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How Much Does It Cost To Build The Cheapest Granny Flat?

granny flat

Many of us think to extend our existing homes or flats. While this extension is out of the budget for many, it invites lots of work too. The addition of a simple granny flat can be helpful for you. A granny flat is a self-contained living area. It is usually located on the grounds of the existing home. It is termed as an additional dwelling unit because you can connect it to your current flat or separate it. What you can find in any modern granny flat is a living area, kitchen, and bathroom. It is ideal for one or two people. Whether you’re looking for a modern yet tiny place or want to extend your flat, granny flat never lets you down. Let us have a look at the best advantages of having a granny flat.

Advantages of having a Granny Flat

Granny flat got its name as these units are mostly used for elderly parents of the home. They get their place with full peace and can enjoy the joy of staying with their kids too. If you’re having such a requirement, granny flats are ideal for ensuring the best privacy with closeness to your family.

Secondly, during pandemic times, many professionals have switched to work from home. Granny flat at your location can be an ideal meeting point for your clients. You can work from your granny flat without disturbing your family or putting them at risk.

Thirdly, granny flats are an ideal replacement for the extension of flats. Extension invites a bundle of expenses while granny flats are built easily and require the least budgets.

Granny Flat- How Much Does It Cost?

After having a look at its advantages, if you’re interested in building a granny flat, let us help you with its cost. To build the cheapest granny flats, it is essential that you must consider the following details:

  • Size of the granny flat: You have to decide on the space requirements of your granny flat. It starts from 36 meters square and goes up to the client’s requirements and budget.
  • Purpose of the granny flat: The purpose of the granny flat helps in its attached or separate construction from the existing flat.
  • Types of granny flat: You can choose a single storey or double storey granny flat based on your needs.
  • Other requirements in the granny flat: The helpful services like easy exits, ramps, etc for the elderly invite additional costs.

Cost of the cheapest granny flat

The cost of the minimum one-bedroom size granny flat starts from 80,000 Australian dollars, and the same for two bedrooms starts from 110,000 Australian dollars. It depends entirely on the size, number of bedrooms, additional services in the granny flat, and the number of storeys.


Granny flats are not only for grannies but a modern piece of infrastructure at your place. You can enjoy the best of the granny flat by building it at minimalist cost and maximum comfort. It is possible to make it in your desired budget and style if you consider all cost factors and plan accordingly.

Garage Granny Flat, Is it possible to build it?

granny flat

Have you heard people discuss the benefits of their granny flat? Many people across the continent are already in love with these compact and robust units of your house. You may connect your granny’s flat or keep it independent according to your requirements. The advancement in infrastructure technology has given us many types of granny flats. You must have heard about one-bedroom granny flat, two-bedrooms granny flat. Next in the line are the single-storey and double-storeys granny flats. But have you ever seen a garage granny flat?

What is a Garage Granny Flat?

A granny flat that is built above the garage is named the garage granny flat. Hence, it uses the best of another self-sufficient space in your house. Your garage serves the best for your vehicles and as an alternative entry to your place. What about connecting it with your granny flat? However, this construction at your home must meet the guidelines of the concerned authority. The roof of the garage is used as the base for your granny flat. Sounds fantastic. The million-dollar question that arises here is that is it possible to build it?

Garage Granny Flat- Is it possible to build?

You will be more than happy to know that building a granny flat over your garage is possible. All you need to do is go for the best possible arrangement that suits your needs and matches the construction standards. Further, you may take care of the following essential points:

  • Addition of foundation to the granny flat: Your garage is a space. Hence, it requires assistance in supporting the granny flat builders. This assistance is best provided by the additional steel beams or timber beams and hulk concrete slabs. This combination works the best for ensuring that your granny flat withstands the structural constraints without getting damaged.
  • Planning of the granny flat: Any granny flat above the garage can adjust a minimum of two-bedrooms, veranda, bathrooms, kitchen, laundry, living area spaces, etc. You can get this done from any experienced granny flat architect. Don’t forget to see his sample granny flats.
  • Plumbing connections of the granny flat: Along with the design, it is mandatory to plan the plumbing connections to your garage granny flat. You have to make a note of the water connections and wastewater drainages and plan accordingly.
  • Insulation of the flooring: Your garage is one of the most noise-making spaces in your house, except your kids’ room. Hence, anything above it requires full sound protection. Therefore, you can go for the insulation of the flowing of your granny’s flat.

Garage Granny Flat- Conclusion

If you’re high on spirits to make a granny flat but low on lands, go for the garage granny flat. This type of granny flat further eliminates blocked sunlight and ventilation to the main property built on an existing garage only with help of granny flat builder. Is garage granny flat feasible? Yes, it is 100% possible to make a garage granny flat.

What Are the Requirements To Get A Granny Flat Approval?

granny flat

Owning a granny’s flat can be the best experience of your life. It is a compact yet highly functional unit of your flat that has independent and related advantages. It can help you increase your income by rent, can accommodate your aging parents, or can give you the option of a private location inside your home only. That is why more and more people are attracted to granny flats.

Granny Flat Approval

But after all, a granny flat is a property only. Thus, building a granny flat Sydney requires approval from the concerned planning authority. You can get this approval quickly. Before jumping to the list of requirements, it is vital to note some basics. Firstly, your granny flat should be built according to the compliances only. Further, it can be connected or not connected to the existing property on the same land.

Requirements to Get a Granny Flat Approval

In the year 2009, the NSW government issued the Affordable Housing State Environment Planning Policy (SEPP). Thus if you’ve a granny flat in your residential property, it must adhere to the following guidelines. These are the crucial steps in the approval process:

  • Size of the property: The size of your property should not be less than 450 meters square. In case it is less than this, you need to consult the approval expert.
  • Maximum floor space: The top floor space should be between 330 meters square in blocks ranging between 450-600 meters square. It should be 380 meters square in case of blocks ranging between 600-900 meters square. It should be 430 meters square in case of the block is greater than 900 meters square.
  • Height and width of the property: The height should be 3.8-meter maximum and, the width of the property should be greater than 12 meters.
  • Setback distances: The rear setback of minimum 3 meters in case of property greater than 900 meters square or 5 meters if it is more significant. The front setback should be at the average distance of the two nearby units. The granny flats Sydney setback a minimum of 1.8 meters. The side setback of a minimum of 0.9 meters in property greater than 900 meters square or 1.5 meters is more significant.
  • Stormwater Drainage: It must have downpipes to the existing drainage system/ an on-site stormwater disposal system or inter-allotment drainage.
  • Excavation: It should not exceed the excavation limits of 1 meter if located within 1 meter of the boundary, 2 meters if located between 1-1.5 meters of the border, and 3 meters if situated at more than 1.5 meters of the edge.
  • Landscaped Area: It should have a minimum of 25% of landscaping.
  • Tree Trunk Distance: It should have a minimum distance of 3 meters from the nearest tree trunk.
  • Principle Private Open Space: It must have an entertainment area of a minimum of 24-meter squares and accessible from the living room

How to Create Comfort in Your Granny Flat

Granny flats are designed with the goal of creating a more convenient and safer space for loved ones or tenants who are aging or ailing. Comfort is also an important part of the design element. The living space has to feel cozy and loungy. Following an open space living theme with less of clutter can be the right approach to the design. It will be best to focus on including all the essentials rather than cramming lots of things into it.

It is recommended to follow these tips when discussing comfort with your Granny flat builder:

1. Illuminate the Living Space

These accessory dwelling units are usually limited to a floor area of 60 sq.m. in most states and territories. Illuminating the space can make it seem larger. Adding highlight windows and raked ceiling can bring all the light required to brighten up space and create an illusion of more space.

2. Store Up to the Ceiling Height

The limited space can soon get filled up and feel cramped if you don’t plan it smartly. A smart way to create more storage space is to have your granny flat builders build cupboards and shelves that go up to the ceiling height. With enough room for keeping all the stuff tucked away, there will be less clutter to interfere with your comfortable space.

3. Create a Study Nook

Creating an office inside your granny flat can be a complicated and expensive task. Designing a study nook will not be. It requires a little amount of empty space. Your builder should be able to design a desk into the available wall space. It is a small but cozy place for spending study hours.

4. Create an Island Bench or Breakfast Bar

The more functionality you can add to the unit, the greater will be the comfort. Adding island benches and breakfast bars can help you get more out of the space. Your builder can make the right recommendations on what can be best for your kitchen space. Besides increasing storage space, breakfast bars can also work as alternative areas for enjoying food.

5. Add a Garden

Gardens are not just about making your granny flat look beautiful. They can also add an important element of comfort. Adding something as basic as a gutter to add plants or trenches for growing hedges can make a huge difference. This helps create an outdoor space for the occupants to spend a relaxing time. Comfort is also about how things look.

6. Add a Patio or Deck

There are many ways you can bring the outdoors in to create a more comfy granny flat.

  • Adding a timber deck or patio is an excellent way to create a seamless indoor and outdoor living experience
  • Install bi-fold doors that create a sense of larger space
  • Adding a kitchen servery window connected to the outside can also add convenience and comfort

There are many more things you can do to create a comfortable and convenient space. it is recommended to find the right granny flat builders to help you come up with smart ideas.

How Much Does It Cost to Build A Granny Flat in Sydney?

Are you planning to build a Granny flat in Sydney? These accessory dwelling units are a popular investment option for enhancing property value and generating rental income. It is also built to create private resistance for an old or ailing loved one. You should certainly want to know how much these units cost to build before you even before you contemplate meeting a building or designer.

Granny Flat Prices

Granny flats Sydney are built in different styles and materials and the cost can vary based on your choices. The cost of custom build units will be different from that for kits and flat-pack flats.

You should expect the cost to range from $50,000 to well over $120,000. The factors that influence the final cost will include:

  • Size and floor area
  • Types of materials and finishes
  • Condition of your land

Even council fees can affect the cost. Plumbing and electrical expenses can also influence the cost. The distance from your property can also make a difference. If you seek to rent the unit, you will also have to add privacy features such as fences.

Granny Flat Cost by Bedrooms

The number of bedrooms in the building will have a huge impact on the cost:

  • Single Bedroom Units: If you have limited space, a single-bedroom accessory dwelling unit may be perfect. Such a unit can measure anything from 35 sq.m. to 45 sq.m. and can cost up to $100,000.
  • Double-Bedroom Units: These units can provide convenience to grandparents or visiting guests. The typical size is 60 sq.m. and you can expect the costs to be up to $130,000.
  • Three-Bedroom Units: If you have adequate space in your property and the need for a 3-bedroom Granny flat Sydney, you should expect to spend at least $150,000.

Granny Flat Kit Homes

Granny flat kit homes are less expensive compared to building the units from the ground up. The cost of a slab, electrical, and plumbing fixtures may be included within the quote. Look for kit home builders that offer a certain distance of plumbing and electricity and charge for additional distance. Compared to construction projects, kit granny flats can cost the following:

  • Up to $120,000 for units of 71 sq.m.
  • $95,000 for units of 50 sq.m.
  • $81,000 for units of 38 sq.m.

Different kit builders will offer different quotes. It is important to compare the quotes carefully, as some may include or exclude some or all of these factors:

  • An external power point and multiple power points
  • Carpeted bedroom
  • Flooring for other rooms
  • Full kitchen
  • Enclosed shower with complete bathroom fittings
  • Energy-efficient electrical fixtures

You may opt for other options than standard cladding, thus affecting the price.

If you want to have a custom-designed unit, it is important to get quotes from multiple builders. A careful comparison is a must because some quotes can include the cost of plumbing, slab, and electrical fixtures, while others may not. So, you must evaluate all the key factors to determine how much it can cost to build Granny flats Sydney.

Things You Need to Know Before Building A Granny Flat

There are many benefits of building a granny flat on your property. It can help create safe and secure lodging for your family members or relative, increase your property’s value, or generate rental income. While it may seem a good decision to construct the building on your property, you should know many things about it.

1. Council Approval

Your location and living situation will affect what the council will require approval. It is recommended to visit your local council to check the eligibility requirements.

  • Get a development application
  • Check all the limitations and governing policies that need to be complied with
  • It can take 10 days to 8 weeks for your application to be approved

2. Size Considerations

There are certain minimum land size requirements for Granny flats. Even if you seem to have a large enough property, you should know what the local regulations say about the minimum required size. The minimum required size of the property in some states and territories is 450 sq.m. In different states, the maximum allowed building floor area ranges from 50 sq.m. to 80 sq.m.

3. Financing Your Granny Flat

If your home is still mortgaged, you will have to apply for a home loan for the addition. Your home’s equity can help in your loan application, it will still be required to demonstrate your eligibility for repayment.

  • Your home will have to be re-valued
  • Prepare your house and floor plans for appraisal
  • Pursue with banks with specialized products for developing accessory dwelling units

It may be required to refinance your existing mortgage.

4. Design Your Flats

Hire the services of a project manager or architect to design your flat. There are companies that specialize in designing and building Granny flats. The design will be created by taking the following factors, requirements, and regulations into account:

  • Number of rooms
  • Layout
  • Size
  • Measurements
  • Structure

It is recommended to discuss your rough idea with the architect to simplify the design process.

5. Renting the Flat

It is recommended to consider the purpose of the unit before you begin the design process. Many homeowners will build these units to increase the value of their property and rent it to tenants. This makes these flats excellent investment options. It is also recommended to get a professional opinion about the potential rental income and whether the cash flow can help you cover the cost of construction.

6. Duration of Construction

It will also help you to know how long your granny flat is going to take to build. Many factors will come to play here, including:

  • Installation of prefabricated units
  • Building from the ground up
  • Installing a flat pack

On average, you should expect a flat to take anything from 12 to 15 weeks to complete.

Besides these things, you should also know who can live in the unit. Different states have different rules for who is allowed to live in these buildings. For example, some states and territories allow only dependent persons or immediate family to live there. Once that person leaves or passes away, you may have to remove the building. If you are exploring rental opportunities, make sure to check your state’s laws whether it is allowed or not.

Things to Consider Before You Build a Granny Flat


Are you in search of an option to generate income from a property or provide accommodation to elderly or adult children in the family? Hopefully, you aren’t thinking of building a new house or renting one when rents and housing construction costs are on the rise. Building a granny flat is an attractive alternative. We at 5 Star Granny Flats are experts in this field and provide start-to-end granny flat design and build solutions. Here are some things you should consider before starting on the construction.

Detached Or Attached Granny Flat?

You can think of a freestanding granny flat or even add it as an extension to your existing house. Your preference is dependent on the extra space available in the present lot as well as the structure of your current home.

When you have a freestanding granny flat, it is a separate structure with a separate entrance and disconnected from the main house. Its main advantages are privacy, and an opportunity to rent it out as separate premises. However, it does not allow extension of the indoor areas of your house.

An attached granny flat is an annex to the existing house with a linked door. When you open the door, you add space to your house with an additional bedroom/en suite, etc.  Alternatively, you can use it to serve various purposes like a guest, children’s play/hobby or study room. If you want to rent it out, close the linking door, and it becomes a separate living space. 

Check Your local Council’s Rules and Regulations

Always keep the requirements of authorities in view. Find out dos and don’ts with the local Council. It is necessary to understand all the rules and regulations, changes, and modifications. These mainly revolve around health and safety or taxable income derived from the property. 

For example, if your property is under a single title, you are entitled to only one meter. If you decide to rent out the granny flat, you will receive all utility bills like electricity, water, internet, etc. in your name and would have to pay them.

Get Expert Financial Advice

Any property matter and financial aspect related to it go hand-in-hand. Try to know the estimate of the present value of your property. For example, if your budget for the addition of a granny flat is $100000, your property value will increase to that extent. Do you think such addition is worth the money and effort? In the short run, it may not, but if you start renting it out, you are adding to your regular income flow. It may suddenly look like a profitable earning proposition.

In the longer run, the value of the entire property may become multi-fold. A regular addition to your income is liable to be taxed. You need to understand and get clarification about these financial and taxation matters from your accountant and keep the local Council in the loop to ensure that your dealings are correct. For more information on our granny flat builder services, you can get in touch with us at 5 Star Granny Flats today! Just give us a call on 1300 843 921 or fill in this contact us form. You can also use this form to get a quick online quote.


Factors To Take Into Account While Constructing a Granny Flat

A granny flat is a small addition in the outdoor space of an existing property. Designed as a self-contained structure to accommodate one or two people, it provides independence and privacy. Some owners prefer to build it as an extension of the family home while some others prefer it as an independent structure.

Aspects To Consider Before Building A Granny Flat

We at 5 Star Granny Flats are one of the most sought-after granny flats’ builders. Our company offers excellent granny flat design, and we customize our services to suit our clients’ requirements.

As an addition to the existing property, granny flats are cheaper to build. However, the actual building cost depends upon several factors that builders consider. Look at these factors.

1. Standard Or Customised Flat

Depending on individual preferences, granny flats builders offer both standard and customized designs. Prefabricated kits available for easy installation of one or two bed-room flats are budget-friendly and make the granny flat building process quick. But custom-designed granny flats are popular because they give the homeowner the option to include the features they want; however, they are a little more expensive to build.

2. A Small Or A Big Flat?

People build granny flats depending on the availability of space on their property. They can construct three or four bedroom flats on a bigger property. It means that such a flat would require more material and labour to build and will be costlier than a standard small one.

3. Pre-Construction Work

The cost of building a granny flat increases if some preparatory work like earthwork is necessary before the actual building or installation work starts. In addition to excavation, some obstructions like trees, large stones need clearing, and the work adds to the cost. That is why granny flats builders inspect the area carefully where site clearance work is involved.

4. Requirements For Constructing Granny Flats

You need to understand the rules and regulations of building a granny flat before you hire a builder. While small differences in regulation from one state to another may exist, these are the general guidelines:

  • The minimum area of the property – 450m2
  • Zoning of property as residential
  • A minimum boundary of 3m at the rear and 0.9m from the side for any property
  • A maximum external area of 60m2 for a property

The Parameters of floor space requirement as follows:

  • 330m2 for 450 – 600m2 area
  • 380m2 for 600 – 900m2 area
  • 430m2 for 900m2 or more area

When you think of making some major changes to your home, building a granny flat is an attractive proposition to create an independent and private space.  If you are not inclined to subdivide the large space you own, building a granny flat at a small investment is advantageous. It creates an additional source of income and gives you a great space that you and your family can use as required.

For more information on our granny flat builders’ services, you can get in touch with us at 5 Star Granny Flats today! Just give us a call on 1300 843 921 or fill in this contact us form. You can also use this form to get a quick online quote.



The Differences Between Apartments and Granny Flats-Which One Is the Better Option?

Today, most states experience an increasing demand for granny flats. The relaxation and modifications in rules by some states and local governments have contributed to changing the face of granny flats. We at 5 Star Granny Flats have seen that people want their granny flats to have comfortable features and a more attractive look. However, there are still states and local councils that do not permit granny flat renting to other than family members.

Differences Between A Granny Flat And An Apartment

Let us understand the fundamental difference between a granny flat and an apartment. A granny flat is a self-contained place, mostly detached from the main building on the property. An apartment too is self-contained but is always part of a building.

One or two people can occupy a granny flat because it is essentially a separate small living place, generally built behind the bigger house. If the main house has a backyard, the granny flatshares it. Apartments and granny flats may not differ from each other in terms of the available space, but the state and local regulations decide the size of the granny flat.

Pros And Cons Of Living In A Granny Flat 

There are various pros and cons to living in granny flats, based on each individual’s needs.


  • A detached granny flat with the facility of an independent driveway and some yard space for parking is possible but not in case of an apartment
  • Designed with a focus on accessibility
  • The small size means less labour to keep it clean and neat
  • Lower on maintenance
  • If your family lives in the main house, quick help is available to fix any problem you face


  • Smaller space
  • With a smaller house, unlike large apartments, you need to learn to accommodate all your belongings in less storage space. That is inconvenient if you are used to living in a large house
  • While internal accessibility is an advantage, it could be inconvenient to negotiate a granny flat located in the backyard

Relocating To A Granny Flat

When you relocate in a granny flat, the two issues you may face are less space to live in and accessibility. The new skill that you need to learn is how to downsize and declutter your possessions, to make yourself feel comfortable in a much smaller place.

If you are moving into a granny flat on a property that your children own, you benefit from being able to live close to family. This is a great way of enjoying your independence yet being close enough to your kids and grandkids. We are custom granny flats builders that can design and build safe, practical, and very comfortable accommodation for the elderly, any other family members, or as a rental space.

For more information on our granny flat design services, you can get in touch with us at 5 Star Granny Flats today! Just give us a call on 1300 843 921 or fill in this contact us form. You can also use this form to get a quick online quote.


Why the Design Phase Of Your Granny Flat Is So Important

A granny flat is a small addition to your home, but it can be aesthetic, and a value-add to your home. What makes your home attractive, functional, and comfortable to live in its design. The same concept applies to granny flats.

We at 5 Star Granny Flats are the reputed designers and granny flat builders. We know the importance of the preliminary design stage when your granny flat begins to take some shape. It is crucial to work with the builder at the granny flat design stage because:

1. The Design Matters

Always start a housing project for a small house or a granny flat with clear ideas about your requirements. A builder shows you the standard design to initiate your thinking process and gives form to your ideas about the granny flat. You have the option of either modifying it to suit your needs or custom design it to match your dream house.

2. You Can Analyse Whether Your Builder Is Professional

You never sign a contract at the preliminary stage. When a builder visits your site, they listen to your ideas, requirements, budget, etc. Based on this information, they put forth some ideas for your consideration and tell you what is feasible and what is not. They also provide a ballpark figure for building the granny flat. You must be alert to know whether they agree to everything you say or arent interested in listening to you. Professional granny flat builders will always be attentive and proactive in their approach.

3. Include the Installations and Features You Need and Prefer

It is necessary to mention all the major and minor features and installations that you want in the structure. Set down clearly what you do not want. At this stage, you discuss the room arrangements, measurements, and provision to make any changes later.  At this stage, you need to decide the position of the entrance to your house or the granny flat.

4. The Budget Aspect

While you are in dialogue with your granny flat builder, you learn more about the stages of the construction project. You can gauge how realistic your expectations are and whether they synchronize with your budget. Never forget to decide the timeline for the project and the consequences of missing it.

5. Get a Good Virtual Presentation of your New Home

Your builder can give you a presentation of the preliminary design of your new home. It provides a  visual idea about:

  • Budgeted costs
  • A view of your final house with rooms etc
  • Demarcation of places like the kitchen, pantry bathrooms, and more

Working with the builder at this stage helps them give you a fixed price quote and provide you a practical and customized solution. For more information on our granny flat builders’ services, you can get in touch with us at 5 Star Granny Flats today! Just give us a call on 1300 843 921 or fill in this contact us form. You can also use this form to get a quick online quote.