How to Vet a Seattle Driveway Contractor: Questions to Ask and Bids to Compare
Last Updated:A driveway is one of the few home projects where most of the quality is buried: base depth, compaction, and reinforcement are covered by concrete within a day. That makes vetting the contractor more important than comparing finishes. This hiring checklist covers registration checks, the questions that separate careful driveway builders from fast ones, line-by-line bid comparison, and what a written quote must contain. When you are ready to scope the job itself, see our concrete driveway installation and replacement page.
Step 1: Check registration on L&I's Verify a Contractor tool
Washington requires construction contractors to register with the Department of Labor & Industries (L&I), and registration requires a surety bond and liability insurance. Before you invite anyone to bid, look them up on L&I's official Verify a Contractor, Tradesperson or Business tool.
- Search by business name, owner name, contractor license number, or UBI number. Make sure the business name on the bid matches the registered name.
- Confirm the registration is active and won't expire partway through your project.
- Check the bond and insurance details, including any lawsuits filed against the bond.
- Look at workers' comp. If the contractor has employees, the account should be active. L&I warns that without that coverage you could be held liable if a worker is hurt on your property.
- Review infractions and safety citations.
Questions to ask a Seattle driveway contractor
Ask every bidder the same questions so their answers can be compared. Vague answers on the first four are the most telling.
- How deep will the gravel base be, and how will it be compacted? A good answer names a depth and a method, not "whatever it needs."
- What slab thickness and reinforcement are you quoting? Rebar, wire mesh, or fiber should be written down, with thicker sections where trucks or RVs park.
- Where will the control joints go? Ask for a sketch. Joint layout decides where the slab cracks.
- How will water drain off the driveway? Slope direction matters most near the garage and the house.
- Who pulls the permits? The contractor should, not you.
- Where does the old concrete go? Seattle requires it to be recycled, so haul-off should name a destination.
Seattle-specific questions
Three local issues deserve their own questions. First, Seattle sub-grades are often clay or glacial till that holds water. Ask how the bidder handles soft spots found after tear-out and how that change is priced. Second, ask what happens if rain is forecast on pour day. A careful contractor reschedules or tents the pour instead of finishing a wet slab. Third, if the work touches the apron, curb, or public sidewalk, ask how they handle City right-of-way permits and SDOT inspections. Our Seattle driveway approach permit guide explains that process.
How to compare driveway bids line by line
Put the bids side by side and compare scope before price. A low number usually means a missing line, not a better deal.
| Line item | What to compare | Common gap |
|---|---|---|
| Demolition and haul-off | Square footage removed, disposal destination | Haul-off excluded or "by owner" |
| Excavation and base | Base depth, material, compaction method | No depth stated |
| Reinforcement | Rebar size and spacing, mesh, or fiber | "Reinforcement as needed" |
| Concrete | Thickness, mix strength, air entrainment | Thickness not listed |
| Finish and joints | Finish type, joint layout, edge detail | Joints not mentioned |
| Permits and right-of-way | Who applies, fees included or not | Permits left to the homeowner |
| Curing, sealing, cleanup | Cure method, sealer type, site restoration | Sealer implied but not priced |
For what each line typically costs in the Seattle market, see concrete driveway cost in Seattle. To understand what each step involves on site, read the concrete driveway process, step by step.
What a written driveway quote should include
L&I's hiring guidance says to get bids in writing and to read the whole contract before signing. At minimum, the contract should cover:
- The total price, including sales tax.
- Payment terms tied to completed phases, plus a completion date.
- Permit fees, if any apply.
- The specific work: square footage, thickness, base, reinforcement, finish, and joint layout.
- Materials, major suppliers, and any subcontractors.
- Warranty terms and how change orders are approved and priced.
For residential work of $1,000 or more, Washington law requires the contractor to give you a written disclosure statement (the "Notice to Customer") before work starts. It lists the contractor's registration and bond and explains that unpaid suppliers or subcontractors can lien your property. Before the final payment, ask for lien releases from major suppliers, such as the ready-mix plant.
Red flags that should end the conversation
- Credentials or references you can't verify, or a business name that doesn't match the L&I record.
- Door-to-door "leftover concrete" offers, special prices that require signing today, or high-pressure tactics.
- Cash only, a large deposit, or full payment up front. L&I advises paying as phases are completed and holding the final payment until the work is done.
- Requests to make the check out to a person instead of the business.
- Asking you to pull the permit yourself.
- No written contract, or a lump-sum bid that won't itemize base, thickness, or reinforcement.
- An unusually long warranty, or a bid far below the others with no clear scope difference.
These checks apply to any concrete trade. Our broader guide on how to choose a concrete contractor covers references and warranties in more depth. To get a written, itemized driveway estimate, call Seattle Concrete at (206) 552-9998.
Frequently asked questions
How do I check a Washington contractor's registration?
Use the Department of Labor & Industries' Verify a Contractor, Tradesperson or Business tool at secure.lni.wa.gov/verify. You can search by business or owner name, license number, or UBI number. The record shows whether the registration is active, the bond and insurance on file, any lawsuits against the bond, workers' comp status, and infractions.
What questions should I ask a driveway contractor before signing?
Ask how deep the gravel base will be and how it will be compacted, what thickness and reinforcement are included, where the control joints go, how water will drain, who pulls the permits, where the old concrete will be recycled, and what happens if rain is forecast on pour day.
How do I compare driveway bids that are far apart in price?
Line them up by scope: demolition and haul-off, base depth, reinforcement, slab thickness, finish and joints, permits, curing, and cleanup. A much lower bid usually leaves out a line item or uses a thinner base or slab. Ask each bidder to fill in the missing details in writing before you compare totals.
What should a written driveway quote include?
The total price with sales tax, payment terms and a completion date, permit fees, the specific work (area, thickness, base, reinforcement, finish, joints), materials and subcontractors, and warranty and change-order terms. For residential jobs of $1,000 or more, the contractor must also give you Washington's disclosure statement before work begins.
How much should I pay up front for a concrete driveway?
L&I advises a reasonable down payment, then paying only as specific phases are finished. Avoid cash-only deals, large deposits, and full payment up front. Hold the final payment until the work is complete and you have lien releases from major suppliers.
