Victorian planning resource · $39 planning report

Can I build two units (dual occupancy) in Victoria?

Two dwellings on one lot — a 'dual occupancy' — needs a planning permit in Victoria, assessed under Clause 55 (ResCode). The make-or-break number for most blocks is the mandatory garden area requirement. Here's what's required, and a fast way to check your lot.

Victorian homeowners and small developers assessing whether their block can take a second dwelling or a pair of townhouses — before committing to a designer.

Check your dual-occ potential — $39 Free Property Snapshot

Two dwellings = a planning permit under Clause 55

Constructing two or more dwellings on a single lot in a residential zone needs a planning permit, assessed under Clause 55 of the planning scheme — the ResCode standards for multi-dwelling development up to four storeys. Clause 55 covers neighbourhood character, site layout, building height, setbacks, site coverage, private open space, overlooking and car parking. (A single new dwelling is assessed under Clause 54; three or more on a lot or in larger developments may engage Clause 58 for apartments.)

A planning permit is required for two or more dwellings on a lot
Assessed against Clause 55 (ResCode) — the multi-dwelling standards
Site coverage generally up to 60%; minimum permeability around 20%
Each dwelling needs private open space and compliant car parking
Setbacks, overlooking and overshadowing standards apply to protect neighbours
The mandatory garden area requirement applies on lots over 400 m²

The garden area requirement — the usual deal-breaker

Victoria's mandatory garden area requirement is the standard that most often decides whether two dwellings fit. On lots over 400 m² in the General, Neighbourhood and Residential Growth zones, a minimum percentage of the lot must be set aside as garden area (uncovered, deep-soil-style open space) that can't be built on:

Lots above 400 m² and up to 500 m² — 25% garden area
Lots above 500 m² and up to 650 m² — 30% garden area
Lots above 650 m² — 35% garden area
The requirement is mandatory — a permit cannot be granted if it isn't met
It applies to the construction of dwellings, including a second dwelling

What else decides a dual occupancy

Beyond garden area: neighbourhood character is central — Clause 55 asks whether the development respects the established and preferred character of the street. Overlays matter too (heritage, significant landscape, vegetation), as does the zone — the Neighbourhood Residential Zone is the most restrictive and some schedules limit dwelling numbers or set a maximum building height; the General and Residential Growth zones are more accommodating.

Plan a dual occupancy with subdivision in mind: most owners build two dwellings under Clause 55 then subdivide so each is on its own title. The two are separate permits, usually pursued together.

Check your lot before you design

Whether two dwellings fit depends on your lot size, zone and overlays — and the garden area maths. Our $39 Victorian planning report identifies your zone, overlays and the controls that apply, with a plain-English read on dual-occupancy potential.

Start free with the Property Snapshot to confirm your zone and overlays.

Real example

Worked example

A 650 m² General Residential Zone lot with no overlays needs 30% (≈195 m²) as garden area; with two single-storey units that's usually achievable. Drop to a 480 m² lot needing 25% and add a Heritage Overlay, and the same two-unit scheme becomes a much tighter, character-sensitive proposal.

The statutory basis

Two or more dwellings on a lot are assessed under Clause 55 (ResCode) of the Victoria Planning Provisions, made under the Planning and Environment Act 1987. The mandatory garden area requirement sits in the residential zones (Clause 32). Zone schedules and overlays can add controls — neighbourhood character objectives, maximum building heights and heritage controls in particular. Always confirm the controls for your address.

Clause 55 — ResCode (two or more dwellings)

Two or more dwellings on a lot / residential building

Residential zones (Clause 32)

Mandatory garden area requirement (25–35%)

Clause 54 / Clause 58

One dwelling (54) / apartments (58)

Frequently asked questions

Do I need a permit to build two units in Victoria?

Yes. Constructing two or more dwellings on one lot in a residential zone needs a planning permit, assessed under Clause 55 (ResCode). There's no exempt pathway for a second dwelling other than the under-60 m² small second dwelling (granny flat).

What is the garden area requirement?

A mandatory minimum percentage of the lot that must be kept as garden (open, uncovered space) on lots over 400 m². It's 25% for lots 400–500 m², 30% for 500–650 m², and 35% above 650 m². A permit can't be granted if it isn't met — it's often the deciding factor for a dual occupancy.

How big does my block need to be for two units?

There's no fixed minimum, but the garden area requirement, site coverage and private open space standards mean most successful dual occupancies are on lots of roughly 500 m² and up. Smaller lots can work in the General or Residential Growth zones with good design.

What's the difference between Clause 54 and Clause 55?

Clause 54 assesses a single new dwelling on a lot; Clause 55 assesses two or more dwellings (or a residential building) up to four storeys. Apartment developments are assessed under Clause 58.

Can I subdivide after building two units?

Yes — that's the standard approach. Build two dwellings under a Clause 55 permit, then apply to subdivide so each dwelling sits on its own title. They're separate permits, usually sought together.

$39 planning report — ready when you are

A plain-English read on exactly what your property allows — zone, overlays and the rules that decide your project.