ADU & Home Additions in Fillmore

An addition is the most structurally demanding project you can take on. It requires real engineering — foundation design, load paths, lateral systems, and a structural connection to the existing home that won't crack or settle differently over time. We coordinate engineers and architects so the plans are buildable and the budget is honest.

ADUs (accessory dwelling units) are one of the smartest investments on a California property. We handle the full state ADU permitting path, Title 24 energy compliance, and utility connections end to end — from a backyard studio to a full two-story unit.

Learn more about adu & home additions or explore our Ventura County service area.

Feasibility

Setbacks, zoning, lot coverage, and a realistic budget before you spend on plans.

Design & Engineering

Architectural design, structural engineering, and Title 24 energy modeling.

Permitting

Full permit submission and plan-check response through your jurisdiction.

Foundation & Framing

Excavation, foundation, framing, and the structural tie-in to your home.

Finish & Handoff

Exterior matching, interior finishes, final inspection, and 5-year workmanship warranty plus manufacturer material warranties.

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Full-service construction & remodeling

ADU & Home Additions is just one of the services we offer in Fillmore. See our complete range of construction and remodeling services.

What is the difference between an ADU and a home addition?

An ADU (accessory dwelling unit) is a self-contained living space with its own kitchen, bathroom, and entrance — designed to be rented or used as a separate residence. A home addition adds square footage to the main house (a bedroom, family room, or second story) that's connected to the existing living space. ADUs follow California's streamlined permitting pathway with 60-day approval timelines; additions follow standard building permits. If your goal is rental income or multi-generational housing, an ADU is the answer. If your goal is more living space within the main home, an addition is the right choice.

What should I know before building an ADU?

Before investing in architectural plans, evaluate setbacks (how close you can build to property lines), lot coverage limits, height restrictions, zoning, and whether the lot can accommodate utility connections. California state law has overridden many local restrictions for ADUs — but local rules still apply to height, setbacks, and parking in some cases. A feasibility study should come first so you know what's possible and what it will realistically cost before committing to design.

How does the ADU permitting process work in California?

California's ADU law (Government Code §65852.2) provides a streamlined ministerial approval process — meaning the city must approve or deny an ADU application within 60 days, without discretionary review. This is dramatically faster than a standard building permit, which can take months of plan check and design review. For home additions, standard permitting applies, including neighborhood design review in some cities.

Who handles permits for adus & additions in Fillmore?

Fillmore is a small incorporated city with its own Building and Safety Division. A licensed general contractor pulls all required permits and coordinates inspections with the appropriate building department so the work is legal, insurable, and documented for resale.

How do I get a adus & additions estimate in Fillmore?

Call (818) 205-8820 or fill out the contact form below. A project manager will visit your Fillmore property, assess the scope, and provide an honest, itemized estimate — no pressure, no obligation. Learn more about our adu & home additions services or explore all services in Fillmore.