About the DTS (Deemed-to-Satisfy). Find out what the requirements are to certify your project today.
Everything you need to know about the NatHERS requirements per state.
DTS stands for Deemed-to-Satisfy. In simple terms, it’s a set of predefined energy efficiency requirements under the National Construction Code (NCC) that a residential building can follow to be considered compliant. A DTS residential assessment checks whether a home’s design—such as insulation, glazing, building fabric, and services—meets these minimum standards without needing alternative performance modelling.
Think of DTS as a checklist-based compliance pathway. If your home meets all the DTS criteria outlined in the NCC, it is deemed to satisfy the energy efficiency requirements.
Our team at Certified Energy will guide you through the various approval pathways to help your project achieve the necessary compliance.
A DTS residential assessment may be required by a range of stakeholders involved in a residential project, including homeowners building a new home, builders seeking construction approval, designers and architects finalising documentation, and developers working on residential projects. It is also commonly required by certifiers verifying NCC compliance. In general, anyone responsible for demonstrating NCC DTS residential compliance may need a DTS assessment as part of the approval and certification process.
Energy compliance is not just about ticking boxes—it’s about accuracy, accountability, and avoiding costly delays. A certified DTS assessor understands current NCC requirements, identifies potential compliance issues early, and reduces the risk of rejected applications. They provide documentation that is accepted by certifiers and councils and ensure the assessment is defensible and audit-ready. Incorrect or incomplete DTS reports can result in redesigns, approval delays, or additional costs, which is why working with an experienced professional helps ensure the DTS residential assessment is completed correctly the first time.
A DTS residential assessment is a clear and structured way to meet Australia’s residential energy efficiency requirements under the NCC. By understanding what DTS is, when it applies, and how it differs from NatHERS, homeowners and project teams can make informed decisions early in the design process.
Whether you’re building new or updating an existing home, a well-prepared DTS residential service plays a key role in achieving compliant, efficient, and approval-ready residential buildings across Australia.
Building design decisions play a major role in the outcome of a DTS residential assessment. Elements such as orientation, window sizes, glazing specifications, insulation placement, and construction materials directly affect whether a home meets NCC Deemed-to-Satisfy energy efficiency requirements. Even small design changes can shift a project from compliant to non-compliant under the DTS pathway.
Understanding how these design choices interact with NCC requirements early in the design stage can prevent costly revisions later. A DTS residential assessment helps identify where adjustments may be needed so energy efficiency targets are met without compromising the overall design intent.
Alterations and additions to existing homes can trigger the need for a DTS residential assessment, depending on the scope of work. Changes to building envelopes, roof structures, external walls, windows, or services may require reassessment under NCC energy efficiency provisions.
A DTS assessment determines whether the modified areas meet current NCC standards without requiring the entire dwelling to be upgraded. Understanding these triggers helps homeowners and designers plan upgrades efficiently while remaining compliant.
Councils and certifiers rely on DTS residential assessments to confirm that a proposed building meets NCC energy efficiency requirements. These assessments provide a clear, standardised pathway for compliance verification.
Requesting a DTS assessment helps authorities reduce risk, ensure consistency, and confirm that approved designs meet regulatory obligations before construction begins.
A DTS residential assessment forms part of the documentation submitted for development approval or construction certification. It supports compliance verification by demonstrating that energy efficiency provisions have been met under the NCC.
Understanding where DTS assessments sit within the approval timeline helps project teams plan documentation submissions more effectively.
The timeframe for a DTS residential assessment depends on project complexity, documentation quality, and assessor availability. Simple residential projects may be assessed relatively quickly, while larger or more complex designs may take longer.
Providing complete and accurate drawings early helps streamline the assessment process and reduces turnaround time.
A common misconception is that DTS assessments are a simple tick-box exercise. In reality, they require careful analysis of building elements and alignment with NCC requirements.
Another misunderstanding is that DTS is always easier than NatHERS, when suitability depends on project design and approval pathways.
Best practice for DTS residential assessments includes early engagement, clear documentation, and coordination between design and compliance teams. Understanding NCC requirements during design helps avoid unnecessary revisions.
Consistent communication between assessors, designers, and builders supports efficient compliance outcomes.
Accurate DTS residential assessments help ensure that construction aligns with approved designs and NCC requirements. This reduces the risk of on-site changes or corrective work.
Clear compliance documentation supports smoother inspections and final approvals.
Choosing the correct insulation applications for your project for optimal thermal comfort and reducing or removing performance glazing.
Certified Energy, is a medium-sized company with over 12 people working with us and 15 years of experience in the ESD field. We take pride in the thoroughness of our assessments and often find that the quality of our work has a high standard, is precise, and lives up to the latest requirements of your NatHERS assessment needs. We can deliver projects quickly and resolve difficult or nonstandard situations with great expertise.
Here are 4 tips we think you should know before choosing your energy rating consultant.
Check qualifications; always choose your consultant based on their relevant building industry degree qualifications, anything from engineering, architecture, or building background should suffice.
When you are on a deadline, choose an ESD Assessor which has a minimum of 3-4 people working for them. 95% of the ESD Assessors have at least 3 consultants doing their energy assessments and will be able to respond fast.
Every ESD consultant should be able to discuss certain aspects of a NatHERS assessment, ask if they collaborate together, and can advise you about the best case practices when doing a NatHERS report.
What about their past project experience? Can your Assessor give you a good referral?
Every certified NatHERS project has a HERS certificate provided for the project. See how each of the elements of the building fabric are detailed and specified in these reports.
With the new NatHERs minimum set to change to a 7-star energy rating, you may be wondering how to go about building a new house that meets the target.
If you didn’t already know, the NatHERs website has free plans for your next build. The plans are designed to help you achieve a minimum 7-star energy rating.
With 3 designs to choose from, NatHERs recommends that you apply the key principles in your next build rather than copy the designs. This is because each site is different to another and will require a level of customisation to achieve a high energy rating.
The Your Home website contains various design packs that are designed by architects and energy assessors to create a 7-star minimum home.
With the NatHERS minimum star rating changing to 7 stars, you may be interested to know what sets a 7 star home apart in the world of energy efficient living? In this article, we'll dive into the benefits of 7 star homes and why energy efficiency is transforming the construction and design industry.
