How Much Land do you Need to Build 3 Townhouses?

When embarking on a 3 townhouse development project, it is important to understand the land requirements. Generally a suitable land size will be between 600 and 900 square metres. This allows room for living areas, private outdoor space, car parking and setbacks (the minimum distance the building must maintain from the property’s boundary, street or other structures). Under certain circumstances the minimum land size can be as small as 500 square metres. However, smaller block suitability is rare and requires highly specific requirements such as high density zoning on a corner site.

While these are average estimates, it is important to understand that there is no fixed, one-size-fits-all land size requirement for 3 townhouses as development feasibility depends on the block of land itself, zoning regulations, council planning controls, site dimensions and the size of each proposed townhouse. Nevertheless, practical minimums exist driven by the need to make sure townhouses developments are comfortable, safe and functional for residents.

* Please note the figures and specifications described in this article are general, and do not take into account many variables that influence a build.

What is the Average Amount of Land Required for 3 Townhouses?

Approximate land size estimates for developing 3 townhouses can fall into three categories – the optimal land size, minimum site dimensions, and building to land proportion. These guidelines are a benchmark for providing a practical framework for understanding typical development expectations. Requirements may need further refining to meet local zoning, design and council regulations in the area you are building. While the amount of land required for your development is primarily conditional to the local council area, this can, on occasion, be overturned by state or federal government.

General Calculation for Land Requirements for 3 Townhouses

There is a simple calculation many builders use for land requirements. It gives a broad estimate that can be a starting point for understanding land size and what is required for a structure. Two hypothetical situations for general calculations are:

If you already have a block of land and are trying to work out if it will accommodate 3 townhouses:

Divide the area of land by the total area of the structure. If the land area is 800 square metres and there are 3 townhouses with a total ground-level area of 240 square metres, then this equals 800/240 which is a ratio of 3.3:1. This is a good land to building ratio, as it fits within the parameters of the ideal sized block, as the land is 3.3 times the size of the combined ground floor area.

If you’re wanting to build a certain size of townhouse and want to understand the land requirements:

For those wanting to build high end, larger townhouses with a more spacious ground floor footprint, the same general calculation will apply. If each townhouse has a total ground floor area of 100 square metres, the overall size of the building structures is 300 square metres. The land to building ratio should be between 2.5:1 to 3.5:1 so the minimum block size for this size townhouse development is 750 square metres with the average ideal size as 1050 square metres.

Other Factors Influencing Land Size for 3 Townhouses

Land size calculation is only one metric to estimate the right sized block for 3 townhouses. There are other variables that need to be taken into account. Two plots of land can be very different and sometimes calculating the building to land proportion is not applicable. Other factors that influence the land size required for 3 townhouses include:

• Zoning laws: The zoning laws directly affect the amount of land required for 3 townhouses. These laws impose mandatory density and open space standards. The zoning laws are impacted by three main factors – mandatory garden area requirements, zoning type and density, and Rescode.
  • Mandatory garden area requirements: This mandatory requirement specifies the minimum garden area allowed on a residential block. In Victoria, the bigger the lot, the larger the garden area must be. An allotment above 650 square metres must have a minimum 35% garden area.
  • Zoning type and density: This determines the number of structures allowed per square metre of land. The General Residential Zone is typically the most suitable for a 3 townhouse development.
  • Rescode: The Townhouse and Low Rise Code changed in March, 2025 to make it easier to fit 3 townhouses on a block of land. It reduced front setbacks from 9 metres to 6 metres, increased site coverage limits and reduced private open space.
• Council specific rules: Every council in Victoria has its own rules and regulations. Some councils specify a minimum land size per dwelling as 300 to 500 square metres per lot. Others assess it based on the merit of the design. Council will look at neighbourhood character and whether the design complements the surrounding buildings. Architectural quality and sustainability will also be assessed to decide on land size requirements.
• Site configuration and access: The physical shape and layout of the block dictates how much usable space there is for townhouses. A corner block is the ideal configuration for a 3 townhouse development as these blocks often provide dual access from two different streets and usually won’t require a shared driveway for all 3 townhouses. With this type of block, the size of the land can be smaller as there is a saving of about 150 square metres of land that would otherwise be lost to a shared driveway. If the block is irregular in shape, it will limit the amount of land that can be utilised for building. Irregular blocks are notorious for being difficult to build on and even more challenging for a multi townhouse development. If you have an irregular allotment, you will most likely require a larger land to building ratio.
• Floor space ratio: This is a planning tool that represents the relationship between the total gross floor area of all the buildings and the total area of the land. It is not just the amount of area the ground floor building covers but the total square metreage of all levels combined. In a 3 townhouse development, this directly impacts the minimum sized site required. Local councils determine the permissible FSR and it can vary between different areas. In standard residential areas, the FSR can range between 0.5:1 and 1.0:1. A 600 square metre block with an FSR of 0.5:1 could have a maximum floor area of 300 square metres. A 1.0:1. FSR allows for a floor area equal to the total area of the land site.
• Townhouse design and size: The design and size of a townhouse has a significant influence on the amount of land required. When taking into consideration the land to building ratio, a larger square townhouse development will need more land than one on the smaller side. When considering townhouse design and size you also need to include the number of bedrooms required, outdoor areas and garages in the overall footprint. The average townhouse in Australia has a ground floor area of between 80 and 120 square metres, which, as a general rule will make land that measures on average 800 square metres a suitable size.
• Slope: Building on a sloping block presents a range of challenges and will impact the designs and foundations of the 3 townhouse development. A sloping block may also limit the access to outdoor spaces so you may need to invest in a larger block to accommodate for these limitations.
• Orientation: Orientation refers to the direction a block faces, which influences how the structures built on it will be affected by natural elements like sunlight and weather. The site orientation will give an indication of what you can expect in terms of energy efficiency and comfort for the 3 townhouses. Generally, a north facing orientation is ideal for subdivided lots, as it is the best orientation when accounting for the sun throughout the year. This will also be a key factor in the end sale price of the individual townhouses, as people highly value north facing properties and pay accordingly. If you aim to build sustainable townhouses incorporating passive design, the block orientation will be an important factor to consider.
• Street frontage: The length of the property’s boundary that directly borders the street is the street frontage. The width of the lot facing the street is a critical factor determining the block size required for 3 townhouses even if the total square metreage is adequate. A development of 3 townhouses requires a site with a minimum street frontage of 15 to 20 metres. This accommodates driveway access and allows for two or more townhouses to have direct street frontage.
• Easements: An easement is a legal right that allows a service authority or neighbouring property access to a specific portion of land. Although the purchaser officially owns that land, an easement places restrictions on what can be built there. Residential land can have sewer, drainage and stormwater easements, as well as power, utility and access easements. An easement does not reduce the official land size but it does reduce the usable land which determines if 3 townhouses can be built successfully.

No Two Pieces of Land are the Same

Although blocks may be listed as the same size, it is important to note that no two pieces of land are identical. Differences in shape, slope and orientation can have a dramatic impact on the size of block required for a 3 townhouse development. It is not just about total square metres but the usable, buildable area that matters. Two blocks that each measure 900 square metres have enough land on paper to build 3 townhouses. However the layout of each block will determine the feasibility. For example:

Block A

A rectangular and flat with wide street frontage and no major easements. On this property, 3 townhouses can be positioned side by side or in a front and back layout with enough room for a driveway, parking, private open space and council setbacks.

Block B

An irregular shaped, sloping parcel of land with narrow frontage. This block requires retaining walls for the moderate slope and a drainage easement running along the boundary. Extra space is required for accessways and engineering works, allowing room for only 2 townhouses on the site even though it is the same size.

Why Build 3 Townhouses?

Developers and investors often decide to build 3 townhouses as it provides a good balance between profitability and planning approval feasibility. Townhouse living caters to a range of buyers and this size development fills the gap between apartment living and expensive detached homes. This type of development maximises land value while meeting the housing demand in established suburbs. A 3 townhouse project is generally considered lower risk than large apartment developments. Additionally, in Victoria, many suburban blocks can potentially accommodate 3 dwellings when planning requirements are satisfied.

Determining the land size required for a 3 townhouse development depends on how the site is configured, mandatory green space, zoning regulations and even orientation. While there is no single statutory minimum, a site typically requires 600 to 800 square metres for a townhouse development of this size. This larger footprint is necessary to accommodate the building to land proportion with allowance for outdoor space and driveways. Successful developments usually have corner block access, wide street frontage and are rectangular in shape. While there are some basic calculations to identify how much land is required, each lot is different and it is important to investigate in detail the sized block you may need. To have your land assessed for 3 townhome feasibility, contact the experts at Forme Homes today.