Engaging a professional draftsperson ensures your project is accurately documented, compliant, and efficiently prepared for council approval and construction. A draftsperson translates your ideas and design requirements into clear, build-ready plans that meet regulatory standards, including BASIX and planning requirements in NSW.

Working with a draftsperson early in the design stage can also help identify potential compliance issues, improve spatial planning, and reduce costly redesigns later in the process. For homeowners, this means a smoother approval pathway and better project clarity. For builders and architects, it ensures coordinated documentation that supports efficient construction and energy compliance outcomes.

A BASIX (Building Sustainability Index) Certificate is a mandatory NSW requirement for most new homes, major renovations (over $50,000), and certain developments. It assesses a dwelling’s energy efficiency, water usage, and thermal comfort to ensure it meets the sustainability targets set by the NSW Government before approval.

The certificate must be submitted with your Development Application (DA) or Complying Development Certificate (CDC). A BASIX assessment considers factors such as orientation, insulation, glazing, materials, and overall design performance. Engaging a qualified assessor early helps achieve compliance efficiently, avoid redesigns, and improve the long-term energy performance and comfort of your home.

A NatHERS Certificate is an official energy rating report for a residential dwelling issued under the Nationwide House Energy Rating Scheme (NatHERS). It assesses the thermal performance of a home’s design and estimates how much energy will be needed to heat and cool the building for year-round comfort.

The certificate is generated by an accredited assessor using approved thermal modelling software, based on your architectural plans, orientation, materials, glazing, insulation, and construction details. The result is a star rating out of 10 stars — the higher the rating, the more energy-efficient and thermally comfortable the home is.

In NSW, a NatHERS Certificate is commonly used to demonstrate compliance with BASIX energy requirements as part of the development approval process. It helps ensure the dwelling is designed to reduce energy consumption, improve thermal performance, and meet sustainability standards before construction begins.

The cost of a BASIX or NatHERS assessment can vary depending on the size, complexity, and type of your project, but most standard residential projects fall within a clear general range.

For a typical new home or granny flat in NSW, a combined BASIX and NatHERS assessment usually costs around $600–$900+, while more complex homes or dual occupancies can be higher due to additional modelling and documentation.

If completed separately, a NatHERS certificate alone generally ranges from about $300–$1,500, depending on the level of thermal modelling required and the design complexity.

A BASIX certificate on its own is often around $300–$1,000 for most residential projects, including the consultant assessment and certification preparation, with small government lodgement fees added through the NSW Planning Portal.

Final pricing depends on factors such as:

• Size and layout of the dwelling

• Design complexity and glazing

• Number of dwellings (e.g. dual occupancy)

• Revisions or design optimisation

• Whether NatHERS simulation is required for compliance

For most homeowners, builders, and architects, the best way to obtain an accurate quote is to provide architectural plans, as assessments are priced based on modelling scope rather than a fixed flat fee.

In NSW, BASIX is generally required for renovations or alterations where the value of the work is $50,000 or more, or when the project involves significant changes to the building’s thermal performance.

This includes projects such as large extensions, major internal reconfigurations, or alterations that affect windows, insulation, or the building envelope. If your renovation meets the $50K threshold, a BASIX Certificate is typically needed as part of your Development Application (DA) or Complying Development Certificate (CDC).

However, smaller renovations under $50,000, minor works (like cosmetic upgrades), or projects that do not significantly impact energy, water, or thermal performance may not require BASIX. Requirements can also vary depending on your local council and the scope of works.

If you’re unsure, the best approach is to have your plans reviewed early, as BASIX compliance can influence glazing, insulation, and design decisions before approvals are lodged.

You should engage an energy assessor as early as possible in the design stage, ideally once preliminary plans or concept drawings are available.

Early involvement allows the assessor to provide guidance on orientation, glazing, insulation, shading, materials and window/roof colours before plans are finalised. This helps avoid costly redesigns and ensures the project can achieve BASIX and NatHERS compliance without compromising the overall design.

For new homes, extensions, granny flats, and dual occupancies in NSW, the assessment is typically required before lodging your DA or CDC. Engaging an assessor early also streamlines approvals, supports smoother collaboration with your designer, builder, or architect, and helps deliver a more thermally efficient and compliant outcome from the outset.

Yes. Engaging early in the design phase can significantly reduce costs, delays, and redesign risks.
Projects that involve thermal modelling during concept design typically achieve higher star ratings, faster approvals, and better budget control compared to late-stage assessments.