Home Extension Approval in NSW — CDC vs DA
Most home extensions in NSW require either CDC or DA approval. Small internal renovations (no structural changes, no change to external appearance) may be Exempt Development requiring no approval. Buildana (Lic. 487805C) navigates all approval pathways.
CDC for Extensions
CDC is available for extensions that comply with the Housing Code: • Extension does not exceed height limits (8.5m/2 storeys) • Extension complies with all setbacks • Block is not heritage-listed or in conservation area • Block is not flood-prone or BAL-40+ bushfire • Extension does not change the number of dwellings
Timeline: 10–15 business days. Cost: $3,000–$6,000.
Most single-storey rear extensions in Western Sydney qualify for CDC. First floor additions are more complex — they often exceed Housing Code parameters and require DA.
DA for Extensions
DA is required when CDC criteria are not fully met. Common triggers: • First floor addition that exceeds building envelope • Heritage area • Flood-prone land • Non-compliant setbacks (e.g., side setback less than 0.9m)
DA processing: 40–90 days. Cost: $5,000–$12,000.
Buildana manages the full approval process. Contact us for a free assessment.
