Soft Costs: Definition, Examples & Project Impact

Updated 12 Mar 2026Content was accurate at the time of publication

What are soft costs?

Soft costs are the non-physical, indirect expenses associated with a construction project — the fees, approvals, holding costs and services that support delivery but are not permanently incorporated into the building fabric. In plain terms, if it's not bricks, mortar or plant on site, it's likely a soft cost. Soft costs are typically intangible, variable in timing, and often incurred before and after physical works.

This guide explains what soft costs are, how to budget for them, and how they affect contracts, insurance and tax — helping owners, contractors and project managers control contingency and manage cashflow.

Key characteristics:

Indirect: they support the project rather than form its built outcome.
Non-permanent: usually not capitalised as part of the physical asset (though some may form part of capital works).
Professional and administrative: common examples include design fees, approvals, project management, financing and marketing.
Timing sensitive: many soft costs are front-loaded (pre-construction) or tail-end (post-completion).

Understanding soft costs helps you control contingency, manage cashflow and allocate risks across contracts and insurance.

Soft costs vs hard costs — key differences

Soft costs and hard costs are complementary budget categories for any project. Knowing their differences matters for estimating, contracting, insurance and tax.

Definition:
- Hard costs = tangible construction costs: labour, materials, plant and subcontract works.
- Soft costs = indirect project overheads: professional fees, approvals, finance, marketing.
Permanence:
- Hard costs are incorporated into the finished asset.
- Soft costs are typically not permanently incorporated (exceptions exist for capitalised consultant work).
Budgeting:
- Hard costs are often estimated from quantities and rates.
- Soft costs are estimated as fixed fees, lump sums or percentages of development cost.
Contract classification:
- Contractors often exclude many soft costs from a lump-sum trade price; owners or main contractors usually bear client-side soft costs. See lump sum contract and cost plus contract for differences.
Accounting/tax:
- Hard costs typically form the basis for capital works and depreciation.
- Soft costs may be capitalised or expensed depending on tax rules and the nature of the expense (see ATO guidance below).

For a quick contrast, see hard costs.

Why soft costs matter to project owners

Soft costs can materially affect project viability and timing:

They influence funding requirements and lender assessments.
They create early cashflow pressure (consultant fees, approvals) and end-of-project liabilities (marketing, warranties).
Poorly scoped soft costs drive disputes and contract claims.

Recognising soft costs early reduces refinancing risk, avoids undercapitalisation and improves tender clarity.

Typical categories and examples of soft costs

Soft costs can be usefully grouped by project phase. Below are practical line items you'll encounter in most budgets.

Pre-construction

Design and consultant fees (architect, structural/civil/MEP, specialist consultants)
Feasibility studies and site surveys (geotech, environmental)
Approvals and statutory fees (planning applications, compliance certificates)
Legal and conveyancing fees (land purchases, easements)
Insurance arrangement and brokerage fees
Finance establishment fees and interest during acquisition

Construction

Project management and supervisor salaries or consultant PM fees
Site administration and temporary services (offices, ICT, permits)
Quality assurance, testing and commissioning planning (soft element of commissioning)
Health & safety administration and compliance documentation
Disbursements and statutory inspections (council inspections, certification fees)

Post-construction / Handover

Marketing, sales and leasing commissions
Defects liability administration and warranty management
Final certification and compliance reporting
Operational handover training and manuals

Other recurring/holding soft costs

Taxes and rates during development
Security, temporary utilities and site caretaking
Finance carrying costs and interest during construction (often large line item)
Professional indemnity and specialist insurances

Where appropriate, refer to related topics such as construction insurance and project budgeting.

How soft costs are treated in contracts and procurement

Soft costs raise particular issues in tendering, scope allocation and claims handling. Clear drafting prevents disputes.

Who bears which soft costs?

Client-side soft costs: design fees appointed by the owner, pre-purchase due diligence, marketing and sales costs are normally borne by the owner.
Contractor-side soft costs: site supervision, specialist subcontract supervision and certain commissioning costs are typically contractor responsibilities.
On termination, clauses should specify who bears outstanding consultant fees and costs of demobilisation (commonly disputed items).

Lump-sum vs cost-plus

Lump-sum contracts: contractors typically exclude owner soft costs; any contractor disbursements must be listed. Variations for additional soft costs require clear valuation methods. See lump sum contract.
Cost-plus contracts: soft costs are often passed through, reviewed as disbursements. This reduces contractor risk but increases owner cost variability. See cost plus contract.

Variations and claims

Variations clauses must specify entitlement to associated soft costs (consultant re-design fees, statutory application costs).
Delay claims: contractors and owners should maintain contemporaneous records for ongoing professional and finance costs where delay impacts soft cost accruals.
Payment claims and disputes: soft-cost disbursements should be backed by invoices. If a consultant's fee is disputed, payment schedules and adjudication processes are commonly invoked. See contract variations for related procedural issues.

Drafting tips

Include clear definitions for "soft costs", "disbursements" and "professional services".
Allocate responsibility for pre-contract fees on early termination.
Provide valuation rules for consultant fee variations (hourly rates, fixed fees, percentage caps).
Require evidence and contemporaneous reporting for delay-related soft costs.

Insurance and risk — soft cost coverage

Insurance coverage for soft costs is specialised but critical where delays or damage extend the project timeline.

Types of cover

Soft cost insurance / Delay in Start-Up (DSU): covers loss of net income and additional standing costs if an insured peril interrupts completion (DSU is the common market term).
Delay in Completion cover: may be included in advanced construction policies or available as an endorsement.
Contingent business interruption: for tenants and occupiers facing loss of rental income.
Professional indemnity and public liability: cover consultant errors that lead to extra soft costs (e.g., re-design).

Typical features and limitations

Triggers: damage caused by an insured peril that delays completion; purely contractual delays or labour disputes are usually excluded.
Waiting periods: time excess before indemnity applies (e.g., 14–30 days).
Sum insured and indemnity period: clearly define covered duration and caps — soft costs often require a separate sum insured from the physical damage sum.
Evidence: insurers require detailed proof of additional costs and a causal link to the insured event (contemporaneous invoices, contracts, project schedule updates).
Exclusions: progressive design errors, negligence not linked to an insured peril, or foreseeable pre-existing delays.

Claims considerations

Keep contemporaneous records of consultant invoices, statutory fees, finance charges and communications about delay.
Preserve project schedules (e.g., critical path) to demonstrate delay causation.
Early notification and pre-loss documentation are essential to avoid evidence disputes.

For more on policy forms and market guidance see the Insurance Council of Australia: https://www.insurancecouncil.org.au

Accounting and tax treatment

Soft costs straddle capital and revenue tax treatments. Your accountant will need project details, but the following practical notes guide classification.

Capital vs revenue

Capitalise soft costs that are directly attributable to acquiring, constructing or producing a capital asset (these feed into cost base or capital works).
Expense items that are day-to-day or recurrent operating costs.

Depreciation and capital works

Some consultant fees and capital work costs may qualify under capital works deductions (Division 43). See ATO guidance: https://www.ato.gov.au/business/depreciation-and-capital-expenses-and-claims/capital-works-deductions/
Plant and equipment included as part of construction may attract Division 40 depreciation if recognised as depreciable assets. See: https://www.ato.gov.au/business/depreciation-and-capital-expenses/

GST considerations

Soft cost invoices for a taxable supply attract GST. Owners may be entitled to input tax credits where the purchase relates to a creditable purpose.
Contract structuring affects timing of GST credits — see GST construction for detail.

Record keeping and advice

Maintain a separate ledger for soft costs, retain invoices and contracts.
Because classification affects capital gains, GST and deductions, obtain specific advice from your tax advisor.

Note: this section is general guidance — consult an accountant for project-specific tax treatment.

How to estimate and budget soft costs

Estimating soft costs requires structured checklists and rules-of-thumb. Use these steps to produce a realistic soft-cost allowance.

Estimating checklist

Identify pre-construction items (design, approvals, surveys).
List construction period soft costs (site admin, PM, testing).
Scope post-completion costs (marketing, handover).
Add finance carrying costs based on realistic construction period and drawdown profile.
Include contingency for unforeseen soft costs (document rationale).

Typical percentage ranges (rules-of-thumb)

Residential subdivisions / small apartment buildings: soft costs commonly 8–15% of total development cost.
Medium commercial projects: 10–20% depending on complexity and marketing.
Complex or specialist projects (healthcare, high-end fitouts): 15–25% or higher due to specialist consultants and compliance.
Finance costs are often separately calculated as interest on capital drawn and can be a significant soft cost.

Contingency sizing

Soft cost contingency: 10–20% of estimated soft costs is typical; increase for novel projects.
Hard cost contingency: separate — avoid double counting.

Cashflow sequencing

Map soft cost payments to milestones (design stages, approval lodgement, practical completion).
Anticipate early payments to consultants and security bonds.
Monitor retention and staged payments to preserve liquidity.

Practical tips

Obtain fixed-fee engagements for consultants where feasible to reduce variability.
Use historical data from prior projects to benchmark percentages.
Review soft costs at each procurement milestone and update forecasts.

For procurement methods and their impact on soft costs see project budgeting and contract variations.

How contractors and owners can reduce soft-cost risk

Actionable steps to reduce exposure and improve predictability.

Early procurement and clarity

Engage lead consultants and quantity surveyors early.
Issue a clear brief and scope to reduce design rework.

Contract strategy

Allocate soft costs and disbursements clearly in the contract.
Use fixed-fee consultant contracts where possible.

Integrated delivery models

Consider early contractor involvement or integrated project delivery to align incentives and reduce change orders.

Insurance and warranties

Review DSU/soft cost endorsements with brokers and insurers.
Ensure professional indemnity covers consequential consultant errors.

Reporting and controls

Implement regular cost reporting and change control with escalation protocols.
Require contemporaneous records for delay, invoices and approvals.

Financial management

Match funding drawdowns to the soft cost payment schedule.
Consider hedging finance risk or fixed-rate interest arrangements.

Example soft-cost budget

Illustrative budget for a hypothetical AUD 10,000,000 mid-rise development.

Hard costs: 78% = AUD 7,800,000
Soft costs: 15% = AUD 1,500,000
- Design & consultants: 4% = AUD 400,000
- Approvals & statutory fees: 1% = AUD 100,000
- Project management & site admin: 3% = AUD 300,000
- Finance & interest during construction: 4% = AUD 400,000
- Marketing & sales/leasing: 2% = AUD 200,000
Contingency (soft): 2% = AUD 200,000
Total: 100% = AUD 10,000,000

In this example finance costs are a material soft-cost line and should be modelled from lender rates and drawdown profile. For projects seeking external funding, consider products such as /business/commercial-property-loans and /business/equipment-finance where specialist plant costs are included.

FAQ

Are finance costs a soft cost?

Yes. Interest during acquisition and construction, establishment fees and bank charges are common soft costs. They can be substantial and should be modelled separately.

Do soft costs attract GST?

Soft cost invoices for taxable supplies generally attract GST. Where the expense is for a creditable purpose, input tax credits may be claimable. Refer to ATO GST guidance and GST construction.

Can soft costs be capitalised for tax purposes?

Some can. Costs directly attributable to constructing a capital asset may be capitalised and may attract capital works deductions (Division 43) or depreciation (Division 40) depending on the nature of the expense. See ATO capital works guidance: https://www.ato.gov.au/business/depreciation-and-capital-expenses-and-claims/capital-works-deductions/

What is soft cost insurance?

Often called Delay in Start-Up (DSU), it covers additional standing costs and lost income resulting from an insured event that delays completion. Policy terms, waiting periods and indemnity periods vary — insurers require solid project documentation.

Who pays consultant fees on contract termination?

That depends on the termination clause. Many contracts require the owner to pay for work done to date; some allocate outstanding consultant fees to the party who engaged them. Explicit drafting is essential — see contract variations.

How much contingency should I add for soft costs?

Typically 10–20% of estimated soft costs, increased for novel or complex projects. Keep hard and soft contingencies separate.

Are soft costs included in claims for delay?

Yes, where the delay is caused by an insured or compensable event and you can substantiate additional soft cost accruals with invoices and schedule evidence.

Where can I find more guidance on disputes and payment claims?

Refer to your standard form contract guidance and pages such as contract variations and relevant procurement resources.

Key takeaways

Soft costs are indirect but material expenses that shape project budgets, funding requirements and risk allocation. Distinguishing soft costs from hard costs is essential for accurate estimating, contract drafting, insurance underwriting and tax treatment. Plan soft costs early, maintain clear documentation, and seek specialist advice on contract allocation, insurance coverage and tax classification specific to your project.