Hiring the wrong contractor is one of the most expensive mistakes a homeowner can make. On Long Island and throughout the Tri-State area, unlicensed work, abandoned projects, and permit violations cost property owners millions of dollars every year. The good news: most of those situations are avoidable if you know what to look for before you sign anything. This guide walks you through exactly how to vet a contractor, what questions to ask, and which warning signs should send you looking elsewhere.
Start With Licensing and Insurance — Non-Negotiable
In New York, general contractors performing work above a threshold dollar amount must hold a valid Home Improvement Contractor (HIC) license issued by their county. Suffolk County and Nassau County each maintain their own licensing databases, which are searchable online. Before anything else, ask for the contractor's license number and verify it yourself. A legitimate contractor hands that number over without hesitation.
Beyond the HIC license, confirm two types of insurance:
- General liability insurance — protects your property if the crew causes damage during the job. Minimums vary; a credible contractor carries at least $1 million per occurrence.
- Workers' compensation — covers crew members injured on your property. Without it, you can be held liable for medical bills and lost wages. Ask for a current certificate of insurance (COI) naming you as an additionally insured party, and call the insurer to confirm it is active.
Specialized trades require additional licenses. Plumbing work in New York must be performed by or under the direct supervision of a licensed Master Plumber. If your project includes plumbing, verify that license separately.
Check References and Past Work
Ask for at least three references from projects completed within the past two years, and actually call them. The questions that matter most: Did the project finish on schedule? Did the final cost match the contract? Were there permit issues, and how were they handled? Would you hire this contractor again?
Portfolio photos are helpful, but in-person visits to finished projects — with the homeowner's permission — tell you far more. A contractor who builds additions, kitchen remodels, or bathroom renovations regularly will have local references within a reasonable drive.
Also check the Better Business Bureau, Google reviews, and the New York State Attorney General's complaint database. A pattern of unresolved complaints is a hard stop.
Understand Permits Before Work Begins
On Long Island, virtually every structural project — additions, room conversions, new construction, HVAC system changes — requires a building permit from your town or village. A contractor who tells you permits "aren't necessary" or suggests pulling permits in your name to sidestep contractor licensing is a red flag you cannot ignore.
Unpermitted work creates serious problems at resale: title companies flag it, buyers walk, and lenders won't finance against it. Worse, the municipality can order demolition. Any reputable contractor handling home additions, new construction, or HVAC installations will pull permits and schedule inspections as a standard part of the job.
Read the Contract Line by Line
A written contract is not optional. New York State law requires written contracts for home improvement work over $500. A solid contract should include:
- A detailed scope of work with materials specified by brand, grade, and quantity where applicable
- Start and estimated completion dates with milestone benchmarks
- A payment schedule tied to progress — not a large upfront lump sum
- A process for handling change orders (cost changes in writing, signed before work proceeds)
- A lien waiver provision so subcontractors and suppliers cannot lien your property if the general contractor fails to pay them
- Warranty terms for both labor and materials
In New York, you also have a three-day right of rescission on most home improvement contracts signed at your home. Use it if you have second thoughts after signing.
Red Flags That Should End the Conversation
Even experienced homeowners miss warning signs that seem minor in isolation. Watch for these:
- No physical address or office. Contractors working out of a pickup truck with a post office box are harder to hold accountable when problems arise.
- Unusually low bids. If one estimate comes in 30 to 40 percent below all others, something is being cut — labor, materials, insurance, or permits. A low price is not a bargain if you end up paying twice to fix the work.
- Pressure to decide immediately or claims that the price is only good "today." Legitimate contractors give you time to review proposals.
- Demands for cash or a large deposit upfront. New York law caps the initial deposit on home improvement contracts. Asking for more than 10 to 15 percent before work starts is a warning sign.
- Reluctance to provide the license number or COI. Any hesitation here ends the conversation.
- No written contract or vague scope language. "Remodel kitchen" with no specifications leaves every decision open to dispute.
- Subcontractors not disclosed. If portions of your project will be delegated to subs, you have a right to know who they are and to verify their credentials.
Local Knowledge Matters
A contractor familiar with Long Island's housing stock — the Cape Cods, raised ranches, split levels, and colonial-era framing common across Suffolk County — brings real advantages. They know which towns require pre-application meetings, where soil conditions complicate foundation work, how the coastal climate affects material selection, and which inspectors to coordinate with for timely certificate-of-occupancy approvals.
That local fluency matters even more for complex projects like design-build renovations, modular home placement (see our modular home options), or demolition and rebuild scenarios that involve multiple municipal departments.
Ask About Financing Early
A major renovation is a significant investment. Reputable contractors will discuss financing options transparently rather than burying costs. Milton's Construction works with Enhancify, which lets homeowners check their rate without any impact to their credit score — a useful option if you want to understand your full budget picture before scoping the project.
Get Your Free Estimate From a Contractor With 40 Years on Long Island
Milton's Construction has been licensed and insured for over 40 years, serving homeowners across Long Island, New Jersey, and Pennsylvania. Every project starts with a straightforward conversation about what you need, what the realistic scope looks like, and what to expect from the permit and construction process — no pressure, no surprises. Call us at (631) 741-0199 or visit our contact page to schedule your free estimate. You can also browse completed work on our projects page to see the quality we bring to every job.
