A major renovation is not a decorating project with a few walls moved. Once you alter structure, plumbing, waterproofing or the home’s footprint, decisions made before work starts will determine the quality, cost and durability of the result. This renovation guide is for Melbourne and Victorian homeowners who want more space and better living without gambling on vague allowances, rushed design or shortcuts behind finished surfaces.
The best renovations feel straightforward at handover because the difficult work was handled early. The brief was tested against the existing house, the drawings were coordinated, approvals were addressed, the scope was properly priced and the site was managed with discipline. That is where value is created.
Start your renovation guide with the existing house
Every older home has a story. It may include uneven floors, ageing drainage, past alterations without clear documentation, shallow footings, poor subfloor ventilation or a roof that has reached the end of its useful life. None of these automatically prevents a renovation, but each can affect the design, budget and programme.
Before settling on layouts and finishes, arrange a thorough site assessment. A builder needs to understand the building’s structure, access constraints, services, roof condition and likely demolition requirements. On heritage homes or properties in established Melbourne suburbs, planning controls and neighbourhood character may shape what can be added, where it can sit and how it presents to the street.
This is also the point to be honest about whether renovating is the right answer. Retaining a well-built front section and extending it can preserve character and save unnecessary demolition. Conversely, a home with extensive structural issues, a compromised layout and limited ability to meet your needs may be better suited to a knockdown rebuild. The right path depends on the site, the home and the outcome you want, not on a one-size-fits-all rule.
Define the outcome before you design
A clear brief is more useful than a folder of images. Start with how the house needs to work on an ordinary weekday: who arrives when, where school bags land, how meals are prepared, whether someone works from home, and how the living spaces connect to the garden.
Then separate non-negotiables from preferences. You may need an additional bedroom, a larger kitchen and proper thermal comfort. You may prefer a butler’s pantry, skylights or custom joinery. Both matter, but they need different treatment when cost decisions arise.
Good renovation design is not simply about making rooms larger. It considers orientation, natural light, ceiling heights, circulation, storage and the relationship between old and new. It also resolves practical details early, including window locations, appliance requirements, electrical loads and drainage. Late changes in these areas are rarely cheap because they can affect several trades at once.
Set a realistic project budget
Your budget should cover more than the visible construction contract. Allow for design and documentation, engineering, permits, consultant fees, site investigations, authority requirements and selections. Depending on the project, you may also need temporary accommodation, storage and additional costs associated with living away from the site.
A contingency is sensible where the existing building contains unknowns. Opening walls and floors can reveal damaged framing, inadequate footings, termite activity or non-compliant past work. A professional builder will not use contingency as a vague buffer for poor planning. It should be discussed clearly, with a process for identifying, pricing and approving genuine unforeseen conditions.
Get the drawings and approvals right
For substantial renovations, a concept plan is only the beginning. Construction requires coordinated documentation that explains what is being built and how it will perform. Architectural drawings, engineering, energy rating requirements and relevant specifications need to align before a fixed price can be meaningful.
Planning approval may be required depending on the property’s overlay, proposed works and local council requirements. A building permit is also required for most major renovation work. These are different processes with different purposes. Planning considers the development’s impact and compliance with planning controls; the building permit confirms the work meets applicable building regulations.
Do not treat approvals as paperwork to deal with after selecting a builder. They affect timeframes, design choices and project risk. Early coordination is especially valuable for extensions close to boundaries, projects with heritage considerations, significant excavation, or homes affected by bushfire, flood or other overlays.
A design-and-construct approach can make this stage more controlled because the builder can review buildability while the design is being developed. That does not mean compromising the design. It means identifying costly clashes before they become site problems, such as a steel beam conflicting with a bulkhead, insufficient fall to drainage, or windows that cannot be installed as detailed.
Choose a builder on evidence, not impressions
A polished proposal is not proof of a well-managed build. Ask who will manage the project day to day, how the programme will be communicated, and how variations are controlled. Confirm that the builder and trades are appropriately licensed, insured and experienced in the type of renovation you are undertaking.
You should also understand how quality is checked. The invisible work matters most: footing preparation, structural bracing, waterproofing, flashing, insulation, drainage and service rough-ins. These elements are difficult or impossible to inspect once plaster, tiles and cladding are installed. A disciplined builder documents stage-by-stage inspections rather than relying on a final walk-through to find problems.
Price comparison needs care. Quotes that appear cheaper may exclude items, rely on provisional sums or use broad allowances for fixtures, excavation and services. A fixed-price contract provides greater certainty when the scope and selections are properly resolved. It cannot account for every hidden condition in an older house, but it should clearly identify exclusions, allowances and the process for approved changes.
Builda Group approaches major renovations as a managed construction process, not a collection of trades. That means coordinating design, permits, procurement, site supervision and quality checks around one accountable plan.
Prepare for construction without losing control
Renovation sites are more complicated than new-home sites because the existing house must be protected while work progresses. Access may be narrow, neighbours may be close, and parts of the home may remain occupied. A realistic programme should account for demolition, weather exposure, inspections, material lead times and the sequence required between trades.
Before work starts, confirm practical arrangements: site access, rubbish removal, protection of retained areas, working hours, parking, temporary fencing and communication with neighbours. If you intend to stay in the home, discuss exactly when essential services may be disconnected and whether there will be periods without a functional kitchen, bathroom or safe access route. For a full rear extension or structural renovation, moving out is often the safer and more efficient option.
Selections should be finalised early enough to protect the construction schedule. Tiles, tapware, appliances, lighting and joinery can have long lead times. More importantly, they influence rough-in positions, cabinetry dimensions and wall set-outs. Choosing a freestanding bath after plumbing has been installed, for example, can trigger avoidable rework.
Keep changes disciplined
Changes are sometimes necessary. You may discover an opportunity once a wall is opened, or decide that a particular layout is not quite right. The issue is not change itself. The issue is changing work informally.
Every variation should be documented before the work proceeds, stating the cost, time impact and scope change. This protects both homeowner and builder. Verbal site decisions can quickly become disputed costs, delayed trades and a result that differs from what either party expected.
Judge quality at handover and beyond
Handover should not be the first time you see whether the project has been properly managed. Regular progress communication and inspection records create confidence throughout the build. At completion, the home should be checked for workmanship, operation of services, finishes and any items requiring rectification.
Collect the documents that matter: permits, compliance records, warranties, appliance information and maintenance guidance. Ask how to care for timber finishes, stone, painted surfaces, waterproofed areas and external cladding. A quality renovation is built for daily use, but every home benefits from proper maintenance.
The most valuable decision you can make is to slow down before construction begins. Give the design, scope and technical details enough attention to be built properly. A renovation should not merely look complete on handover day – it should remain sound, comfortable and dependable long after the dust has cleared.