Whether you're renovating an apartment in the Inner West or a house in Sydney's suburban belt, the biggest mistake you can make costs far more than you'd expect — and it happens before a single wall is touched.

The Classic Renovation Mistake: Rushing In Without the Right Information

According to registered architect Nikki Quitner, founder of Test Before You Invest , the number one mistake apartment and house renovators make is simple: rushing into a renovation before properly gathering information.

"Spend the money on the right professional upfront," says Nikki. "It might seem like a little more upfront, but it will save you thousands in the long run."

That trickle-down effect plays out in three ways:

Better Return on Investment

Good design doesn't just look nice — it adds measurable value to your property. Nikki cites a client whose $350,000 renovation in 2021 doubled the property's value by 2024.

Better Long-Term Performance

A well-planned renovation accounts for heating and cooling efficiency, material durability, and reduced maintenance over the next 20 years.

Lower Construction Costs

The biggest cost in any renovation isn't the architect — it's the build. Getting the planning right upfront means fewer expensive changes mid-construction.

What Happens When You Skip the Planning Stage

A real Sydney case study illustrates the danger perfectly.

A family in a suburban Sydney home wanted to go from a 3-bedroom, 1-bathroom layout to a 4-bedroom, 2-bathroom open-plan home with a master ensuite. Standard stuff. They decided to skip the architect and go straight to a draftsperson to save money.

The result?

• The proposed rear extension self-shadowed on a south-facing site, reducing natural light throughout the home
• It cut into the garden — one of the main reasons buyers choose suburban Sydney
• Expensive waterproofing, excavation, and footing work was required due to a slope at the rear
• Because the property sat in a conservation area, they needed a full Development Application (DA) through council — adding significant time and cost

The design solution came in at nearly three times the client's budget.

When Nikki's team assessed the same property, they identified something the draftsperson missed: the existing footprint was large enough and inefficiently laid out enough that everything the family wanted could be achieved without any extension at all. No DA required. No excavation. No lost garden.

The Two Things Renovators Always Underestimate: Cost and Time

It's not a mystery. Ask any renovator after the fact and they'll tell you: it cost more and took longer than they expected.

Nikki is upfront about this with every client: "I know you want to do it in 3 to 6 months, but really if you're going to do this properly, it's going to be a year."

That's not bad news — it's protection. Starting a renovation before you're ready often means double the time and double the cost when mistakes surface mid-project.

What Does "Good Bones" Actually Mean?

The phrase gets thrown around constantly in Sydney real estate, but what does it really mean?

"Good bones means the house is strong enough to withstand a renovation without fighting it." — Nikki Quitner, Registered Architect

A double-brick home, for example, is a thermal fortress. Its perimeter structure can often support a second storey addition, allows significant internal reconfiguration, and provides durability and weatherproofing that newer builds often can't match. When a property has good bones, your renovation budget goes further — you're not fighting the structure, you're working with it.

South-Facing Sites: Not Always a Deal-Breaker

One of the most common knee-jerk reactions in Sydney property? Dismissing a south-facing block outright.

But a south-facing site 17 metres wide is a different proposition than a narrow one. Courtyards, atriums, side setbacks, skylights, and clerestory windows can all be used to bring east and west light deep into a home. Nikki's team uses solar diagrams and winter solstice modelling (June 21 — the shortest day of the year) to test how a design performs at its worst. If it stacks up on the winter solstice, the rest of the year is only better.

The result? Properties purchased at a discount because of their aspect, transformed into light-filled homes that leave buyers asking: "Are you sure this is south facing?"

What Is "Test Before You Invest"?

Nikki Quitner's service is built around democratising architecture — making professional architectural advice accessible before you're locked into a purchase or a contract.

For a few hundred dollars (rather than the tens of thousands typically required to engage an architect on a full project), clients can access a preliminary assessment that covers four key questions:

1. Can my brief be met? What are the design opportunities for this property?
2. What will it cost? Not just construction, but total cost of works — architect fees, approval costs, consultant fees.
3. How long will it take? From first steps to completion.
4. How do we get it approved? CDC (Complying Development Certificate) or DA through council?

No commitment. No lock-in. Just the information you need to decide whether to buy, what you can realistically do, and what it's actually going to cost.

Is Flipping Still Worth It in Sydney?

Short answer: yes, but the margin for error has shrunk.

"Flipping isn't dead, but it's no longer forgiving. You've got to be really smart about how you flip." — Nikki Quitner

That means finding creative solutions — properties others have overlooked, south-facing sites with untapped potential, homes with inefficient layouts that disguise a generous footprint. The deals are still there. You just need to know what you're looking at.

The Bottom Line for Sydney Renovators

Whether you're a first home buyer eyeing a fixer-upper, a seasoned investor looking to flip, or someone wanting to transform a property into a forever home — the advice is the same:

Plan, plan, plan. Then start your renovation.

The upfront investment in proper professional advice is small compared to what it saves — in cost blowouts, in delays, in design decisions that devalue rather than add value.

There's nothing more rewarding than a home designed specifically for you. But to get there, you have to be willing to hear what you might not want to hear first.