Ecological Constraints Assessment
An ecological constraints assessment, also called an ecological constraints report, a biodiversity constraints report, a preliminary assessment or a feasibility assessment, tells you the potential ecological constraints of a site as well as the possible biodiversity offset obligations that could be required upon approval. It maps vegetation, hollows and go/no-go zones early, so you have the numbers before you spend on approvals you can't undo.
When do you need one?
Before you commit to a design, and ideally before you sign a contract to buy the land. A constraints assessment is due diligence, not a formality. It tells you whether the site triggers the Biodiversity Offset Scheme, and roughly what that will cost, while you can still make changes to the plan. Two things trigger the scheme: the site sitting in a state-mapped area of high biodiversity value, or clearing native vegetation above the minimum lot size threshold.
What's included?
A constraints assessment is desktop-only, or desktop plus a site visit, depending on what the existing data can tell us. It isn't a Biodiversity Development Assessment Report, and it isn't submitted to council or the department. It's advice to you, before you've committed to anything.
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Across the whole site, not just the development footprint.
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Large hollows are what trigger the longest and most expensive fauna surveys later, so we check for them early.
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Confirms whether the site holds a threatened ecological community, which changes both the assessment and the likely offset cost.
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Picked up during the site visit, or already sitting in existing government data.
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Mapped against the two Biodiversity Offset Scheme triggers, so you know where you can and can't build.
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The number is on the table before you commit to a design, not after.
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The documented case for the steps you took to minimise biodiversity impacts on the project.
Frequently Asked Questions
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No. It's informal, early advice to you, not a document lodged with council or the department. It exists to inform your decision before you commit to a design, not to satisfy an approval requirement. The formal, submitted report, usually a BDAR, comes later, once the project's scope is locked in.
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It depends on what existing data already covers the site. A desktop assessment uses vegetation mapping and government datasets already available. We add a site visit where that data is thin, out of date, or where opportunistic species records would materially change the go/no-go picture.
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A constraints report is early, informal advice before you commit to a design, desktop-only or with a site visit, and isn't submitted anywhere. A Biodiversity Development Assessment Report (BDAR) is the full survey-backed report submitted to council or the department as part of your approval.
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No. Only developments that affect a state-mapped area of high biodiversity value, or that clear native vegetation above the minimum lot size threshold, need to enter the scheme. A preliminary assessment confirms which applies to your project.
Find out what your site will cost you
Tell us about your project and we can put together a plan that helps you understand the ecological constraints that apply so you can move forward with confidence.