Full contractor vetting takes a couple hours across the full project cycle. But most homeowners don't have that time, and the initial filter decision — 'is this contractor worth even considering' — can be made much faster. The 15-minute vetting protocol below is the compressed version. It catches the majority of contractors who would produce bad outcomes. It's not comprehensive, but it's dramatically better than no vetting at all.
This guide is part of the Know Before You Hire series. At Home Services Co, we pass this screening transparently — it's designed to pass legitimate operators while filtering out the bad ones.
Five phone questions (5 minutes). When you call for an initial estimate or service request, ask these five questions. 1: 'What's your state license number, and can I verify it on the board website?' Legitimate contractors give the number immediately. Evasion is diagnostic. 2: 'What's your insurance carrier, and can you provide a COI within 24 hours?' Legitimate operators name a carrier they use regularly. 3: 'What's your typical hourly labor rate (or price per unit for standardized work)?' Legitimate contractors give a number. Refusal to price signals the flat-rate book upsell pattern. 4: 'Do you have recent customer references I can call?' Real contractors have recent references. 5: 'What's your policy on scope changes during the job?' A real answer describes a written change-order process. A vague answer signals potential scope-creep problems.
The call's pacing tells you. How the contractor's scheduler or owner handles these questions is itself diagnostic. Direct answers to direct questions is the good sign. Defensiveness, evasion, or pushback — 'well, you're asking a lot of questions' — is the contractor telling you their comfort zone is in less-informed customers. See 12 red flags.
Three online checks (5 minutes). Check 1: state license board verification. Use the license number from the phone call. Confirm status (active), classification (covers your work), and discipline history (clean or flagged). See verify license. Check 2: BBB rating and complaint history. Look at complaints specifically, not just the grade. Pattern of same-type complaints across multiple years is meaningful. Check 3: Google Reviews and secondary review platform (Yelp if available). Read recent negative reviews specifically. Patterns of complaints reveal reality. See reading reviews critically.
One reference call (5 minutes). Call one reference the contractor provided. Ask five questions: How long ago did they do your work? What was the scope? Did the project finish on time? Did the final invoice match the estimate? Would you hire them again for a bigger project? These five questions take 5 minutes with the reference and reveal more than 50 pages of marketing material. See the reference test.
Interpreting the results. If the contractor passes all three sections — the phone questions without evasion, the online checks without red flags, the reference call with positive specific answers — they're worth further consideration. If they fail any one section significantly, consider finding another option. Multiple failures across sections is a clear walk-away signal. The goal of the 15-minute screening is not to prove the contractor is great; it's to filter out the clearly problematic ones before you invest more time.
What this screening catches. Unlicensed operators. Contractors with major insurance gaps. Flat-rate-book pricing schemes. Contractors with significant complaint history. Contractors whose past customers won't vouch for them. Contractors who aren't comfortable with informed customers.
What this screening doesn't catch. Contractors who do adequate work on small jobs but fail on large ones. Contractors with specific weaknesses in one trade area despite broad competence. Contractors whose quality has slipped recently despite good older reviews. Contractors experiencing financial distress that will manifest as cash flow problems on your project. For these deeper concerns, the full vetting process applies — this 15-minute screening is the entry-level filter, not the full examination.
When to extend the screening. For larger projects (above ~$10,000), the 15-minute protocol should expand to: three reference calls instead of one, a visit to one in-progress or recently-completed project, a deeper conversation about the contractor's current workload and timing, and review of the draft contract before signing. Still under 2 hours total — but more thorough than the 15-minute filter.
The insurance COI follow-up. After passing the phone questions, request the COI in writing. Real COI within 24 hours is the pass. Delays, evasion, or a COI that doesn't match the claimed carrier when called is the fail. This check happens after the 15-minute screening but before signing.
Pattern across screenings. If you're getting quotes from three contractors, apply this protocol to all three. The comparison reveals meaningful differences. Contractor A passes cleanly, contractor B has marginal results, contractor C fails. The decision structure is obvious: A is in the running, B gets further investigation or drops, C is out. Price considerations apply only among the contractors who passed screening.
The time return on vetting. 15 minutes of screening time prevents a percentage of bad-outcome projects. On a $20,000 project, that's potentially a percentage of $20,000 in bad-outcome costs — sometimes the full amount, sometimes partial. The ROI on vetting time is among the highest of any consumer activity. The only reason most homeowners don't do it is underestimation of the benefit or overestimation of the difficulty.
Scaling up for multiple contractors. When getting three bids, the 15-minute screen per contractor = 45 minutes total for three. Still under an hour of your time for a significant project. Do the screenings in parallel (make the phone calls in a batch, do the online checks in a batch, make the reference calls in a batch). Batch processing is more efficient than doing full screening on each contractor sequentially.
When to skip the screening. For very small jobs ($100-$500 range) with a known local operator or a service provider you've used before, full screening isn't necessary. For any job above a thousand dollars or with a contractor you haven't worked with, do the screening. The threshold for 'skip the screening' should be low — the protocol exists precisely for lower-cost projects where people tend to rush.
The written-record approach. Take notes during the screening. License number, insurance carrier, hourly rate, reference names. The notes become part of your contractor file. If problems later emerge, the notes are evidence and reference. This is especially useful when comparing three contractors — the notes let you remember specifics about each.
The meta-screening. The 15-minute screening also reveals how the contractor interacts with informed customers. The ones who bristle at screening are the ones whose business model depends on uninformed customers. The ones who welcome screening are the ones whose business model works with informed customers. This meta-signal alone is often predictive of project experience quality.
The summary. 5 phone questions + 3 online checks + 1 reference call = 15 minutes of compressed vetting that catches most problematic contractors. Scale up for larger projects. Apply to all contractors you're considering. Take notes. The protocol's value is not perfection — it's preventing the worst-outcome contractor choices with minimal time investment.
At Home Services Co, we welcome this screening — our licensing, insurance, pricing, and references all verify quickly. Related: 12 red flags, verify license, verify insurance, reference test, pricing, book, or the full series.