Building an ADU in Pasadena: what it costs and what to expect

State law removes the parking requirement in several circumstances, including where the property is within a short walking distance of public transit, and Pasadena is well served by transit in many neighbourhoods. Because the qualifying conditions have been amended repeatedly, confirm your specific address against the current rule with the planning counter rather than assuming either way. If parking is not required, do not let a design add it out of habit, because a parking space consumes yard area you may want for the unit.

It is genuinely cheaper in most cases, because the foundation, walls and roof already exist and the site work is usually shorter. It is not automatically simple. Older garage slabs are often thin, uninsulated, poured without a vapour barrier, and sometimes lower than the surrounding grade, and the walls may sit on a footing that was never designed to carry a habitable structure. Have someone assess the existing slab and framing before you commit to a budget, because remediating a bad slab can erase the saving.

Under the ministerial review that state law requires, there is no public hearing at which a neighbour objects and a body decides. Review is a compliance check against objective written standards. Neighbours can and do raise practical issues during construction, such as noise hours, dust, parking of work vehicles and shared fences, and those are worth handling well because they last longer than the build. But an ADU that meets the objective standards is not approved by permission.

Both, for different purposes. Early conversations tell you whether your budget and your ambition are in the same neighbourhood. Real, comparable, binding numbers come from bidding an approved permit set, because then every contractor is pricing exactly the same building with the same engineering. If you take only one thing from this: never compare two quotes that were written against different scopes.

Confirm the licence directly with the California Contractors State License Board, including status, classification, expiry and bond. Have the insurance agent send you a current certificate of general liability and workers' compensation coverage directly. Require a written scope tied to specific drawing sheets, an itemised allowance schedule, a written change order process with pricing before work proceeds, and a payment schedule tied to completed milestones. California limits residential down payments, so treat a large up-front demand as a reason to slow down. Tegula Stone does not perform these checks for you and does not vouch for any contractor, so make them yourself in every case.