7 Myths About General Contractors That Cost Homeowners Thousands

July 15, 2026 · Tips · 5 min read

General contractors are one of the most misunderstood professionals homeowners hire. The myths surrounding them — about bids, markups, permits, and warranties — directly drive bad decisions: hiring the wrong contractor, structuring payments incorrectly, skipping permits, or assuming protections that don't exist. Here's what's actually true about the most costly misconceptions.

Myth 1: The Lowest Bid Wins

Collecting multiple bids is the right move. Automatically choosing the lowest is not. A bid that comes in 20–30% below the others isn't more competitive — it's almost always wrong. The low bidder has either excluded scope (items you think are included but aren't), underpriced labor they'll recover through change orders, or is planning to cut material quality mid-project.

Based on contractor profiles in our directory, the most common post-project disputes involve exactly this pattern: the homeowner chose the low bid, the project started smoothly, and change orders began arriving in week three. By the time the project finished, the final cost exceeded the second-lowest bid by a significant margin.

A better approach: get three to four bids, throw out the obvious outlier, and compare the middle bids line by line. Our guide to vetting a general contractor has a section on reading bids comparatively — scope alignment matters more than the bottom number.

Myth 2: Licensed Means Permitted

These are separate things. A contractor can be fully licensed by the state and still choose not to pull permits on your project. Licensing certifies that the individual or company has met certain training and testing requirements. Pulling permits is a project-specific obligation under local building codes.

The distinction matters because if a contractor skips permits, you are the one who faces consequences: fines from the municipality, required demolition and reconstruction, and complications at resale when unpermitted work shows up on a home inspection. Always include a clause in your contract stating that the contractor is responsible for identifying and obtaining all required permits before work begins.

Myth 3: A Signed Contract Means You're Fully Protected

A contract is only as strong as what's written in it. Many homeowners assume a signed contract provides blanket protection against cost overruns, delays, and defects. It doesn't — unless those protections are explicitly spelled out.

A strong contract includes: a detailed scope of work listing every item by description and quantity, a payment schedule tied to milestones not calendar dates, a change order process requiring written approval before any additional work begins, a dispute resolution clause specifying mediation or arbitration, and a workmanship warranty. Without these provisions, you're relying on state default rules, which favor contractors more than homeowners in most jurisdictions.

Myth 4: Contractors Mark Up Materials to Profit Off You

The material markup myth — that GCs secretly inflate material costs at your expense — is widespread and mostly wrong. The standard markup of 15–30% on materials covers real costs: sourcing, managing deliveries and returns, carrying materials before they're billed, coordinating with suppliers, and absorbing price fluctuations between estimate and purchase.

What you should watch for isn't the existence of a markup but whether the final price is competitive. Our guide on contractor markups on materials shows what's standard versus what signals price-gouging. Cost-plus contracts with open books offer more transparency but shift some risk to you.

Myth 5: You Save Money by Hiring Subcontractors Directly

Some homeowners try to cut the GC out by contracting directly with the electrician, plumber, and framer separately. In theory, you eliminate overhead and profit margin. In practice, you become the project manager — and that job is harder than it looks.

General contractors earn their margin by sequencing trades, resolving conflicts between subcontractors, ensuring one trade's work doesn't force another to redo theirs, and managing inspections. When homeowners coordinate directly, the most common outcomes are scheduling gaps, cost overruns from rework, and no single accountable party when something goes wrong. Multi-trade renovations almost always benefit from GC coordination that exceeds the fee.

Myth 6: A 50% Upfront Deposit Is Standard

Legitimate general contractors do not require 50% of the total project cost before work begins. The industry norm for residential projects is 10–15% upfront to secure the project and cover initial material deposits, with subsequent payments tied to verifiable milestones: framing complete, rough-in inspection passed, drywall finished, and so on.

A demand for a large upfront payment — particularly 30% or more — is one of the clearest warning signs in the industry. Once that money is paid, your leverage disappears entirely. Our guide to red flags when hiring a contractor covers this and nine other warning signs that are easy to miss when you're eager to get a project started.

Myth 7: Verbal Agreements Are Fine for Small Changes

"He said he'd include the trim for free." "We agreed she'd fix that ceiling crack at no charge." These are exactly the claims that end up in contractor dispute forums — and they're almost impossible to enforce without documentation.

Every change to scope, cost, or timeline should have a written change order signed by both parties before the work happens. A text message thread can sometimes serve as documentation in small claims, but a signed change order is unambiguous. Contractors who resist this process are telling you something important about how they'll behave if a larger dispute arises.

The Common Thread

Every myth on this list shares a root cause: most homeowners hire contractors infrequently — once every several years — while contractors do this every day. The information asymmetry is real, and the myths above are where it shows up most consistently. Closing that gap means reading contracts before you're excited about a project, asking specific questions rather than making assumptions, and verifying credentials rather than taking them on faith.

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