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Granny Flats in NSW

View our range of 1, 2 and 3 Bedroom Granny Flats to suit NSW Building conditions

Granny Flat Inclusions

Granny Flats in ACT

View our extensive range of 1, 2, and 3 Bedroom Granny Flats designed to suit building regulations in the Australian Capital Territory

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Master Builders of Granny Flats & Home Extensions

Visit a Cubitt’s Showroom - Fully Built Granny Flats on Display

Sydney | Wollongong | Newcastle | Canberra

We’re Here to Help You!

Cubitt's Granny Flats and Home Extensions is a proudly Australian, family-owned and operated business. We’ve been in business for over 28 years and during that time we’ve perfected the process of designing and building a wide range of modern granny flats and top-quality custom home extensions

Your money matters, and it matters to us. That’s why we’ll work within your budget to bring the most value to your project, whether through a highly marketable granny flat or a home extension that adds thousands in value to your home.

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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


Elderly Couple In Granny Flat Or Home Extension

“Building with Cubitt’s was like flying first class”

- Michael - Gowrie ACT

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“With Cubitt’s, everything was on a platter. They made it so easy!”

- Renae - Emu Plains NSW

Cubitts Renovation

Beautiful, Spacious Home Extensions

Love your home but need a refresh?

There are so many reasons to extend your home – growing family, aging parents or just your desire for a refresh!

Did you know Cubitt’s build Home Extensions in Newcastle and stunning Home Additions in Canberra? Take a look at our work building in Goulburn, renovating in the Central Coast and finishing stunning home improvements in the Southern Highlands – Cubitt’s build in many parts of NSW and all through the ACT.

You may find yourself needing more and more usable space or just space for leisure and privacy.

Whether it be a second story addition, or just more space to a single-story floorplan, our inhouse design and planning team will create a solution which is a harmonious and affordable home addition.

No need to change address or move schools! Stay in the family home you know and love, where your most treasured memories have been made, all while achieving the added space you need and growing the value of your existing property.

Make this home your forever home!


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“We love the house we brought our babies home to, now we love it more because we have space for them as teenagers!”

- Kim - Spring Hill NSW

About The Team

Granny flat and 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.

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Our handpicked team of design consultants can show you how your home’s potential can be fulfilled as soon as you wish.

Get in touch with Cubitt's

No Obligation, Free In-Home Consultation

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


Or call 1300 721 150



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How much do granny flats cost in NSW?

Granny flats in NSW can range in price from $80,000 to $200,000+. At Cubitt's, our granny flats typically cost between $120,000 and $150,000, with those prices covering a wide range of valuable inclusions such as the slab your granny flat will be built on, electrical, plumbing and a selection of furnishings and fixtures. 

Every granny flat we build comes with a transparent upfront quote so you know exactly what you’re paying before you sign any contracts. With no hidden fees and unexpected costs, you know when you build with Cubitt’s you’re getting the right price and great value for money. Plus, your granny flat comes with a seven-year warranty and home owners warranty insurance from the moment you sign on with Cubitt’s. 

Browse our range of granny flat designs or talk to one of our consultants about an affordable custom granny flat design. Our design team will gladly work with you to come up with a granny flat that meets all your requirements and works within your budget. 

Will an extension add value to my home?

Yes. A good quality extension will add value to your home. It’s crucial to have your home extension planned and built by an experienced home extensions builder to ensure you don’t overcapitalise and get the greatest value from your addition or extension. 

Our experienced consultants can work with you to come up with a custom home extension that enhances your lifestyle and adds value to your home, all while working within your budget. 

Why should I build with Cubitt’s?

Whether you’re adding a modern granny flat to your home to use as an added income stream or need an extension to accommodate your growing family, we’ve got you covered. With almost 30 years of experience building value-adding extensions and granny flats, we know how to deliver the best possible results for you on time and on budget. 

  • 28+ years in business. We’ve been designing and building stunning modern granny flats and value-adding home extensions since 1994 and have developed a streamlined process that gets your project completed on time and on budget.

  • Australian family-owned and operated. We’re proud to be a family-run business and we’re dedicated to providing exceptional personalised service to each of our clients.

  • Local expertise. With showrooms throughout NSW and the ACT, we have the local knowledge and network of tradespeople and suppliers needed to get the job done right.
  • In-house design team. Want a custom granny flat? Dreaming of a totally unique home extension? Our experienced design team can make your vision a reality.
  • All council approvals. Don’t put off your building project because of the paperwork – we’re here to handle it all for you! 

How long does it take to build a granny flat?

Building a granny flat with Cubitt’s usually takes around 12 weeks, however, you will also need to allow time for council approval, site visits and feasibility studies too. If possible, our council and drafting team will obtain a Complying Development Certificate (CDC), for your granny flat to help your project get started as quickly as possible. Your consultant will provide you with an accurate timeframe for completion of your granny flat and keep you updated on any changes with regular progress reports. 

Do I need council permission to build a granny flat in NSW?

Yes, you’ll either need to gain Council approval or obtain a CDC (Complying Development Certificate) before you can build your granny flat. Fortunately, not having to deal with your local council is all part of the service when you build with Cubitt’s! Our in-house council planning and drafting teams will sort out all your certifications and approvals on your behalf. We’ve dealt with councils throughout New South Wales and the Australian Capital Territory and can take care of your approvals wherever you are and get your project on the road as soon as possible. 

How much do you charge for home extensions?

Our speciality is major renovations, additions and home extensions. Due to the nature of these extensions we typically only work on projects costing $150,000 or more. Each of our extensions is unique and the cost of your project will depend on the work that’s being done, your location, the complexity of the project and a number of other factors. Our in-house quoting team will prepare a detailed upfront quote for you so you’ll know exactly how much your extension will cost with no hidden fees or costs. 

The important thing to remember when planning your home extension is the value that it will add to your home. Our home extensions can add tens or even hundreds of thousands of dollars worth of value to your home, making them an investment in your future as well as an investment in your family’s comfort and space. 

Our experienced consultants will work with you to create an extension that adds value to your home and works within your budget. Call us on 1300 721 150 to learn more. 

I thought granny flats had to be 60m², how is it that Cubitt’s designs are bigger?

The space limit of 60m² (or 90m²  in the ACT) for granny flats only applies to the interior space. This means that any external areas like decks, garages, alfresco dining spaces and verandahs can be included in your granny flat design without encroaching on that 60m² limit. Our modern granny flat designs are spacious, comfortable and airy and will make you feel right at home. We’re also pleased to offer custom granny flat designs at no extra cost, so if you’ve got something particular in mind, we can make it happen.

What is a turnkey granny flat?

“Turnkey” is a term that means a property is ready to move into. Our turnkey granny flats are always resident-ready as soon as we hand the keys over with a range of standard inclusions such as plumbing and electrical, energy-efficient hot water systems, rainwater tanks, wardrobes, fencing, outlets, window blinds, an oven and cooktop and lots more. Whether you’re planning on moving your elderly parents into your new granny flat, want to rent it out as an Airbnb or lease it to long term tenants, you’ll be ready to go the moment we complete your project.