How to Choose the Right Size Digger for Your Hawke’s Bay Project

Autumn is one of the busiest hiring seasons in Hawke’s Bay. Summer jobs are wrapping up, drainage work is picking up ahead of winter, and contractors are getting their sites levelled and prepped before the wet months arrive. For most of those jobs, an excavator is the machine doing the heavy lifting, but getting the size right from the start makes a real difference to how quickly and cost-effectively the work gets done.

This guide is built around project types, not machine specs. If you want a side-by-side comparison of individual Yanmar models, we have those too. But if your question is ‘what size digger do I actually need for this job?’, this is where to start.

The Question That Changes Everything: What Are You Actually Digging?

Before anything else, you need to be clear on what the machine needs to do. Digger size affects dig depth, bucket capacity, reach, ground pressure, and how much the machine can lift, all of which translate directly into how long your job takes and what it costs.

Most Hawke’s Bay projects fit into one of five categories. Here’s how to match your project to the right size range.

Residential Landscaping, Garden Work, and Tight Access Jobs

If you’re working on a residential property, digging out a garden, installing a retaining wall, removing tree stumps, or levelling a section, a mini excavator in the 1.7T to 2T range is almost always the right call.

These machines are compact enough to get through a standard gate, light enough to sit on driveways without cracking them, and easy enough for an inexperienced operator to use productively. The 1.7T Yanmar comes on its own trailer so you can tow it with a ute, which removes the transport complexity entirely.

The 2T Yanmar is the step up, a little more power and bucket capacity, still trailer-ready, and better on slightly harder ground. If you’re not sure whether you need the 1.7T or 2T, the difference often comes down to ground hardness and whether you need a bit more reach to work back from the machine.

Best for: residential landscaping, garden beds, narrow access, light drainage work, post-hole preparation near structures.

Drainage, Trenching, and Utility Work

Drainage and trenching work in Hawke’s Bay tends to ramp up in March and April as contractors prepare for winter. For this type of work, the key variable is trench depth. A shallow stormwater trench of 600–800mm can be done efficiently with a 2T or 3.5T machine. Once you’re going deeper than 1m, for sewer connections, subsoil drainage, or deeper stormwater, you want to step up to a 3.5T or 5.5T to get the reach and bucket clearance to dig cleanly and dispose of spoil effectively.

The 3.5T Yanmar is one of the most popular machines in the Allways Hire fleet for exactly this kind of work. It’s big enough to be productive on drainage projects, but compact enough to work in suburban streets and residential sites without becoming a liability.

If you’re running pipe from a property boundary back to the road and the trench needs to be 1.2 – 1.5m deep, the 3.5T is the default choice for most Hawke’s Bay contractors. For larger infrastructure drainage, culverts, main-line stormwater, deep soakage fields, the 5.5T gives you the additional depth and disposal reach you need.

Best for: stormwater and subsoil drainage, utility trenching, sewer and water connections, drain relaying.

Foundation and Slab Preparation

New builds and extensions require accurate, well-controlled excavation. Foundation work is less about raw digging power and more about precision, getting depths consistent, corners square, and spoil positioned cleanly.

A 3.5T digger handles most residential foundation work well, particularly on sections with reasonable access. For a full slab on a new home, you want enough bucket width to work efficiently without taking too many passes, which is where the 5.5T starts to earn its place.

On larger commercial foundation jobs, or where you’re stripping topsoil across a wider area before establishing levels, the 8T Yanmar delivers significantly higher productivity. The bigger bucket means fewer passes, and the additional weight gives better performance in the clay-heavy soils common in parts of the Heretaunga Plains.

Best for: residential foundations (3.5T–5.5T), commercial slab prep (5.5T–8T), topsoil stripping before building (5.5T+).

Roading, Earthworks, and Site Clearing

For roading maintenance, site clearing, and earthworks, productivity per hour starts to matter a lot more. A 5.5T machine on a roading cut will take significantly longer than a 10T or 13T, and on bigger earthworks, the additional hire days quickly outweigh the lower daily hire rate of a smaller machine.

The 8T Yanmar is the workhorse at this scale, capable enough for medium earthworks and most roading prep jobs, while still being manageable for two-person teams on regional projects.

The 10T Yanmar and the 13T Hitachi and Case machines are the right choice when volume is the primary concern, bulk excavation, major roading cuts, large-scale site stripping, or any job where you’re moving serious amounts of material and time is money. These machines need more space to operate and require a Class 4 truck for transport, so confirm your site access before you book.

Best for: roading maintenance (8T–10T), bulk earthworks (10T–13T), large site clearing (10T+).

Orchard and Farm Work

Hawke’s Bay’s horticulture sector has its own digger needs. Post installation, block preparation, irrigation trenching, and drain cleaning in orchard environments typically favour the 3.5T to 5.5T range, enough power to work through rootzone soil and handle the occasional hard clay subsoil, while still being manoeuvrable between tree rows.

If you’re working between established rows with limited overhead clearance, check the machine height before you book. The Allways Hire team can advise on which machines fit tighter row spacing or lower canopy situations.

Best for: orchard irrigation trenching, drain cleaning, post installation, block preparation (3.5T–5.5T typically).

Five Questions to Ask Before You Book

1. How deep do I need to dig? Under 1m: 1.7T–3.5T. 1–1.5m: 3.5T–5.5T. Over 1.5m: 5.5T+.
2. How wide is my site access? Gate under 1m: 1.7T. Gate 1–1.5m: 2T–3.5T. Open access: any size.
3. How hard is the ground? Soft or loamy: smaller machines work well. Hard clay or compacted fill: step up a size.
4. How much volume am I moving? More volume = larger machine saves time and money overall.
5. Do I have an experienced operator? If not, smaller is easier to manage. Our team can advise on the right fit.

Talk to the Allways Hire Team

Our team have seen most project types across Hawke’s Bay and can usually tell you within a couple of minutes which machine will work best for your job. Call our Hastings branch on 06 872 6774 or our Napier branch on 06 651 5050, and we’ll get you sorted with the right digger for the job, hire-ready and available when you need it.