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Tax Depreciation Basics · Koste Knowledge Base

Can a quantity surveyor estimate construction costs for Division 43?

Published 26 June 2026 · Last updated 26 June 2026

Quick Answer

Yes, where actual construction costs are not available, a qualified quantity surveyor may estimate eligible construction costs for Division 43 capital works. This is one of the key reasons investors use a tax depreciation schedule.

Many investors do not know the original construction cost of their property.

This is common when:

  • The property was bought second-hand
  • The property was built years ago
  • Renovations were done by a previous owner
  • Invoices are missing
  • The property is part of a strata complex
  • The investor inherited the property
  • The property has changed use
A quantity surveyor can estimate eligible construction costs using:

  • Property inspection
  • Plans and drawings
  • Building type
  • Construction quality
  • Size and area
  • Age of works
  • Building cost data
  • Renovation evidence
  • Strata information
  • Photos and listing records
This can support Division 43 capital works claims and CGT cost base records.

Frequently Asked Questions

Why can't I just estimate it myself?

A qualified quantity surveyor provides a more supportable construction cost estimate.

Do I need original invoices?

They help, but if unavailable, a QS may estimate eligible costs.

Can previous owner works be estimated?

Yes, where there is enough evidence.

Does this help with CGT?

It may support capital works and cost base records.

Can Koste.ai organise this?

Yes. Koste.ai can collect the information needed for QS review.

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Written by Koste Team · Koste Chartered Quantity Surveyors · AIQS Member · RICS Member · TPB Registered · 1300 669 400 · info@koste.ai