California Auto Repair Estimate Requirements: What the BAR Expects From Your Shop

California auto repair estimate requirements, in short: before any work starts, a registered shop must give the customer an estimate and get the customer’s authorization. Extra work beyond that estimate needs fresh authorization before it is done. The final invoice must itemize parts and labour and show the shop’s registration number, and the records must be kept for at least three years. All of this comes from the Bureau of Automotive Repair (BAR) and the Automotive Repair Act.

Last reviewed October 31, 2026, against the BAR Write It Right page (updated January 2026) and the other sources listed below; some sources could not be opened automatically (see the note at the end). This is a practical summary, not legal advice. Confirm anything that affects you against the sources at the bottom.

The short-answer checklist

• Registration: a valid Automotive Repair Dealer (ARD) registration, with your license and ARD sign posted at the business.
• Written estimate: parts and labour priced for the specific job, given before work begins.
• Authorization: the customer approves in writing, orally or electronically before you start.
• Additional work: a revised estimate and a new authorization, documented, before you do it.
• Invoice: itemized, with your registration number, business name and address.
• Records: estimates, authorizations, work orders and invoices kept at least three years.

Who must register with the BAR, and what must a shop display?

California regulates automotive repair through the BAR. To operate as a repair dealer you need an ARD registration. The BAR’s licensing page tells licensees to post their license and the ARD sign at the business. The BAR’s page does not give the full display specification in that section, so read its signage page before you order a sign or reprint a certificate.

Two recent changes are worth putting on a calendar:

• Renewal data. Regulations that took effect April 1, 2024 require existing ARDs to tell the BAR about changes to their application information, and to give an email address. Mobile ARDs also provide a license plate number. See the BAR’s renewal write-up.
• Online advertising. Since October 1, 2025, internet-based advertising must show your registered firm name, your ARD number and the phone number the BAR has on file for that location, according to trade press (Aftermarket Matters, re-read October 31, 2026). The BAR said it would focus on education before other enforcement options. The same report says a tracking phone number that differs from the number on file with the BAR may be treated as misleading, so check call-tracking numbers on your website. If your website footer or Google listing has no ARD number, that is a ten-minute fix.

What are the California auto repair estimate requirements for estimates and authorization?

What the written estimate must contain

The core rule is in Business and Professions Code section 9884.9: the shop gives the customer a written estimated price for labour and parts for a specific job, and no work is done and no charges accrue before the customer authorizes it. Title 16 CCR section 3353 adds that each part in the estimate is treated as new unless it is identified as used, rebuilt or reconditioned.

From the BAR’s Write It Right quick-reference guide, a general estimate should include:

• A description of the specific job and the estimated price for parts and labour.
• Each part identified as new, used, rebuilt or reconditioned.
• Hazardous waste disposal costs as a separate item, with the EPA ID number where it applies.

The same guide has extra rules for special jobs. Collision estimates must itemize parts and labour separately and must use new OEM crash parts unless a part is identified as non-OEM. Teardown estimates must cover teardown and reassembly cost, any parts that will be destroyed, a warning that the unit may not be restorable, and a maximum reassembly time. Smog, transmission, windshield, air conditioning and insurer-paid work each have their own additions. If you do those jobs, read that section of the guide line by line.

The guide also says towing fees go on a separate document, not on the repair estimate or invoice.

How does customer authorization work in California?

The BAR accepts three forms (an estimate is not required for preventive maintenance that is free, or whose price is conspicuously displayed or made available to and acknowledged by the customer), as long as the approval comes before work starts. What you record depends on the form:

Form	What to record
Written	Customer signature and date
Oral	Date, time, name of the person who approved, phone number called
Electronic	Date, time, name of the person who approved, email address or phone number contacted

If the customer cannot bring the car in during business hours, you can still prepare the estimate, contact the customer by phone, email or text, and record the same details on both the estimate and the invoice.

What do you do when you find extra work during the job?

This is where most disputes start. Section 9884.9 says you cannot charge for work or parts above the estimate without the customer’s consent, obtained after you know the estimate is too low and before you do the extra work. The BAR’s guide spells out the steps:

1. Prepare a revised work order showing the added parts, added labour and the new total.
2. Contact the customer and give them those figures.
3. Record the authorization on the work order and on the invoice.

A customer can name another person to approve additional work, but the designation has to be documented at the first authorization, with the designee’s name and contact information, the customer’s signature, the date and the work order number. The designee cannot be the shop, an employee, an agent or the insurer.

For example, assuming a brake job estimated at $480 turns up seized rear calipers, the decision point is the moment you know. You call or text with the added parts, the added labour and the new total, you wait for the yes, and you log the time and the name. A tech who quietly fits the calipers because the car is already on the lift has done unauthorized work, even if the customer would have said yes.

What must a California repair invoice show, and how long are records kept?

What the invoice must show (CCR section 3356)

The BAR’s guide says the invoice is provided when all repairs are complete and must include:

• Your ARD registration number, business name and address.
• Itemized services and repairs with prices, including diagnosis, warranty work and no-charge work.
• Each part in common terms, with new, used, rebuilt or reconditioned status, and OEM or non-OEM where relevant.
• Subtotals for labour and parts, then sales tax, then the total.
• Hazardous waste fees with the EPA number.
• Replaced parts that cannot be returned to the customer, where that applies.
• For additional authorized work, the date, time, person, contact method, a description of the added work, the cost and the new total.

What to keep, and for how long

The BAR says to keep invoices, estimates, authorization records (including emails and texts), work orders and supplemental authorizations for at least three years, available for BAR inspection. Records for each transaction need a unique identifier that ties them together. If you store signed documents electronically, they need to be scanned with the signature.

What changed recently in California BAR guidance?

Date	Update	Source
April 1, 2024	ARD renewal rules: report application changes, give an email address	BAR
October 1, 2025	Internet advertising must show firm name, ARD number and phone number on file	Aftermarket Matters
January 7-8, 2026	BAR updated Write It Right: mobile repair invoices must include the repair location; teardown estimates describe the general area to be disassembled, with no itemized list of every part required; new guidance on two acceptable ways to estimate paint and materials	FenderBender, Repairer Driven News

The BAR’s page itself reads “Updated January 2026”. Check bar.ca.gov/wir before relying on this table, since guidance changes.

Copyable California estimate and invoice checklist

Estimate (before work starts)

• Shop name, ARD number, address, phone
• Customer name, vehicle, odometer, date and time
• Description of each job
• Parts priced one by one, each marked new, used, rebuilt or reconditioned (OEM or non-OEM for crash parts)
• Labour priced
• Hazardous waste fee and EPA ID, if applicable
• Total estimated price
• Customer authorization: signature and date, or the date, time, name and contact used
• Special-job disclosures (teardown, smog, collision, third-party payor), if applicable

Additional work (before you do it)

• Revised work order with added parts, labour and new total
• Customer contacted, with date, time, name and number or email used
• Approval noted on the work order

Invoice (at completion)

• ARD number, business name and address
• Every repair and diagnosis itemized with price
• Parts listed with status
• Labour subtotal, parts subtotal, tax, total
• Authorization details for any added work
• Record filed under one job identifier, kept at least three years

Do the rules differ between Los Angeles, San Diego, San Francisco and San Jose?

The Automotive Repair Act and BAR rules apply statewide. A shop in Los Angeles, San Diego, San Francisco or San Jose works under the same estimate and invoice rules. That is why this is one guide and not four near-identical city pages. Local differences, such as business licences, zoning and local taxes, are set by each city and are outside this page.

Other states and provinces differ, sometimes a lot. We will cover them only where we can check the primary sources. For Ontario, see Ontario auto repair estimate rules for GTA shops.

Can shop management software help with BAR compliance?

None of the rules above need software. A signed carbon copy works. But the rules are mostly about proof: who approved what, when, and for how much. Records that are typed in, timestamped and searchable are easier to produce than a drawer of paper in a BAR inspection.

Mecano Shop is a shop management system with a board, estimates, inspections, texting and pay links. Used well, texting an estimate and keeping the customer’s reply attached to the job can give you a dated record of approval. We do not claim that Mecano makes a shop BAR-compliant. Compliance depends on what your estimates say and how your team follows the steps. Check any software, ours included, against the Write It Right checklist before you rely on it. If you are comparing options, start with how to choose auto repair shop management software. To turn an inspection into an approved estimate line, see digital vehicle inspection: from findings to approved work.

Not legal advice

This page summarizes public BAR guidance and statute for shop owners and managers. It is not legal advice, and regulations change. Last verified October 31, 2026. For the current text, use the sources below and the official California legislative site. A note on method: we re-checked the BAR’s Write It Right page, licensing page and the trade-press advertising report on October 31, 2026. We also confirmed on that date that the Write It Right page cites the underlying rules as BPC section 9884.9 and CCR sections 3353, 3353.1, 3354, 3356, 3358 and 3355, and that 16 CCR 3353 (Cornell LII) says each part in an estimate is new unless identified as used, rebuilt or reconditioned. The Justia statute page, the Repairer Driven News article, the BAR PDF guide and the legislative site returned errors or blocked automated access, so statute wording there is as the BAR page summarizes it. Read the statute text directly before relying on exact wording.

Related reading

• Arizona Auto Repair Laws (and Georgia): What Shops Must Follow
• Florida Motor Vehicle Repair Act: registration, the written-estimate rule and invoices
• Illinois Automotive Repair Act: Estimate and Invoice Rules
• Mecano Shop facts: plans, features and limits

Sources

• BAR, Write It Right
• BAR, A Consumer’s Guide to Auto Repair (PDF, customer-facing)
• BAR, How to get licensed
• BAR, Registration renewal requirements for ARDs
• Repairer Driven News, Jan 8, 2026
• FenderBender, Jan 7, 2026
• Aftermarket Matters, advertising regulations
• Business and Professions Code 9884.9
• 16 CCR 3353
• California Legislative Information