ADU Design & Build · Campbell
ADU Builder in Campbell
Walkable downtown, light rail, near-zero vacancy — Campbell ADUs rent fast and pencil hard, at prices a tier under Los Gatos next door.
Campbell is the South Bay's sweet spot: genuine downtown charm — the Pruneyard, the farmers' market, the Ainsley House — with home prices a tier under Los Gatos next door. Buyers priced out of 95030 land here happily, which keeps demand (and ADU rents) strong while keeping your land basis reasonable.
The classic Campbell ADU project: convert the garage or add a backyard unit on a 1950s–70s ranch lot in San Tomas or Pruneside, then rent it to the downtown-lifestyle tenant pool that never seems to thin out. Light-rail access and walkability keep well-finished units near zero vacancy.
We handle the whole arc from 15 minutes away: feasibility on your parcel, a design tuned to Campbell's setbacks, the 60-day permit (Campbell's small department is genuinely fast for clean submittals), fixed-price construction, and rent guidance from our brokerage.
ADU permits in Campbell
Campbell Building Division (70 N. First St.) holds the 60-day state clock for compliant ADUs and is among the county's quickest departments for clean submittals — we've seen kitchen permits issue in under three weeks. State rules apply: 800 sq ft guaranteed on most lots, impact-fee exemption under 750 sq ft, ministerial approval with no hearings.
What’s included
Garage Conversion ADUs
The best-value Campbell path: existing structure becomes a studio/1BR for $125K–$220K.
Lot Feasibility Check First
Setbacks, utilities, and buildable envelope on your Campbell parcel — before you spend a dollar.
Detached New-Construction ADUs
400–1,000 sq ft backyard homes, including on the larger west-side lots.
Downtown-Tenant Pro Formas
Cost, rent, and payback modeled upfront — Campbell's near-zero vacancy is the selling point.
Fixed-Price Contracts
Locked construction pricing with milestone payments — no cost-plus roulette.
What it costs in Campbell
| Project | Typical Range | Notes |
|---|---|---|
| Garage conversion (≈400 sq ft) | $125K – $220K | Studio or 1BR — best value |
| Detached studio/1BR (400–600 sq ft) | $220K – $330K | $350–$550/sq ft |
| Detached 2BR (750–1,000 sq ft) | $320K – $480K | Larger west-side lots |
| Attached ADU | $300 – $450 / sq ft | Shares structure; saves foundation cost |
Units under 750 sq ft are exempt from impact fees statewide. Campbell ADUs rent at a walkable-downtown premium with near-zero vacancy.
What we build in Campbell
- Garage-conversion ADUs near downtown Campbell
- Detached ADUs on larger west-side lots
- Backyard rentals walkable to the Pruneyard & light rail
- Studio ADUs in San Tomas & Pruneside
- Multigenerational units for Los Gatos-overflow buyers
ADU Design & Build — full details
Process, scope, and everything our adu design & build service covers Bay Area-wide.
All services in Campbell
Remodels, ADUs, permits, real estate, and financing across Campbell.
Campbell ADU Design & Build FAQs
Is Campbell good for ADU rentals?+
Yes — walkable-downtown ADUs rent at a premium: studios $2,200–$2,700, 1BRs $2,500–$3,200 in 2026. Light-rail access and the downtown lifestyle keep vacancy near zero for well-finished units.
What does an ADU cost in Campbell?+
All-in: garage conversions $125K–$220K (the best value), detached 400–600 sq ft units $220K–$330K, detached 2-bedrooms $320K–$480K. Detached new construction runs $350–$550/sq ft, with prices a tier under Los Gatos.
How fast are Campbell ADU permits?+
Among the county's quickest for clean submittals — Campbell's small department knows its regulars, and professional packages move quickly. The state 60-day ministerial clock applies regardless.
Can you handle my Campbell fixer purchase plus an ADU?+
That's the BARC model: our realtor finds and negotiates the property, our estimators price the renovation and ADU before you offer, our lending desk structures purchase-plus-construction financing, and our crews build. One team, one number.
How long does a Campbell ADU take?+
Typically 8–13 months end to end; 4–6 months for a garage conversion. Campbell's fast permit turnaround for clean submittals keeps the schedule tight.
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