Understanding the language your contractor uses is one of the most practical steps you can take before starting a kitchen renovation. This glossary covers the essential terms across structure, trades, materials, fittings, budgeting, and contracts — giving Sydney homeowners, first-time renovators, and property investors a clear reference point for every stage of the project.
Structural and Layout Terms
Wet area refers to any zone in a kitchen that is regularly exposed to water — including the sink area and dishwasher recess. Wet areas require specific waterproofing treatment under Australian Standards.
Load-bearing wall describes a wall that carries the structural weight of the building above it. Removing or modifying a load-bearing wall requires engineering approval and is a significant cost driver in kitchen layout changes.
Floor plan reconfiguration means changing the physical layout of a kitchen — moving walls, relocating plumbing, or repositioning appliances. Reconfiguration increases both complexity and cost compared to a like-for-like renovation.
If you are considering structural changes, understanding how these decisions affect your overall budget is essential — our kitchen renovation costs guide breaks down real Sydney pricing across labour, materials, and structural work so you can plan with confidence.
Trades and Labour Terms
Licensed tradesperson refers to a contractor who holds a current licence issued by NSW Fair Trading to perform specific regulated work — including plumbing, electrical, and waterproofing. Always verify licences before engaging any trade.
Subcontractor is a specialist trade engaged by the head contractor to complete a defined scope of work — such as a tiler, electrician, or plumber. You typically do not manage subcontractors directly when working with a head contractor.
Project manager or head contractor is the person or company responsible for coordinating all trades, managing the schedule, and delivering the finished renovation. They are your primary point of contact throughout the project.
Materials and Finishes Terms
Substrate refers to the base surface that tiles, flooring, or other finishes are applied to. The condition and type of substrate directly affects what preparation work is needed before installation.
Waterproofing membrane is a liquid or sheet-applied barrier applied to wet areas before tiling. In kitchens, it is required around sink areas and splashback zones under AS 3740. Skipping or underspecifying waterproofing is one of the most common causes of long-term damage.
Grout fills the joints between tiles and is available in sanded and unsanded varieties. Silicone is used at movement joints — corners, junctions between surfaces, and around fixtures — where grout would crack under normal building movement. Using the wrong product in the wrong location causes premature failure.
Fixtures, Fittings, and Appliances Terms
Fixtures are permanently installed items connected to plumbing or electrical services — such as a sink, cooktop, or rangehood. Fixtures are typically included in the base scope of works.
Fittings refer to the smaller components that connect fixtures to services — tap connectors, waste fittings, and supply lines. Fittings are often specified separately and can vary significantly in quality and price.
Tapware describes taps, mixers, and associated hardware. Tapware is commonly specified as a Prime Cost (PC) item in renovation contracts, meaning a budget allowance is set and the homeowner selects the product within that allowance.
Budgeting and Cost Terms
Provisional Sum (PS) is an estimated allowance included in a contract for work where the full scope or cost cannot be confirmed at the time of signing — such as demolition or structural repairs. If the actual cost differs from the PS, the contract price adjusts accordingly.
Prime Cost (PC) Item is a budget allowance for a specific product that the homeowner selects — such as tapware, a sink, or appliances. The PC amount is included in the contract; if the chosen product costs more or less, the difference is added or deducted.
Contingency allowance is a reserved budget — typically 10 to 15 percent of the total project cost — set aside to cover unexpected expenses such as concealed damage, additional structural work, or scope changes discovered during construction.
Understanding these terms in isolation is useful, but seeing how provisional sums, PC items, and contingencies interact across a real project budget is where the clarity comes — our kitchen renovation costs guide applies each of these concepts to typical Sydney renovation scenarios.
Contract and Compliance Terms
Scope of works is the written document that defines exactly what work will be completed, by whom, and to what standard. A clear scope of works protects both the homeowner and the contractor by setting agreed expectations before work begins.
Variation is a formal change to the agreed scope of works after the contract is signed. Variations can increase or decrease the contract price and must be documented in writing. Undocumented verbal variations are a leading cause of disputes.
Certificate of Occupancy (CC or OC) is a document issued by the local council or a private certifier confirming that the completed work meets the approved plans and relevant building codes. Not all kitchen renovations require a CC, but structural or plumbing changes often trigger this requirement.
Each of these contract terms connects directly to the broader renovation process — our kitchen renovation planning guide walks through every stage from scope setting to final sign-off, helping you understand how compliance fits into the full project timeline.
Conclusion
Knowing the correct terminology puts you in a stronger position when reviewing quotes, reading contracts, and making decisions with your contractor. These terms cover the core language used across every stage of a kitchen renovation in Sydney.
When you understand what a provisional sum, a variation, or a waterproofing membrane actually means, you can ask better questions and avoid the misunderstandings that lead to cost blowouts. Clarity at the planning stage protects your budget throughout the build.
At Sydney Home Renovation, we believe informed clients get better outcomes. If you are ready to move from terminology to a real renovation plan, contact our team for transparent, detailed guidance tailored to your project.
Frequently Asked Questions
What is the difference between a fixture and a fitting in a kitchen renovation?
A fixture is a permanently installed item connected to plumbing or electrical services, such as a sink or cooktop. A fitting is a smaller component that connects the fixture to its service — such as a tap connector or waste fitting.
What does a provisional sum mean in a renovation contract?
A provisional sum is an estimated allowance for work where the exact cost cannot be confirmed at the time of signing. If the actual cost is higher or lower than the provisional sum, the contract price adjusts to reflect the difference.
Do I need a Certificate of Occupancy for a kitchen renovation in Sydney?
Not all kitchen renovations require a Certificate of Occupancy. Structural changes, plumbing relocations, or work requiring a Development Application are most likely to trigger this requirement. Your contractor or a private certifier can confirm what applies to your specific project.Kitchen Renovation
