Two new houses in a masterplanned estate in South East Queensland now sit close enough that a tennis ball will not pass between them. The gutters nearly touch. Tradesmen working on one roof have found themselves standing on the other.

Both houses were approved. Both were inspected at every mandatory stage. Both were signed off by licensed professionals doing the job the law asks of them.

The temptation is to look for the person who got it wrong. That search will not turn up much, because the more you follow the paper trail the clearer it becomes that this outcome did not require anyone to fail. It required four separate rulebooks, written by four different bodies at four different times, none of which is obliged to check what the others say.

Four rulebooks, one distance

Start with the question a builder actually asks. How far off the boundary does this wall have to sit?

There is no single answer, because there is no single rule.

The National Construction Code has something to say. Under the Housing Provisions, an external wall of a house must be fire-resisting if it sits less than 900mm from an allotment boundary, or less than 1.8 metres from another building on the same lot. Notice what that does and does not do. It does not stop anyone building to the boundary. It changes how the wall must be built if they do.

Above that sits the Queensland Development Code. For a house on a lot under 450 square metres the relevant part is MP 1.1, and for lots of 450 square metres and over it is MP 1.2. These deal with clearances, site cover and height, and under section 30 of the Building Act 1975 the code forms part of what a certifier assesses against, subject to section 33.

Section 33 is the third rulebook. It lets a council write its own alternative provisions that displace the code design and siting rules, but only through a planning scheme or a priority development area instrument, and only where those provisions take the form of a qualitative statement or a quantifiable standard. Where alternatives exist, the state code applies only to the extent they do not.

Then there is the fourth. In a masterplanned estate, the development approval given to the developer usually carries a plan of development. This is not a code at all. It is a lot by lot document, nominating which specific blocks may build to a boundary and which may not, along with envelopes and siting controls. It can be stricter than everything beneath it, and it is the only one of the four written for that particular piece of dirt.

The code was never really the problem

None of that would matter much if the four layers were roughly aligned. They are not, and the Queensland Government has been unusually blunt about it.

In releasing the new statewide Housing Code this year, the government noted that the design and siting provisions of the Queensland Development Code have remained largely unchanged since 2010, and that as a result around three quarters of Queensland councils now apply different housing requirements. Detached houses make up more than seventy per cent of new homes built in the state. The Property Council has pointed out that Queensland has been the only state without a single housing code, which adds complexity for anyone trying to build across different local government areas.

So the picture, before an estate document is even added, is a fifteen year old state standard with seventy seven councils layering their own variations across it.

The new Housing Code sets consistent statewide standards for height, setbacks, privacy, car parking, site cover and private open space. Councils can begin adopting it during a three year transition period commencing 1 September 2026, with the separate Modern Homes Standards amendments proposed to commence on 14 August 2026.

That fixes the middle of the stack. It does not touch the top of it. A plan of development is site specific by design and will keep sitting above whatever the statewide position becomes.

The one document that mattered most is the one nobody has to look for

Here is where it gets genuinely strange.

Section 30 of the Building Act lists what building work is assessed against. It names the Building Code of Australia, the Queensland Development Code, the fire safety standard, regulations under the Act, and any relevant local law or planning instrument made under sections 32 or 33.

A plan of development is not on that list. It is not a code and not a planning instrument. It is a condition sitting inside somebody else’s development approval.

It binds anyway, through a different door. Section 84 says a private certifier must not approve a building development application where it relates to an unlapsed earlier development approval given by the local government and is inconsistent with it. The maximum penalty is 165 penalty units, a little over $28,000 at the penalty unit value of $172.70 that took effect on 1 July.

So the obligation is real and it is enforceable. But it lives in a different section, under a different heading, and it points at a document that is not in the list a certifier works from. That is a peculiar corner of the licensing and compliance framework, and it is entirely possible to satisfy every rulebook a certifier is handed and still breach the one that governs the lot.

The check that would settle it in an afternoon is optional

There is a tool built for exactly this. It is called an identification survey, a cadastral survey showing where the boundaries actually are and where buildings actually sit.

Section 58 of the Building Act says a certifier may require one before assessing an application. Section 78 says an approval may include a condition that the certifier be given one showing the real location of the building once that can be established.

May. Not must. Twice.

On a block where the difference between compliant and non compliant is measured in centimetres, the single check that would resolve it is discretionary at the design stage and discretionary again during construction.

The inspections are real, and they check the wrong thing

Queensland does not run an honour system. Under the Building Regulation 2021, a detached house must be inspected after excavation and before footings or slab concrete is poured, at the footings stage, at the slab stage, at the frame stage, and at completion. The approval itself can add further stages on top.

Boundaries are taken seriously inside that framework. A certifier cannot appoint just anyone to help with boundary clearance work on a house. Under section 35 of the regulation that person must be a cadastral surveyor, and an aspect certificate for boundary clearances cannot be given by anybody else.

Which sounds like a solid safeguard, right up until you read what the certificate actually says.

What it confirms is that the work has been completed and complies with the building development approval. The inspection regime tests whether the house matches its approval. Nothing in it tests whether the approval matched the plan of development.

If the approval was wrong on day one, every inspection that follows will confirm, accurately and in good faith, that the building is exactly where the paperwork says it should be. The chain is internally flawless and externally wrong, and it stays that way through to final.

By the time anyone outside notices, the concrete has cured

A house in an approved residential estate is code assessable development. Under section 53 of the Planning Act 2016, an applicant only has to publicly notify an application where part of it requires impact assessment or it includes a variation request.

Neither applies. So there is no notification, no plans on display, and no mechanism for anyone next door to say anything even if they wanted to.

There are decent arguments for that. Notifying every neighbour of every house in a four thousand lot estate would add cost and delay to the exact product the country is short of. The consequence is simply that the first check from outside the process happens when the frames go up and somebody looks over the fence.

And then the system does the only thing left to it

Once a breach surfaces, a council has two tools and is compelled to use neither.

Section 168 of the Planning Act allows an enforcement notice where the authority reasonably believes a development offence has been committed. The Act’s own examples include requiring someone to demolish or remove development, or restore the site as far as practicable. The word is may.

The other tool is a change application. Where a change is a minor change, meaning it would not result in substantially different development, the responsible entity assesses and decides it, generally within 20 business days where no affected entity is involved. There is no public notification. If the assessment concludes the reduced setback still achieves the intended planning objectives, the built position becomes lawful.

That is not a loophole. It is the ordinary mechanism for changing an approval, used constantly for uncontroversial things. It just also works after the slab has cured, and by then demolition is the expensive option for everyone holding a pen.

The neighbour, meanwhile, has almost nothing. Schedule 1 of the Planning Act gives change application appeal rights to the applicant and to entities with a formal referral role. Submitters can appeal, but only where the application required impact assessment or involved a variation request. Code assessable development is not notified, so there are no submissions, so there are no submitters, so there is no appeal. Appeal rights in Queensland hang off submission rights, and the development most likely to affect the person next door is the development least likely to give them a voice.

One door stays open. Section 11 of the Planning and Environment Court Act 2016 lets any person seek a declaration about the lawfulness of development. Genuinely any person. It is also a court, which puts it at the formal and expensive end of how building disputes get resolved rather than the accessible end.

The governments already know

It would be easy to write this as a Queensland problem. It is not.

In New South Wales, the second reading speech for the Building (Approvals and Practitioners) Bill 2026 described the existing system of building design and certification as fragmented and ad hoc, and pitched the replacement as a single coherent framework. That Bill was introduced on 6 May 2026, passed the Legislative Assembly on 28 May and is currently before the Legislative Council. Among other things it proposes lifting the maximum court imposed penalty for a certifier conflict of interest breach from $33,000 to $1.1 million, with automatic suspension on conviction. These are the certifier reforms moving through New South Wales, and they are a response to the same underlying diagnosis.

Queensland reached a version of that diagnosis a long time ago. The review of the Building Act announced in 2014 recorded that the state has no rules about who may engage a private certifier, that in practice it is usually the builder whose work is being assessed, and that this creates a perceived conflict of interest, particularly where high volume builders use the same certifier repeatedly.

That was twelve years ago. The position has not changed.

What would actually have to change

None of this needs a new regulator or another layer of rules. The layers are the problem.

The cheapest fix is already written. Sections 58 and 78 contain the identification survey mechanism in full. Making it compulsory below a stated lot size, or wherever a plan of development applies, means changing a permissive word to a compulsory one. It would add a surveying cost to affected builds, which is precisely why it was left discretionary in the first place.

The second is a piece of plumbing. A plan of development lives in a council development approval file. It does not travel with the lot in a way that surfaces automatically when someone applies for a building approval. Nothing requires an approval to record that the document was even identified, let alone checked. A prescribed field on a form would create a paper trail for the step that most reliably fails.

The third is the structurally serious one and the most contested. Because appeal rights follow submission rights, giving adjoining owners any submission opportunity on a change application that reduces an approved setback would automatically create an appeal right under Schedule 1. It would also add time to approvals, which is the argument that has kept it off the table.

And then there is the question Queensland has been carrying since 2014 about who engages the certifier, which no amount of tightening at the inspection end resolves.

The Good Builder Take

There is no villain in this story. There is a fifteen year old state code, seventy seven councils writing their own versions of it, a national code that sets a different test again, and an estate document that outranks all of them and appears in none of their lists.

The single fact worth carrying is this. Our inspection regime checks whether a building matches its approval. It never checks whether the approval was right. Every safeguard downstream of a wrong approval will confirm the wrong answer perfectly.

The fix for that is already sitting in sections 58 and 78 of the Building Act. It is currently spelled may.

Common questions

This article is general information for the Australian construction industry. It is not legal, financial or compliance guidance, and it does not take account of the circumstances of any particular project or property. Planning and building requirements vary by state, by local government and by estate. Verify current obligations with your local government, the Queensland Building and Construction Commission and your building certifier before acting.

Sources: Building Act 1975 (Qld) ss 30, 32, 33, 58, 78, 84; Building Regulation 2021 (Qld) ss 35, 44, 53, 74; Planning Act 2016 (Qld) ss 45, 53, 81A, 164, 168, sch 1; Planning and Environment Court Act 2016 (Qld) s 11; NCC Housing Provisions Part 9.2; Queensland Development Code MP 1.1 and MP 1.2; Penalties and Sentences (Penalty Unit Value) Amendment Regulation 2026; Queensland ministerial media statement on the Queensland Housing Code and Modern Homes Standards; Building (Approvals and Practitioners) Bill 2026 (NSW) and NSW Government reform materials; review of the Building Act 1975 and building certification in Queensland, discussion paper 2014. Last updated 5 August 2026.

Author: TGB Editorial