC must be submitted within 10 working days after installation.
2. Record of Inspection (RoI): An independent licensed electrical inspector must inspect the DC isolation, earthing, switchboard connections, and inverter anti-islanding protection. The inspector logs the Record of Inspection directly onto the national Energy Safety high-risk database.

Stage 5: Smart meter swap and system energisation

Once the installation passes inspection, your solar provider notifies your retail electricity supplier to request an import/export meter configuration.

• Turnaround: Metering equipment providers (MEPs) take 3 to 5 weeks (up to 30 working days) to schedule and complete a meter swap. Some power companies cover this fee (valued at $150 to $230), while others bill around $100.
• Critical energisation warning: Keep your inverter turned off until the new two-way smart meter is officially commissioned. If you energise early on an older mechanical or standard unidirectional digital meter, the meter will register exported solar electricity as consumption, billing you for power you generated and fed to the grid.

Once the meter is active, configure your export limits in accordance with national rules outlined in solar-export-limit-10kw-dynamic-export-nz.