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Stress-Free & Simple: Our Granny Flats Designs In Sydney

Construction projects are high-stress, high-cost and offer a high chance for something to go wrong, right?

Not at Bellcast Granny Flats.

We hear the same common fears from Sydney homeowners who have bad experiences, or know of someone who’s been through the ringer trying to add value to their home or upgrade their standard of living.

At Bellcast Granny Flat we understand you’re concerned about your budget and deliverables, and provide a design and approval process that’s stress-free and simple - guaranteed.

Our process starts with an initial assessment of your project site to make sure it meets all development requirements to continue your construction project.

Every good building starts with a clever design and we have a range of floor plans and granny flat designs for you to choose from to suit your particular needs.

We encourage you to ask questions throughout the process, recommend changes and ultimately help us to customise the design of your Granny Flat to suit your exact needs. At the end of the day, it’s your flat, and you can tailor it to meet your exact preferences.

Once you’re happy with the design, we’ll handle the entire approval process on your behalf. For sites that are suitable to Complying Development then all plans should be stamped and approved within 4-6 weeks of the design being finalised.

Call us now on 1300 661 370 for superior granny flats designs in Sydney.

What granny flat designs do you offer?

1-Bedroom 2-Bedroom 3-Bedroom

Stylish, affordable and perfect for small blocks. Our efficient 1 bedroom granny flats are fully featured and constructed with only the highest quality materials and workmanship for a perfect fit & finish.

Our range of 2 bedroom granny flats is extensive and comes fully featured. We also provide additional design services to customise your new 2 bedroom granny flat to your exact requirements and preferences.

An ingenious way to maximise available space for a low price, our 3 bedroom granny flat represents an excellent investment opportunity in Sydney’s booming housing and rental market.


What are the advantages of a granny flat?

On the fence over your own granny flat? Discover some of the proven benefits that come with investing in your unused backyard space.

✔ Granny flats are easy and quick to design, as well as being quick to construct.
✔ No need to go through the hassle of finding and buying a new plot, which has become almost prohibitively expensive in Sydney.
✔ Affordable, quick, smart, and convenient way to expand your living space.
✔ Eco-friendly, and maximising available space.
✔ Generate revenue through paying tenants

What is the granny flat approval process in Sydney?

Hate red tape and local council rules?

Perfect, if your home meets certain criteria (larger than 450m2 and with a minimum of 12m street frontage) there’s no need to secure council approval at all.

These minimum requirements are set out as per the 2009 State Environmental Planning Policy (SEPP), and make it easy to choose your preferred granny flat design and begin building your exciting new space, form of rental income, or secondary dwelling.

Of course, there are lots of things to file and you’ll still need to be compliant, but our experienced team Bellcast Granny Flats will take all of these requirements for you.

What happens if I don't qualify under the SEPP?

Don’t qualify under the criteria set out by the SEPP?

Don’t stress.

If you don’t meet the eligibility criteria, an application will need to be lodged as a complying development. You will need to complete a CDC application and this can take 20 days to get a response. If this is rejected, you will need to lodge a full application with the relevant Sydney council.

Before you do anything, it’s best to give us a call to see where you stand. We are familiar with the approval process and will be able to gauge quickly whether or not you will be able to get approval.

Reach out for free advice and support today on 1300 661 370.

What granny flat design will generate the highest rent?

If you’re looking to use your new granny flat as a way to generate rental income, you’ll naturally want to know which design is best suited to the highest rent.

While there’s no definitive granny flat design that guarantees the highest rental return, we offer a range of design options to suit your property, and help you generate positive cash flow.

1 bedroom granny flats: 3 designs to choose from
2 bedroom granny flats: 7 designs to choose from
3 bedroom granny flats: 2 designs to choose from

Sydney rental averages have hit record highs, delivering $550 per week in 2021. Imagine unlocking hundreds of dollars a week through your own personal investment property?

If that appeals to you, reach out and schedule a FREE consultation with a Bellcast Granny Flats expert to find out what your unused backyard land could be worth when transformed into a stylish and liveable new dwelling.

Can I alter my granny flat design?


We’re committed to your 100% satisfaction and endeavour to make whatever changes are practical.

However, it’s best to request these at the beginning of the design process. We can change the design after we commence work, but this may increase construction time and add additional costs. But if you have minor changes along the way, please let us know and we’ll do our best to accommodate them.

In any case, we talk you through the entire process so that everything is crystal clear right from the start.

For high-quality granny flats designs in Sydney, call us now on 1300 661 370.

Why choose Bellcast Granny Flats?

The clue is in our name.

We specialise in granny flats - and that’s it.

While most other Sydney builders spread themselves too thin trying to provide every construction service under the sun, we’d rather do one thing, and do one thing well.

As a focused granny flat building company we’re able to deliver faster builds at lower costs, and it’s pretty hard to beat a fast and quality build at such a low price. You won’t find another builder able to meet our standards of excellence or cost-effective building strategies while maintaining our quality of work.

And because we know your time is precious, we take care of all the red tape, provide you with insurance, as well as a structural build warranty.

Curious about our range of striking designs? Click here to explore our beautiful projects

Frequently Asked Questions

Can I convert my garage into a granny flat?


Although granny flats are the quick and stress-free way to improve your lifestyle and add value to your property, there are a range of factors that may prevent you from obtaining the permission to build a granny flat. These might include:

  • Zoning laws
  • Restrictions
  • Covenants
  • Legal regulations.

The main requirement for granny flat building in Sydney is that you are in a residential zone - otherwise, you will need council approval. But your granny flat dream isn’t up in smoke even with these obstacles, as there are numerous ways to circumvent (legally) most restrictions, such as converting a garage into a granny flat.

Garage conversion tends to be a little easier than building a new structure. But even building a new structure is far easier than buying or building a new house.

Do you offer project granny flats?

Yes. Our range of granny flats have been pre-designed to keep your costs down and deliver superior dwellings without the cost.

Can I make changes to the design I choose?

Yes. You can tailor your granny flat so that it looks precisely the way you want it to. We would prefer you to have the house that you like, so we’ll do everything we can to deliver your new granny flat, your way.

Are your granny flats designed to be lived in or used as rental properties?

That’s entirely up to you. Our granny flats offer style, convenience and privacy no matter who calls them home. With Sydney’s rising demand for livable spaces, your granny flat is perfect as an extension of your home, or as a standalone dwelling for tenants to enjoy.

Why Choose Us

Built To Last Guarantee: Structurally Sound For 25 Years
Built To Last Guarantee: Structurally Sound For 25 Years
Energy Efficient Design
Energy Efficient Design
Australian Made
Australian Made
No Council Approval
No Council Approval
10 Day Approval by Private Certifier
10 Day Approval by Private Certifier
Family Owned and Operated
Family Owned and Operated