Last updated September 2026
Most earthworks jobs that go wrong did not go wrong in the digging. They went wrong in the week before, when nobody checked whether the wall needed a consent, whether the truck could physically reach the site, or where two cubic metres of clay was going to end up. Here is what is worth settling first.
★View the Best Excavation Contractors in Nelson→Whether your retaining wall needs a consent
This is the one that catches people, because the rule has a second half that most people never hear.
A retaining wall is exempt from building consent if it retains no more than 1.5 metres depth of ground and carries no surcharge, meaning no additional load on top of the ground it is holding back. Both halves have to be true.
The second half is where exemptions fall over. A driveway above the wall is a surcharge. So is a building, a parked vehicle, or a neighbour’s vehicle crossing. Building Performance gives the example of a 1.2 metre wall built to form a level platform below a neighbour’s driveway: well under the height limit, still needs a consent, because the driveway loads it.
So “it is only a metre high” does not settle it. What is above it settles it.
Check before the work, not after. A wall built without a consent that needed one is a problem at sale time, and the fix is more expensive than the wall.
What is buried where you are about to dig
Power, gas, fibre and water do not announce themselves, and hitting one is dangerous as well as expensive to put right.
Underground services can be located before anyone digs, and on most residential jobs the contractor arranges it rather than the owner. The thing worth doing is asking who is handling it, because “I assumed you were” is how it gets missed.
Whatever plans come back, treat them as a guide rather than a guarantee. Depths shift over decades, private lines between a house and a shed are often on nobody’s records at all, and older rural properties are full of undocumented runs. Anything near a known service gets hand-dug rather than machine-dug.
Whether the machine can actually get in
Worth walking before you book, because the answer changes the machine and sometimes the price.
The things that decide it: the width of the narrowest gate or gap, overhead power lines and branches, how soft the ground is between the road and the work, whether there is anywhere for a truck to turn or reverse, and what the machine has to cross to get there. Lawns, drainage fields, new driveways and septic tanks all count as things you would rather not drive a loaded machine over.
If access is tight, say so when you ask for a quote instead of letting it be discovered on the day. It is the single most useful sentence in the conversation.
Where the spoil goes, and what is coming in
Every excavation produces a pile, and that pile has to go somewhere.
Decide early whether it stays on site to be levelled or spread, or whether it is leaving. Clay, topsoil and contaminated fill are not the same problem and do not cost the same to move. If it is leaving, that is truck movements to price in.
The same question runs the other way for anything coming in: metal, drainage scoria, topsoil or fill. A contractor who can bring material in and take waste out in the same visit saves you a second mobilisation, which is usually the bigger cost on a small job.
Ground conditions and the time of year
Nelson gets long dry spells and then serious rain, and the same site behaves like two different jobs depending on which one you are in.
Wet ground means machinery marks up lawns and driveways, batters slump, and trenches need more care. Very dry clay goes hard enough to slow digging noticeably. Neither is a reason not to do the work, but both change how long it takes.
Slip and flood repair is its own category here after the storms the region has had, and that work is usually urgent rather than scheduled. If you are dealing with a slip, get someone to look at it before deciding what you need, because the fix is often not what it looks like from the top.
Fencing and retaining are one job, not two
Post holes, retaining and fencing usually want to happen together and in a particular order, and doing them in the wrong order means digging the same ground twice.
An auger makes short work of post holes, including deeper ones with extensions, but only if the holes are set out before the machine is on site. Have the line agreed, the corners pegged, and the boundary confirmed. Boundary disputes discovered after the posts are in are unpleasant and expensive.
Questions worth asking when you get a quote
- Does what I am proposing need a building consent, and are you sure about the surcharge part?
- Who is locating the underground services before we start, you or me?
- What machine are you bringing, and will it fit through the access I have?
- Is spoil removal included, or priced separately?
- Can you bring in the material as well as take the waste away, in one visit?
Anyone who has done this a while will answer all five without having to go away and think about it.
Where Nelson Digger Hire fits
Nelson Digger Hire is owned and operated by Jeff Rooney, who has been in the construction and transport industry for over twenty years. It covers the Nelson Tasman region across rural, residential, farming and lifestyle properties.
On the points above, their setup answers a few of them directly. They run a digger, a tipper truck and an auger with extensions, which is the combination that lets material come in and waste go out on the same visit rather than paying to bring machinery back. Their work covers flood clean up, fencing and retaining, earthmoving, and materials in and waste out, which is why the fencing and retaining sequencing above is a single conversation rather than two contractors. Quotes are free and there is no obligation, so the access walk-through costs you nothing.
Whoever you use, settle the consent question first, and know who is locating the services before a bucket goes in the ground. Everything else on the list can be solved on the day. Those two cannot.
