Renovate or Knock Down? How to Decide in 5 Minutes Flat

It's the most common crossroads in Sydney housing: you love the street, the schools and the neighbours, but the house is tired. Renovating feels cheaper. Rebuilding feels cleaner. Here's how to think it through before you spend a dollar on either.

Question 1: How Much of the House Are You Keeping?

The brutal rule of thumb: if you're changing more than 50–60% of the home — new kitchen, bathrooms, layout, roof, extension — the renovation usually costs as much as a new build, delivers a compromised result, and takes just as long. Renovation economics work when the bones stay.

Question 2: What's the Structure Actually Worth?

Pre-1980 homes often hide expensive problems: failing stumps or footings, asbestos sheeting, degraded wiring, terracotta drainage at end of life. A renovation inherits all of it. A rebuild deletes it. Get a building inspection before deciding — $600 now can save a $150,000 mistake.

Question 3: Does the Layout Fight You?

Cosmetic problems are renovation territory. Structural layout problems — living areas facing the wrong way, ceilings too low, rooms too small to combine — are rebuild territory. Moving loadbearing walls costs disproportionately more than people expect.

Question 4: What Do the Numbers Say?

• Major renovation + extension in Sydney: commonly $400,000–$800,000 — with real blowout risk from hidden conditions
• Knock down rebuild: from ~$950,000 all-in — but with cost certainty and a 60-year asset at the end
• The resale gap: a new home typically values higher than a renovated old one of the same size, on the same street

Question 5: Can You Live Through It?

Renovations with owners in residence run slower, cost more and strain families. If you'd need to move out anyway, one of renovation's biggest advantages disappears.