How to Vet a General Contractor: The Ultimate Checklist

Your fix-and-flip profit is made or lost during the renovation. The person steering that ship is your general contractor (GC). A great GC acts as your partner, navigating supply chains, managing crews, and executing your vision on schedule and within budget. A bad one can single-handedly turn a profitable project into a financial disaster through delays, shoddy workmanship, and budget overruns.

Finding a reliable general contractor is the single most critical task you'll undertake after closing on a property. Your deal analysis, financing, and market timing are all rendered moot if the rehab goes off the rails. You cannot afford to get this decision wrong. Too many new investors, eager to start demolition, rush this step and pay dearly for it.

This guide provides a comprehensive checklist for finding, vetting, and hiring the right general contractor. It’s not about finding the cheapest option; it’s about identifying the most qualified and trustworthy partner who can deliver a high-quality product that maximizes your return on investment.

Where do you find qualified general contractors?

Begin your search by tapping into your local real estate investor network. Ask for referrals from other flippers, buy-and-hold investors, hard money lenders, and investor-savvy real estate agents who have direct experience with residential renovations. These sources have a vested interest in recommending quality professionals and can offer firsthand accounts of a contractor's performance.

Beyond personal referrals, visit local lumberyards and building supply stores—not big-box retailers—and ask the managers at the pro desk who they recommend. They know which contractors are busy, pay their bills on time, and have established, professional operations. Finally, consider looking up local chapters of professional organizations like the National Association of the Remodeling Industry (NARI) or the National Association of Home Builders (NAHB). Membership often requires adherence to a code of ethics and continuing education.

Can you find a contractor online?

You can use online platforms like Houzz or Angi to generate a list of potential candidates, but you must treat this as a starting point only. Online profiles and reviews are easily manipulated and should not be your primary vetting tool. Use these sites to gather names and see examples of past work, then immediately move the vetting process offline using the steps outlined in this guide. Never hire a contractor based solely on an online profile or a handful of positive reviews.

How do you verify a contractor's credentials?

You verify a contractor's credentials by first requesting their full legal business name and state license number. Then, visit your state's contractor licensing board website and use their public search tool to confirm that the license is active, in good standing, and free of disciplinary actions. While you're there, confirm the name on the license matches the business name they provided and that they are licensed for the type and scale of work you require.

Next, ask for a Certificate of Insurance (COI) directly from their insurance agent. Do not accept a copy from the contractor, as it could be outdated or fraudulent. The certificate should list you as a certificate holder, which means you will be notified if their policy is canceled. This simple step is non-negotiable and protects you from immense liability.

What insurance coverage is necessary?

A general contractor must carry both general liability insurance and workers' compensation insurance. For general liability, look for a minimum coverage of $1 million per occurrence and a $2 million aggregate limit, which protects against property damage and third-party injuries. They must also have a workers' compensation policy that covers all their direct employees and any subcontractors they bring onto your job site. Without workers' comp, you could be held personally liable for any injuries that occur during the renovation, a risk that could bankrupt you.

What questions should you ask a contractor's references?

When calling a contractor's references, ask specific, probing questions about their project's financial and operational outcomes. Go beyond "Were you happy?" and ask: "Did the project finish on budget? If not, by how much did it go over, and why?" and "Did the project finish on time? If not, what caused the delays?" Other critical questions include asking about the quality of communication, how change orders were handled, and whether the final punch list was completed promptly. Crucially, ask if they would hire that contractor again for their next project.

How do you spot a fake reference?

A fake reference often gives vague, generic answers and struggles to recall specific details about the project. Ask for the property address, the approximate start and end dates, and the total renovation cost. If they are evasive or can't provide these details, it's a major red flag. Another warning sign is overly effusive praise with no mention of even minor, common challenges. Every construction project has small hiccups; a real client will be able to describe one and how the contractor resolved it.

How do you compare bids from different contractors?

To effectively compare bids, you must provide each of the 3-5 contractors you invite to bid with an identical, highly detailed scope of work (SOW). Your SOW should specify everything from the exact model of kitchen faucet to the type and thickness of LVP flooring. With a detailed SOW, you can compare the bids on an apples-to-apples basis, looking at the itemized cost breakdown for labor and materials in each category (e.g., electrical, plumbing, drywall, paint). A lump-sum bid without a detailed breakdown is an immediate disqualification.

Before you even get to this stage, you should have already run your initial numbers through a deal analyzer to ensure the project's profit potential justifies a full-scale renovation. If the After Repair Value (ARV) doesn't support the likely rehab costs in your area, you shouldn't be wasting contractors' time.

What does a good bid look like?

A professional bid is a detailed document, not a one-page estimate. It should be broken down by area (kitchen, master bath, exterior) and by trade (demolition, plumbing, electrical, HVAC, etc.), with separate line items for materials and labor. It will include specific quantities, material allowances for finish items (like tile or light fixtures), a proposed payment schedule, and an estimated project timeline. Ambiguity is your enemy; a detailed bid removes ambiguity and forms the foundation of your contract.

Consider this comparison for a hypothetical 1,500 sq ft flip in a market like Tampa, FL:

Contractor A's bid is an instant rejection. The lump-sum figures and missing GC fee suggest they are inexperienced or hiding costs. Contractor B provides a realistic, detailed bid that allows for negotiation and clear expectations. Contractor C is likely geared toward high-end custom homes, not profitable flips.

How much does a good general contractor cost?

A general contractor's services typically cost between 10% and 20% of the total, direct construction costs. This fee, often listed as a line item for "overhead and profit," covers their project management, insurance, administrative time, and margin. For a $70,000 renovation, you can expect a GC fee between $7,000 and $14,000.

This fee is added on top of the hard costs of materials and subcontractor labor. It's the price you pay for having a single point of responsibility who orchestrates the entire complex process. Trying to avoid this fee by hiring individual trades yourself is a common mistake for new investors and often leads to chaos, delays, and higher costs in the long run. The costs of labor and materials vary significantly across different real estate markets, so this fee structure allows for flexibility while ensuring the GC is fairly compensated.

Is the cheapest contractor the best choice?

No, the cheapest contractor is almost never the best choice and often becomes the most expensive one in the end. An unusually low bid—one that is more than 15-20% below the median of other detailed bids—is a massive red flag indicating the contractor may be uninsured, using subpar materials, or planning to submit multiple expensive change orders once the project has started. They may have also misunderstood the scope of work, leading to disputes and delays.

For example, imagine a flip in Phoenix, AZ. You purchase a property for $350,000, and your ARV is $500,000. Following the 70% Rule, your maximum allowable offer would suggest a budget for all costs, including rehab, of around $350,000. Let's say you budget $80,000 for the rehab. You get three bids: $65,000, $78,000, and $82,000. The $65,000 bid is tempting, but the contractor is vague on details. You choose them to save money. Three weeks in, they demand an extra $10,000 for "unforeseen electrical issues" not in the contract. Their tile work is sloppy and needs to be redone for $5,000. The project takes 16 weeks instead of the promised 10, costing you an extra $4,000 in holding costs. Your "cheaper" $65,000 contractor has now cost you $84,000, and the finish quality is still lower than what the $78,000 contractor would have delivered.

What should be included in a contractor agreement?

A detailed, legally reviewed contract is your ultimate protection and the blueprint for a successful project. It must contain the full, itemized scope of work and the final bid as an attachment, a fixed price for that scope, and a detailed payment schedule based on verifiable completion milestones (e.g., 10% upon completion of demolition, 20% upon passing framing inspection), not arbitrary dates. It should also include a clear project timeline with a start and end date, a "time is of the essence" clause, and a procedure for handling change orders in writing. Finally, ensure it outlines lien waiver procedures, warranty information (typically one year on workmanship), and a dispute resolution process.

Using a generic, one-page contract is an invitation for disaster. It's wise to have an attorney who specializes in construction law review your contract before signing, especially on your first few deals. For example, a solid contract for that Phoenix flip would have required the GC to provide unconditional lien waivers from all subcontractors before receiving a draw payment. This prevents a drywall sub from putting a lien on your property because the GC didn't pay them, even though you paid the GC. This single clause can save a deal from collapsing under legal and financial pressure.

Frequently asked questions

What's the difference between a general contractor and a subcontractor?

A general contractor is responsible for the overall management and execution of the entire construction project. They hire, schedule, and oversee individual specialists known as subcontractors (e.g., plumbers, electricians, painters) to perform specific portions of the work.

Can I be my own general contractor?

While technically possible, acting as your own GC on a fix-and-flip is highly inadvisable unless you have a professional background in construction management. It requires significant time, expertise, a network of reliable subcontractors, and a deep understanding of local building codes and permitting processes. Mistakes can lead to costly delays, failed inspections, and a lower-quality finish, eroding your profits.

How are payments (draws) typically structured?

Payments, or draws, should always be tied to the completion of specific, verifiable project milestones, not dates on a calendar. A typical structure might be: 10% on contract signing (if required by state law), 20% after passing framing and rough-in inspections, 30% after drywall and paint, 30% after final finishes (flooring, fixtures, cabinets), and the final 10% upon completion of the final punch list and receipt of all lien waivers.

What is a change order?

A change order is a written document that modifies the original contract's scope of work. It should detail the new work to be done, the additional cost (or credit), and any change to the project schedule. All change orders must be signed by both you and the contractor before any additional work begins to prevent misunderstandings and budget overruns.

What is a mechanic's lien?

A mechanic's lien is a legal claim placed on your property by a contractor, subcontractor, or supplier who has not been paid for labor or materials they provided. A valid lien can prevent you from selling or refinancing the property until the debt is settled. Your contract should require the GC to provide lien waivers from themselves and all subs/suppliers as a condition of final payment.

The Bottom Line

The process of vetting a general contractor is rigorous for a reason. This person will control the largest variable expense in your fix-and-flip project and will have a direct impact on your timeline, product quality, and ultimate profitability. Rushing this process or choosing based on the lowest price is the most common and costly mistake a real estate investor can make. Take the time to conduct thorough due diligence. By following this checklist, you aren't just hiring a contractor; you are selecting a critical business partner who can help you consistently execute profitable renovations.