Do You Need a Class 3 Estimate for DA Approval?

Where the cost estimate fits in a development application

Every development application carries an estimated cost of development, and it does more work than most applicants realise. Council uses that figure to calculate the DA fee itself, and, above certain thresholds, development contributions under s7.11 and s7.12 of the planning legislation, levies that are charged as a percentage of the cost of works. Understate the number and council can challenge it or require an independent estimate, stalling the application. Overstate it and the fees and levies are calculated off the inflated figure. Either way, a defensible number, prepared off the actual concept drawings rather than guessed, pays for itself at lodgement.

What councils actually ask for

Requirements step up with project size, and the thresholds vary by council, so the DA checklist for your local government area is the authority. As a common NSW pattern: small works can state a cost with minimal supporting detail; mid-size projects typically need a cost summary report on the council's standard form, prepared by a suitably qualified building industry professional; and larger developments, commonly above the $3 million mark, need a detailed cost report certified by a registered quantity surveyor. The estimate behind all three is the same discipline: measured or benchmarked quantities and current market rates applied to the proposal as drawn.

Why a Class 3 estimate is the right tool at DA stage

At DA stage the design is a concept: plans and elevations exist, but the specification, services detail and structural documentation don't. A Class 3 Budget Estimate is built for exactly this stage of documentation, an accuracy band of roughly -20% to +30%, priced against a stated specification assumption. That is precise enough to set DA fees and contributions on a defensible basis, and to tell you whether the project is feasible, without paying for tender-grade measurement of a design that will change before construction certificate anyway.

The same number does double duty

A DA cost estimate prepared properly isn't just paperwork for council. It's the first real test of feasibility: lenders ask for a cost basis before funding, and a developer comparing the estimate against the revenue side of the project finds out at DA stage, not at tender, whether the numbers work. Projects that skip this step tend to discover the gap after the design is documented, when changing course is expensive. The habit of checking what sits behind the number applies here as much as at tender.

Who should prepare it

For most DAs, an experienced construction estimator working from your concept drawings can prepare the estimate and the cost summary report. Where a council requires certification by a registered quantity surveyor for larger projects, HYKSOS prepares the measured estimate and works alongside certified practising quantity surveyors so the report carries the sign-off the council asks for. Either way, the figure should be traceable: quantities from the drawings, rates from the current market, assumptions written down.