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What are the costs for 50sqm, 60sqm, and 80sqm granny flats?

Written by Louise Pershouse

Updated at March 31st, 2025

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Expandify offers standard designs in 50sqm and 80sqm formats. We do not currently offer a fixed 60sqm layout, but it may be achieved by modifying the Peak model.

Current options:

  • 50sqm (Crest): DIY from $99K / Complete from $135K
  • 80sqm (Peak): DIY from $149K / Complete from $185K

Custom sizing between these formats may be possible depending on layout and engineering. Your Preliminary Site Feasibility Check (Prelim) and Site Assessment will confirm whether a 60sqm-style build can be supported under your council code and site constraints.

Every price is based on:

  • Council and compliance requirements
  • Custom inclusions and any removals
  • Soil type and footing design
  • Builder installation invoice (for Complete Package only)

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