Renovations and Extensions: The Real Obstacles
What actually happens on site and in council - from real Melbourne projects
Renovations and extensions rarely go exactly to plan, and that’s not a failure — it’s the process working properly. A good design responds to what a site and a council actually allow, not just what a client first imagined. Here are some real, recent examples of what that looks like in practice.
When Scope Genuinely Changes Mid-Project
A recent Elwood renovation began as a simple, modest project: a single-storey extension. Partway through planning, it grew into a two-storey addition. After council pushback and objections from neighbours, it was scaled back again to a single-storey proposal. The complication driving much of this was a flood zone requiring raised floor levels, which made the resulting wall heights and side setback genuinely difficult to achieve within what council and the neighbours would accept.
At that point, the client faced a real decision: fight the scaled-back outcome at VCAT, with no guarantee of winning, or accept the single-storey proposal and the cost savings that came with it. We talked through both options honestly. There’s no universally right answer here — it depends on the client’s appetite for risk, time, and the amount at stake. In this case, accepting the compromise was the better outcome, but that won’t always be true.
Smart Design Can Avoid an Expensive Compliance Pathway
On a project in Elwood, a bathroom layout was redesigned — simply by changing the door placement — specifically to satisfy Victorian waterproofing requirements (now administered by the Building and Plumbing Commission, formerly the Victorian Building Authority) without needing what’s called a Performance Solution. A Performance Solution is the more complex, costlier compliance pathway used when a design can’t meet the standard deemed-to-satisfy requirements directly. Getting the layout right the first time avoided that entirely. This is a good example of where design skill has a direct, measurable effect on cost, not just aesthetics.
On the same project, a builder suggested removing decks and ramps from the plan to save money, since it would avoid the need for screw piles. It’s worth being honest about this kind of suggestion: if those elements are ever added later under a separate permit, the underlying site condition hasn’t changed — screw piles will still be required then. Removing something from scope doesn’t remove the constraint, it just defers when you pay for it.
Not Everything Needs Full Engineering
Good design also means knowing where engineering input is genuinely needed and where it isn’t. On a front fence project, only the footings and columns were engineered, with the remainder of the construction left to the fence builder. Over-engineering a simple element adds cost without adding value; under-engineering the parts that actually carry load is where problems start. Knowing the difference matters.
The reverse is true for a feature staircase with a steel structure and glass balustrade, which required full structural engineering sign-off to the relevant Australian Standard. That work involved coordinating the builder, the structural engineer, and a specialist stair fabricator together — and before fixing anything into the floor, the concrete slab was scanned to check for hidden services in that area first. A small step, but the kind of thing worth doing before drilling into a floor you can’t easily undo.
Site Conditions Can Genuinely Surprise You
On a recent Croydon project, an arborist report identified several trees on site, including one the client wanted to retain. The real question wasn’t just whether the tree could stay — it was what retaining it would mean for future access, such as a driveway or shed entry. On closer inspection, other already-removed boundary trees left enough room for a driveway without needing to touch the retained tree at all. Tree protection and practical site planning don’t have to work against each other, but it takes a proper look at the site to find that out.
Soil conditions can surprise you too. A geotechnical engineer’s soil report isn’t always final on first issue — on one project, a query about the report’s bearing conditions led to it being revised based on what was actually observed on site. And this isn’t unique to any one suburb: flood overlays, poor soil, and similar site-specific issues turn up across many parts of Melbourne, not just the areas most commonly associated with them. The real lesson is general: understand your specific site’s conditions before you commit to a project, whatever suburb you’re in.
Sometimes It Genuinely Moves Fast
It’s worth being honest that not every project takes years. A recent planning application in Prahran — lodged in March 2025 — received its decision in late April 2025, roughly seven to eight weeks later. That’s a useful counterpoint to the longer, more complicated approvals that tend to make for more memorable stories: timelines vary enormously depending on complexity, council workload, and whether objections are received, not on some fixed rule of thumb.
The Real Lesson
Renovations and extensions rarely unfold exactly as first imagined, and that’s normal. What matters is how each obstacle gets handled — whether scope changes are managed honestly, whether design decisions are used to avoid unnecessary cost and complexity, and whether the site’s real conditions are understood properly before committing to a plan.
If you’re weighing up a renovation or extension and want to understand your site’s specific risks before committing, the Pre-Purchase Planning & Risk Report is designed for exactly that. You can also read more in the FAQ about planning permits, overlays, and the approval process.
Sources: Mancini Design project records from Elwood, Croydon and Prahran.