Why guarantees matter when hiring an earthmover
Earthmoving work can look straightforward from the outside, but mistakes are expensive to fix. A trench that is the wrong depth, poor compaction under a driveway, or damaged underground services can lead to subsidence, drainage problems, delayed building work, or repair bills that quickly run into the thousands. That is why it is worth asking any earthmover what guarantees and warranties they offer before the job starts.
In New Zealand, a good earthmover should be prepared to stand behind both their workmanship and any materials or products they supply. They should also understand how their obligations sit alongside your rights under the Consumer Guarantees Act 1993 (CGA).
The three types of protection you should look for
When comparing earthmoving quotes, it helps to separate protection into three buckets:
| Type of protection | What it covers | Who provides it | What to check | |---|---|---|---| | Workmanship guarantee | The quality of the earthworks and how they were carried out | The earthmover | Length of guarantee, exclusions, and what counts as a defect | | Product or materials warranty | Imported fill, geotextile, drainage products, retaining materials, or machinery parts supplied by the contractor | The manufacturer, supplier, or earthmover | Warranty terms, proof of purchase, transferability | | Consumer Guarantees Act rights | Services must be carried out with reasonable care and skill, and materials must be fit for purpose | The trader by law | Applies even if the contract does not mention a guarantee |
A written guarantee is useful, but it does not replace your legal rights. Under the CGA, a contractor cannot simply opt out of providing services with reasonable care and skill.
What a workmanship guarantee should cover
A workmanship guarantee is the contractor’s promise that the earthworks were completed properly. For most residential jobs, this should be in writing and clearly state what the contractor will fix if their work fails.
A useful workmanship guarantee for earthmoving should address:
- **Excavation levels and grades**: trenches, pads, cut-and-fill areas, driveways, paths, and building platforms should meet the agreed levels and slopes. - **Compaction and stability**: fill should be compacted appropriately for the intended use, whether that is a lawn, driveway, slab, retaining wall footing, or access track. - **Drainage performance**: swales, soak pits, drains, and surface falls should move water as designed, not create ponding or erosion. - **Protection of existing structures**: the contractor should avoid damaging fences, services, driveways, neighbouring property, and landscaped areas unless damage was discussed and accepted. - **Reinstatement**: disturbed ground, berms, and accessways should be left as agreed, including topsoil spread, tidying, and temporary protection where needed.
A workmanship guarantee is only meaningful if it says what the contractor will do if the work is faulty. Ideally, it should state whether they will:
- return and repair the issue at no extra cost; - reimburse reasonable repair costs if they are unable to return in a timely way; - cover reinstatement costs for affected areas.
What product warranties may apply
Earthmovers often supply products as part of the job. Examples include drainage pipe, geotextile fabric, retaining wall components, concrete aggregates, compacted GAP, edging, and sometimes imported machinery components or attachments.
Product warranties are different from workmanship guarantees. A product may fail because it is defective, while the installation may still be fine. Or the material may be sound, but the contractor installed it incorrectly.
Ask who is supplying the product and what warranty applies. A proper quote should state:
- the brand or type of product being used; - whether the earthmover or homeowner is the purchaser; - the warranty period; - any conditions, such as correct installation or maintenance; - what paperwork will be provided, such as batch numbers, delivery dockets, or supplier invoices.
For example, if a drain is laid with an approved pipe but it collapses because it was not bedded correctly, that is likely a workmanship issue. If the pipe itself was defective from manufacture, the supplier warranty may be relevant as well.
How the Consumer Guarantees Act protects homeowners
The Consumer Guarantees Act is one of the most important protections for homeowners hiring an earthmover in New Zealand. It applies when you buy services from a trader for personal, domestic, or household use.
For earthmoving work, the key CGA guarantees are that the services will be:
- carried out with reasonable care and skill; - fit for a particular purpose if you told the contractor what you needed and relied on their expertise; - completed within a reasonable time if no time frame was agreed; - supplied for a reasonable price if no price was set.
The CGA also covers goods supplied with the service, such as materials and products.
A contractor cannot contract out of the CGA for ordinary residential work. If the earthmover’s terms try to remove your consumer rights, that may not be enforceable.
What counts as faulty earthmoving work
Faulty work is not just a job that looks untidy. In earthworks, defects can show up later, sometimes after rain or after the site is loaded.
Common examples include:
- trenches that are the wrong depth or fall the wrong way; - poor compaction causing settlement under a driveway or slab; - fill that is unsuitable for the intended use; - drainage installed without enough fall or outlet capacity; - excavations that damage services, foundations, or trees without warning; - insufficient erosion and sediment control, leading to run-off or silt build-up; - unsafe batter angles or unstable slopes; - failure to obtain utility locate information before digging.
If the work affects a building platform, retaining wall, stormwater disposal, or vehicle access, the consequences can be serious. That is why checking the guarantee terms before work starts is so important.
Questions to ask before you sign a quote
A good earthmover will not mind being asked about guarantees. In fact, a professional contractor should expect it.
Ask these questions in writing:
- How long is your workmanship guarantee? - What exactly is covered and what is excluded? - If there is a defect, will you return and fix it at no cost? - What products or materials are covered by manufacturer warranties? - Will you provide supplier details and receipts for materials? - Do you carry public liability insurance, and what amount of cover do you have? - Have you checked for underground services before excavation? - Do you handle any council consent or engineering requirements, or do I need to organise them? - Who is responsible if the site conditions turn out to be different from what was expected?
You should also ask for a written scope that describes the job clearly. That scope should include levels, cut/fill volumes, compaction standard, drainage details, spoil removal, access arrangements, and any reinstatement.
When council consent or other approvals may matter
Not all earthmoving work needs a building consent, but some projects do. If the earthworks are part of building work, retaining walls, foundations, drainage structures, or other work requiring consent, the local council may need to approve it.
A careful earthmover should be able to tell you when you may need to involve:
- your local council building consent team; - a geotechnical or structural engineer; - a drainage designer; - utility providers for locate information.
If the work includes plumbing, gasfitting, drainlaying, or electrical connections, those are restricted or regulated trades and must be done by appropriately authorised people. Earthmovers often work alongside other trades, so make sure the boundaries of each contractor’s responsibility are clear.
How guarantee terms should be written
A verbal promise is not enough. Ask for a written guarantee attached to the quote or contract. It should be plain English and avoid vague language such as “workmanship guaranteed” without details.
A practical guarantee document should include:
- the contractor’s legal name and contact details; - the address of the property; - the exact works covered; - the start and completion dates; - the guarantee period; - exclusions, such as damage caused by later excavation, flooding, earthquakes, subsidence from outside the contractor’s control, or unauthorised modifications; - how to notify the contractor of a problem; - expected response time for repairs; - whether the contractor will repair, replace, refund, or compensate.
Be wary of guarantees that are so narrow they only cover defects noticed within a few days. Many earthworks problems appear after the first big rain or once the ground has been loaded with a vehicle, shed, or slab.
What to do if the earthworks turn out to be faulty
If you discover a problem, act promptly and keep good records.
1. Document the issue
Take photos or short videos, note dates, and keep copies of the quote, invoice, texts, emails, and any marked-up site plan. If there is movement, ponding, cracking, or drainage failure, record when it first appeared and what weather occurred beforehand.
2. Notify the contractor quickly
Write to the earthmover and describe the defect clearly. Ask for a site visit and propose a timeframe for response. Keep the message factual and calm.
3. Give them a fair chance to fix it
Under the CGA, the supplier should generally be given the opportunity to remedy the problem. For a minor issue, that may mean regrading, re-compacting, or correcting drainage.
4. If they do not fix it, escalate
If the contractor refuses, delays unreasonably, or says the issue is not theirs when it likely is, you can seek advice from the Citizens Advice Bureau, your local Community Law Centre, or a dispute resolution service. For larger disputes, the Disputes Tribunal may be an option if the claim fits within its jurisdiction.
5. Consider independent evidence
For expensive or technical jobs, an independent engineer, surveyor, or experienced earthworks professional may help identify whether the problem is workmanship-related, materials-related, or due to site conditions.
Your recourse if the work is seriously defective
Your options depend on how serious the problem is.
If the fault is minor, the contractor may be able to put it right. If the work is substantially faulty and cannot be fixed within a reasonable time, you may be able to reject the services or seek compensation for the cost of having the work corrected elsewhere.
Possible outcomes include:
- the contractor returns to repair the defect; - the contractor reimburses reasonable repair costs; - a partial refund if some of the work was not delivered as promised; - compensation for consequential damage, where appropriate and supported by evidence.
Keep in mind that your right to compensation will depend on the facts, including whether you contributed to the problem by changing the site after completion, ignoring maintenance requirements, or failing to get necessary consents or advice.
How to compare earthmover quotes properly
When you get multiple quotes, do not choose on price alone. Compare them on the protections offered as well as the scope.
Look for:
- a clear written guarantee; - evidence of public liability insurance; - references or examples of similar local work; - whether the contractor has the right equipment for the site; - clarity around spoil removal, drainage, compacting, and reinstatement; - whether they have allowed for wet-weather delays, which are common in many parts of New Zealand.
In the wetter months, poor scheduling can increase the risk of soft ground, rutting, and settlement. A contractor who explains how they will manage weather conditions is often worth more than the cheapest quote.
Bottom line
A reliable earthmover should offer more than a handshake promise. You should expect a written workmanship guarantee, clarity about product warranties, and a contractor who understands their obligations under the Consumer Guarantees Act. For residential work in New Zealand, your rights are not limited to what the contractor chooses to promise in the quote.
Before you hire, get multiple written quotes, check insurance and references, and make sure the scope, guarantees, and any consent-related responsibilities are clear. If something goes wrong, document it quickly and use your CGA rights to push for a proper remedy.