Hornsby Shire Council · DA

21 Northumberland Avenue Mount Colah — Secondary dwelling

View on NSW Planning Portal

DETERMINED

Overview

Address: 21 Northumberland Avenue Mount Colah 2079
Portal application no.: PAN-642151
Council reference: DA/56/2026/A
Application type: Modification Application
Development types: Secondary dwelling; Erection of a new structure
Estimated cost: $245,000
New dwellings: 1
Determination authority: Council staff under delegated authority

Key dates

Lodged: 27 May 2026
Exhibition starts: 2 June 2026
Exhibition ends: 16 June 2026
Determined: 1 July 2026

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Source: NSW Planning Portal (opens in a new tab). Look this application up with its portal number PAN-642151 or council reference DA/56/2026/A.