Home addition contractors in Berkeley, CA
No contractors are listed for addition work in Berkeley yet. CSLB license data dated Oct 16, 2026.
Which license do you need?
B license required. An addition needs a B (General Building) contractor. A B-2 may not touch footings, foundations, load-bearing walls or roof structure, and every addition does.
Do you need a permit?
Check with Berkeley first. An addition may need a Zoning Certificate, an Administrative Use Permit from the Zoning Officer, or a Use Permit from the Zoning Adjustments Board after a public hearing.
Source: City of Berkeley, Land Use Planning, Oct 18, 2026
Home addition contractors in Berkeley
No contractors listed here yet.
We list contractors here only when city permit records or the contractor show they do addition remodels. None so far. For a wider set of licensed builders, see the Berkeley general contractor list and ask each for addition projects they've finished.
Payment doesn't change the order. Business build-out? See commercial GCs. Each card shows CSLB data from the file dated Oct 16, 2026. Verify live on CSLB.
Permits in Berkeley
Permits go through City of Berkeley Permit Service Center, 1947 Center Street, 3rd Floor. Put in the contract who pulls the permit.
Berkeley plan-checks most kitchen and bath remodels over the counter in about 30 minutes during a Permit Service Center appointment; other projects take 1 to 6 weeks. Plans must be unsecured PDFs under 195 MB each, brought on a USB drive.
Source: City of Berkeley, Permit Service Center, checked Oct 18, 2026
Changing a City Landmark, a Structure of Merit or a house in a historic district needs a Structural Alteration Permit from the Landmarks Preservation Commission, which typically takes 3 to 12 months.
Source: City of Berkeley, Landmarks Preservation Commission, checked Oct 18, 2026
A Berkeley permit can bring extra work: smoke detectors on any project valued at $1,000 or more and a Private Sewer Lateral Certificate at $60,000 or more. Projects under $166,157 can ask to cap accessibility upgrades at 20% of valuation.
Source: City of Berkeley, Permit Service Center, checked Oct 18, 2026
Berkeley requires a permit for all construction and most repairs unless specifically exempt, and you must apply before work starts, through Permits Online or by appointment at the Permit Service Center.
Source: City of Berkeley, Permit Service Center, checked Oct 18, 2026
What a addition job costs
Too few addition permits in Berkeley declare a value for us to publish a range. For an estimate by size and finish level, use the home construction cost calculator.
Planning an accessory dwelling unit? That has its own site: Bay Area ADU Builders.
B or B-2: which license fits your job
Both classes can act as your prime contractor. A B-2 is limited to remodels of an existing wood-frame house. If your plan changes the structure, look for a B.
| Job | B General Building | B-2 Residential Remodeling |
|---|---|---|
| Kitchen or bath remodel in an existing house | Yes | Yes, when the contract covers 3 or more unrelated trades |
| Addition or new rooms | Yes | No |
| Moving or removing a load-bearing wall | Yes | No |
| New home | Yes | No |
| Commercial or tenant work | Yes | No |
Sources: CSLB, class B and class B-2, checked Oct 18, 2026. More in B vs B-2.
California rules for your contract
A down payment on a home improvement contract can't be more than $1,000 or 10% of the price, whichever is less. No progress payment can be more than the work done or materials delivered.
Source: California B&P Code 7159.5, checked Oct 18, 2026
Work under $1,000 in total (labor and materials) that needs no building permit doesn't require a license. The exemption doesn't apply if the person advertises as a contractor, has employees, or splits a job to stay under the limit.
Source: California B&P Code 7048, checked Oct 18, 2026
Every licensed contractor must keep a $25,000 contractor's bond on file with CSLB. That has been the amount since January 1, 2023.
Source: CSLB, bond requirements, checked Oct 18, 2026
A contractor with employees must carry workers' comp. Until 2028, a B contractor with no employees can legally file an exemption, so check which one yours did. From January 1, 2028, a workers' comp certificate is required for every license.
Source: CSLB, workers' compensation, checked Oct 18, 2026
Complaint history isn't in CSLB's free data files, so we don't show it. Check complaints on CSLB before you sign.
Home addition contractors near Berkeley
Other project types in Berkeley
How this list is built
We have no city permit file for Berkeley yet, so a contractor is listed only if it confirmed addition work to us. A contractor is listed only with evidence for addition work: a permit record whose description matches, or a source the contractor gave us.
License class, status, dates, bond and workers' comp come from CSLB's public data files: Master file Oct 16, 2026, workers' comp file Oct 17, 2026, processed Oct 18, 2026. Each card links to that license's live CSLB record. Full method.