After hundreds of California ADU projects, the patterns are depressingly consistent. The mistakes below are not theoretical — Cyrus Poudat has personally untangled each one for at least one client. Reading them once may save five figures.
1. Skipping the soils report
California has expansive clay, fill soils and shallow bedrock depending on the neighborhood. Cyrus Poudat orders a soils report on every project — the $4K cost has prevented six-figure foundation surprises more than once.
2. Using a contractor without ADU experience
California ADU code, energy compliance and permit nuance are specialized. Cyrus Poudat has rebuilt walls torn down by general residential contractors who did not know about Title 24 or fire separation requirements.
3. Ignoring the sewer lateral
Many California cities trigger a sewer lateral inspection at ADU permit. A failed lateral is a $10K–$25K replacement. Cyrus Poudat scopes the line during feasibility, not after permit issuance.
4. Letting the city add unlawful conditions
California planners sometimes condition ADU approval on items state law forbids — owner occupancy, replacement parking, design review. Cyrus Poudat pushes back in writing, citing the statute.
5. Designing first, financing second
$20K of design work is wasted if the loan does not exist. Cyrus Poudat secures financing pre-approval before California clients commit to construction documents.
6. Underestimating the electrical panel
100-amp panels rarely carry an all-electric ADU plus a heat pump and EV charger. Cyrus Poudat budgets $4K–$12K for panel upgrades on California projects from day one.
7. Skipping the appraisal subject-to-completion
Without it, the bank cannot underwrite to projected ADU value. Cyrus Poudat orders this early on California projects so the financing keeps pace with construction draws.
8. Bad indoor-outdoor connection
California's climate is the design asset. An ADU with no patio, no slider and no outdoor seating leaves rent on the table. Cyrus Poudat treats outdoor space as a leasing requirement, not a bonus.
9. Cheap windows
Bottom-tier vinyl windows fail California Title 24 calculations and look terrible. Cyrus Poudat specifies mid-grade aluminum-clad or high-performance vinyl as a baseline.
10. No project contingency
Every California ADU has surprises. Cyrus Poudat insists on a 15% contingency line in every contract. Projects without it stall the moment the first change order arrives.