You've spent months, or maybe even years, planning your renovation. You can picture the open plan kitchen, the extra space for your family, and the first morning coffee in your finished home.
Then you sit down with a builder.
Suddenly you're hearing terms like Planning Consent, Prime Cost items, and Working Drawings. Everyone else seems to understand exactly what they mean, so you nod along and hope it all makes sense later.
The problem is these terms aren't just builder jargon. They can affect your budget, your timeline, and the decisions you'll make throughout your project.
That's why we've put together this guide. These are the building terms every homeowner should understand before starting their renovation or extension.
Why understanding the language matters
Most building projects don't become difficult because of one major mistake. More often, problems come from a series of small misunderstandings that build up over time.
A renovation involves designers, engineers, councils, suppliers, and trades. Each group has its own terminology. While these terms may be second nature to a builder, they shouldn't be expected knowledge for homeowners.
The right builder will take the time to explain what each term means and how it affects your project. The more you understand, the easier it becomes to ask questions, make decisions, and feel confident throughout your build.
Phase 1: Understanding Your Approvals
Before construction can begin, your project needs the right approvals. These terms are often confused, but each one has a different purpose.
Planning Consent
Planning Consent focuses on how your project fits within your neighbourhood.
It considers things like building height, setbacks from boundaries, site coverage, privacy, and how the design impacts surrounding properties.
This process ensures your proposed design meets your local council's planning requirements before moving forward.
Building Rules Consent
Building Rules Consent is the technical approval for your project.
It confirms that your plans meet the required building standards, including structural safety, engineering requirements, fire safety, and compliance with the National Construction Code.
Development Approval
Development Approval is the final approval from your local council before construction can begin.
Once your project has achieved both Planning Consent and Building Rules Consent, the council can issue Development Approval. This confirms your project has met the required approval conditions and can legally move into construction.
Phase 2: Understanding Your Building Drawings
Not all drawings serve the same purpose. As your project moves from an idea into construction, the drawings become more detailed and provide more information about how your home will be built.
Concept Designs
These are the first ideas for your home.
They include early sketches, layouts, and floor plans that help explore the overall design, room sizes, and how the spaces connect before moving into the finer details.
Planning Drawings
These drawings are prepared for your Planning Consent application.
They show council how your proposed design will look and demonstrate that it meets the planning requirements needed for approval.
Working Drawings
Working Drawings develop the design further.
They include detailed information such as dimensions, layouts, and electrical plans. At this stage, some technical details, engineering requirements, and interior selections may still be finalised.
For Construction Drawings
These are the final drawings used to build your home.
They include the complete set of construction details, engineering information, material specifications, and other technical requirements needed by your builder and trades.
Construction should only begin once these drawings have been fully coordinated and finalised.
Phase 3: Understanding Your Contract and Construction Process
Your building contract outlines what is included in your project and how costs are managed. These terms are important because they can affect your final project cost.
Prime Cost (PC) Items
A Prime Cost item is an allowance for products that have not been selected at the time your contract is prepared.
This could include items such as appliances, tapware, tiles, or light fittings.
Once you make your final selections, the allowance is adjusted to reflect the actual purchase price.
For example, if your contract includes a $3,000 allowance for an oven but you select one that costs $4,500, the difference would be added to your contract price.
Provisional Sums (PS)
A Provisional Sum is an allowance for work that cannot be accurately priced when your contract is prepared.
This usually applies to labour or construction work where the full scope is not known yet, such as unexpected rock excavation or hidden structural issues.
Once the work is completed, the actual cost is adjusted based on what was required.
It is important to review both Prime Cost items and Provisional Sums carefully. If allowances are unrealistically low, your final project cost may increase as selections are made or additional work is required.
Variations
A variation is any change made to your contract after it has been signed.
This could include changing a tile selection, moving a wall, upgrading finishes, or adding additional work during construction.
Variations can affect both your project cost and construction timeline, which is why clear communication and approval before changes are made is important.
Request for Information (RFI)
A Request for Information, often called an RFI, is a formal question raised during a project when clarification or additional information is needed.
For example, a builder may send an RFI to an engineer to confirm a structural detail, or a builder may request clarification from the designer about a specific finish or detail.
RFIs help ensure everyone is working from the same information before decisions are made on site.
How We Keep Things Simple at ZJ Building
Understanding the terminology is only part of the process. The other important part is working with a builder who explains things clearly before asking you to make decisions.
At ZJ Building, we believe good communication is just as important as good construction.
We don't expect you to understand every building term from day one. Instead, we guide you through each stage of your project and explain the decisions that affect your home.
We use drawings, samples, 3D models, and site discussions to help you understand exactly what is being built before construction begins.
We also keep detailed records throughout your project, so everyone involved understands the decisions that have been made and the outcome we are working towards.
Building Shouldn't Feel Like Learning Another Language
Your renovation should be an exciting process, not one where you feel lost in technical terms and paperwork.
The right builder will take the time to explain the process, answer your questions, and help you understand the decisions that affect your home and your budget.
If you're planning a renovation or extension and would like to understand how we guide homeowners through the process, we'd love to have a conversation.
