---
title: "Duplex Cost Calculator | Free Feasibility & Dual Occupancy Estimates"
description: "Calculate the true turnkey cost to build a duplex in Australia. Estimates demolition, site works, civil engineering, utility runs, and council levies."
source: DuplexCost
sourceUrl: https://duplexcost.com/
lastUpdated: 2026-06-18
citationUrl: https://duplexcost.com/
---

# Discover the True Cost of Your Duplex Project

Calculate the true turnkey cost to build a duplex in Australia. Estimates demolition, site works, civil engineering, utility runs, and council levies.

Exquisite premium Angled Corner Block Plan design optimized for Australian building standards.

Exquisite premium Mixed Texture Duplex Siding design optimized for Australian building standards.

Exquisite premium Integrated Home Office Nook design optimized for Australian building standards.

© 2026 DuplexCost. A Hustle Ventures product.

#### Launch Cost Calculator

#### Launch Cost Calculator

#### Launch Cost Calculator

#### 1-Bedroom Compact Plan

#### 2-Bedroom Family Plan

#### 3-Bedroom Double-Story Plan

#### Luxury Loft Split-Level

#### Compact Studio Plan

#### Launch Cost Calculator

#### Multi-Dwelling Duplex Plan

#### Accessible Single-Level Plan

#### Custom Architectural Plan

#### Eco-Friendly Solar Plan

#### Modular Prefab Panel Plan

#### Interlocking Structural Plan

## Key Points

- Cost to Build a Duplex
- CDC Duplex Requirements
- Best Sydney Builders
- Best Melbourne Builders
- Calculator
- Locations
- How We Calculate
- Data Sources
- AI Information
- Our Team

## Frequently Asked Questions

### Ready to Assess Block Feasibility?

Run our live, independent duplex calculator and get an instant itemized cost and rental yield estimate.

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*Source: [DuplexCost](https://duplexcost.com/)*