One Block.
Two Homes.
Twice the Potential.

NSW planning changes have opened dual occupancy to more residential blocks than ever, and federal tax settings now favour projects that add new housing. Find out what your block could support with a free feasibility session.

Check My Block

Call 02 9634 3600

3000+

Homes Designed

40 years

of Experience

Dual Occupancy

Specialist

One Block. Two Homes.
Twice the Potential.

Check My Block

Call 02 9634 3600

3000+
Homes Designed

40 years
of Experience

Dual Occupancy
Specialist

The 2026 Rules Changed the Maths on Rebuilding

Two significant changes have reshaped the thinking around knockdown rebuild blocks.

First, the 2026 Federal Budget introduced reforms that limit negative gearing for residential property to new builds from 1 July 2027. The government’s published examples describe a duplex replacing a single house as a project that adds to housing supply, while a like-for-like single home rebuild is treated differently.

Second, recent NSW planning reforms have made dual occupancy permissible on many residential blocks where it previously was not. Many owners are yet to discover what their land could now support.

Together, these changes mean the conversation on a rebuild block has shifted from “what house can I build?” to “what could this site support?” For some owners, a well-designed two-dwelling project may offer more flexibility than a single replacement home.

The 2026 Rules Changed the Maths on Rebuilding

Two significant changes have reshaped the thinking around knockdown rebuild blocks.

First, the 2026 Federal Budget introduced reforms that limit negative gearing for residential property to new builds from 1 July 2027. The government’s published examples describe a duplex replacing a single house as a project that adds to housing supply, while a like-for-like single home rebuild is treated differently.

Second, recent NSW planning reforms have made dual occupancy permissible on many residential blocks where it previously was not. Many owners are yet to discover what their land could now support.

Together, these changes mean the conversation on a rebuild block has shifted from “what house can I build?” to “what could this site support?” For some owners, a well-designed two-dwelling project may offer more flexibility than a single replacement home.

Let’s Look at
Your Block.

A free 30-minute session on your block: zoning, dual occupancy potential, and the right approval pathway, CDC or DA. Straight answers before you commit to anything.

Proven Results.
Trusted by Homeowners Across Sydney

Real Homes. Real Stories.

    
 
 
       Posted on Google  
   
   Hesh Rasitha 
 
 
 
 Trustindex verifies that the original source of the review is Google. Having dealt with a number of architects in the past we found Fyffe Design to be a cut above the rest. My wife and I had a brilliant experience with Henry and Finnlay who really took the time to understand our needs and come up with an amazing home design. They were timely, professional, responsive and full of great ideas - it truly was a bespoke service. We recommend anyone looking to design their dream home or next project to contact the team at Fyffe.
  
 
      Posted on Google  
   
   Shashank Kharche 
 
 
 
 Trustindex verifies that the original source of the review is Google. We had the pleasure of working with Fyffe team on our home project, and the experience surpassed our expectations. Fyffe team demonstrated an exceptional level of creativity in transforming our ideas into a stunning reality. Their attention to detail and innovative design solutions truly set them apart. What impressed us most was their ability to communicate effectively throughout the entire process, ensuring that our vision was not only understood but enhanced. We are now living in a space that not only meets our practical needs but also brings joy and comfort every day. We wholeheartedly recommend their services to anyone looking for a talented and visionary architect who can transform ideas into breathtaking architectural masterpieces.
  
 
      Posted on Google  
   
   SUHAIB GHAZALI 
 
 
 
 Trustindex verifies that the original source of the review is Google. Fyffe Designs is indeed a highly reputable and innovative architectural firm. Their ability to create aesthetically pleasing and environmentally responsible designs while paying meticulous attention to detail is commendable. Their commitment to blending functionality and eco-friendliness in their projects is a great testament to their dedication to sustainable design. They have a great team of professionals who are reliable, easy to work with, and maintain excellent communication. This speaks to their professionalism and dedication to providing a positive client experience. Fyffe Designs is an architectural firm that consistently delivers outstanding results and exceeds expectations. I would like to say thanks to Leisa, Henry and Ebru for all their hard work and commitment.
  
 
      Posted on Google  
   
   J Chen 
 
 
 
 Trustindex verifies that the original source of the review is Google. Xu has done two French provincial homes for us. we are extremely happy with her service. I felt lucky that we found her and FYFFE. Without her in-depth understanding of CDC rules, our site could not maximize its allowable FSR.  During the design process, Xu has been very responsive and can turn the client idea into the reality . Her design ticks all the box of what the luxury houses needs. We would not hesitate in recommending her to anyone who looks to build their dream home.
  
 
      Posted on Google  
   
   Wang Maggie 
 
 
 
 Trustindex verifies that the original source of the review is Google. My designer, Xu, is highly recommendable. After our first meeting, she quickly grasped my requirements for the layout. Our communication is very smooth, and she always responds to all of my questions promptly. Her attitude is excellent, and she often provides me with very professional advice.
  
 
      Posted on Google  
   
   Justin Diamond 
 
 
 
 Trustindex verifies that the original source of the review is Google. Brief: Integrate a new modern home with an existing pool, on a triangular shaped sloping block including a sewer easement and a huge dawn redwood tree that had to stay. Plus, not having a northerly aspect meant the Team at Fyffe needed to bring the light into the living areas. It seemed like an impossible task, however, the Team at Fyffe (Brent, Henry, Craig and Leisa) went above and beyond nailing the brief while keeping me informed, involved and comfortable with the process. Their experience with council and approval processes meant I didn't have anything to worry about. If you are looking to build a new home, and you'd like to have a design before finding a builder, I highly recommend Fyffe Design, especially since they have the ability to collaborate with builders during the design process. Friendly, creative, competitive and a quick turnaround!
  
 
      Posted on Google  
   
   Scott Li 
 
 
 
 Trustindex verifies that the original source of the review is Google. The best architect service ever!
  
 
      Posted on Google  
   
   Zhipeng Zhao 
 
 
 
 Trustindex verifies that the original source of the review is Google. Very unique facade design for current projects and definitely recommend for simple French provincial style.
  
 
      Posted on Google  
   
   Ria Shah 
 
 
 
 Trustindex verifies that the original source of the review is Google. Had the best experience designing our dream home with Alex, Henry and team! Highly recommend them for your next project
  
 
      Posted on Google  
   
   Noel Hopper 
 
 
 
 Trustindex verifies that the original source of the review is Google. On behalf of David McAndrew - We were extremely pleased with the professionalism and quality of the design team at Fyffe Design. From the outset, they were collaborative, responsive and extremely attentive to our requirements. The design process went smoothly and the end result is fabulous. We would highly recommend Fyffe Design Services to all prospective clients.

One Block, Two Paths

What Could Your Block Really Support?

The same knockdown rebuild block can now go two very different ways. Here is how they compare.

A Single Replacement Home

The traditional rebuild

One home on the block, same as before
One rental income if leased
One asset, one exit
The familiar path, and for some blocks the right one

Worth Exploring

A Two-Dwelling Project

The dual occupancy pathway

A second, brand-new dwelling on the same land
Potential for two incomes from one block
Space for parents or adult kids, with their own front door
Flexibility to live in one, lease one, sell one, or hold both

Check My Block’s Duplex Potential

Free. 30 minutes. No obligation.

Tax treatment depends on your circumstances. Fyffe Design provides design and approval services only, so speak with your accountant before committing to a project.

Will My Block Work?

Every Block Is Different. Here’s What We Check.

Whether a dual occupancy is worth pursuing comes down to your specific site. That is what a free feasibility session is for.

1

Check

Zoning and
lot requirements

Recent NSW planning changes mean dual occupancies are now permissible on more residential blocks than before, but zoning, lot size, frontage and local controls all matter. We review your site against the current rules and tell you plainly what pathways are open.

2

Check

The right approval pathway: CDC or DA

Some dual occupancy projects can be assessed through Complying Development, which can be significantly faster. Others need a Development Application through council. We are experienced in both and will recommend the pathway suited to your site.

3

Check

Buildability and practical design

Our Design Manager, Brent Gasson, spent over 25 years as a licensed builder before leading design at Fyffe. The designs we produce are practical to build and realistically scoped, so there are no surprises when your builder prices the plans.

Our Dual Occupancy Portfolio

Multi-dwelling designs shaped around how people actually live, on blocks like yours.

zafariqbal.ft@gmail.com2026-09-01T07:37:25+00:00

Xanadu Modern Duplex

zafariqbal.ft@gmail.com2026-09-01T07:41:31+00:00

Xanadu French Provincial Duplex

How it works:

Simple 3-Step Design Journey

Designing your project should feel simple and stress-free. Our clear, 3-step process guides you from first ideas to builder-ready plans with expert support along the way.

Step 1: Free Feasibility Session

The session covered above: on-site or virtual, your block reviewed for zoning, dual occupancy potential and the right approval pathway.

Step 2: Tailored Design & Council Support

A dual occupancy designed around your block, your budget and your goals. We handle every detail of the DA or CDC submission, ensuring your plans meet council requirements with minimal stress.

Step 3: Builder-Ready Plans

You receive detailed, approved plans including floor plans, elevations and consultant coordination. Everything your builder needs to get started with confidence.

Book My Free Session

Got Questions? We’ve Got Answers

Could my block support a dual occupancy under the new NSW rules?zafariqbal.ft@gmail.com2026-09-01T10:24:39+00:00

Could my block support a dual occupancy under the new NSW rules?

More blocks are eligible now than before the recent NSW planning reforms, but it depends on your zoning, lot size, frontage and local controls. That is exactly what we review in your free feasibility session.

How do the 2026 federal tax changes relate to dual occupancy projects?zafariqbal.ft@gmail.com2026-09-01T10:22:21+00:00

How do the 2026 federal tax changes relate to dual occupancy projects?

The 2026 Budget reforms limit negative gearing for residential property to new builds from 1 July 2027, and the government’s published examples describe a duplex replacing a single house as adding to housing supply. How the rules apply to your project depends on your circumstances and how the project is structured, so speak with your accountant before making decisions. Our role is the design and approvals side.

CDC or DA for a dual occupancy, which is faster?zafariqbal.ft@gmail.com2026-09-01T10:20:23+00:00

CDC or DA for a dual occupancy, which is faster?

CDC (Complying Development) is generally faster where a project meets the criteria. If it does not, a DA through council is the pathway. We are experienced in both and will recommend the route suited to your block.

Can I live in one dwelling and rent or sell the other?zafariqbal.ft@gmail.com2026-09-01T10:17:06+00:00

Can I live in one dwelling and rent or sell the other?

Many of our clients design with exactly that in mind. We shape the design around your intended use, whether that is dual rentals, live-in-one, or a future subdivision, and flag the approval and title questions to raise with your surveyor and solicitor.

Do I need a builder before I start with you?zafariqbal.ft@gmail.com2026-09-01T10:12:43+00:00

Do I need a builder before I start with you?

No. Our focus is getting your design and approvals sorted first. Once your plans are ready, we can recommend trusted builders from our network, professionals we have worked with over the years who share our commitment to quality and clear communication.

How long does the design and approval process take?zafariqbal.ft@gmail.com2026-09-01T10:10:36+00:00

How long does the design and approval process take?

It varies based on your design scope and approval pathway, but projects suited to CDC can move quickly. We will give you a realistic timeline during your feasibility session.

Why choose to design with Fyffe?User12342026-09-01T10:07:50+00:00

Why choose to design with Fyffe?

With over 3,000 homes designed, Fyffe brings deep experience, council knowledge and design clarity to every project. You work one-on-one with a senior designer and receive a plan tailored to your lifestyle, block and vision, not a generic template.

Still have questions?

Feel free to contact us if you have further questions.

One Block.
Two Homes.
Twice the Potential.

One Block. Two Homes.
Twice the Potential.

The 2026 Rules Changed the Maths on Rebuilding

The 2026 Rules Changed the Maths on Rebuilding

Let’s Look at
Your Block.