1. How Much Reduction You Want
AS 4373 caps single-visit reduction at about 25% of the live canopy — anything larger is staged over 2–3 visits to protect tree health. A 15% reduction is cheaper and quicker than a 25% one; larger reductions get priced as multi-visit.
2. Access
Front-yard trees with driveway access are cheapest. Rear-yard trees behind side gates need branches walked out, adding crew time. If the gate is narrow, the chipper stays on the street and hoses run through — small logistical add.
3. Climbing vs EWP
Climbing is cheaper than EWP hire when the tree's branch structure supports it. EWP is safer and quicker for brittle or over-structure trees but adds a base hire cost. We flag on the quote which method the job needs.
4. What's Below
Cuts over a lawn are quick. Cuts over a house, pool, shed, glasshouse or neighbour's property require controlled rigging — adds crew time and gear. On the largest jobs, cuts over structures push the quote to the top of the very-large band.