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California / Oakland / ADU builders

ADU builders in Oakland, California

The short answer

19 licensed contractors building accessory dwelling units in Oakland. Every licence below was checked against the California state register. Oakland does not publish contractor names on building permits, so this list ranks on licence standing and pre-approved plans.

California Contractors State License Board, checked 2026-08-15
How to read this. Licence details come from the California Contractors State License Board and are dated on each profile. Permit counts reflect only those cities that publish the contractor's name on a building permit, so a builder with none listed may simply have worked where nothing is published. A city that pre-approves a plan has vetted the plan, not the builder, and does not endorse it. ADU Standards takes no payment for placement. Confirm any licence at cslb.ca.gov before you sign.

Ordered by what the records confirm

The list
1

Acton Construction Inc

Nearby permits Licence clear 34 years licensed Workers’ comp on file

CSLB #638333 · CAMPBELL

6

Buildzig

Licensed Licence clear 14 years licensed Workers’ comp on file

CSLB #970015 · OAKLAND

7

Quartz Construction

Licensed Licence clear 11 years licensed Workers’ comp on file

CSLB #1003436 · SAN JOSE

8

J A B Construction

Licensed Licence clear 27 years licensed No workers’ comp on file

CSLB #765383 · HAYWARD

9

Imkat Construction Corp

Nearby permits Licence clear 4 years licensed Workers’ comp on file

CSLB #1094866 · SACRAMENTO

11

Bay Home Remodeling Inc

Licensed Licence clear 8 years licensed Workers’ comp on file

CSLB #1042086 · ORINDA

12

Adore Homes Inc

Nearby permits Licence clear 0 years licensed Workers’ comp on file

CSLB #1145340 · LOS GATOS

14

Type Five Inc

Licensed Licence clear 4 years licensed Workers’ comp on file

CSLB #1086540 · BERKELEY

16

Loona Construction Inc

Licensed Licence clear 3 years licensed No workers’ comp on file

CSLB #1095467 · NEWARK

19

Optivest Build Inc

Licensed Licence clear 0 years licensed Workers’ comp on file

CSLB #1144711 · WALNUT CREEK

What Oakland charges

The city’s published schedule

Quoted from Oakland’s own fee schedule (FY 2025-26). These are city fees only. They do not include what a builder charges to design and build the unit.

Plan check
basis flat ADU-specific zoning review fee, plus valuation-based building plan check
adu zoning review detail Secondary Units/ADU - CAT I, II, III: $491.62 base + $35.40 General Plan Update (7.2%) = $527.02 subtotal + $66.93 Tech/Records (12.70%) = $593.95 grand total. Secondary Units/ADU - CAT IV: $738.77 + $53.19 + $100.58 = $892.54 grand total. Secondary Units/ADU - Amnesty Program: $1,473.16 + $106.07 + $200.56 = $1,779.79 grand total.
source Zoning Permit Fees Schedule FY 2025-2026, section IV. Over the Counter Design Review
as of 2025-09-18
Building permit
basis percentage of project value
detail Building Permit Fees: Usually 4-6% of project value; more details available at the Building Permit Counter (250 Frank H. Ogawa Plaza, Suite 2114).
source https://www.oaklandca.gov/Planning-Building/Building-Construction-Permits-Inspections/Impact-Fees
as of page current as of 2026-08-14
School district fees
rate Residential: $5.17 per square foot. Commercial: $0.84 per square foot.
collected by Collected by the Planning and Building Department on behalf of the Oakland Unified School District. Contact OUSD Facilities Planning and Management Department, (510) 879-2700 or ousdfacilities@ousd.org.
note The city page publishes the rate but states no square-footage threshold. State law (Educ. Code sec. 17620(a)(1)(C)(i)) exempts ADUs of less than 500 sq ft. The page carries no date; the $5.17/$0.84 pair matches the State Allocation Board Level 1 residential/commercial rates.
as of page current as of 2026-08-14
Utility connections
sewer lateral New Sewer Lateral Connection: (Includes Accessory Dwelling Unit and Mobile Home) - fee varies by connection type: (a) lateral connect to existing lateral, (b) lateral connect to sewer main in easement, (c) lateral connect to sewer main in sidewalk/roadway (additional engineering review and inspection charges may apply). Listed in the FY 2025-26 Adopted Master Fee Schedule, Engineering section.
adu note Detached ADUs will need a sewer lateral permit to connect sewage service to the unit. If construction valuation is over $100K an EBMUD Private Sewer Lateral Compliance Certificate is required.
water Not a city fee. New water meter fees: see East Bay MUD (EBMUD).
gas Depending on whether the ADU appliances are vented appliances, a separate gas meter for the ADU may be needed.
extraction note The dollar amounts in the Oakland Master Fee Schedule sewer lateral table did not survive text extraction from the PDF; the fee line items are confirmed but the amounts should be read off the PDF directly before publication.
source https://www.oaklandca.gov/files/assets/city/v/4/finance/documents/financial-reporting/master-fee-schedules/fiscal-year-2025-26-adopted-mfs.pdf
Impact fees
rate sheet Impact Fee Rates Effective September 13, 2025 (amendment effective July 15, 2025). Single-Family Housing Affordable Housing Impact Fee: Zone 1 $12.66/sq ft, Zone 2 $9.08/sq ft, Zone 3 $4.40/sq ft. Single-Family Capital Improvements Impact Fee: Zone 1 $2.94/sq ft, Zone 2 $2.21/sq ft, Zone 3 $0.74/sq ft. Single-Family Transportation Impact Fee: $0.74/sq ft in all three zones.
applicability verbatim Types of Projects That Must Pay Impact Fees - Affordable Housing Impact Fees: New housing units (single-family homes, townhomes, apartments, live/work or work/live units). Transportation & Capital Improvements Impact Fees: New housing units (same as above).
timing Starting September 13, 2025, all fees will be charged per square foot and must be paid when the Certificate of Occupancy (CO) is issued. (Fees will still be calculated when your complete permit application is submitted.)
city statement on adus No ADU exemption appears on the Impact Fees page, in the 2025 Impact Fees Rate Sheet and Zone Map, or in the Guide to Applying for ADUs on Lots with Single-Family Homes.

Oakland’s published schedule does not mention the exemption for ADUs under 750 square feet. California Government Code section 66311.5(c)(1) bars a local agency from imposing impact fees on an accessory dwelling unit of less than 750 square feet. If you are quoted impact fees on a unit that size, ask the city which section authorises them.

Oakland fee scheduleFee schedule PDF

Common questions

How is this list ordered?

By what can be confirmed in public records: the number of accessory dwelling unit permits each contractor has on file in Oakland, whether Oakland has pre-approved their plans, and their licence standing with the California Contractors State License Board. No builder pays for position and none can request removal.

Are these builders licensed?

Every company listed has been matched to an active California contractor licence and its standing is shown on the card. California law requires a contractor to display its licence number in all advertising, and we check the number shown against the state register before publishing anything a company says about itself.

Why do some show no permit history?

Most California cities do not publish the contractor's name on a building permit. Where a city does not publish it, we cannot confirm completed work, so the card says the licence is verified and nothing more. Ask a builder directly for recent addresses and permit numbers you can look up.

What does it mean that Oakland pre-approved a builder's plans?

Under Government Code section 65852.27 every California city must accept ADU plans for pre-approval and publish the resulting list. A pre-approved plan has cleared plan check in advance, which shortens permitting. It is an approval of the plan, not an endorsement of the company that drew it.

Companies we looked at and left out

Also considered

These came up when looking for ADU builders in Oakland but did not meet the bar for the list above, usually because they do not advertise a California licence number, do not name Oakland as an area they serve, or do not present accessory dwelling units as a service they offer. They are shown so the list above can be checked rather than taken on trust.

Four checks worth ten minutes.

Before you sign
  1. Look the licence up yourself at cslb.ca.gov. It takes under a minute and shows the current status, any suspensions, and the bond.
  2. Ask who carries workers’ compensation for the crew and for every subcontractor. A licensee with no employees may lawfully be exempt, but if someone is hurt on your property you can end up treated as the employer.
  3. Ask for two recent permit numbers in any city, then look them up. A builder who has done the work can produce them immediately.
  4. Get the price in writing against a drawing set. A published starting price is for a base model and rarely includes site work, utilities, or Oakland fees.