Home addition contractors in Solano County, CA
No contractors are listed for addition work in Solano County 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 Solano County first. For a room addition, Planning Services sets the zoning setbacks before Building and Safety issues the permit, and the addition can't sit over the septic system or its reserved expansion area.
Source: Solano County Resource Management, Building & Safety Services, Oct 18, 2026
Home addition contractors in Solano County
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 Solano County 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 Solano County
Permits go through Solano County Department of Resource Management, Building & Safety Services Division. Put in the contract who pulls the permit.
Solano County takes building permit applications only online, through its Online Building Permits portal. You pay plan review fees when you submit and the rest when the permit is issued.
Source: Solano County Resource Management, Building & Safety Services, checked Oct 18, 2026
The county issues permits only to a licensed contractor, the property owner or the owner's certified agent, and it checks the contractor's license and workers' comp.
Source: Solano County Resource Management, Building & Safety Services, checked Oct 18, 2026
Fences are exempt only up to 6 ft in Solano County, and retaining walls up to 4 ft measured from the bottom of the footing unless they hold back a slope or structure.
Source: Solano County Resource Management, Building & Safety Services, checked Oct 18, 2026
Public facilities fees are waived for an ADU of 749 sq ft or less and prorated from 750 sq ft. A detached ADU of 1,200 sq ft or less may be exempt from fire sprinklers if it meets the county's other conditions.
Source: Solano County Resource Management, Building & Safety Services, checked Oct 18, 2026
What a addition job costs
Too few addition permits in Solano County 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 Solano County
Other project types in Solano County
How this list is built
We have no city permit file for Solano County 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.