Class 2 Building Requirements in NSW

An apartment project can have an approved design and still need substantial work before construction can begin. For developers, understanding Class 2 building requirements in NSW means knowing which designs need declarations, who takes responsibility for them, and when the project team must lodge its documents. These decisions affect consultant appointments, the construction programme and the information your builder needs on site.

This guide focuses on new apartment developments, from confirming the building classification to preparing for occupation. The exact requirements depend on the proposed building, the work involved and any applicable exclusions, so the project team should establish the compliance scope early.

What is a Class 2 building?

Class 2 generally covers apartment buildings containing two or more separate dwellings. Residents commonly live above and below one another, although the classification can also include single-storey attached dwellings above a shared basement or car park. The NSW building classification guide illustrates these arrangements.

Class 2 does not mean high-rise. A small apartment building may fall within the same classification as a residential tower, even though their design and construction requirements differ considerably. Likewise, a marketing description such as “townhouses” does not settle the classification. The actual arrangement and use of the building matter.

For a developer, this is a question to resolve before relying on a preliminary budget or appointing the full consultant team. Ask the designer and certifier to confirm the proposed classification, including any differently classified parts of a mixed-use development.

Who is responsible for Class 2 compliance?

The NSW Design and Building Practitioners framework assigns different responsibilities to designers and builders. Registered design practitioners declare regulated designs within their authorised registration categories. A project may therefore need several practitioners covering different disciplines. Staff can contribute to drawings under appropriate supervision; every person producing a drawing does not need a separate registration.

The registered building practitioner carries responsibility for the building work and the building compliance declaration. A standard NSW building licence does not, by itself, replace the required registration under this framework.

Before accepting consultant proposals, ask who will declare each design package, which registration covers that work, and who will coordinate the interfaces between disciplines. A proposal should also explain whether it includes construction-stage design changes and responses to the builder’s queries. An appointment described simply as “architectural drawings” may leave important responsibilities unclear.

Developers have their own administrative obligations. NSW guidance requires a developer account on the Planning Portal, nomination of the relevant practitioners and principal certifier, and entry of the building work commencement date before construction begins. Appointing consultants does not remove these tasks from the project programme.

Which designs and documents are required before construction?

Regulated designs concern specified building elements or performance solutions. The covered elements include structure, waterproofing, fire safety systems, the building enclosure and relevant building services. NSW guidance also identifies aspects of vertical transportation products required for Building Code of Australia compliance.

These categories overlap in practical ways. A balcony detail, for example, may require decisions about structural levels, drainage, waterproofing, door thresholds and the external wall. Treating each drawing as an isolated deliverable can leave the builder with conflicting information. A useful coordination review checks that the disciplines describe one buildable arrangement.

For regulated work, the certifier needs the relevant declared designs to issue a construction certificate or complying development certificate. The required designs and declarations must also be lodged on the NSW Planning Portal before the related building work starts.

Allow time for this work between planning approval and the proposed site start. Ask the team for a document schedule identifying each package, its responsible practitioner, outstanding consultant inputs and issue date. This makes it easier to see whether the programme reflects the remaining design work.

What happens if the design changes during construction?

A product substitution or revised detail can affect more than appearance or price. Consider a proposed change to a balcony door: a different threshold may alter the relationship between the internal floor, external drainage and waterproofing. The relevant designers should assess those interfaces before the builder proceeds.

Where a variation affects a building element or performance solution, the building practitioner must obtain the updated regulated design and design compliance declaration before the varied work starts. NSW guidance then requires lodgement within one day of commencing that varied work. Other changes may instead require a variation statement, so the team should check the correct process for each change.

Agree on a change-control process before construction. It should identify who raises a proposed change, who reviews its design consequences, who approves any cost adjustment and who updates the documents. Include time for this review in procurement decisions, particularly when an alternative product affects several disciplines.

What must happen before an occupation certificate?

Occupation requirements need attention well before practical completion. Developers generally must lodge an expected completion notice between six and twelve months before applying for an occupation certificate. For a new building expected from the outset to reach that application in less than six months, NSW guidance provides a shorter-project rule: lodge the notice within 30 days of building work commencing.

Keep the notified date under review. If it moves more than 60 days earlier or later, an amendment notice is required within seven days of becoming aware of the change. This is particularly relevant when procurement delays or revised staging affect the anticipated completion date.

Before the occupation certificate application, the building practitioner must lodge the building compliance declaration and required final regulated designs. The person applying must also give the building practitioner at least 14 days’ notice. These requirements sit alongside the earlier expected completion notice.

Financial obligations also need a place in the development budget. The building work levy applies to new regulated buildings, while eligible new apartment buildings of four storeys or more fall within the Strata Building Bond and Inspections Scheme. Check the applicable scheme requirements and payment arrangements for your project rather than assuming every Class 2 development follows an identical process. The NSW developer obligations guidance provides the relevant starting points.

Planning your Class 2 project with Zand Design

Before commissioning detailed design, bring together the site information, your intended apartment mix, the development budget and any existing approvals. These give the architectural team a clearer basis for discussing the project and identifying the specialist input it may require.

When comparing proposals, look beyond the number of drawings. Establish what each appointment includes, where responsibility passes to another consultant, and how the team will handle coordination and construction-stage changes. Confirm the relevant practitioner registrations and declaration responsibilities for the specific scope.

Explore Zand Design’s architectural services and selected projects to understand the studio’s work. To discuss a proposed apartment development, book a free consultation and share your site address, available documents and current project stage.

Reviewed against NSW Government guidance on 10 October 2026. This guide provides general project information; the appointed practitioners and certifier should confirm the requirements for your development.