ADU Construction
Detached, attached, and garage conversions. We handle design, permitting, and build under one contract – and we know California ADU law cold.
$150K - $450K+
Adu construction
CSLB #1041528 — Family-Owned, Pacifica-Based
Design-Build on the Peninsula.
ADUs, room additions, and whole home renovations — from foundation to finishes under one contract. We do the structural work ourselves.
What We Build
Six Services, One Contractor
From a garage conversion to a complete gut renovation — ACI manages design, permitting, and construction under a single contract. No juggling an architect, a permit expeditor, and a GC. One company, one point of contact.
Home Additions
Second stories, primary suites, family room additions. Structural engineering in-house. We know which walls carry lead and which don’t.
$300 - $700/sfHome AdditionsWhole Home Renovation
Foundation to finishes. Peninsula homes from the 1950s need everything replaced – galvanized plumbing, 60-amp panels, no insulation. We’ve done hundreds.
$150 - $500/sfWhole Home RenovationKitchen Remodeling
Layout changes, new appliances, custom cabinetry, countertops, and full MEP coordination. The kithen is where budget decisions compound fast.
$30K - $175K+Kitchen RemodelingBathroom Remodeling
Tile, fixtures, vanities, and the plumbing and electrical behind them. We scope from the infrastructure first, not the finish selections.
$15K - $90K+Bathroom RemodelingCommercial Construction
Restaurant build-outs, office tenant improvement, retail and mixed-use. ADA compliance, commercial MEP, hood systems – we know commercial code.
Project-BasedCommercial Construction
Why ACI
Why Peninsula Homeowners Choose ACI
We start with the structure, not the finishes
Most companies pick countertops before checking the foundation. We reverse that. Assessment, structural scope, and system replacement come first.
We do the heavy work ourselves
Foundation, framing, retaining walls, seismic retrofitting — our crew does this every day. We don't sub out the work that determines whether your structure stands straight.
One team, one contract
Design-build means you're not juggling an architect, permit expeditor, and GC. One company, one contract, one person to call when anything comes up.
We know hillside construction
Based in Pacifica — a city built on hills. Retaining walls, pier foundations, grading, and drainage aren't unusual add-ons for us. They're part of how we build.
Honest scoping, honest budgets
We publish cost ranges on every service page. We'd rather lose a project to honest numbers than win it with a lowball estimate that balloons in the field.
CSLB #1041528
Licensed GC — Class B
Bonded & Insured
Family-Owned
Pacifica Based
Our Process
From Your First Call to Certificate of Occupancy
One team handles everything — design, permitting, and construction under one contract.
Site Visit
Free assessment of your property — grade, setbacks, access, utilities, and what's structurally feasible.
Design & Engineering
Floor plans, structural engineering, geotechnical reports, and Title 24 calculations — all coordinated in-house.
Permitting
We prepare and submit the complete permit package, respond to plan check comments, and track every deadline.
Construction
Our crew handles foundation, framing, and structural work directly. We coordinate MEP subs and manage through finishes.
Completion
We schedule every required inspection and don't consider the project complete until you have your Certificate of Occupancy.
Typical timeline: 6–10 months for an ADU from permit approval. Whole-home renovations: 8–14 months depending on scope. We set the schedule in writing before we break ground.
Service Area
Serving the San Francisco Peninsula
Based in Pacifica, ACI builds throughout the Peninsula — from San Francisco south to Redwood City, including the Coastside.
- 📍Pacifica
Our home base. We know these hillside lots, the planning department, and the soil conditions better than anyone.
- 📍San Francisco
The largest ADU market on the Peninsula. Complex permitting, but enormous opportunity when done right.
- 📍Daly City
Dense housing stock, smaller lots, and high demand for garage conversions and attached ADUs near BART.
- 📍South San Francisco
Post-war housing with growing renovation demand driven by biotech employment and rising property values.
- 📍San Bruno & Millbrae
Suburban lots near SFO with room for detached ADUs and strong rental demand from airport and biotech workers.
- 📍Burlingame & San Mateo
Established neighborhoods with high property values and strong ROI on whole-home renovations and additions.
- 📍Half Moon Bay
Coastside construction expertise — we understand the specific conditions, codes, and access challenges out here.
- 📍Elsewhere on the Peninsula
Brisbane, Colma, Belmont, San Carlos, and more. Call us to discuss your project and location.