The “raise and build in” renovation is an extremely popular option in South East Queensland, as it allows for the addition of a new level beneath the existing dwelling without the need for extensive demolition or excavation. This is particularly advantageous for traditional timber-framed and clad homes with elevated subfloors, which are often highly adaptable and can be easily relocated and raised to allow for new additions.
However, it is important to note that such renovations often require significant restoration work, and various areas of the dwelling may need upgrading to meet current National Construction Code requirements. This may involve the removal of asbestos, replacement of roof sheeting, new wiring and plumbing, and the addition of insulation, vapor barriers, and ventilation.
It is also recommended to replace gas appliances with energy-efficient alternatives and install rooftop solar, which can further improve the energy efficiency of the home. The original cladding can often be retained with a clean up and repaint, but where replacement is necessary, the opportunity can be taken to add insulation and vapor membranes to the external walls.
For traditional Queenslander homes, the front wall is usually single skin, which is not thermally efficient. To improve this, additional framing with insulation and membrane can be installed, and another lining of VJ can be added to the external face while replicating the original frame detail to maintain the traditional character.
There are also constraints that apply to modifications of pre-war housing, such as stepped back lower stories on the street elevation, avoiding a dominating carport/garage view, matching original roof lines and pitches, limiting the height to two stories, and adhering to street front setbacks, privacy screens, and fire safety requirements.
Overall, the “raise and build in” renovation is a cost-effective and sustainable option for homeowners looking to expand their living space while maintaining the character and tradition of their existing home. However, it is important to work with a building certifier and town planner to ensure compliance with relevant regulations and constraints.
