Secondary Dwelling Inquiry / Feasibility Check

Thank you for your interest in building a secondary dwelling with C.J Carpentry & Construction.

This quick application helps us understand your property, goals, and budget so we can determine if your project is a good fit.

Please allow 2–3 minutes to complete.

Most of our secondary dwelling projects fall between $250,000 – $350,000 depending on design and site conditions.
 

 

Building a secondary dwelling (class 1A structure) will require both council approval and building certification.

This typically involves:

• Draftsman or building designer plans
• Soil testing
• Structural engineering
• Building certification
• Energy efficiency (and bushfire assessment if required)
• Council plumbing permit

These are essential steps to ensure your project complies with local regulations and allows us to provide an accurate build cost.

At C.J Carpentry & Construction, we can coordinate this entire process for you, or you’re welcome to begin the process yourself by organising your own plans if preferred.

Typical design & approval costs range from $10,000 – $20,000+, depending on the site, services (sewered or unsewered), and overall project complexity.

 

For more information on requirements in Queensland, you can refer to:
Queensland Government – Building Laws & Codes

Once plans are finalised, we’re able to provide a detailed and accurate quotation for your project.