Questions to Ask a Deck Contractor Before Signing a Contract

Before signing a contract with a deck contractor, you should ask about their license and insurance status, get a detailed written estimate, confirm the project timeline, and understand exactly what's included — and excluded — from the price. These questions protect you from unexpected costs, shoddy work, and legal headaches that homeowners commonly encounter when they skip the vetting process.

A deck is a significant investment. According to the National Association of Realtors' 2024 Remodeling Impact Report, a new wood deck costs roughly $17,200 on average to build, and a composite deck runs closer to $24,700. With that kind of money on the line, spending an extra hour asking the right questions before you sign is time well spent.

Are You Licensed and Insured?

This is the single most important question, and it should be the first one you ask. Most states and many municipalities require deck contractors to hold a valid contractor's license. A license means the builder has met minimum competency standards and is registered with local authorities.

You also need to confirm two types of insurance:

• General liability insurance — covers damage to your property during construction (e.g., a crew member accidentally breaks a window or damages your siding).
• Workers' compensation insurance — covers injuries to workers on your property. Without it, you could be liable if someone gets hurt on your job site.

Don't just take their word for it. Ask for a copy of their certificate of insurance (COI) and verify it's current. You can call the insurance company listed on the certificate to confirm the policy is active.

Can I See Your Previous Work and References?

Any reputable contractor should be happy to share photos of completed deck projects and provide contact information for at least three recent clients. When you call those references, ask:

• Did the project stay on budget?
• Did it finish on time?
• Were there any issues, and how did the contractor handle them?
• Would you hire them again?

Pay attention to how those past clients describe communication. A contractor who builds a solid deck but is impossible to reach or dismissive of concerns can turn your project into a stressful ordeal.

If the contractor has an online presence, check reviews on Google, the Better Business Bureau (BBB), and your state's contractor licensing board. A single bad review isn't necessarily a deal-breaker, but a pattern of complaints about the same issue — missed deadlines, surprise charges, unfinished punch lists — is a red flag.

What Exactly Is Included in the Price?

This question prevents the most common source of disputes between homeowners and contractors. Get a written, itemized estimate — not just a lump sum — that specifies:

• Materials: What species of wood or brand of composite? What grade of lumber? What type of fasteners (hidden clip systems, stainless steel screws, galvanized nails)?
• Labor: Is demolition and removal of an old deck included? What about grading the site or addressing drainage issues?
• Permits: Who pulls the building permit, and who pays for it? Permit fees typically run $75–$500 depending on your municipality and deck size.
• Inspections: Will the contractor schedule required inspections, or is that your responsibility?
• Cleanup and disposal: Is hauling away construction debris included, or will you need a separate dumpster rental ($300–$600 for a 10-yard container)?

For context, pressure-treated wood decking generally runs $15–$35 per square foot installed, while composite decking typically costs $30–$60 per square foot installed. These ranges vary by region, deck complexity, and height off the ground, but they give you a baseline to evaluate whether an estimate is reasonable.

What Is the Payment Schedule?

Be cautious of any contractor who demands full payment upfront. A typical and fair payment structure looks something like this:

Holding back that final 10%–20% until after a walkthrough gives you leverage to ensure everything is finished to your satisfaction. This is sometimes called retainage, and it's standard practice in construction.

If a contractor insists on more than 50% upfront before any work begins, that's a significant red flag. Legitimate contractors have established accounts with lumber yards and suppliers; they shouldn't need your money to fund other projects.

What Is the Timeline, and What Could Delay It?

Get specific start and completion dates in writing. A typical ground-level deck (roughly 200–400 square feet) takes most crews one to two weeks to build once work begins. Elevated or multi-level decks with stairs, custom railings, or built-in features can take three to four weeks or more.

But the real question is: what happens between signing and starting? Many good contractors are booked four to eight weeks out during peak season (spring and summer). Ask for a realistic start date and find out:

• Will your crew be on-site full time, or will they split time between jobs?
• What happens if weather causes delays — does the completion date adjust automatically?
• Is there a clause in the contract for significant delays? Some contracts include a per-day penalty for the contractor if the project runs past the agreed-upon window without valid cause.

Who Will Be On-Site Managing the Work?

Sometimes the person who sells you the job isn't the person who shows up to build it. Ask whether the contractor uses their own employees or subcontractors. Neither is automatically bad, but you should know:

• Who is the day-to-day project manager or lead carpenter?
• How do you reach that person if you have questions during construction?
• If subcontractors are used, are they also licensed and insured?

A clear chain of communication — knowing exactly who to call and when to expect updates — makes the entire project smoother.

How Do You Handle Permits and Code Compliance?

Most jurisdictions require a building permit for a new deck, especially if it's attached to the house or elevated more than 30 inches above grade. The contractor should handle the permit application and know local building codes inside and out, including:

• Footing depth requirements — concrete footings (the underground supports your deck posts sit on) must extend below the frost line in cold climates, which can be 36–48 inches deep in northern states.
• Railing height requirements — most codes require railings on decks 30 inches or more above grade, typically at least 36 inches tall (42 inches in some areas).
• Ledger board attachment — the board that connects your deck to your house must be properly flashed and bolted (not nailed) to prevent water infiltration and structural failure. This is one of the most common points of deck failure.
• Load requirements — decks must support at least 40 pounds per square foot of live load (people, furniture) plus 10 psf of dead load (the weight of the deck itself), per the International Residential Code.

If a contractor suggests skipping the permit to "save you money," walk away. An unpermitted deck can result in fines, forced removal, problems selling your home, and void your homeowner's insurance coverage if someone is injured.

What Warranty Do You Offer on Your Work?

There are two separate warranties to ask about:

• Workmanship warranty: This covers the contractor's labor — things like improperly installed joists, loose railings, or decking boards that weren't properly spaced. A one-year workmanship warranty is minimal; reputable builders typically offer two to five years.
• Material warranty: This comes from the manufacturer, not the contractor. Composite decking brands like Trex, TimberTech, and Fiberon offer warranties ranging from 25 years to limited lifetime, but these warranties often have specific installation requirements. If the contractor doesn't follow them, the warranty could be void.

Ask the contractor to confirm, in writing, that they will install materials according to manufacturer specifications. This protects your material warranty.

What Happens If We Discover Problems After Construction?

Even with the best contractors, issues sometimes surface after the project wraps — a board warps, a railing post loosens, or a drainage problem emerges after the first heavy rain. Before signing, ask:

• What is your process for handling warranty claims or callbacks?
• How quickly do you respond to post-construction issues?
• Is there a written policy for this in the contract?

A contractor who has a clear, documented process for handling post-build issues is one who stands behind their work. Vague answers like "just give me a call" aren't reassuring when you're six months out and dealing with a problem.

Putting It All Together: A Quick Checklist

Here's a summary you can print or save before your next contractor meeting:

1. Verify license and insurance (ask for documentation).
2. Check references and past project photos.
3. Get a detailed, itemized written estimate.
4. Understand the payment schedule — never pay more than a third upfront.
5. Confirm start date, completion date, and delay policies.
6. Ask who manages the job day to day.
7. Ensure they handle permits and follow local building codes.
8. Clarify workmanship and material warranties.
9. Understand the process for post-construction issues.
10. Read the entire contract before signing — every page, every clause.

Taking these steps doesn't guarantee a perfect project, but it dramatically reduces your risk of hiring the wrong contractor. The best builders welcome these questions because they've already built systems around answering them.

If you're ready to start comparing qualified, pre-screened deck contractors in your area, get matched with a local deck builder using the form on our home page.