Are Cheap Building Certifiers Worth the Risk?

You’ve got quotes from three certifiers. One is noticeably cheaper than the others. Naturally, you’re tempted. But before you sign on the dotted line, it’s worth understanding what a low-cost certifier might be cutting to offer that price, and what it could cost you if things go wrong.

This guide explains the real risks of choosing a certifier based on price alone, what certifiers can be held liable for, and how to tell the difference between good value and a false economy.

What do cheap building certifiers cut to lower their fees?

There are only a few ways a certifier can significantly reduce their fees. The certification process itself is defined by legislation: plan assessment, six mandatory inspections, certificate issuance, and documentation. You cannot legally skip any of these steps. So when a certifier charges substantially less than the market rate, something in how they deliver those steps is being reduced.

The most common shortcuts:

• Photo-based inspections instead of attending site: Instead of physically attending each of the six mandatory critical stage inspections, the certifier asks the builder to send photos. This is the single biggest corner that gets cut. A photo cannot show what is behind a wall, under a slab, or beneath a waterproofing membrane. It cannot verify that reinforcement is correctly placed, that soil conditions match the engineering assumptions, or that waterproofing was applied to the right number of coats.
• Minimal plan review: Instead of thoroughly reviewing plans against the National Construction Code (NCC) and conditions of consent, the certifier does a surface-level check. Non-compliance issues that should be caught at the plan stage only emerge during construction, when fixing them is far more expensive.
• Limited availability and communication: The certifier takes on a high volume of work to compensate for low per-project fees. That means longer response times, difficulty getting questions answered, and delays in scheduling inspections.
• No proactive compliance checks: A thorough certifier looks beyond the minimum requirements. For example, checking soil classification before foundation work (which prevents structural failures) or verifying waterproofing application standards (three coats is best practice, even where two meets the minimum). A cheap certifier ticks boxes rather than looking for potential issues.

What can actually go wrong if a certifier cuts corners?

The consequences of poor certification are not theoretical. They happen regularly across NSW, and the costs are significant.

Structural failures from inadequate soil testing

In some areas of Western Sydney, houses have experienced serious structural cracking and sinking because the foundation work did not account for reactive soil conditions. When a certifier does not verify that soil classification testing has been conducted before foundation work begins, the risk of structural failure increases dramatically. The cost of underpinning a house with foundation problems can run to tens of thousands of dollars, and in severe cases the damage is irreparable.

Waterproofing failures

Wet areas (bathrooms, laundries, balconies) require waterproofing membrane to be applied before tiling. The NCC requires a minimum of two coats, though three coats is recognised as best practice. If the certifier does not attend the waterproofing inspection in person, they cannot verify the number of coats, the application quality, or whether the membrane was properly lapped at junctions and penetrations. The result: leaks that appear months after completion, often causing damage to hallways, lower levels, or neighbouring properties. By the time the leak is visible, the tiles are laid, and the only fix is to strip everything out and start again.

Delays and cost blowouts

A certifier who is slow to respond, difficult to schedule, or inconsistent in their requirements can cause weeks or months of delays. Most residential builds are loan-funded. A delay of eight weeks on a $500,000 loan at 5% interest costs approximately $3,800 in additional interest alone. Add potential material price escalations and lost rental income for investors, and the cost of a “cheap” certifier quickly exceeds the fee difference.

Unapproved work and demolition orders

If a certifier signs off on work that does not comply with the approved plans or building standards, council can order rectification or demolition of the non-compliant work. Council uses aerial monitoring (satellite and drone imagery) to detect unapproved structures, and they actively investigate discrepancies. The cost of demolishing and rebuilding non-compliant work dwarfs any saving on certification fees.

Can a building certifier be held liable for mistakes?

Yes. Building certifiers in NSW carry legal obligations under the Building and Development Certifiers Act 2018 and the Environmental Planning and Assessment Act 1979. If a certifier fails to properly perform their duties, they face multiple forms of accountability:

Regulatory penalties

Building Commission NSW conducts risk-based audits under Section 106 of the BD&C Act. In 2025, Building Commission inspectors visited over 850 building sites across NSW (Building Commission NSW, 2025). Certifiers who fail to comply with audit requirements or obstruct investigations face fines of up to $110,000 for companies or $22,000 for individuals (BD&C Act 2018, Sections 91-92). Penalties can also include conditions on registration, suspension, or cancellation.

Professional indemnity claims

All registered certifiers must carry professional indemnity insurance. If a certifier’s negligence causes financial loss (for example, approving non-compliant work that later requires expensive rectification), the property owner can make a claim against the certifier’s insurance. These claims can be complex, but the liability pathway exists.

Loss of registration

Serious or repeated failures can result in a certifier losing their registration entirely. This ends their ability to practice and is the most severe professional consequence.

What happens if your building certifier makes a mistake?

If your certifier makes a mistake during the certification process, the consequences depend on the nature and timing of the error:

• Error caught during construction: If the certifier identifies a compliance issue during an inspection, the issue can usually be rectified before the next stage of work proceeds. This is the system working as intended. The cost of fixing an issue at the inspection stage is always less than fixing it after the building is complete.
• Error missed during inspection: If the certifier misses a compliance issue and work continues, the cost of rectification increases with each stage. A waterproofing issue missed before tiling requires the tiles to be removed. A foundation issue missed before the slab is poured may require underpinning the entire structure.
• Error discovered after the Occupation Certificate is issued: This is the worst scenario. The building has been signed off as compliant, but a defect emerges during occupation. At this point, you are relying on statutory warranties (6 years for major defects, 2 years for other defects under the Home Building Act 1989), the Home Building Compensation Fund (HBCF, capped at $340,000 per dwelling), and potentially legal action against the builder and/or certifier.

The key point: a thorough certifier catches problems early, when they are cheapest and simplest to fix. A certifier who cuts corners misses those problems, and the cost of rectification compounds at every subsequent stage.

How do you tell a good-value certifier from a cheap one?

Price alone does not tell you whether a certifier is good value or a liability. Here is how to tell the difference:

• Ask for an itemised quote. A good certifier breaks down their fee into components: plan assessment, inspections, certificate issuance, documentation. A cheap certifier gives you a single number with no breakdown.
• Ask about inspection attendance. “Do you attend all six mandatory inspections in person?” If the answer is anything other than yes, that’s your signal. Any certifier who routinely accepts photos from builders is reducing their service to lower their price.
• Ask what happens if they find an issue. A good certifier explains the process: they identify the issue, explain what needs to change, and work with you and the builder to resolve it. A cheap certifier may avoid finding issues altogether because identifying problems creates work they haven’t priced for.
• Check their communication style. Call them with a question. How quickly do they respond? Do they explain things clearly? If they are difficult to reach before you’ve even engaged them, imagine how responsive they will be mid-project when you need an urgent inspection.

For a comprehensive evaluation framework, see our guide to choosing a building certifier in Sydney. For a comparison of certifiers operating in Sydney, see our top 10 building certifiers list.

Is it worth paying more for a building certifier?

In almost every case, yes. The fee difference between a cheap certifier and a thorough one is usually a few hundred to a couple of thousand dollars. The cost difference if something goes wrong is orders of magnitude higher.

Consider the maths: if a cheap certifier saves you $1,000 on their fee but misses a waterproofing issue that costs $15,000 to rectify, that’s a net loss of $14,000. If they cause a two-month delay that adds $3,800 in loan interest and $2,000 in material escalation, you’ve lost $5,800 before the build is even finished.

A certifier who charges a fair fee and delivers thorough service is not an expense. They are a form of insurance against the far larger costs of non-compliance, delays, and hidden defects. The cheapest certifier is rarely the best value.

Key takeaways

• Cheap certifiers reduce their fees by cutting corners on inspections (accepting photos instead of attending site), plan review depth, communication, and proactive compliance checks.
• The consequences of poor certification include structural failures, waterproofing defects, costly delays, and council demolition orders.
• Building certifiers can be held liable for negligence through regulatory penalties (up to $110,000), professional indemnity claims, and loss of registration.
• The fee difference between a cheap and thorough certifier is typically a few hundred to a couple of thousand dollars. The cost difference if something goes wrong can be tens of thousands.
• Always ask for an itemised quote and confirm that the certifier attends all six mandatory inspections in person. These two questions will tell you more than the price alone.
• The choice of certifier is yours, not your builder’s. Independence is essential to proper compliance oversight.

Saving money on certification sounds appealing. But the cheapest certifier often delivers the most expensive outcome. Choose based on value, not price.