Phone 0483 967 647

396 Scarborough Beach Road
Osborne Park, WA, 6017
Australia

(08) 9442 9999

We are a specialist division within the construction industry focused on Dual Occupancy homes. We offer dual key, dual living, plus multigenerational home designs for the Perth metro area.

Duplex Designs

Our Duplex range offers traditional, narrow lot and side by side and corner lot designs. A duplex development offers the benefit of two brand new homes on your block.

Duplex Designs

A Duplex design & development, allows for a single titled lot to be split into two independent titles (Lot 1 & Lot 2). There are three main types of (Land separated) duplex styles -

 
  1. Traditional “house behind a house” style duplex

  2. Side by side duplex design

  3. Corner lot duplex design

95% of the designs we create for our clients are customised specifically to the lot shape, Shire requirements and our customers expectations and budget! If your serious about building a Duplex Development, it is critical we run a true feasibility of costs and show the appropriate design options.

Visit a Duplex display Home today!

 

Traditional Duplex Designs

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If you have a standard shaped block, a traditional duplex development may be your best option! A lot of councils are now limiting the number of driveways coming off standard lot shapes and forcing our designs to have only one council crossover or not allowing side by side developments. This type of design is essentially a new house behind a new house.

Call Us for a Free Chat!

More designs below!

 
 
 

Increased Equity and Rental Income

By developing a duplex, you effectively double the dwellings on your block, increasing property equity and potential rental income. Whether you choose to live in one unit and rent the other or lease both, the financial benefits are substantial.

 

Side by Side Duplex Designs

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Side by side duplex designs are very poplar where one wants a more traditional family layout. The designs are based off narrow style designs and typically range from 8 meters to 12 meters in width. This helps the homes reach better resale, by offering their own street frontage to the main road.

Discuss your Ideas Here!

 

Architectural or Project Builder Style Options Available!

 

More Designs Below!

 

Benefits of Choosing Dual Income Plus

Customized Solutions - We understand that each property and client is unique. Our experienced consultants work closely with you to design a duplex that fits your specific needs and budget, complying with local council regulations.

Comprehensive Support - From initial feasibility studies and site assessments to managing construction and final handover, our team provides end-to-end support, ensuring a smooth, hassle-free experience.

High-Quality Construction - We use premium materials and construction techniques to ensure that our duplex designs are durable and offer long-term value.


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Design Service!

Need inspiration. Our in-house Designer offers a complete concept sketch ready for quotation


Corner Block Duplex Designs

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With WA State R-Code amendments and recent council policy changes, most corner lots through out the Perth Metro area are now eligible to build two homes. Unfortunately, Corner Lot Duplex Designs cannot be built from standard residential style plans. These designs are shaped to meet specific strata and council policy. 99% of the time, they will be customised to your block.

Call for an Obligation Free Chat !

 

The Duplex Development Process

Step 1: Consultation and Feasibility Study

We begin with a free, no-obligation consultation to understand your goals and assess your property's potential. A detailed feasibility study evaluates the viability of a duplex development and provides accurate cost estimates.

Step 2: Design and Approval

Our design team creates a tailored duplex design that meets your requirements and complies with local council regulations. We handle all aspects of the approval process.

Step 3: Construction and Management

Our experienced construction team manages the entire building process, ensuring that your duplex is constructed to the highest standards. We keep you informed at every stage.

Step 4: Final Handover and Ongoing Support

Upon completion, we conduct a thorough inspection and handover your new duplex. We provide ongoing support to ensure your investment continues to perform well.

 
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Tossing and Turning what to do!

Call Us for an Obligation Free Project Feasibility !


Can’t Find The Right Plan!

Over 3,000 plans available!


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Duplex FAQ

(Duplex Designs and Development Questions)

Duplex FAQ
How much does a duplex cost to build?
As a general guide, the lower end of a duplex development can start at $800,000. Typical costs in the Perth metropolitan area range from $750,000 (basic) to $1,100,000 (premium) for a single-storey duplex development. Double-storey typically starts at around $970,000+. We offer a comprehensive feasibility study to break down all incremental costs, which you can share with your accountant or finance broker. Plus, we have dozens of case studies we can run through!
How long will the whole process take?
Including the initial feasibility study and design consultation, council submissions, colour selections, and physical construction, we recommend allowing 18 to 24 months for a single-storey duplex development. For double-storey duplex developments, inclusive of initial feasibility studies and design consultations, we suggest planning for around 18 months. Please note that every planning application varies based on the number of concessions requested.
What are the hidden costs involved?
Building any new home involves thousands of items that need to be checked and cross-checked. Our free feasibility study is designed to address all grey costs. We are 99% confident in the information we deliver to our clients. Call us for an obligation-free feasibility assessment of your block!
What should I know about strata and creating titles?
Survey Strata: This involves applying to the Western Australian Planning Commission to create two independent titles with boundaries around the external perimeter fence. This process takes approximately 7 to 12 months. Lenders often prefer to see the two titles before releasing construction funds. Built Strata: This application can be completed via the builder's planning application, reducing time frames to under 3 months. Title creation can be completed during physical construction. Built Strata is often preferred for its faster and simpler process. Once we evaluate your block, we can provide accurate advice on the best option and time frames.
Can I come in for a chat, so I can learn more first?
Absolutely! We offer obligation-free phone feasibility assessments and in-person meetings to discuss your ideas. We guarantee that if you don’t leave better informed about your duplex development, you can bill us for your time.
I have some ideas—can we discuss them further?
Call us to organise a meeting! Our office is based in Osborne Park, or we can visit your home to discuss your ideas.
How can you prove you’re the right team for my project?
Dual Income Plus is an independent design and building consultancy. We work with top builders and designers, evaluating your expectations, budget, and ideas to recommend the best options. This ensures a tailored solution compared to walking into a builder's office with no clear goals. Our expertise guarantees you the best design and delivery outcomes.
Do you offer copyright-free plans?
Yes! We work with over 25 professional Perth designers specialising in duplex plans. Independent designers allow you to obtain a license to use the plan once and shop it around. We ensure designs fit council and block parameters while staying within your budget.
How do I know I’m getting the best price?
We compare quotes, specifications, and construction quality from dozens of top Perth builders daily. This independent process typically saves clients between $5,000 and $80,000. We have real-life case studies to prove it!
Duplex Block Buying Advice
  • Corner Block: Be aware of potential access constraints near main intersections, such as traffic lights or non-mountable traffic islands, which may limit driveway positioning.
  • Sewer Pipe Location: Check for underground sewer pipes (easements), as they are no-build zones that may impact your duplex plans.
  • Zoning: Confirm the number of dwellings allowed per square meter by consulting your local council's mapping system.
  • Old Swimming Pools and Septic Systems: Swimming pools should have the top 600mm edge removed and filled with clean building sand. Septic systems need partial removal, with proper compaction and certification to meet engineering and council standards.
 
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Free (over the phone) Project Feasibility!

Phone (7 Days) 0483 967 647