Pick a new custom build (or a knockdown–rebuild) when you want a layout that suits how you live, strong energy performance, and a predictable, milestone-driven program. Choose a renovation/extension when you’re preserving character or a valued façade provided the structure is sound and the scope stays contained.

How builders actually help (without the fluff)

• Plan the path: feasibility, design coordination, permits, documentation, selections, construction, handover.
• Balance design with rules: orientation, glazing and insulation for comfort; heritage and neighbour considerations where they apply.
• Run the program: stage dates from site start → frame → lock-up → fixing → practical completion, with inspections and weekly updates.

Renovate or build new? A practical way to decide

Signs you’ll be happier with a new custom build (or KDR)

• The existing plan fights daily life (poor light, chopped rooms, no storage).
• You want energy performance baked in rather than piecemeal retrofits.
• Major structural changes, full services upgrades or compliance items keep stacking up.
• You prefer clear milestones and a tidy defects close-out.

When a renovation/extension still makes sense

• You’re keeping period features and street characters that truly matter.
• The shell is sound, and the scope is targeted (kitchen/baths, modest re-planning, one addition).
• Heritage or neighbourhood controls favour retain-and-extend over rebuilding.

if the “simple reno” grows into heavy structure and complete services replacements, price a side-by-side: big reno vs KDR. Many owners find the clean-slate build delivers better comfort and long-term value for a similar total outlay.

Melbourne specifics that shape the choice

• Heritage areas (e.g., Middle Park; parts of Kew/Hawthorn): façades and rooflines face extra scrutiny and resolve early in concept.
• Bayside exposure (Brighton, Albert Park): wind and salt call for corrosion-resistant fixings and careful detailing.
• Inner-urban access (South Yarra, Port Melbourne): cranes, deliveries and shared lanes affect program and cost.
• Sloping or narrow blocks (various suburbs): allow for engineering, retaining and site logistics from the start.

Knockdown–rebuild in brief

Love the street but not the house? KDR removes unknowns in old fabric and gives you a plan optimised for light, storage, energy and flow on the same address.

Typical steps: site assessment → demolition approvals → design & permits → staged build → handover.

Budget and risk signals (for either path)

• Inclusions schedule: compare quotes like-for-like; avoid vague allowances.
• Selections before contract: fixtures/finishes/systems chosen early to match the budget.
• Variation process: every change logged with cost/time impact before it proceeds.
• Milestones with dates: site start → frame → lock-up → fixing → PC; who communicates what and when.
• Stage inspections: frame, pre-plaster/waterproofing, fixing, and PCI with a clear standard for “done”.