Quick answer: a low bid can look like a bargain because it leaves things out. I could not verify statistics on how often this happens, so this post gives none. It gives a way to compare bids line by line and a set of protections from California’s contractor board, whose consumer guide is specific and easy to copy into your own checklist. Rules differ by state, so treat the California details as an example of what good protection looks like.
Contents
What Can Be Missing From a Bid
These are gaps worth asking about (my checklist, not statistics):
- Demo and haul-away. One bid lists them together, another lists demo only; ask who removes the debris.
- Permits and code work. Ask whether permits, inspections and any required upgrades are priced.
- Material grade. A material category without a grade or brand leaves room for a cheaper version.
- Allowances. A line like “flooring allowance: $3,000” may not cover what you actually choose.
- Cleanup and finishing. Confirm these are written into the scope.
None of these require a false statement. A bid can be accurate for what it describes while describing less than you assumed, so ask what is explicitly excluded, in writing.
Write the Scope Precisely
The CSLB consumer guide recommends that the contract list the work description, price, payment schedule, who pulls permits, start and end dates, and the contractor’s license number, address and phone numbers. It also says to specify materials precisely, including brand, model and color, and it contrasts “Install maple kitchen cabinets” with a detailed version, while vague wording such as “Install some cabinets” or “Paint the entry” is a signal that the contract may not protect you. Include cleanup, debris removal and special requests, such as keeping lumber or appliances.
That list works as a template for your side of the comparison too: ask every contractor to answer the same items, and the gaps in each bid show up on their own.
Protect Your Payments
- Down payment. California’s limit is $1,000 or 10 percent of the contract price, whichever is less, with an exception for licensees with blanket performance and payment bonds (CSLB consumer guide).
- Payment schedule. The contract must show each payment amount and the work, materials or services it covers, and payments cannot exceed the value of the performed work (CSLB consumer guide).
- Change orders. If the contract price needs to change, it must be done with a written change order that becomes part of the contract; keep them with your project paperwork and have both parties sign (CSLB consumer guide).
- Right to cancel. The guide says you have three business days to cancel, or five if you are 65 or older, with written notice and no penalty, and the contractor must refund payments within 10 days. The right does not apply if the contract was negotiated at the contractor’s place of business (CSLB consumer guide).
Permits, Liens and Insurance
- Permits. The guide says permits are typically required for major work such as new construction, major renovations, HVAC repairs, water heaters and pools. Confirm before work starts whether you or the contractor will pull them and whether the fees are in the price.
- Mechanics liens. Even if you pay the contractor in full, unpaid subcontractors or suppliers may still file a lien. The guide suggests getting a list of subcontractors and suppliers with their start and finish dates, having subcontractors sign lien releases when their portion is done, and considering joint checks payable to both the contractor and the subcontractor or supplier.
- Insurance. Workers’ compensation insurance is required if the contractor has employees, and you can verify the policy on the CSLB website. General liability insurance is not required but is recommended, so ask whether the contractor carries it.
- Warranties. Get any contractor warranty in writing, including what it covers and how long it lasts, and request manufacturer warranties.
How to Compare Bids Side by Side
Get at least three bids so outliers stand out (my suggestion). Line the scopes up category by category: demo, materials, labor, permits, cleanup. Where one bid is silent on a category, ask about it. If you want AI help lining things up, this prompt is my suggestion:
Below are three contractor bids for the same project, copied exactly, with personal details removed.
[paste bid A]
[paste bid B]
[paste bid C]
Please make a table with one row per item and one column per bid. The items are: demo and haul-away, permits and inspections, materials with brand and grade, allowances, labor, cleanup, payment schedule, down payment, and warranty.
Then list the questions I should ask each contractor about every NOT STATED cell.
Rules:
- Use only what is written in the bids.
- Where a bid does not mention an item, write NOT STATED.
- Do not recommend a contractor or say which bid is best.The NOT STATED cells become your questions, and the answers go into a written change to the bid or the contract.
An invented example. Say bid A is $24,000 and covers demo with haul-away and permits, bid B is $21,500 and covers demo only, and bid C is $18,900 and does not mention permits, cleanup or a material grade. The gap between A and C is 24,000 minus 18,900, or $5,100, and 5,100 divided by 24,000 is about 21%. The table would show NOT STATED in the permits, cleanup and grade cells for C, and in the haul-away cell for B, and the question list would start there.
Now suppose C asks for $5,000 up front. Under the California rule described above, the limit is the lesser of $1,000 and 10 percent of the price, and 10 percent of $18,900 is $1,890, so the limit is $1,000 and the request is $4,000 over it. California is the example here, and other states set their own limits. The bids and amounts are made up.
Verify the Contractor
- Check the license status with your state board. In California, that is the Contractors State License Board at cslb.ca.gov (CSLB consumer guide).
- The guide advises getting at least three local references, calling them, and personally viewing the contractor’s completed work.
- Confirm the license is active and covers the trade you are hiring for.
- If work turns out faulty, the guide says you have four years to file a complaint with CSLB.
A Few Warning Signs Worth Pausing On
- A bid far below all the others is worth asking about rather than assuming it is a scam.
- Pressure to sign quickly. The guide’s advice is not to sign anything until you understand the contract and agree to the terms.
- A promise made verbally that does not appear in the written contract.
- Being asked to pay in advance. The guide says to pay only as work is completed.
What the FTC Adds to the California Rules
Because contractor rules differ by state, it helps to see what a national source says. The FTC’s guide to avoiding home improvement scams agrees with the California guide on the main points and adds a few of its own:
- Licensed and insured. Hire only licensed and insured contractors, verify the license with your state or county, and ask for proof of insurance.
- Check complaints. Check with the local Home Builders Association and consumer protection officials for complaints, and search the company’s name online with terms like scam, review or complaint.
- Written estimates. Get multiple estimates that describe the work, materials, completion date and price.
- A written contract, even if your state does not require one, with the contractor’s name, address, phone number and license number, plus estimated start and completion dates. Put any verbal promises about scope and costs in writing, and do not sign with blank spaces.
- Payment. Do not pay the full cost up front, and do not make the final payment until the work is finished and you are satisfied. The FTC notes that some states limit how much a contractor can require as a down payment but gives no percentage, so the state rule is the one that sets the number.
- Financing. Compare loan terms from other lenders before accepting financing from your contractor.
On cancelling, the FTC says that if you sign at home or somewhere other than the seller’s permanent business location, you can cancel “within three business days,” and the contract should include a written statement of that right. The FTC’s Cooling-Off Rule page describes the rule as covering door-to-door sales valued at more than $25, with sellers required to give disclosures about the right to cancel. This matches the three-business-day period in the California guide, and the California guide’s longer five-day period for people 65 or older is a state protection on top of it.
The good news from these sources is that the core protections are consistent across them: a written scope, a payment schedule tied to completed work, and a right to cancel. If you carry those three into every conversation, you are covered by the same ideas whether you live in California or elsewhere.
Send One Written Question to the Lowest Bidder
The FTC gives a short rule for the moment when one bid is far below the rest: do not automatically pick the lowest bid, and ask for an explanation if the estimates differ widely. A written question is the easiest way to do that, because the answer becomes part of the record. This template is my suggestion and uses only items from the sources above:
Hello [name],
Thank you for your bid of [amount] for [project]. I am comparing it with other bids, and I would like to understand the differences. Please confirm in writing whether your price includes each of the following, and if not, what each would cost:
1. Demolition and haul-away of debris
2. Permits and inspections
3. The brand, model and grade of each material
4. Cleanup at the end of the job
5. Any allowances, and what they cover
Please also send your license number, proof of insurance, and a written payment schedule.
Thank you,
[my name]An invented example. Using the bids from the comparison section, A is $24,000, B is $21,500 and C is $18,900. The gap between B and C is 21,500 − 18,900 = $2,600, which is 2,600 ÷ 21,500, about 12% of B. Because C is the widest outlier, it is the one to send the template to first.
If C answers that permits, cleanup and a named material grade are all included in writing, the written answer shows what the lower price covers, and you can compare it line by line with the others. If C answers that they are not included, you now know what the gap contains. The bids are made up.
Either outcome is useful, because you leave with facts instead of a guess, and the written answer protects you under the same “put it in writing” advice that both the FTC and California give.
My View on Contractor Bids
This closing part is my opinion. Every contractor writes bids for a living, so comparing several against each other beats trusting any one. An AI tool can help line up the scopes, but the final judgment about what is missing should be yours.
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