Cost Control

Building Approval & Sub Division Tips for Duplexes in the Hills Shire

Dev Kunasagaram
11 Jan 2024
5 min read

Navigating Dual Occupancy & Sub Division Regulations

In the dynamic real estate market, duplexes or dual occupancy buildings have emerged as a lucrative option, addressing housing demands while offering increased profits. However, building and subdividing a duplex in areas like the Hills Shire requires adhering to crucial regulations and a strategic approach. This guide explores essential tips for navigating the sub division and council building approval process seamlessly.

1. Understanding Dual Occupancies and Subdivisions

A duplex presents a unique residential option consisting of two separate dwellings, either attached (sharing a common wall) or detached. The key benefit of subdividing a duplex lies in maximizing profits by allowing separate ownership for each home or dual income streams.

2. Land Requirements and Zoning Considerations

The Low-Rise Housing Diversity Code (LRHDC) by the NSW Government has simplified the approval process for dual occupancies through the fast-tracked Complying Development pathway. The LRHDC applies to properties zoned R1, R2, R3, and RU5 across NSW, where this type of housing is permitted under a council's Local Environmental Plan (LEP).

However, meeting specific criteria is crucial. Blocks must adhere to minimum size requirements (400 sqm), have adequate frontage (12m to 15m) to public roads, and comply with height restrictions, setback regulations, parking provisions, and minimum dwelling width requirements. Additionally, each duplex must provide one off-street parking space and be a minimum of five meters wide.

3. Navigating Council-Specific Requirements

While the LRHDC provides guidelines, individual councils like The Hills Shire Council have their own LEPs that may impose additional conditions beyond the state codes. Zoning plays a significant role, with requirements varying across zones (R1, R2, R3, etc.).

For instance, in The Hills Shire:

• Attached duplexes in R2 and R3 zones require a minimum lot size of 600 sqm, increasing to 2,000 sqm in C4 zones.

• Detached duplexes require 700 sqm in both R2 and R3 zones.

To further complicate matters, new growth areas like Box Hill and North Kellyville have their own unique LEP codes to consider.

4. Identifying Suitable Sites for Duplex Sub Division

Determining a site's suitability involves assessing various factors, including land size, slope, environmental constraints, and heritage significance. Generally, a site has good duplex subdivision potential if it:

• Complies with the minimum lot size requirements for Torrens title or Strata sub division

• Has a slope towards the street or a drainage easement if sloping towards the rear

• Is not certified as significant for biodiversity values

• Is not flood-affected.

• Has a low or minimum Bushfire Attack Level (BAL) rating

• Has no heritage significance or landslip issues

• Has no sewer line running across the land

5. The Subdivision Approval Process

Once a suitable site is identified, the subdivision approval process begins. This involves compiling a comprehensive set of documents, including:

• Architectural plans

• Stormwater management strategies

• Landscape designs

• Environmental impact assessments

Depending on site-specific factors, additional reports like bushfire assessments or geotechnical studies may be required.

6. Consulting Professionals and Building Partnerships

Navigating the complexities of building and subdividing a duplex often necessitates expert guidance and strategic partnerships. Consultants like Build 360° are well-positioned to help streamline the process, from feasibility studies to engaging professionals like architects, town planners, and builders.

Keeping stakeholders aligned with your goals, budget, and timeline is crucial. Experienced consultants can guide you through council building approval requirements, subdivision regulations, and ensuring all necessary documentation is in order.

The Pathway to a Successful Duplex Sub Division

In conclusion, building and subdividing a duplex in areas like the Hills Shire requires a meticulous approach, adherence to regulations, and strategic partnerships. By understanding dual occupancy and subdivision concepts, assessing land requirements and zoning considerations, navigating council-specific guidelines, identifying suitable sites, and collaborating with professionals, you can increase your chances of a successful duplex sub division project.

Get in touch with experienced consultants today to kickstart your duplex building and sub division journey, ensuring a streamlined process from start to finish.
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Dev Kunasagaram
11 Jan 2024
5 min read

Meet Dev

As a Civil Engineer with over 30 years of experience in commercial, mega and residential construction, Dev is our lead consultant. He has a strategic understanding of local planning laws and building best practices, and works directly with each of our clients to plan and execute their home building project. Your independent guide for peace of mind!
Dev Kunasagaram
CEO and Lead Consultant

"The most expensive thing you will ever do is build a home. It's worth doing it right"
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