Quick Answer
Yes. Under Queensland’s updated building energy requirements, eligible detached small homes measuring 50 m² or less can use a 5-star thermal-performance pathway instead of the usual 7-star requirement. A compact two-bedroom granny flat can qualify: the rule concerns the building’s classification and floor area, not the number of bedrooms. The design must still meet Whole of Home and other building and council requirements.
At a Glance
Eligible detached homes of 50 m² or less: 5-star thermal pathway under QDC MP 4.1.
A two-bedroom layout is possible, provided the design meets the size and other requirements.
A 12 m² deck and flyover roof are not compulsory simply to access the 5-star pathway.
Pricing may improve, but final costs depend on the design, site and builder quotation.
What Changed in Queensland in 2026?
The Queensland Development Code (QDC) MP 4.1 – Sustainable Buildings was updated on 14 August 2026. It provides a 5-star thermal pathway for eligible small homes of 50 m² or less. Most other new houses remain subject to a 7-star thermal requirement. Queensland also retains an optional outdoor living area credit for qualifying designs, but an outdoor living area is not mandatory for a small home that achieves the required rating without the credit.
Can a Granny Flat Under 50m² Have Two Bedrooms?
Yes. A carefully designed two-bedroom home can fit within a compact footprint. The arrangement needs to provide practical bedrooms, bathroom/laundry facilities, kitchen and living space while complying with ventilation, natural light, smoke-alarm, access and other applicable standards. The council’s secondary-dwelling controls and the available building area must also be checked.
For the energy concession, the important measurement is the QDC floor-area definition, not the number of bedrooms or a marketing description of the plan. Your energy assessor and building certifier should confirm the calculation for the actual drawings.
Do You Still Need a Deck or Flyover Roof?
Not necessarily. Queensland’s outdoor living area credit is optional. For an eligible small home assessed to meet 5 stars on its own, there is no general requirement to include a 12 m² deck or flyover roof just to obtain the 5-star thermal result. A deck, patio or flyover roof may still be a desirable lifestyle upgrade, or help a particular design achieve an optional outdoor-living credit.
At Hive Small Homes, this creates an opportunity to present a complete granny flat as the base design and offer decks and covered outdoor areas as optional additions. Site-specific shade, weather protection, drainage and building requirements may still influence the best solution.
Could This Make a Two-Bedroom Granny Flat More Affordable?
Potentially. A lower minimum thermal rating may reduce the need for some glazing, insulation or shading upgrades on certain projects. Removing a deck and flyover roof from the standard inclusion list can also lower the scope of work. However, these changes do not automatically make a granny flat the same price as a detached extension.
A separate granny flat may have different requirements for services, plumbing, kitchen facilities, fire separation, approvals and site works. Hive’s indicative prices should be updated only after the independent builder checks the revised specifications and confirms the costs. No fixed saving should be assumed.
What Does the 5-Star Rating Actually Cover?
The star rating measures the thermal performance of the building shell, including the roof, walls, windows and floors. It is separate from the Whole of Home assessment, which considers major fixtures and appliances. The applicable Whole of Home requirements still need to be met, as do other National Construction Code and Queensland requirements.
Does the New Rule Mean Approval Is Automatic?
No. Energy compliance is only one part of the process. Brisbane, Moreton Bay, Ipswich, Logan and Redland have different planning controls. Setbacks, site cover, zoning, overlays, sewer infrastructure, access, flood requirements and any council conditions must be assessed for the particular property.
Frequently Asked Questions
Is 50 m² included, or must the granny flat be smaller?
The Queensland Government describes the small-home pathway as applying to eligible homes of 50 m² or less. The certifier should confirm the QDC floor-area measurement for the completed design.
Can the granny flat be rented to someone other than family?
In many situations a secondary dwelling can be rented separately, but applicable planning, building, tenancy and property-specific requirements should be checked before making that decision.
Does the 5-star rule also apply to detached extensions?
Not automatically. An extension to an existing dwelling is assessed according to the applicable alterations-and-additions requirements and its classification. The 5-star small-home pathway should not be assumed to apply to all extension projects.
Free Site Assessment Report
Thinking about a compact one- or two-bedroom granny flat? Hive Small Homes offers a free preliminary Site Assessment Report to help identify zoning, setbacks, services, overlays and other obvious constraints before you commit to detailed plans.
Hive coordinates site feasibility, concept design, working drawings, engineering and building/plumbing approvals. Construction is contracted directly with an appointed independent QBCC-licensed builder.
Request Your Free Site Assessment (click)
Related Articles
Can You Build a Granny Flat on a Small Block?
Granny Flat vs Detached Extension – What’s the Difference?
How Much Does a Granny Flat Cost in Brisbane in 2026?
What to Check Before Building a Granny Flat on Your Property
Important Information
This article is general information, not building, planning, energy assessment, engineering or legal advice. Eligibility, floor area, approval pathways, specifications and pricing must be confirmed for each project by the relevant professionals. Published October 2026.
Official Sources and Further Reading
Queensland Government – Energy equivalence building standards: https://www.business.qld.gov.au/industries/building-property-development/building-construction/laws-codes-standards/sustainable-housing/energy-equivalence
Queensland Government – Queensland Development Code, MP 4.1: https://www.business.qld.gov.au/industries/building-property-development/building-construction/laws-codes-standards/queensland-development-code
National Construction Code: https://ncc.abcb.gov.au/
