The renewal gap doesn't stay still. Every year you defer renewal, it gets larger — and most councils are significantly underestimating it.
The renewal gap is the difference between what you should be spending on asset renewal each year — based on the age, condition, and remaining life of your assets — and what you're actually spending. For most NSW councils, that gap is real, material, and growing.
The standard calculation is simple: Annual Renewal Requirement (from your AMP, based on condition and remaining useful life) minus Actual Renewal Expenditure equals the gap.
But the figure most councils report — if they report it at all — understates the real position. Here's why.
Renewal requirement is often driven by depreciation, not condition
Depreciation tells you how an accountant values asset consumption. It doesn't tell you when an asset actually needs replacing. If your renewal modelling is built on straight-line depreciation rather than condition data and realistic remaining useful life, your requirement figure is likely wrong from the start.
Deferred renewal compounds
An asset that reaches end of life and isn't replaced doesn't hold its position — it deteriorates faster, costs more to maintain reactively, and eventually requires emergency intervention at a significantly higher unit rate. The cost of deferral isn't just the project you didn't do. It's the accelerated deterioration and emergency works that follow.
The LTFP link is direct
If your renewal gap is understated, your LTFP is modelling insufficient renewal expenditure. That flows into your infrastructure renewal ratio, your infrastructure backlog ratio, and your financial sustainability assessment. Councils heading into an IPART rate variation process with a materially understated renewal requirement are building the case on weak foundations.
Quantifying the renewal gap accurately requires current condition data, realistic remaining life estimates, and renewal modelling at the asset class level — not an aggregate depreciation line pulled from the financial statements.