---
title: "James Thornton | Duplexcost Expert Author"
description: "Read the profile of James Thornton, Quantity Surveyor & Cost Analyst at Duplexcost. View credentials and published landscaping guides."
source: DuplexCost
sourceUrl: https://duplexcost.com/authors/james-thornton/
lastUpdated: 2026-07-01
citationUrl: https://duplexcost.com/authors/james-thornton/
---

# James Thornton

Read the profile of James Thornton, Quantity Surveyor & Cost Analyst at Duplexcost. View credentials and published landscaping guides.

Quantity Surveyor & Cost Analyst

Maintains suburb-level cost databases covering 735+ suburbs and 8 capital cities. Validates calculator models against Rawlinson's, HIA, and ABS data quarterly.

Led estimating team for 40+ residential projects annually. Developed internal benchmarking tools used across 3 state offices.

© 2026 DuplexCost. A Hustle Ventures product.

## About

## Professional Experience

## Key Achievements

## Publications

## Articles by James Thornton

#### Guides

#### Company

## Key Points

- Contributed cost data to the Rawlinson's Australian Construction Handbook (Editions 31–33)
- Built the composite cost model behind HomeBuildBudget — validated against 4 independent industry sources
- Suburb-Level Cost Variation in Australian Residential Construction HIA Housing Summit Conference Paper, 2023
- Cost to Build a Duplex in Australia: 2026 Price Guide How much does it cost to build a duplex in Australia? Compare national construction costs, attached vs detached premiums, site works, and hidden developer fees. 2026-06-18
- Cost to Build a Duplex
- CDC Duplex Requirements
- Best Sydney Builders
- Best Melbourne Builders
- Calculator
- Locations

---
*Source: [DuplexCost](https://duplexcost.com/authors/james-thornton/)*