Section 4.15 of the Environmental Planning and Assessment Act 1979 is one of the most frequently cited (and misunderstood) provisions in the NSW planning system.

Section 4.15 does not create a checklist that must be satisfied in a rigid way. Instead, it identifies the matters a consent authority must consider when determining a development application.

This article provides a practical breakdown of each limb of section 4.15 and highlights some of the areas that are commonly misunderstood.

The Structure of Section 4.15

Section 4.15 requires a consent authority to take into consideration the following matters when determining a development application:

1. Any environmental planning instruments
2. Any proposed instruments that have been publicly exhibited
3. Any development control plans
4. planning agreements (or draft planning agreements)
5. the regulations (where they prescribe matters)
6. The likely impacts of the development
7. The suitability of the site
8. Any submissions made
9. The public interest

Each of these matters plays a different role in the assessment process.

Environmental Planning Instruments

Environmental planning instruments (EPIs) include:

1. Local Environmental Plans (LEPs)
2. State Environmental Planning Policies (SEPPs)

These instruments contain legally binding controls such as:

1. zoning
2. height limits
3. floor space ratios
4. minimum lot sizes
5. land use tables.

One of the most common misunderstandings is treating EPIs as just another planning consideration. In reality, EPIs often contain mandatory standards or requirements that must be complied with unless a lawful variation mechanism is available.

If a development is prohibited by an EPI, it cannot be approved.

Proposed Instruments

Section 4.15 also requires consideration of proposed instruments that have been publicly exhibited.

This reflects the idea that planning controls may be changing, and those changes may be relevant to the assessment of a development application.

However, proposed instruments do not have the same legal status as an LEP or SEPP. They are a matter to be considered, not applied as binding controls.

In practice, the weight given to a proposed instrument often depends on:

1. how advanced the process is
2. whether the changes are likely to be made
3. the purpose of the proposed controls.

Development Control Plans (DCPs)

Development Control Plans provide detailed planning guidance and performance criteria for development.

They typically deal with matters such as:

1. setbacks
2. landscaping
3. privacy
4. building articulation
5. site coverage.

A common misunderstanding is that DCPs operate in the same way as LEPs.

They do not.

DCPs are guidelines, not statutory standards. A consent authority must consider them, but it may approve development that does not strictly comply with them if there is a reasonable planning justification.

Planning Agreements

Under section 4.15, a consent authority must consider any planning agreement entered into under section 7.4 or any draft planning agreement offered by the developer.

Planning agreements commonly deal with:

1. infrastructure contributions
2. public works
3. land dedication
4. monetary contributions.

A planning agreement does not determine whether development should be approved, but it can be a relevant consideration when assessing the overall planning outcome.

The Regulations

Section 4.15 requires consideration of the regulations to the extent they prescribe matters relevant to the development application.

The regulations frequently deal with matters such as:

1. notification requirements
2. procedural matters
3. technical assessment requirements.

Although this limb is not often discussed in planning reports, it remains a statutory consideration.

Significant likely Impacts of the Development

Section 4.15 requires consent authorities to consider the significant likely impacts of the development, which can include:

1. environmental impacts
2. social impacts
3. economic impacts.

This limb often generates the most discussion because it involves a broad evaluation of how the development will affect its surroundings.

Typical issues considered here include:

1. traffic and parking
2. noise
3. overshadowing
4. visual impact
5. heritage impacts
6. flooding and environmental constraints.

This limb does not require impacts to be eliminated. The task is to assess whether the impacts are acceptable in the planning context.

Suitability of the Site

The suitability of the site is sometimes misunderstood as a purely physical question.

In practice, the assessment often includes both:

1. physical characteristics of the site (such as slope, flooding, contamination), and
2. planning characteristics (such as surrounding land uses or compatibility with the area).

For example, a site may technically accommodate a development from an engineering perspective but still be unsuitable because the development conflicts with the surrounding character.

Submissions

Consent authorities must consider any submissions made.

This requirement ensures that community concerns form part of the assessment process.

However, submissions do not determine the outcome of a development application. The role of submissions is to identify issues that need to be considered, rather than to decide the application.

A large number of objections does not automatically mean a development should be refused.

The Public Interest

The final limb of section 4.15 is the public interest.

This concept is sometimes treated as a separate test, but in practice it often reflects the overall planning outcome after the other matters have been considered.

The public interest may involve issues such as:

1. consistency with planning framework
2. the objects of the EPA Act
3. proper application of planning controls

What about matters that are not relevant?

The regulations may also declare certain factors to be relevant or not relevant when considering impacts, site suitability or the public interest. Where a factor has been declared not relevant, a consent authority must not take it into consideration.

A Final Observation

Section 4.15 is sometimes treated as a formula that produces a single correct outcome.

In reality, the provision requires a planning judgment. Different decision-makers may legitimately reach different conclusions after considering the same matters.

What the Act requires is that those matters are properly considered.

Understanding the role of each limb of section 4.15 helps ensure that development applications are assessed in a way that reflects both the legal framework and the practical realities of the planning system.