Home extension planning
List room functions, site constraints and what should remain usable during construction. Ask what each design stage delivers.
This guide has a checked price reference. Verify the source scope and availability before using it. How prices are checked
Published price reference
$1,200 per study ex GST (AUD) · OIC Architects residential feasibility study
Sydney architecture practice. The fee is credited against design if the project proceeds under its terms. Design and construction are separate.
OIC Architects · Checked 13 November 2026.
Build a budget from your quote
Separate feasibility, measured design, approvals and construction.
NSW Planning guidance on when council consent is required · Checked 13 November 2026.