Hiring an unlicensed contractor for a room addition isn't just risky—it can void your homeowner's insurance and cost you tens of thousands in repairs. Before you sign any contract, you need to verify that the contractor has the credentials to actually do the work. Here's exactly what to check.
Licensing and Permits
Your contractor must hold a valid general contracting license in your state. Licensing requirements vary widely—some states require it for any job over $500, others only for work over $5,000—but you should always ask to see their current license before scheduling a consultation.
Call your local building department and ask them to verify the license number yourself. Don't rely on the contractor's word. While you're there, ask if they pull permits for additions. A contractor who tries to avoid permitting for structural work (like adding a bedroom or bathroom) is a major red flag. Permits typically cost $200–$1,500 depending on the project scope, but they protect you legally and ensure the work meets code.
Insurance Coverage
Any legitimate contractor should carry general liability insurance and workers' compensation insurance. Ask to see current certificates of insurance directly from their insurance company—not copies from the contractor's file.
General liability protects you if someone is injured on your property or if damage occurs to your home. Workers' compensation covers their employees if they're hurt on the job. If a contractor has neither and an injury happens, you could be liable. Verify the coverage amounts; for a typical $30,000–$80,000 addition, minimum coverage of $500,000 to $1 million is standard.
Bonding
A performance bond (also called a contractor bond) guarantees that the contractor will complete the work or reimburse you if they abandon the project. Surety bonds typically cost 1–3% of the total project cost, and many states require them for public projects.
Ask for a copy of their bonding certificate. If a contractor balks at this or says it's "too expensive," that's a signal they may not have the financial stability to see your addition through to completion.
References and Track Record
Request at least three references from completed room or home additions—not kitchen remodels or other projects. Call them. Ask about:
- Whether the project stayed on budget and timeline
- How the contractor handled change orders and unexpected issues
- Quality of the final product after 6–12 months
- Communication during the project
For a $50,000 addition, expect timelines of 8–16 weeks depending on complexity and weather. If all references report the same contractor issues—delays, poor communication, cost overruns—move on.
Professional Memberships and Certifications
Membership in organizations like the National Association of Home Builders (NAHB), Associated General Contractors (AGC), or local builder associations indicates a commitment to industry standards. Some states also require continuing education for license renewal.
Ask if they're certified in any relevant specialties—structural framing, energy efficiency upgrades, or accessibility modifications. These certifications can translate to better workmanship, especially for complex additions.
Background Check and Legal History
Search your state's contractor board online for any complaints or disciplinary actions against their license. Most states maintain public databases. You're looking for patterns: a single old complaint isn't necessarily disqualifying, but multiple unresolved issues or license suspensions are serious warnings.
Also run a quick background check through court records or use services like Google Scholar. You're checking for lawsuits involving unpaid subcontractors or homeowners—common signs of financial trouble.
Contracts and Written Estimates
Before hiring, insist on a detailed written estimate that specifies:
- The scope of work (square footage, materials, finishes)
- Total cost broken into labor, materials, and permits
- Start and completion dates
- Payment schedule (never pay more than 10% upfront; never pay in full before completion)
- Warranty terms
A vague estimate is a red flag. You should be able to compare apples-to-apples between contractors. If estimates vary wildly—one contractor quotes $40,000 and another $65,000 for the same scope—dig into why.
If you're comparing multiple contractors, platforms like Mercoly let you review credentials and estimates from trusted home addition providers side-by-side, saving time and reducing the risk of hiring the wrong team.
Frequently Asked Questions
Q: Can I hire a contractor without a license if they charge me less? No. Unlicensed contractors void most homeowner's insurance claims, and you have almost no legal recourse if they damage your home or leave the job unfinished. The short-term savings disappear quickly.
Q: How do I know if a contractor's insurance is actually active? Contact the insurance company directly using the phone number on the certificate—not the number the contractor provides. Ask them to confirm coverage is current and active.
Q: What should I do if a contractor won't provide references? Walk away. Any established contractor doing room additions has completed past projects and should be proud enough to share them.
Start verifying credentials today—your addition's success depends on hiring someone qualified to do it right.