An owner-builder affidavit is a sworn, notarized statement that lets you, as the property owner, pull building permits and run a construction project on your own home without hiring a licensed general contractor. Sign it and you step into the contractor’s shoes for that job: code compliance, worker supervision, inspections, insurance, and liability all become yours. States allow the exemption because you have the right to improve property you own and live in, but the paperwork is only the easy part of what you’re agreeing to.
Who Can Sign One
The exemption is built around personal use. You have to own the property and intend to live in it yourself. The rule exists so homeowners can work on their own residences, not so unlicensed developers can skip contractor licensing to flip houses. To police that line, most jurisdictions prohibit selling or leasing the property for at least one year after construction wraps up. Sell inside that window without a legitimate reason like a job relocation or medical hardship, and the building department can treat the project as unlicensed contracting, with fines and permit revocation on the table.
Business entities are almost always excluded. If the property sits inside a corporation, LLC, or partnership, the exemption typically doesn’t apply, because those structures are treated as commercial operations rather than individuals improving a home. You also have to supervise the work directly on site. That doesn’t mean doing every task yourself, but you can’t hand the project off to an unlicensed friend and disappear for weeks. The department expects you to be the person running the job day to day.
Breaking these rules has real consequences. Jurisdictions can void permits, issue stop-work orders, or impose administrative fines. The sharper financial pain usually comes later, when you have to tear out uninspected work or bring in a licensed contractor to redo it.
What the Affidavit Asks For
The form collects enough information for the building department to identify your property, understand your project, and hold you accountable. You’ll provide the full legal description of the land (from your deed or property tax records) and the parcel identification number so the department can tie the permit to the right property.
You’ll describe the planned work in enough detail for the department to know which codes apply. Structural changes, electrical upgrades, and plumbing installations fall under different sections of the building code and often trigger separate inspections. You’ll also state the estimated value of the improvement, which matters because permit fees are frequently calculated as a percentage of project cost and the figure can affect future tax reassessments.
Most affidavits ask who is actually doing the labor. If you plan to use helpers, subcontractors, or tradespeople, the form will ask whether they’re licensed. Unlicensed workers typically have to operate under your direct supervision, and licensed subcontractors like electricians and plumbers must hold their own valid trade licenses. Because this is a sworn statement, false information can lead to permit revocation and potential criminal fraud exposure, so get it right.
Notarizing the Signature
Your signature has to be notarized. You sign in the physical presence of a notary public, who verifies your identity with a government-issued photo ID (driver’s license or passport) and applies their official seal. The step is there to keep someone from filing a fraudulent permit application in your name. Once notarized, the affidavit becomes part of the public record for the project.
Notary fees are regulated by state law, and most states cap the charge per signature. Typical fees run from $5 to $15 for an in-person acknowledgment, with a few states allowing up to $25 for remote online notarizations.1National Notary Association. 2026 Notary Fees By State Banks, shipping stores, and law offices commonly offer notary services.
Filing It and Getting Your Permit
The notarized affidavit goes to your local building department along with the permit application and any required plans or drawings. Most departments accept submissions through an online portal, by certified mail, or in person at the permit counter. A permit fee comes with the filing. Minor repair permits may cost a few hundred dollars; new construction or major remodel permits can run into the low thousands, often calculated as a percentage of total project cost.
Once the department processes everything, you receive an official permit number. Post the permit in a visible location at the job site, usually on a permit board near the street or at the main entrance. Inspectors and the public need to see it, and not displaying it is one of the fastest ways to draw a stop-work order.
From there your obligations shift from paperwork to project management. You schedule inspections at each major milestone: foundation, framing, rough electrical, rough plumbing, insulation, and the final inspection, among others depending on your project. These checkpoints verify the work meets code without a licensed contractor overseeing it. Fail an inspection and you fix the deficiency before moving on. Keep all inspection records on site until the building department issues a certificate of occupancy or completion.
Insurance Gaps You Have to Fill
This is where owner-builders most often underestimate what they’ve taken on. A standard homeowners policy almost certainly does not cover an active construction project. Theft of materials, damage to partially completed work, injuries to workers on site, and liability for accidents are common exposures that fall outside the policy.
Builders Risk Insurance
A builders risk policy covers the structure and materials during construction against perils like fire, wind, theft, and vandalism. Coverage can also extend to materials in transit or temporary storage, scaffolding, and debris removal after a covered loss. For a major renovation or a new build, this is not optional in any practical sense. A single storm or a theft of stockpiled materials can erase months of work and tens of thousands of dollars.
Workers’ Compensation
The moment you pay someone to help, workers’ compensation becomes a concern. In most states, if a person gets paid to work on your property, the law presumes they’re your employee regardless of how casual the arrangement feels. That presumption triggers an obligation to carry workers’ comp. If an uninsured worker is hurt on your job site, you can be personally on the hook for medical bills, lost wages, and penalties on top. Even states that let sole proprietors opt out for themselves still require coverage once you have employees. Check your state’s labor department for the thresholds that apply before you hire anyone.
General Liability
If a delivery driver trips over lumber on your property, or your excavation damages a neighbor’s fence, general liability insurance covers the claim. Some homeowners policies include limited premises liability, but the limits are usually too low for a construction site. Talk to your agent about raising coverage or adding a rider before work begins.
Tax Issues Owner-Builders Miss
Many owner-builders assume their sweat equity adds to their home’s cost basis. The IRS doesn’t see it that way. If you built all or part of your home yourself, your basis is limited to what you actually paid out: materials, subcontractor fees, permit costs, and other out-of-pocket expenses. You cannot include the value of your own labor, and you cannot include unpaid labor from friends or family.2Internal Revenue Service. Publication 523, Selling Your Home A lower basis means a larger taxable gain if you ever sell, which can matter even with the Section 121 exclusion.
Paying subcontractors raises a separate question. The IRS requires anyone making payments of $600 or more for services in the course of a trade or business to file Form 1099-NEC for each payee.3Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC Building a personal residence you plan to live in generally isn’t a trade or business, so the filing requirement may not apply. But if you’re building to sell or rent, or you regularly take on construction work, the obligation kicks in. When in doubt, filing is safer than not.
Safety and OSHA
Federal OSHA rules don’t apply to you personally when you’re working on your own home. OSHA’s authority runs to employers and their employees, so a homeowner on their own roof is outside the agency’s reach.4Occupational Safety and Health Administration (OSHA). Standard Interpretations – Residential Properties Hire workers and that flips. Once you have employees on site, you’re an employer subject to OSHA’s construction standards, including fall protection requirements.5Occupational Safety and Health Administration (OSHA). Compliance Guidance for Residential Construction
Even working solo, use the precautions that keep professionals alive: fall protection on roofs, proper scaffolding, de-energized circuits before electrical work, shoring on deep trenches. The affidavit doesn’t change the physics.
Selling or Financing an Owner-Built Home
The one-year sale restriction is enforced, not decorative. Sell or lease inside that window and the building department can treat the project as unlicensed contracting, with fines and legal exposure to follow. Some jurisdictions allow exceptions for genuine hardships like divorce, a job transfer, or serious illness, but the burden of proving the hardship falls on you.
Selling later brings its own practical hurdles. Most states require sellers to disclose known defects and material facts, and the fact that construction was done by an unlicensed owner-builder is the kind of information buyers and inspectors will want. Appraisers may look more carefully at owner-built homes, especially if inspection records are thin.
Financing is often the pinch point for the next buyer too. Some mortgage lenders require a certificate of occupancy, complete inspection records, and evidence that major systems (electrical, plumbing, HVAC) were installed by licensed tradespeople. Missing documentation can slow or kill a sale. Keep meticulous records of every inspection, subcontractor license, and material receipt during the build.
Financing the build itself is also harder as an owner-builder. Construction loans disburse funds in stages as work progresses, and most construction lenders prefer borrowers who are licensed contractors. An owner-builder faces a smaller pool of willing lenders, higher down payment requirements, and more rigorous documentation. Each draw typically requires an inspection before the next installment releases, and some lenders will insist that major systems be installed by licensed subcontractors even where local code would let you do the work yourself. Talk to lenders early, before you commit to the owner-builder route.