Determined This application has been determined. Contact Hornsby Shire Council if you want to understand or challenge the decision. Some decisions can be appealed to the NSW Land and Environment Court, and who can appeal depends on the type of development.

Lodged 27 May 2026 On exhibition 2 June 2026 Under assessment Determined 1 July 2026

Status 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

Source: NSW Planning Portal (opens in a new tab). The tracker searches by address, not by application number. Quote its portal number PAN-642151 or council reference DA/56/2026/A when you contact Hornsby Shire Council.