Secondary Dwelling Inquiry / Feasibility Check

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

 

If you have not yet explored our 'Secondary Dwelling Council Requirements' webpage, please do so before completing this form.

 

We review every submission personally to confirm suitability before moving forward. 

 

Please allow 2–3 minutes to complete.

Thanks for your enquiry.

Based on your response, we’re unable to proceed with your request at this stage.

This may be because you have not yet reviewed our 'Secondary Dwelling Council Requirements' webpage or your current budget does not align with minimum build costs.

We recommend reviewing the relevant information on our website and adjusting where needed.

Once ready, you’re very welcome to resubmit your enquiry—we’d love to help.

 

 

Thank You,

C.J Carpentry & Construction (QLD) PTY LTD

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.