Home addition contractors in Palo Alto, CA
No contractors are listed for addition work in Palo Alto 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 Palo Alto first. A new two-story house, or a second-floor addition of 150 sq ft or more, must meet every two-story objective design standard.
Source: City of Palo Alto, Current Planning, Oct 18, 2026
Home addition contractors in Palo Alto
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 Palo Alto 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 Palo Alto
Permits go through City of Palo Alto Development Services (Building). Put in the contract who pulls the permit.
A Palo Alto kitchen or bath remodel that stays inside the existing footprint with no structural change can get a same-day Instant Building Permit, for detached single-family homes and duplexes. Only licensed contractors with an Accela Citizen Access (ACA) account can use it, so owner-builders can't.
Source: City of Palo Alto, Planning & Development Services, checked Oct 18, 2026
Other permits are filed through Accela Citizen Access, and the city says your first response should come within 2 to 3 business days. Final inspections can only be booked by phone.
Source: City of Palo Alto, Planning & Development Services, checked Oct 18, 2026
If the house is more than 45 years old and a discretionary application proposes an addition, demolition or major exterior change, the city may require a Historic Resource Evaluation report. Interior work and normal maintenance usually skip historic review.
Source: City of Palo Alto, Historic Resources & Permit Review Requirements, checked Oct 18, 2026
What a addition job costs
Too few addition permits in Palo Alto 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 Palo Alto
Other project types in Palo Alto
How this list is built
We have no city permit file for Palo Alto 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.