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Budget-first ADU planning and design-build path
Peninsula city hub
San Mateo ADU planning should start with city standards, permit fee assumptions, and whether the homeowner is using preapproved or custom plans.
Project demand
San Mateo publishes ADU/JADU information, permit fee notes, standards, submittal guides, and official contacts.
Providers
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Budget-first ADU planning and design-build path
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Prefab detached ADU with turnkey delivery and permit support
Source noted
Custom and predesigned ADU design-build for complex Bay Area lots
Source noted Architect-led ADU design, permitting, plan catalog, and builder-selection support
Source noted
Full-service hybrid prefab ADU for design-forward Bay Area yards
Source noted
ADU coordination with Signature plans and licensed-contractor construction path
Official sources
Use official city resources as the source of truth before submitting plans.
FAQ
Start with ADU type, local experience, permit responsibility, drawings, budget assumptions, utility scope, and similar project examples in or near San Mateo.
Detached ADU, Garage conversion, Preapproved plans, JADU
Usually yes for serious pricing. Drawings make bids comparable and reduce expensive ambiguity.