It’s pretty big, from UBS:
Non-mining business investment has been relatively weak since the GFC, with its current 9% share of nominal GDP near the lowest on record (Figure 2), and real activity showing no (net) growth in the last 6 years (Figure 3). Indeed, construction and capex ‘partial data’ showed a (largely unexpected) sharp drop in Q3-16.
However, the key leading indicator of private non-residential building approvals spiked in recent months to a record high (albeit still only ~1% of GDP, vs dwelling investment near ~6% of GDP), its best uptrend since the GFC (Figure 1). Given its strong causality to non-residential building investment – a significant 21% of total capex, but still the ~same level as its pre-GFC peak (Figure 4) – this suggests activity should rebound sharply in coming quarters (post a likely drop in Q3-16). Within non-residential approvals, there is broad improvement over recent months. Notably, commercial property (the largest sub-category) also finally rose, after being stuck near the same value as a decade ago (Figure 5). Indeed, even offices edged up, albeit still only ~half the pre-GFC peak. (In contrast, residential approvals peaked.) By State, approvals lifted most in NSW & Victoria (Figure 6).