What Does a Quantity Surveyor Do? An Australian Property Investor's Guide

Most Australians first hear the term "quantity surveyor" from their accountant, usually in a sentence that starts "you should really get a depreciation schedule". At that point it sounds like a piece of professional jargon standing between you and a tax deduction.

It is worth understanding properly, because a quantity surveyor is one of the very few professionals the ATO effectively nominates by name and because the depreciation schedule most investors know about is only one of several things a QS actually produces.

What does a quantity surveyor do?

A quantity surveyor is a construction cost specialist who measures, estimates and reports on the cost of building work. In the Australian property investment context, a quantity surveyor's main job is to determine the historical construction cost of a building and its assets so that the owner can claim depreciation deductions correctly. Quantity surveyors also prepare construction cost reports for lenders, insurance replacement cost assessments, progress claim certifications, and scrapping schedules for renovated properties.

The profession is regulated through the Australian Institute of Quantity Surveyors (AIQS), and QSs preparing tax depreciation schedules must also be registered tax agents.

Two very different worlds

Confusion about the role usually comes from the fact that quantity surveying splits into two quite separate streams.

Construction quantity surveying happens before and during a build. The QS prepares bills of quantities, tender documents and cost plans, tracks variations, certifies progress claims, and advises on cost control. Their client is typically a developer, builder, architect or financier.

Property and taxation quantity surveying happens after a building exists. The QS works backwards inspecting a completed property and reconstructing what it cost to build, so that value can be allocated across depreciable items and claimed over time.

If you own an investment property, you almost certainly need the second kind. If you are building or funding a development, you probably need the first.

What a quantity surveyor does for property investors

1. Tax depreciation schedules

This is the service most investors encounter. A tax depreciation schedule is a document setting out every deduction available on an investment property, year by year, usually across a 40-year horizon.

The QS inspects the property, identifies and measures the building structure, and separately identifies every removable asset carpet, blinds, appliances, hot water systems, air conditioning, light fittings. Those two categories are then depreciated under different rules, which we cover in detail in Division 40 versus Division 43.

The structural component the capital works deduction is typically claimed at 2.5% per year for 40 years from construction. The removable assets depreciate faster, over their individual effective lives.

For a typical newly built two-bedroom apartment in Brisbane or Melbourne, first-year deductions frequently land somewhere between $8,000 and $15,000. On an older established house they may be considerably lower. Our guide to how much you can actually claim works through realistic examples.

2. Construction cost reports for lenders

If you are funding a build, your lender will not release progress payments on trust. A construction cost report gives the financier an independent view of whether the contract price is reasonable, whether the work completed matches what has been claimed, and whether the remaining budget is sufficient to finish.

For private and non-bank lenders in particular, this report is often a condition precedent to drawdown. See our overview of what a QS cost report covers.

3. Insurance replacement cost assessments

Underinsurance is one of the quieter risks in Australian property. Building costs have moved substantially, and a sum insured set five years ago may no longer rebuild the property.

A quantity surveyor prepares an insurance replacement cost assessment calculating what it would cost to rebuild today, including demolition, professional fees, escalation during the rebuild period, and compliance upgrades to current standards. This is a different exercise to a market valuation, see insurance replacement cost reports explained. It matters especially for strata schemes, where the owners corporation carries a statutory obligation to insure for replacement value.

4. Scrapping schedules for renovations

This one is routinely missed. When you renovate an investment property and remove items that still have nondeductible value the old kitchen, the old carpet, the old air conditioner the residual written-down value of those assets can generally be written off in the year of removal.

To do that you need the assets identified and valued before they go in the skip. A QS inspection prior to demolition can convert what feels like a sunk cost into an immediate deduction. Once the items are gone, the opportunity is usually gone with them.

5. Progress claim certification

For developers and builders, the QS acts as an independent umpire on whether claimed work has genuinely been completed to the value claimed protecting the financier, and often the developer, from disputes later.

Why the ATO effectively requires a quantity surveyor

Here is the part that surprises people. If you do not know what a building actually cost to construct because you bought it second-hand, or the records are long gone you cannot simply estimate it yourself.

Tax Ruling TR 97/25 sets out that where construction costs are unknown, they must be estimated by an appropriately qualified person. The ATO specifically identifies quantity surveyors as having that expertise for construction cost estimation. Accountants, valuers and real estate agents are not regarded as qualified to make that estimate.

This is why your accountant refers you out. It is not that they cannot do the tax return it is that they cannot lawfully produce the underlying cost estimate that the return relies on.

Quantity surveyor, valuer or building inspector?

These three are regularly confused. They answer completely different questions.

Professional	Core question answered	Typical output	Common use
Quantity surveyor	What did it cost to build, and what can be depreciated?	Depreciation schedule, cost report	Tax deductions, lender drawdowns, insurance sums
Property valuer	What is it worth on the open market today?	Valuation report	CGT, stamp duty, family law, SMSF, lending
Building inspector	What condition is it in, and what is wrong with it?	Inspection report	Pre-purchase, stage inspections, defects

A useful shorthand: the valuer tells you what someone would pay for it, the quantity surveyor tells you what it cost to make, and the inspector tells you whether it is any good.

What does a quantity surveyor cost?

For a residential tax depreciation schedule, typical Australian fees sit between $600 and $900 for a standard house or apartment, with commercial and multi-dwelling properties costing more. Construction cost reports for lenders generally start around $1,500 and scale with project size and the number of progress inspections required.

The fee itself is normally deductible, and for most investment properties the first year of deductions comfortably exceeds it. Where it does not an older, unrenovated property with little remaining structural life and no significant assets a reputable QS will tell you before charging you. That is a reasonable test of whether you are dealing with a good one.

What actually happens: a typical timeline

1. Day 1 Engagement. You provide the address, purchase date, settlement details, and any construction or renovation records you have.

2. Days 2-5 Inspection. A qualified inspector attends, measures the building, photographs and records every depreciable asset, and notes renovations. Tenants are given proper notice; you do not need to be present.

3. Days 5–10 Preparation. Construction costs are estimated where records are unavailable, assets are allocated to the correct categories and effective lives, and the schedule is compiled under both the diminishing value and prime cost methods.

4. Delivery. You receive the schedule and forward it to your accountant. It is a one-off document it does not need to be redone each year unless you renovate or the property's use changes.

If you have owned the property for several years without a schedule, you have not necessarily missed out. Amended returns are often possible see how far back you can claim depreciation. And if you would rather not wait until tax time to see the benefit, a PAYG withholding variation can bring it forward into your regular pay.

When you probably don't need one

Being honest about this matters more than upselling:

• The property is owner-occupied and produces no income.

• The property was built before 1987 with no renovations since, and contains few depreciable assets. (Check anyway renovations by previous owners still count, even if you did not pay for them.)

• You already hold a schedule and nothing has changed. Schedules do not expire.

• You are buying an established property and have not yet settled. Wait until it is yours and income-producing.

Frequently asked questions

What does a quantity surveyor do?

A quantity surveyor measures and estimates construction costs. For property investors, they prepare tax depreciation schedules, construction cost reports for lenders, insurance replacement cost assessments, and scrapping schedules for renovated properties.

Do I really need a quantity surveyor for a depreciation schedule?

If the actual construction cost is unknown, yes. Tax Ruling TR 97/25 requires the estimate to be made by an appropriately qualified person, and the ATO identifies quantity surveyors as qualified for construction cost estimation. Your accountant cannot make that estimate for you.

What is the difference between a quantity surveyor and a valuer?

A quantity surveyor determines construction cost for depreciation and insurance purposes. A valuer determines market value for tax, legal, lending and settlement purposes. Many investors need both at different points.

How much does a quantity surveyor charge for a depreciation schedule?

Typically $600 to $900 for a standard residential property in Australia, with commercial properties costing more. The fee is generally deductible.

How long does a depreciation schedule last?

Usually 40 years from construction, and it does not need to be renewed annually. You only need a new or updated schedule if you renovate substantially or the property's use changes.

Can a quantity surveyor inspect a tenanted property?

Yes. Inspections are arranged with the tenant under the notice requirements of the relevant state tenancy legislation. You do not need to attend.

Does a quantity surveyor visit the property?

For a compliant tax depreciation schedule, a physical inspection is the accepted standard. Be cautious of providers offering schedules with no inspection at all.

Talk to a quantity surveyor about your property

Propti provides AIQS-qualified quantity surveying services Australia-wide tax depreciation schedules, QS reports, construction cost reports and insurance replacement assessments with fixed pricing quoted up front.

If you are not sure which report you need, tell us about the property and we will tell you honestly whether it is worth doing. Book in a report, or explore more guidance at Propti Property Insights. Accountants and advisers can also review our referral options for tax professionals.

This article provides general information only and does not constitute taxation, financial or legal advice. Depreciation outcomes depend on individual circumstances and current legislation. Fee ranges are indicative and are not quotes. Please consult a registered tax agent regarding your situation.