By Blue Horizon Projects · · 9 min read
Contents
Costs quoted around a barbecue are almost always for a different house on a different block. These ranges are what we see across Central Coast projects in 2026, and they are for planning only - a genuine figure needs a site visit.
Indicative build rates
| Level | Indicative rate | Typical scope |
|---|---|---|
| Considered standard | $3,200 – $3,900 / m² | Level block, efficient plan, quality volume-builder finishes |
| Custom | $3,900 – $5,000 / m² | Bespoke design, raked ceilings, upgraded joinery and glazing |
| High end | $5,000+ / m² | Architectural detailing, stone, premium glazing, complex sites |
What site costs really add
- Demolition and disposal on a knock down rebuild
- Excavation, retaining and rock removal on sloping blocks
- Stormwater, sewer connections and driveway crossings
- Bushfire (BAL) or flood-related construction requirements
- Scaffolding and crane access on tight streets
Where budgets slip
Rarely on the structure. Nearly always on selections, late design changes and items excluded from the original scope - landscaping, fencing, window furnishings and driveways being the classic four.
Budget the whole project, not just the build contract. The house is roughly 80% of what you'll actually spend.
Building a budget that holds
Work back from what you can comfortably fund, subtract 10% for contingency, then design to what's left. Designing first and pricing later is how projects stall.
Frequently asked
- How much does it cost to build a 4 bedroom house on the Central Coast?
- As a planning range, a 220–250m² custom four bedroom home commonly lands between $850,000 and $1.2 million plus site costs, depending on finish level and block conditions.
- Are site costs included in a builder's quote?
- Sometimes as provisional sums. Ask which site costs are fixed and which are allowances - that difference is where most surprises live.
- How much contingency should I allow?
- We suggest 8–10% of the build cost, held separately from your selections budget.
