Throughout the construction industry, there is a noticeable divide between academics and practitioners.

Each of these actors operate with their own logic, incentives and measures of success. Academics prioritise research, evidence, teaching and the spread of knowledge. Practitioners focus on delivery, scope, margins and outcomes. Both are valuable. However, they are not frequently tested against each other in the same arena.

An opportunity to design and develop a new residential project provided exactly that test. Whilst teaching property and construction at Deakin University, where much of the curriculum centres on sustainable building design principles and the business case for sustainability, we were recently able to test our teachings in the real world and develop a residential house from our teaching notes.

These teaching principles are internally coherent, logically structured, well evidenced and, within the classroom, were convincing. However, we wanted to validate them in a project. In class, we present well researched and evidenced points and the students write them down. What happens when the same points are given to a subbie or a planning officer? We sought to test the teaching when exposed to the frictions of practice. These include cost, stakeholder compromise, supply chain factors, site characteristics, time and other factors.

As theory would suggest, the project began with site selection and design intent. The ambition was clear: to deliver a house approaching an 8-to-9-star NatHERS energy rating and to see how many other aspects of the house could genuinely be considered “sustainable.” The academic toolkit proved useful. Design principles translated well into early decisions. Structured frameworks helped to guide thinking in a disciplined way.

However, the transition from theory to execution revealed the limits of purely academic reasoning.

In practice, sustainability is not a binary outcome but a negotiated one. Each incremental improvement – such as moving from a 7.5 to an 8-Star rating – came with discussions on costs and increasingly complex trade-offs. A discussion around using a concrete slab floor to create thermal mass on the northern side of the dwelling also started a discussion about the embodied energy of the same concrete slab. This led to us peering over the fence at a passive house being constructed next door and contemplating their (low thermal mass yet also low embodied carbon) timber floor.

What appears to be optimal in a model is not always viable in a budget, though this, happily, can be the reverse also. Subbing out a paved driveway for an aggregate gravel porous driveway provided an unexpected cost benefit that also lowered the building’s footprint. However, a housing estate design guideline that forced a garage onto the house when we were happy to simply park on the aggregate driveway was a negative cost effect (and  added material use) which could not be avoided.

Similarly, collaboration introduced competing priorities as project partners did not always share the same weighting of cost, performance, sustainability and design intent.

These tensions highlight differences such as:

• Academics optimise for broader provable teachings.
• Practitioners optimise for agreed project outcomes within real parameters.

Neither approach is inherently superior. In fact, the project demonstrated that the strongest results emerged when the two perspectives were combined. Academic frameworks provided direction and ambition whilst practical experience enforced discipline and realism.

The question of whether the final product could truly be called “sustainable” remains unresolved. The building incorporated high-performance design features, efficient systems and thoughtful material choices. Yet it also relied on carbon-intensive elements such as concrete and steel. Some aspects remained unknown and uncontrollable, such as the skips that left the site and whose content’s fate could never be determined.

This case also raises other discussions which are often underexplored in both domains. For example, sustainability is not simply a function of energy efficiency and design performance, but is of the early entrenchment of sustainable goals, of degrees of control over the project, longevity, and context.

This is where both academia and practice can learn from a broader perspective. Pre-industrial and Indigenous approaches to shelter demonstrate forms of sustainability that are not easily captured in modern rating tools but also provided comfortable homes. This suggests that the future of the sustainable housing discipline may lie in a blend of education and practical experience  to make incremental steps towards ever more sustainable contemporary housing.

Ultimately, the most valuable outcome of crossing between academia and practice was not the building itself but the feedback loop it created. Teaching informed the project. The project, in turn, reshaped the teaching. This iterative exchange is where real progress occurs.

If the property and construction profession is to advance meaningfully, it should narrow the gap between those who theorise and those who deliver. The goal is not to eliminate the distinction but to ensure that each continually informs and challenges the other.

As for the case study itself, can we say that we developed a sustainable home? After much analysis, by colleagues and hundreds of students, we think that a ‘highly energy efficient (8.4 Stars) and MORE sustainable’ home is the best description. The home now sits on its site as great example of how a typical Australia house which is built with standard materials and building processes can be more sustainable than most of the homes currently being built. It also sits in the teaching in education as a case study of housing where students can see a range of great sustainable initiatives already in place yet also contemplate possibilities for further improvements. These insights can be directive in their careers for years to come.

By Tom Keel, Lecturer in Property, Real Estate and Sustainable Building at Deakin University

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