NCC 2025 was published in late 2024, with state-by-state adoption beginning 1 May 2025. Queensland's adoption is staged: residential provisions take effect 1 October 2025, with a transition window for builds approved before that date running through 30 April 2026. After that window closes, every QLD residential approval must comply with the new code.
For builders running release programs through the second half of 2025 and into 2026, this is a planning question, not a paperwork question. Get your specification right ahead of the transition, or risk a compliance redesign of your standard plan set mid-release.
The four headline changes for residential
1. Tightened whole-of-home equipment standards
NCC 2025 raises the minimum efficiency standards for regulated equipment counted in the whole-of-home calculation:
- Hot water systems: minimum 4-star MEPS for electric storage; minimum heat-pump efficiency thresholds for new electric installs.
- Ducted air conditioning: tighter minimum cooling-COP and heating-COP thresholds.
- Lighting: clarification on integrated LED specification (most new builds already meet this; tightening mostly affects retrofit-style installs that were previously slipping through).
Net effect: the demand side of the whole-of-home equation gets smaller, which means the same solar generation contributes proportionally more to the star rating. This is a tailwind for solar's already-strong cost-per-star advantage.
2. EV-readiness integrated into NatHERS
The headline change. NCC 2025 introduces an EV-readiness pathway in the whole-of-home calculation for the first time. New homes with provisioned EV charging infrastructure (cable runs, dedicated circuit, capacity in the consumer unit) receive a small but non-trivial NatHERS contribution.
Practically, this rewards builders who include an EV charger in the spec — or at least the wiring for one. The Tesla Wall Connector that's part of the Premium package now scores both as a standard product feature and as a NatHERS contribution.
For Essential and Complete packages (no EV charger included), the cheapest compliance move is to provision the wiring and a single dedicated 32-amp circuit at switchboard. That alone, without an installed charger, is enough to capture the readiness allowance.
3. Battery-readiness clarified
NCC 2025 clarifies how battery storage is counted in the whole-of-home calculation. Pre-2025, battery contribution was modelled inconsistently across software tools. The 2025 framework standardises the methodology around three parameters:
- Usable battery capacity (kWh)
- Round-trip efficiency (typically 90-92% for lithium-iron-phosphate)
- Daily cycle assumption (one full cycle for solar self-consumption)
Most assessment tools have already been updated. The result: battery contributions are slightly more conservative than they were under NCC 2022's looser framework — typically 0.1-0.2 stars less for the same battery size. Practically, this means a 9.6 kWh battery now reliably delivers 0.5 stars rather than 0.6 stars on the same home spec. The ladder still works; the rungs just got slightly narrower.
4. Optional 7.5-star pathway in some councils
While the federal NCC 2025 minimum remains 7 stars for residential, several QLD local councils have foreshadowed sub-jurisdictional minimums of 7.5 stars for high-density or sustainability-precinct estates. The Aura precinct on the Sunshine Coast and parts of the Ripley Valley PDA are early candidates for these tightened minimums.
For builders working in those precincts, the practical impact is identical to choosing the Complete package as standard: 6.6 kW solar + 9.6 kWh battery reliably clears 7.5 stars on most QLD project home plans.
Transition timeline for QLD builders
- Now → 30 April 2026: NCC 2022 still applies to builds approved before 1 October 2025. Existing release programs run as-is.
- 1 October 2025: NCC 2025 effective for new approvals.
- 30 April 2026: Transition closes. All new approvals on NCC 2025.
- From 1 May 2026: Plan sets that haven't been NCC-2025-validated risk being non-compliant on submission. Allow 8-12 weeks for documentation re-issue.
What to change in your standard spec
Essential package builders
Add EV-readiness wiring (32A dedicated circuit, conduit run to garage) to the standard inclusion. Marginal cost: ~$200-400 per home. NatHERS uplift: ~+0.1 stars. Cost-per-star: extremely cheap.
Complete package builders
Battery contribution is slightly conservative under NCC 2025; the 9.6 kWh sweet spot still works for 7.5-star compliance. No change needed.
Premium package builders
EV charger now contributes as standard. The Tesla Wall Connector is recognised. No change needed; the package is already aligned with NCC 2025 incentives.
The structural take-home
NCC 2025 is incremental, not revolutionary. It tightens equipment standards on the demand side (which makes solar's contribution slightly more valuable per kW), introduces EV-readiness (which makes the Premium package's existing EV charger more visible in the rating), and standardises battery methodology (which makes Complete-package outcomes slightly more predictable but slightly less generous).
For QLD builders working with Trade Solar, the practical change is small: add EV-readiness wiring to Essential package homes, and validate your assessor's tool is on the NCC 2025 framework before lodging plans for approval after 30 April 2026.
Solar remains the cheapest single lever to NatHERS compliance. NCC 2025 doesn't change that — it strengthens it.