Choosing the wrong excavator size is one of the most common and costly mistakes on Sydney job sites. Too small and you're making twice as many passes, burning twice the time. Too large and you can't fit through the access, or you're paying for power you don't need. This guide cuts through the confusion with a direct job-type-to-machine match for every common Sydney project.
The Quick Reference Table
| Job Type | Recommended Machine | Rate from |
|---|---|---|
| Tight access — side passage, narrow gate | 0.8T Mini | $200/day |
| Garden beds, small drainage, planting | 1T Mini | $200/day |
| Residential footings, small retaining walls | 1.7T Mini | $205/day |
| Bulk earthworks, site prep, house demolition | 3.5T | $340/day |
| Pool excavation, deeper footings, drainage | 5.5T | $370/day |
| Basement excavation, civil infrastructure | 8T | Coming soon |
| Large commercial earthworks, major development | 14.5T | $490/day |
Mini Excavators (0.8T – 1.7T): Tight Access and Residential Work
BuildHire's three mini excavators, the 0.8T, 1T and 1.7T, are designed for jobs where access is the primary constraint. The 0.8T pulls its tracks in to about 680mm, so it fits through a standard side passage gate. The 1.7T is the most popular machine in this range: it handles residential footings, small retaining walls, garden drainage, and light earthworks with a 2,210mm dig depth and 1,785kg operating weight that keeps it manageable on soft residential ground.
The rule of thumb: if your access point is under 900mm wide, start with the 0.8T. If your access is wider than about 950mm (the 1.7T with its tracks pulled in) and your job involves earthworks rather than just planting or drainage, step up to the 1.7T.
3.5T: The Residential Workhorse
The 3.5T Yanmar ViO35-7 is BuildHire's most-booked machine. It handles the full range of residential earthworks — bulk stripping, site preparation, house demolition, deep trenching, and commercial landscaping — with a 3,250mm dig depth and 18.9kW engine. At $340/day, it is the most cost-effective choice for jobs that exceed the 1.7T's capacity but don't require the power of the 5.5T.
The 3.5T is the right choice when: your job involves moving more than 20m³ of material, you need to dig deeper than 1,800mm, or you're working on a commercial landscaping or site prep project where the 1.7T would be too slow.
5.5T: Pool Excavation and Deeper Footings
The 5.5T is the standard choice for pool excavation in Sydney. A standard 8m × 4m residential pool requires approximately 50–60m³ of excavation — the 5.5T's 0.16m³ bucket and 33.4kW engine completes this in a single day for most sites. The 3,900mm dig depth also makes it the right choice for footings deeper than 900mm and drainage trenching where the 3.5T's 3,250mm limit falls short.
8T and Above: Commercial and Civil Projects
Once you move above 5.5T, you're in commercial and civil territory. The 14.5T Case CX145C is our largest machine, for large commercial developments, civil infrastructure and major earthworks. The 8T (4,400mm dig depth, 0.28m³ bucket) is coming soon, for basement excavation, major drainage and subdivision earthworks.
Not Sure? Call Us
If you're unsure which machine is right for your job, call BuildHire on 1300 157 882. We'll ask three questions — job type, access width, and dig depth — and give you a straight answer. We'd rather you book the right machine than the most expensive one.
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Frequently Asked Questions
What size excavator do I need for a pool?
A 5.5T excavator is the most common choice for standard residential pool excavation in Sydney (8m × 4m). For larger pools or difficult access, a 3.5T may be used in tight spaces. The 5.5T provides the digging depth (3,900mm), bucket capacity (0.16m³), and power to complete a standard pool excavation efficiently.
What size excavator do I need for a house footing?
For standard residential footings (600mm wide, up to 900mm deep), a 1.7T or 3.5T mini excavator is sufficient. For deeper footings over 900mm or wider than 600mm, a 5.5T provides the extra reach and power needed.
What size excavator do I need for landscaping?
For residential landscaping — retaining walls, garden beds, drainage, and small earthworks — a 1T or 1.7T mini excavator is ideal. For larger landscaping jobs with significant earthmoving, a 3.5T or 5.5T is more productive.