Book a FREE Site Assessment with the Leading Builder of Granny Flats and Home Extensions Since 1994

Cubitt's have been building homes across NSW and ACT since 1994. We are experienced, reliable and understand every step of your build process is part of an experience building trust to help your family create the space to grow, and to live.

You can talk to us about building Granny Flats for family, for care, or for investment. We build major House Extensions, specialising in large ground floor extensions over 40m2 and second storey extensions.

We are new home specialists, and can build you an energy efficient primary dwelling or knock down rebuild - see our Custom Cottages.

Our in-house construction teams build from Mid-coast down to Eurobodalla in NSW, and as far west as the Blue Mountains. We build all over ACT. For Regional NSW we offer in-house expertise for architectural design and council approval - we get the hard part done for you.

Explore exciting possibilities with a free site visit from one of our experienced Consultants. We’ll work within your budget to bring the most value to your project.


Download Our Granny Flat Design Collection Brochure

NEW DESIGNS LAUNCHED OCTOBER! View the 10 NEW Energy Efficient NSW Designs, each with 4 or 5 façade options. Download the ACT Designs, each meeting the Liveable and Adaptable Housing Standard requirements


Introducing 10 Brand New Granny Flat Designs Each With 5 Stunning Facades

Each designed to meet new BASIX requirements as at 1st October 2023.

Downsize in your own backyard.

Eddie wanted to build a place for his daughter who had just finished her studies at university. He and his wife were worried about how difficult and expensive it was for young people to get a place to live these days. Observing that they had plenty of space in the backyard they decided to build a Granny Flat. They plan to live in the Granny Flat later on when their daughter has bought her own place.

They see multiple benefits of living in the Granny Flat later in life including having a 'home base' while they travel, and also being able to rent out the main home and supplment their retirement income.

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Now serving regional NSW with Granny Flat Design and Development. 

Costs featured in this package are approximate and based on a 600m2 property in Penrith.
This Package includes one set of proposed plans and one revision.



Building a Granny Flat:
Where to Begin
2023 Edition

Where to Begin Granny Flats 2023 Guide


Flexible Granny Flats

Whether you want a great source of rental income or want to keep your family close, we’ve got a Granny Flat design to suit you.

Your vision is our priority and whatever goals you have for your new granny flat we’ll help you design and build a smart, modern Granny Flat that ticks all the boxes. We’re here to collaborate with you and your dedicated consultant will guide you through every stage from feasibility study to design, building and completion.

As experienced Granny Flat builders, you can expect quality service, exceptional workmanship and award-winning Granny Flat design when you choose to work with Cubitt’s.


How Do We Do It?

The best Granny Flat floor plans to suit your lifestyle

  • Full turn-key service means your Granny Flat will be tenant-ready as soon as we hand over the keys
  • Clear, upfront Granny Flat prices with no hidden costs
  • Award-winning customer service
  • Easy Granny Flat approval with help from our in-house council planning and drafting team
  • Tradies you’ll love
  • Your own, dedicated Project Manager.


9 Display Granny Flats across 4 locations

Our Complete
Inclusions Guide

Complete your Granny Flat with quality inclusions in every room. Here you get to select the finer details, colour scheme, fixtures and fittings that will bring your Granny Flat to life and make it uniquely yours. Cubitt’s offers two Inclusions Ranges for our clients to choose from, with an additional option to upgrade certain items.



Home Extensions

Our high-quality Home Extensions and renovations not only provide more space for living but also increase the value of your property. Whether you want to make your current home your forever home or want to add value to your property for when it comes time to sell, we can enhance your lifestyle and boost the value of your home with a clever custom home extension.

Love your home but need a refresh?

Stay living where you love with room to grow.

  • Stay in the family home you know and love, where your most treasured memories were made
  • Avoid the hassle, disruption and cost of moving
  • Gain the added space you need and
  • Grow the value of your existing property
  • With our own Tradie team, we’re ready to build when you are.

You may find yourself needing more and more usable space or just space for leisure and privacy as your family grows.

Whether you need a second storey addition or want to expand your single-storey floor plan, our in-house design and planning team will create a harmonious and affordable home extension solution to suit your needs.

Granny Flat and Home Extension projects delivered on time and on budget, with no hidden fees.

Our experienced Home Extension and Granny Flat builders will make the entire consultation, design and building process smooth and stress-free. We’re here to guide you through every stage of your exciting new project and will ensure you get the keys to your new Granny Flat or extension right on time and on budget.



Visit Our Display Centres

Cubitt's Display Centre
and Head Office

152 Russell Street,
Emu Plains NSW 2750

Opening Hours:
Monday - Saturday 9am-5pm

Cubitt's Display Centre

124-126 Maitland Road,
Mayfield NSW 2304

Opening Hours:
Tuesday - Saturday: 9am-4pm

Cubitt's Display Centre

80-82 Kembla Street,
Fyshwick ACT 2609

Opening Hours:
Monday - Friday: 9am-4pm

Cubitt's Display Centre

244 Shellharbour Road,
Barrack Heights NSW 2528

Opening Hours:
Tuesday - Saturday 9am-4pm

No Need to Compromise On Style

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Keeping the
Grandparents Close

Hear from Heidi from Mittagong in the Southern Highlands. For Heidi’s family, it was all about a beautiful Granny Flat which kept her parents close by, whilst harmonising with the gardens and her existing home

View Completed Projects

With over 28 years of experience, and 4,500 + new builds and extensions completed since 1994


Frequently Asked Questions

Free On-Site Assessment at Your Property

Interested in finding out how to make a positive investment from a Cubitt's Granny Flat or Home Extension? Get in touch for a no-obligation site inspection today.

If you are looking to purchase a new property and want to do a Granny Flat Suitability Check - please use this form instead.

We require your name, email and phone number to get back to you - and the more you can tell us about your build project, the more effectively our local teams can help.


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