The terms 'property valuer' and 'property appraiser' can sometimes be used interchangeably, but they represent distinct roles depending on the context and the country. In Australia, 'property valuer' is the commonly used term, while 'property appraiser' is more prevalent in countries like the United States. Here's the real difference:

1. Qualification and Regulation

- Property Valuer (Australia)

  - A valuer is a **licensed professional** who has undergone formal education and training, often with tertiary qualifications in property or valuation.  

  - Valuers are required to adhere to strict industry standards and are regulated by professional bodies like the **Australian Property Institute (API)**.  

  - They conduct valuations for legally binding purposes such as taxation, mortgage security, insurance, litigation, or government reporting.

- Property Appraiser (US and other regions)

  - Appraisers typically require certification, but the level of training and regulation may vary by state or country.  

  - Their role is less regulated in some regions compared to valuers in Australia, though appraisers in the US must comply with the **Uniform Standards of Professional Appraisal Practice (USPAP)**.

2. Purpose of the Assessment

- **Valuer**  

  - Produces detailed, legally recognized valuation reports that include comprehensive analysis and a defensible opinion of market value.  

  - Valuations are often required for high-stakes purposes, such as court cases, compulsory acquisitions, or loan underwriting.  

- Appraiser 

  - Provides a property appraisal, which is typically a less formal estimate of value, often used for real estate transactions.  

  - Appraisals are more commonly used by real estate agents or for pre-listing purposes, rather than legal or financial matters.

3. Scope of Work and Detail

- **Valuer**  

  - Conducts in-depth research using sales data, market trends, zoning laws, and property-specific characteristics.  

  - A valuer's report is typically comprehensive, backed by detailed justifications and methodologies.  

- **Appraiser**  

  - Focuses on providing a market-driven opinion of value based on comparable properties and current market trends.  

  - Appraisals are often quicker and less detailed than a formal valuation.  

4. Use in Practice**

- **In Australia:**  

  - The term "property valuer" is preferred, and the role is considered highly specialized, with valuations used for purposes like tax, insurance, and legal disputes.  

- **In the United States:**  

  - "Property appraiser" is more common, often tied to real estate transactions, with a focus on market-based assessments rather than comprehensive legal valuations.

Key Takeaway**  

- Property Valuer: Highly qualified, regulated, and provides legally recognized valuations.  

- Property Appraiser: Offers a more informal or transaction-based value estimate, often for real estate purposes.  

In professional contexts, particularly in Australia, it's critical to engage a **valuer** for matters requiring formal certification and legal credibility.