Granny Flat Builders: A Step-by-Step Construction Guide

10 July 2023

Explore our step-by-step construction guide for granny flat builders. Build your dream space with expert assistance from Romad Projects.

Building a granny flat can be an excellent solution for homeowners looking to expand their living space or accommodate additional family members. Whether you need a separate living area for an aging parent, a home office, or a rental unit, constructing a granny flat provides flexibility and convenience. In this step-by-step construction guide, we will walk you through building a granny flat from start to finish.

Planning and Design

Thorough planning and design are essential before embarking on your granny flat construction project. Consider the purpose of the granny flat, its size and layout, and how it will integrate with the existing property. Consult with architects or designers to create a functional and aesthetically pleasing design that meets your needs and complies with local building regulations.

Permits and Approvals

Obtaining the necessary permits and approvals is crucial in building a granny flat. Contact your local planning department or council to understand the regulations and requirements specific to your area. Ensure you have all the necessary documentation, including architectural plans, engineering reports, and environmental impact assessments, to facilitate a smooth approval process.

Foundation and Site Preparation

Prepare the site for construction by clearing the area and levelling the ground. The foundation of your granny flat is crucial for its stability and durability. You may choose between a concrete slab or a raised foundation, depending on the soil conditions. Engage professional contractors to excavate the site, pour the foundation, and install necessary drainage systems.

Framing and Structural Elements

Once the foundation is in place, the framing of your granny flat begins. This includes constructing the walls, roof structure, and floor system. Choose quality building materials and work with experienced carpenters to ensure the structural integrity of your granny flat. Proper framing is crucial to support the roof’s weight and maintain a sturdy and safe structure.

Roofing and Insulation

Next, focus on the roofing and insulation of your granny flat. Select suitable roofing materials that complement the overall design and provide adequate protection against the elements. Install insulation in the walls, roof, and floor to improve energy efficiency and create a comfortable living space. Consider using eco-friendly insulation options to reduce your environmental footprint.

Plumbing and Electrical Installation

Installing plumbing and electrical systems is critical to building a granny flat. Engage licenced professionals to handle these aspects, ensuring compliance with local codes and regulations. Plan the placement of electrical outlets, lighting fixtures, and plumbing fixtures strategically to maximise functionality and convenience.

Interior Finishes

As the construction progresses, shift your focus to the interior finishes of your granny flat. This includes selecting and installing doors, windows, and skylights. Choose materials for ceilings, walls, and trims that align with your desired aesthetic and budget. Coordinate with painters, carpenters, and other tradespeople to achieve a polished and cohesive interior look.

Flooring and Wall Coverings

Select suitable flooring options that suit your granny flat’s intended use and style. Whether you prefer hardwood, laminate, tile, or carpet, ensure the flooring materials are durable, low-maintenance, and visually appealing. Similarly, choose wall coverings such as paint, wallpaper, or panelling that enhance the space’s ambience.

Kitchen and Bathroom Installation

The kitchen and bathroom are key areas of any granny flat. Install functional and space-saving fixtures, such as cabinets, countertops, sinks, and appliances, in the kitchen. In the bathroom, focus on installing a shower, toilet, vanity, and other necessary fittings. Hire experienced plumbers and tradespeople to ensure proper installation and adherence to plumbing codes.

Exterior Finishes

The exterior finishes of your granny flat play a crucial role in its overall aesthetics. Choose a suitable cladding material, such as brick, timber, or render, that complements the existing property and withstands the elements. Pay attention to details such as windows, doors, and landscaping to create an inviting and visually appealing exterior.


Complete your granny flat construction project by enhancing the surrounding landscape. Consider pathways, outdoor seating areas, and garden beds to create an inviting outdoor space. Choose low-maintenance plants and incorporate elements that promote sustainability, such as rainwater harvesting systems or native plantings.


Building a granny flat provides a versatile and practical solution for expanding your living space or accommodating loved ones. By following this step-by-step construction guide, you can confidently embark on your granny flat project. Consult with professionals here at Romad Projects, adhere to local regulations, and prioritise quality materials and craftsmanship. Enjoy the process and create a beautiful, functional granny flat tailored to your needs.

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