The cost of a recently completed super small guest house in Berkeley, CA was $130,695. The full costs are detailed in the line item budget here.
A summary of the costs are:
$3,312: Planning (Zoning) permits
$3,650: Structural Engineering
$550: Energy efficiency report
$2,830: Building permit
$563: Mechanical, electrical and plumbing permit
$20,854: Hourly architecture fees
$97,736: Construction Costs ($315 per square foot)
Here is a summary of the plans:
The full line item budget is here: budget 310 square foot detached cottage
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