Red Flags When Hiring a Contractor in 2026: 12 Warning Signs Before You Sign

What Are the Biggest Red Flags When Hiring a Contractor?

The biggest red flags are: no valid CSLB license, a bid that is 30%+ below the others, cash-only payment demands, no written contract, and pressure to start immediately without permits. Any one of these can cost you tens of thousands of dollars.

As a licensed GC who has completed hundreds of remodels, I can tell you that most homeowner horror stories share the same warning signs. The homeowner saw them and rationalized them away. Do not do that. This post gives you every flag I know, with the numbers to back them up.

How Do I Know If My Contractor Is Actually Licensed in California in 2026?

Go to cslb.ca.gov right now and look up their license number. Takes 30 seconds. If they cannot give you a license number before the conversation goes further, walk away.

Here is what the CSLB lookup tells you: license status (active or not), bond amount (California requires a $25,000 contractor bond), workers compensation insurance status, and any disciplinary actions or prior violations. A license number on a business card means nothing. The status on CSLB is what matters.

In my experience building homes across Silicon Valley since 2017, I have seen contractors with suspended licenses actively bidding on $500K+ projects. The homeowner had no idea. One check on cslb.ca.gov would have saved them everything.

The Opsite homeowners platform has a free CSLB license checker that pulls live data including bond status, workers comp status, and any disciplinary history in one view. You do not have to navigate the CSLB site manually.

Specific red flags to check on CSLB:

• License status listed as "Suspended," "Revoked," or "Expired"
• Bond listed as "Not on File" (means they are not bonded)
• Workers compensation listed as "Exempt" when they have employees (a major liability risk for you)
• Any disciplinary actions in the last 5 years

According to CSLB complaint data, unlicensed contractors are responsible for a disproportionate share of consumer complaints - and when something goes wrong with an unlicensed contractor, you have almost no legal recourse and your homeowners insurance may not cover the damage.

What Red Flags Show Up in a Contractor's Bid or Estimate in 2026?

The clearest bid red flags: one bid is 30% or more below the other two, vague line items like "labor" with no breakdown, and a suspiciously low allowance for materials. These almost always mean change orders are coming.

Get three bids minimum. Not two, not one. Three. And if the lowest bid is 30% or more below the others, that is not a deal. That is a contractor who underbid to win the job and will hit you with change orders once you are locked in. Based on typical project data from Bay Area contractors, a kitchen remodel that should cost $75,000-$120,000 does not get done properly for $45,000. If someone bids $45,000, they are either planning to cut corners on materials, use unlicensed subcontractors, or load change orders until they get to the real number.

From working with homeowners on projects ranging from $50K to $2M+, I have seen this pattern dozens of times. The low bidder wins the job. Six weeks in, the homeowner is 40% over budget and the contractor is in control because the project is half-demolished.

Bid red flags to look for:

• No itemized breakdown - just one lump sum
• Material allowances that are obviously too low (e.g., $2,000 for tile in a full bathroom renovation)
• No mention of permit costs
• No specification of brand, grade, or model for appliances and fixtures
• The bid is a verbal quote, not a written document

A legitimate contractor's bid should specify every line item: demo, framing, rough plumbing, rough electrical, insulation, drywall, tile, cabinets, fixtures, permits, and cleanup. If you cannot see exactly where the money goes, you cannot compare bids fairly.

The free estimate comparison tool on Opsite lets you upload two or three bids side by side and flags missing line items and outlier numbers instantly.

What Contract Red Flags Should I Watch For Before Signing?

The biggest contract red flags: no payment schedule tied to milestones, a deposit request over 10% (California law caps deposits at 10% or $1,000, whichever is less, for most projects), no change order clause, and no lien waiver requirement. Any of these can expose you to serious financial loss.

California law is clear on deposits. Under Business and Professions Code Section 7159, the maximum allowable down payment for a home improvement contract is 10% of the total contract price or $1,000, whichever is less. If a contractor asks for 20%, 30%, or 50% upfront, that is illegal and it is a red flag that they are either undercapitalized or planning to disappear.

A draw schedule tied to construction milestones is how legitimate projects get paid. Typical structure looks like this:

That last payment, called retention or retainage, is your leverage. Hold it until the punch list is signed off and the final inspection passes. Never release it early.

As a contractor, I can tell you that any GC worth hiring will not flinch at a payment schedule tied to milestones. The contractors who push back on retention are the ones who know they will leave something unfinished.

The Opsite AI contract review reads your actual construction contract and flags high-risk clauses, missing lien waiver requirements, problematic payment terms, and one-sided dispute resolution language. Based on 2026 construction cost data, homeowners who skip contract review are 3-4x more likely to face cost disputes.

For a deeper look at payment schedules, read what is a draw schedule and how does it protect you.

What Red Flags Show Up During the Construction Job?

The biggest during-construction red flags: work starting without a permit, subcontractors you have never heard of showing up unannounced, your GC going more than 48 hours without returning a message, and change order requests that seem to multiply every week.

Permits are not optional. They protect you. A building permit triggers inspections - an independent check by the local building department that the work is code-compliant. Work done without permits is unpermitted work. When you sell the house, you may have to tear it out or retroactively permit it at your cost. Your homeowners insurance may not cover an unpermitted addition. The contractor saves $500-$2,000 in permit fees. You absorb the risk forever.

If your GC takes 48 hours or more to return a text, that is a red flag. Communication problems during construction almost always get worse, not better. By the time you are frustrated enough to notice the pattern, the job is usually 30-40% complete and changing contractors gets complicated fast.

Change orders deserve their own category. A single change order is normal. Two to three on a large project is not unusual. Five or more change orders, each under $5,000, is a pattern. It often means the original bid was deliberately low to win the job, and the contractor is now working back to the real number in small increments that feel hard to dispute individually. Based on industry data, homeowners who receive 5+ change orders end up paying an average of 22-35% more than the original contract price.

The Opsite Change Order Analyzer lets you upload a change order PDF and runs it against your original contract scope, checks line-item pricing against California market rates, and tells you whether the change order is legitimate, in-scope, padded, or unclear - and writes you a negotiation email if needed.

How Do I Run a Proper Background Check on a Contractor Before Hiring?

A real contractor background check goes beyond the CSLB lookup. It includes permit history (how many jobs have they actually completed under permit?), inspection pass rates, court records, online reviews across multiple platforms, and years in business. You need all of it before you hand over any money.

Here is what a proper contractor background check looks like in 2026:

• CSLB verification - license active, bond on file, workers comp active, no disciplinary actions
• Permit history - look up permits pulled under their license number. A contractor who has pulled 50+ permits has a track record. A contractor who has pulled 3 permits in 5 years is effectively new no matter what they tell you about their experience.
• Inspection pass rate - failed inspections mean code violations. Some contractors fail inspections routinely and use correction time as a lever to slow projects.
• Business age - how long have they been operating under this license? Many contractors close their LLC after a bad project and open a new entity. Check when the current business started, not when they "started in construction."
• Court records - have they been sued by homeowners? Mechanic's lien filings against past clients are public record and tell you a lot.

Based on typical project data from Bay Area contractors, the contractors with the highest complaint rates tend to have fewer than 20 permitted projects in their history, regardless of how many years they claim to have been in business.

The Opsite Pro Report ($49) automates this entire process. You enter the contractor names and their license numbers, and the AI pulls live CSLB data, Shovels permit history (total permits, inspection pass rate, average job value, project specialty mix), aggregated review data, and court records, then ranks your contractors and gives you a recommendation with specific red flags noted. It is the same background check I would do manually as a GC, done in minutes.

Frequently Asked Questions

How long does a CSLB license verification take?

About 30 seconds at cslb.ca.gov. Enter the license number or business name and you immediately see status, bond, workers comp, and any disciplinary history. The Opsite free CSLB checker pulls the same live data in one place at homeowners.useopsite.com/check.

What is the legal deposit limit for a contractor in California in 2026?

California law caps the down payment at 10% of the total contract price or $1,000, whichever is less, for most home improvement contracts. If a contractor asks for more than this upfront, that is illegal and a significant red flag. Do not pay it.

Can a contractor legally start work without a permit?

No. Work requiring a building permit must be permitted before construction begins. A contractor who starts without pulling permits is either cutting corners to save time and money, or they cannot get a permit because the work does not meet code. Either way, you absorb the risk as the property owner.

What does it mean if a contractor wants to be paid in cash only?

It almost always means they are operating off the books - not paying taxes, not carrying proper insurance, or both. It is a major red flag. Legitimate contractors accept checks or ACH transfers and provide written receipts. Cash payments also eliminate your paper trail in a dispute.

How many bids should I get before hiring a contractor?

Three minimum. Not two, not one. Three bids give you a real range and let you identify outliers in both directions. If one bid is 30% or more below the other two, that is not a deal - that is a setup for change orders.

What should I do if my contractor goes silent mid-project?

Send a written notice (email or text with read receipt) demanding a response within 48 hours. Document everything. If no response, contact CSLB to file a complaint. You may also want to speak with a construction attorney before making any additional payments. Do not release any remaining funds.

What is a lien waiver and why does it matter?

A mechanic's lien allows contractors and subcontractors to place a claim against your property if they are not paid. A lien waiver is a document the contractor signs releasing that right in exchange for payment. Always get a lien waiver from the general contractor and all subcontractors before making each progress payment. Without them, a subcontractor your GC failed to pay can put a lien on your house - even though you paid the GC in full.

Is it a red flag if a contractor does not have a physical business address?

Yes. A contractor who operates only out of a truck or a PO box is much harder to hold accountable if something goes wrong. A legitimate general contractor should have a verifiable business address that matches their CSLB registration. Look it up.