✅ BCA – The Building Code of Australia

Understanding the BCA and Why It Matters in Building & Construction

What Is the BCA?

The Building Code of Australia (BCA) forms Volumes One and Two of the National Construction Code (NCC). It sets the minimum standards for the design, construction and performance of buildings across Australia.

The BCA is developed, updated and maintained by the Australian Building Codes Board (ABCB) on behalf of the Australian Government and every State and Territory. Because each state has formally adopted it into law, the BCA holds the same authority as building regulations in NSW and all other jurisdictions.

For builders, designers, engineers, certifiers and consultants, the BCA acts as the primary compliance framework used to assess whether a building meets Australia’s national safety, health, amenity and sustainability requirements.

✅ The Goal of the BCA

The BCA aims to deliver nationally consistent, minimum necessary standards that ensure buildings are:

• Safe and structurally sound

• Resistant to fire

• Healthy and hygienic

• Comfortable and liveable

• Energy efficient and sustainable

The overarching objective is to protect the community while supporting efficient, cost-effective construction practices.

The BCA applies this goal by ensuring that:

• ✅ Regulations are based on verified evidence and solid reasoning

• ✅ Benefits to society outweigh the costs

• ✅ Industry competitiveness is not restricted more than necessary

• ✅ No better regulatory or non-regulatory alternative exists

Any change to the BCA must pass through a formal Regulatory Impact Assessment (RIA) to confirm it produces genuine public benefit.

✅ How the BCA Is Structured

While the BCA sits within the broader NCC, its two volumes target different building classes:

📘 Volume One (BCA Volume 1)

Covers Class 2 to 9 buildings, including:

• Apartments

• Commercial buildings

• Warehouses

• Hospitals

• Schools

• Industrial premises

Volume 1 contains detailed requirements for:

• Fire safety systems

• Structural performance

• Access and egress

• Building services

• Fire resistance levels (FRLs)

• Acoustic and thermal performance

📙 Volume Two (BCA Volume 2)

Covers Class 1 and 10 buildings, which include:

• Houses

• Townhouses

• Sheds

• Carports

• Private garages

This is the volume most relevant to residential builders, contractors, homeowners and rural property owners.

✅ Why the BCA Matters for Homeowners, Builders and Rural Property Owners

Whether you are building a home in Tamworth, renovating a rural farmhouse, constructing a farm shed, or lodging a development application, the BCA ensures your project meets the minimum standards required by law.

For clients of Awesim Building Consultants, the BCA plays a critical role in:

✅ Expert Witness Reports

Identifying non-compliant building work, incorrect materials, poor workmanship or unsafe construction practices.

✅ NCAT and Dispute Resolution

Clarifying what the builder was required to do under the NCC/BCA. This is essential when preparing Scott Schedules, breach notices or evidence for hearings.

✅ Pre-Purchase & Dilapidation Inspections

Highlighting construction that does not meet performance requirements — especially in older or rural buildings that may pre-date current standards.

✅ Design and Renovation Advice

Ensuring upgrades and alterations are done correctly, safely and legally.

✅ Performance Requirements vs Deemed-to-Satisfy (DTS)

The BCA provides two pathways to compliance:

1️⃣ Performance Solutions

• Customised designs that meet Performance Requirements

• Often used in complex builds, farm structures, bushfire zones, rural constraints

• Must be backed by engineering, assessment or expert justification

2️⃣ Deemed-to-Satisfy (DTS) Solutions

• Prescriptive rules (e.g., wall thickness, window heights, door clearances)

• The most common pathway for standard construction

• Faster and easier to document and certify

Builders, consultants and certifiers must choose the correct pathway depending on the project.

✅ How Often Is the BCA Updated?

The NCC (and therefore the BCA) is updated on a 3-year cycle.

Each new edition may include:

• Improved safety requirements

• New energy efficiency standards

• Updated fire protection measures

• Revised structural codes

• Accessibility improvements

• Clarifications to definitions or performance clauses

Keeping up with these changes is essential for compliance.

✅ Why Work With a Consultant Who Understands the BCA?

Building disputes often arise because one or more parties misunderstand their obligations under the NCC/BCA.

At Awesim Building Consultants, we:

• Interpret the BCA correctly

• Identify breaches and defects

• Prepare detailed reports and Scott Schedules

• Provide expert evidence for NCAT

• Help property owners and builders understand their rights and responsibilities

Whether you have a non-compliance issue, a renovation project, a dispute, or simply need clarity — we help ensure your building work aligns with the standards required by law.

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Glen Sim is a highly experienced Building Consultant, Licensed Builder, Construction Consultant, and Expert Witness with more than 35 years of practical experience within the Australian building and construction industry. As the Founder and Director of Awesim Building Consultants, Glen has established a strong reputation throughout Sydney and regional New South Wales for providing independent, evidence-based building consultancy services and expert reporting for complex building and construction disputes. Beginning his career as an apprentice carpenter with TAFE NSW in 1990, Glen completed his apprenticeship in 1993 before progressing into senior construction and management roles across residential, commercial, and remedial building sectors. His extensive industry background provides him with genuine hands-on construction knowledge — something that distinguishes him from many consultants who have limited site-based experience. Glen became a Licensed Builder in Victoria in 2004 before returning to New South Wales in 2011, where he continues to operate under NSW Builder Licence No. 232673C. Over the course of his career, he has worked across all stages of the construction process, including carpentry, supervision, project management, contract administration, construction scheduling, defect rectification, quality control, and dispute resolution. Today, Glen is widely recognised for his expertise in: Expert Witness Reports Scott Schedules NCAT Building Disputes Construction Defect Investigations Building Defect Reports Quantum Meruit Assessments Construction Programming & Delay Analysis Client-Side Project Management Contract & Scope of Works Assessments Glen regularly assists homeowners, builders, developers, solicitors, strata managers, insurers, and commercial clients by providing technically detailed and independent reporting for litigation and dispute resolution matters. His reports are prepared with a strong understanding of the requirements of the NSW Civil and Administrative Tribunal (NCAT), court procedures, the Expert Witness Code of Conduct, the National Construction Code (NCC), Australian Standards, and accepted building industry practices. Over 15+ years experience providing litigation support with expert witness reports and Scott schedules. What clients value most about Glen is his practical approach, integrity, attention to detail, and ability to clearly explain complex construction issues in a manner that is easy to understand. His combination of trade-based experience, construction management knowledge, and investigative expertise allows him to identify issues that are often overlooked by less experienced consultants. Over the years, Glen has developed a reputation for producing thorough, methodical, and evidence-supported reports that clients and legal representatives can rely upon during negotiations, mediations, tribunal proceedings, and litigation matters. His commitment to accuracy, professionalism, and impartiality has made Awesim Building Consultants a trusted name in the building consultancy industry across NSW. Glen is also known for his strong commitment to client service, ensuring every matter is approached with professionalism, transparency, and genuine care for achieving practical outcomes. His experience across both metropolitan Sydney and regional New South Wales provides him with a broad understanding of differing construction methods, site conditions, workmanship standards, and project delivery challenges throughout the state. Outside of the construction industry, Glen values family life and regional Australia. He has been happily married to internationally recognised author Audra Starkey since March 2025. Together, they share a passion for supporting rural communities and building trusted professional relationships grounded in honesty and respect. With more than three decades of industry experience, Glen Sim continues to provide trusted building consultancy and expert witness services backed by real construction knowledge, independent assessment, and a commitment to helping clients navigate complex building matters with confidence.

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