Architect designed Granny Flats - Granny Flat Designs Brisbane

Looking for architect-designed granny flats? Ashcroft Architects offers premium granny flat designs in Brisbane that perfectly blend style and functionality

At Ashcroft Architects, we craft high-quality granny flat designs in Brisbane and surrounds.

Our granny flats designs are tailored to your specific needs and preferences. Ashcroft Architects’ team of experienced architects and designers work closely with you to bring your vision to life.

Everything you need to know about granny flats

Also known as a secondary dwelling, a granny flat is a self-contained unit that can be built on the same lot as your principal dwelling.
Granny flats can be used for a variety of purposes.

A granny flat typically includes a bedroom, bathroom, kitchen, and living area, and is designed to be separate from the main house.
Granny flats are often used to house elderly relatives, (hence the name), but they can also be used for other purposes, such as a parent or teenage retreat, a guest house, or a rental property.

Ashcroft Architects offer a range of architectural services for residential properties in Brisbane, including designing and constructing granny flats in partnership with experienced granny flat builders in Brisbane.

Contact Ashcroft Architects Today

Advantages of architect-designed granny flats

Architect-designed granny flats offer many advantages over traditional designs. They are not only visually stunning but also functional and practical.

We use the latest design techniques to create spacious, natural light-filled living spaces that are comfortable and inviting.

Our designs are tailored to suit your individual needs and are flexible enough to accommodate future changes in your lifestyle.

There are many benefits to building a granny flat on your property. Here are just a few:


Extra living space

A granny flat provides additional living space on your property, which can be used for a variety of purposes. Whether you need extra space for the family or a home office, a granny flat is a cost-effective solution to solve a growing family’s problems.

Increased property value

Adding a granny flat to your property can increase its value, as it provides additional living space and can be used as a rental property.

Additional rental income

If you choose to rent out your granny flat, it can provide a source of rental income, which can help pay off your mortgage or provide extra income. You can rent out the flat for long-term tenants or even open it up as a short-term homestay.

Lower build costs 

Building a granny flat is often more cost-effective than building a traditional single-family home. With fewer materials and a smaller footprint, you can save money on construction costs.

Less council and land costs

In addition to lower construction costs, you may also save on council and land costs, as granny flats typically have little to no impact on rates.

Faster construction time

Unlike larger homes, granny flats can be built in a relatively short amount of time, with construction typically taking around 16 weeks from start to finish.

Important considerations when building a granny flat

While there are many benefits to building a granny flat, it's important to consider some key aspects during the planning and construction process. Here are four important considerations to keep in mind:


When designing a granny flat, consider how individuals will access the property. Make sure there is a clear and easy pathway or route to the flat that doesn’t intrude on your living space.


Not all backyards have side access or enough space for parking. Consider whether your guests or tenants will park on the road or in a designated car park.


To improve the functionality and comfort of both buildings, it’s important to plan for privacy. Ensure that the granny flat’s entrances and windows are facing away from the main house or create entrances that won’t intrude on your own living space.

Proper planning of your landscaping and the position of your granny flat is important for long-term success. Consider adding fake grass or using hedging for easy maintenance and removing any trees that may cause mess or require constant cleaning.

Granny flat design options & size regulations

If you’re considering building a granny flat, it’s important to understand the size limitations and design options available.

In Australia, for most councils the maximum floor area for a granny flat is 50m². This means that your granny flat will need to be smaller than your main dwelling and designed to fit within the available space on your property. 

However, keep in mind that some councils may have different size restrictions or other regulations that you need to follow. It’s always a good idea to check with your local council before you start building. Ashcroft Architects can help you navigate these often tricky waters.


Our granny flats are designed to blend seamlessly with your existing home and can be customised to match the style and colour scheme of your main residence.

Despite the size limitations, there are still plenty of design options available when it comes to building a granny flat. 

You can choose from single or double-storey designs, depending on your needs and budget. You can also customise the layout and features of your granny flat to suit your specific requirements. For example, you might want to include a separate bedroom, bathroom, kitchen, or living area.

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Build a granny flat in Brisbane with Ashcroft Architects

We are a leading architectural firm in Brisbane, taking a personalised approach to each individual project.

We work with you to understand your unique needs and preferences, ensuring that your granny flat is a true reflection of your individual style as well as your needs.


Our granny flat build process

Step 1: Pre-planning discussion

Our design process begins with a thorough consultation, during which we discuss your ideas, needs, and budget. Is the Granny Flat for adult children or an elderly parent? What level of connection is desired with the main dwelling? Will the use of the Granny Flat change overtime? Our Architects are experts in finding solutions and opportunities that you may not have thought possible. Extensive experience and intricate knowledge means we can provide options based on the best possible outcome for your budget and space requirements.

Step 2: Due Diligence

Ashcroft Architects undertake a site inspection to review the topography of the site, the location of existing dwellings, site access, the breezes, the neighbouring properties, privacy considerations, available views, accessibility, and nearby services. We will arrange for a survey on your land, identifying a range of features such as the contours, the condition of the soil (geotechnical survey), and any NBN, gas, wastewater or plumbing works.

Step 3: Design Solutions

Now that we have met the clients and viewed the property, we go away and do what we do best! We design site plans, floor plans and an interactive, digital 3D model of the proposed Granny Flat.
The design will address privacy measures, access in relation to the site and existing dwelling, parking requirements and more. Your Granny Flat should look beautiful too! Our Architects spend time carefully crafting your Granny Flat design so that it will feel spacious and light filled even if it is compact, and ensure it complements and enhances the look of your existing home.

Step 4: Approvals and Construction

Once designs are finalised we get to work ensuring all of the necessary approvals are obtained and building regulations are met. Next, your approved designs are passed along to your builders, who work their magic to bring our vision to life. Our office is with you and your builder along the way with regular site inspections and advice during the construction process.

Step 1: Pre-planning discussion

Our Redlands architects have a pre-design meeting with you to create a client brief document. This document will include components like preliminary budgets, sizes, and rooms, and further information about the site where the house will be built.

This meeting and documentation formulates the design requirements to set realistic targets and expectations for the project.

Step 2: Due diligence

Ashcroft Architects undertake a site inspection to review the topography of the site, the breezes, the neighbouring properties, privacy considerations, available views, accessibility, and nearby services.

We will arrange for a survey on your land, identifying a range of features such as the contours, the condition of the soil (geotechnical survey), and any NBN, gas, wastewater or plumbing works.

Let us help you bring your plans to life: choose Ashcroft Architects as your trusted granny flat architects in Brisbane

If you’re looking for architecturally designed granny flats in Brisbane, Ashcroft Architects is the perfect choice.

Our team of experienced architectural designers will work with you to create a beautiful and functional Granny Flat that perfectly suits your needs and lifestyle.


Contact us today on (07) 3206 0239 to schedule a consultation and take the first step towards your dream granny flat.



Contact Ashcroft Architects Granny Flat Architects Today

Take the first step towards your dream development and start the conversation today

Our qualified team of experienced architects are ready to help. Give us a call and we will get back to you shortly.

Our office is located in Sheldon and we service the entire Brisbane region, including (but not limited to) Bayside, Redlands, Capalaba, Wellington Point, Victoria Point, Redland Bay, and Mt Cotton.