Cost of a 310 square foot guest house in Berkeley, CA

The cost of a recently completed super-small guest house in Berkeley, CA, was $130,695 at the time of the project. (Updated for 2020, the cost would be $173,000.) The full costs are detailed in the line item budget here.

A summary of the costs is below:

$1,200: Survey

$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 design fees

$97,736: Construction costs

Here is a summary of the plans:

The full line item budget is here: budget 310 square foot detached cottage

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