May 21, 2026

How to Win Commercial Solar Contracts: Moving from Residential to Commercial Work in Australia (2026)

The commercial solar market in Australia is booming. Businesses facing escalating electricity costs, mandatory emissions reporting requirements under ASIC’s climate disclosure rules, and increasingly affordable solar technology are investing in commercial systems at record rates.

For solar installation businesses that have established residential capabilities, commercial solar represents a natural growth path — higher project values, longer-term customer relationships, and less price-sensitive buying decisions. A single commercial solar contract can represent the revenue of 20–30 residential installs.

The challenge: commercial solar is a different game from residential. Different design requirements, different procurement processes, different compliance obligations, and a different sales process. This guide covers what you need to know to move from residential to commercial solar contracts.

Understanding the Commercial Solar Market

Commercial solar in Australia covers a broad range:

Small commercial (10–100kW): Warehouses, small factories, commercial buildings, large homes with commercial supply. Often procured directly, single decision-maker.
Mid-size commercial (100–500kW): Industrial facilities, shopping centres, agricultural operations, larger commercial buildings. Often requires tender or formal quote process.
Large commercial (500kW+): Major industrial, grid-scale adjacent projects. Formal tender with multiple consultants involved.

For businesses making the transition from residential, the small commercial market (30–100kW) is the natural starting point. These projects have decision-makers who behave similarly to residential buyers — they want a trusted, accountable contractor, not just the cheapest quote.

How Commercial Solar Procurement Works

Unlike residential solar — where the homeowner calls you, you visit the site, you send a quote — commercial procurement often involves a more structured process.

Direct negotiation (small commercial)

Small commercial customers often find you the same way residential customers do: Google, referral, GBP. The process is more like residential: site visit, energy analysis, proposal, negotiation. Decision is typically made by the business owner or operations manager.

Your advantage here: The same trust signals that win residential work (reviews, CEC accreditation, local presence) also work for small commercial buyers. Relationships matter.

Formal tender process (mid-size commercial)

Larger commercial projects are often procured through a formal tender or Request for Proposal (RFQ) process. This may be managed by:

A procurement team within the business
A building manager or facilities manager
An energy consultant who has been engaged to manage the process

The tender typically requires:

A detailed written proposal with system design, specifications, and pricing
Evidence of relevant experience (past commercial projects)
Company credentials (CEC accreditation, insurance certificates, references)
A breakdown of the installation methodology, timeline, and safety plan

Key difference from residential: You’re often not just competing on price. The evaluation criteria include experience, methodology, and confidence that the contractor can deliver a complex project without issues.

Government and large corporate tenders

State government agencies, councils, universities, and ASX-listed companies often use formal procurement portals (e.g., NSW Tenders, VIC Buy, AusTender). These require supplier registration, compliance documentation, and formal evaluation processes.

This market requires more administrative capability but offers larger contracts and government payment security.

The Commercial Solar Design Differences

Commercial solar design is more complex than residential and requires different skills, tools, and potentially additional accreditation.

System sizing and energy analysis

For residential solar, system sizing is relatively straightforward: match the system to the roof space and general consumption pattern. For commercial, proper sizing requires:

Analysis of actual consumption data (interval data, half-hourly load profiles from the network)
Load profiling by time-of-use to match solar generation to consumption timing
Assessment of network tariff structure (demand charges, time-of-use rates, network access charges)
Payback modelling under current and forecast electricity pricing

If you don’t have experience with commercial energy analysis, partner with someone who does before you pitch commercial work. A solar design that doesn’t account for demand charges can produce a payback calculation that’s dramatically wrong — losing the customer’s trust and potentially exposing you to liability.

Three-phase power

Most commercial systems operate on three-phase power supply. Three-phase inverter installation has different requirements to single-phase residential. Ensure your team has three-phase experience.

Structural engineering

Commercial rooftop solar on a large shed, warehouse, or industrial building often requires a structural engineering assessment to confirm the roof can carry the panel load. Residential solar on a standard tiled or metal roof generally doesn’t. In commercial, it’s often a mandatory step — and it needs to be factored into your timeline and cost.

High-voltage system considerations

Systems above 30kW DC start to interact with high-voltage isolation and earthing requirements differently. Systems above certain thresholds may require involvement of a Level 2 ASP (Accredited Service Provider) for the network connection. Know these thresholds before you design the system.

Metering and monitoring requirements

Commercial installations typically require interval metering (Class 4 or Class 2 meters) rather than the accumulation meters on many residential properties. Network-connected monitoring for commercial systems is standard.

Building Your Commercial Solar Credentials

Winning commercial solar contracts requires demonstrating experience. If you don’t have commercial installs yet, here’s how to build the credential base:

Start with small commercial in your network

Your first commercial solar projects don’t need to come from competitive tenders. They often come from existing relationships:

A residential customer who also owns a business
A local business owner you know through a Chamber of Commerce or BNI group
A referral from your accountant, banker, or supplier network

Do those first few commercial jobs excellently, photograph them thoroughly, get a testimonial or case study, and you have the credentials to pursue the next level.

Get the right accreditation

Check that your CEC accreditation covers the system sizes you’re targeting. Systems above 100kW require a different accreditation level (Design — Large-scale, or equivalent). Confirm your endorsements before bidding on projects outside your current accreditation scope.

Consider partnering for your first larger projects

Rather than going it alone on your first mid-size commercial project, consider subcontracting or joint-venturing with a business that has the experience. You gain the experience and a project reference; they get additional capacity. This is how many successful commercial solar businesses built their initial credentials.

Writing a Winning Commercial Solar Proposal

The proposal is your sales document for commercial solar. A strong commercial proposal includes:

Executive Summary: One page. What’s the recommendation, what’s the investment, what’s the return, what are the next steps. Busy decision-makers read this first.

Energy Analysis: Show you understand their consumption. Display the load profile, how solar generation aligns with it, and the annual savings calculation. Use actual interval data where available.

System Design: Technical specification — panel brand and model, inverter, mounting system, monitoring. Include a design layout of the roof showing the array. Explain why you specified these products.

Financial Analysis: Year 1 savings, simple payback period, 25-year NPV, IRR. Commercial buyers understand financial metrics — present them clearly.

Implementation Plan: Timeline, site safety plan, installation methodology, commissioning process. Shows you’ve thought through the project management.

Company Credentials: CEC accreditation, insurance certificates, relevant case studies (photos, system size, customer name if they’ve given permission), references.

Pricing: Clear, itemised. Separate hardware, installation labour, engineering, connection fees. Not a single total number.

Managing Commercial Jobs in ServiceM8

Commercial solar jobs are larger, more complex, and have more moving parts than residential. The job management discipline that works for residential needs to scale up for commercial.

In ServiceM8, you can manage commercial projects with:

Multi-day job scheduling across multiple teams
Purchase order tracking for major equipment orders
Photo and document management for compliance records
Progress billing for staged payment commercial contracts
Client communication history tracked against the job

See our guide to digital job management for solar installers for the full operational workflow.

Commercial Solar Pricing: Key Differences From Residential

Price per watt ($/W) installed is the standard commercial solar pricing metric. In 2026:

Small commercial (30–100kW): $0.80–$1.20/W installed (depending on system complexity, location, and roof conditions)
Mid commercial (100–500kW): $0.70–$1.00/W installed

A 100kW system at $0.90/W = $90,000. Compare to 13 residential 6.6kW installs at $7,500 each = $97,500. Similar revenue, but one job vs 13 jobs.

Commercial jobs have higher absolute margin potential but also higher complexity and risk. Get your cost model right — particularly for projects involving structural engineering, switchboard upgrades, and complex network connection processes.