The most important decision in any deck project isn’t which material to use or what the design looks like — it’s who builds it. A licensed, experienced contractor protects your investment. An unlicensed or inexperienced one creates liability, code violations, and structural problems that cost more to fix than the original project.
Most homeowners spend weeks researching composite vs. cedar or Trex vs. TimberTech — and then hire the first contractor who gives them a reasonable-sounding number. That’s the wrong order of operations. The contractor determines whether your deck is structurally sound, code compliant, and built to last in Western Washington’s specific climate. The material choice comes second.
This guide gives you the exact framework we’d want a homeowner to use when evaluating any deck replacement contractor — including us. If a contractor can’t answer these questions clearly and in writing, that tells you everything you need to know.
Do You Actually Need a Deck Replacement? Start Here
Before you start calling contractors, it’s worth confirming that full replacement is the right call. Not every deck problem requires a full rebuild — and a contractor who automatically recommends replacement without inspecting the structural framing isn’t giving you an honest assessment.
The key distinction is always in the framing — the joists, posts, ledger board, and footings underneath the surface boards. Isolated surface damage on structurally sound framing is a repair. Systemic structural failure is a replacement. If you’re not sure which situation you’re in, our repair vs. replace guide gives you the framework — including the screwdriver test and the 50% cost rule — to make that call before you start evaluating contractors.
If you’re seeing rot, soft spots, railings that move under hand pressure, or bounce underfoot when walking normally, those are structural signals that warrant a professional assessment. Our guide to common deck problems homeowners ignore covers the specific warning signs — from ledger rot to failed post bases — before you start calling anyone.
1. Verify the Washington State L&I License First
This is the single most important step and takes 30 seconds. Go to lni.wa.gov, click “Verify a Contractor,” and search by the contractor’s business name or license number. A valid license confirms:
- The contractor is registered with Washington Labor & Industries
- They carry the required liability insurance and workers’ compensation coverage
- Their bond is current — which provides recourse if work is abandoned or defective
If a contractor can’t give you their L&I license number immediately when asked, that’s a disqualifying red flag. Licensed contractors have their number ready because they’re proud of it and know you should verify it.
You assume personal liability for any worker injuries on your property. Your homeowner’s insurance may deny claims related to the work. The deck will likely fail permit inspections when you sell — and you’ll be required to bring it to code at your expense. Unlicensed work in Washington State is not a minor issue — it’s a real financial and legal exposure.
2. Confirm Insurance Coverage — Both Types
A valid L&I license confirms workers’ compensation, but you also need to verify general liability insurance separately. Ask for a certificate of insurance naming you as an additionally insured party for the duration of the project. A legitimate contractor provides this without hesitation.
- General liability — covers damage to your property caused by the contractor’s work. If a crew member damages your siding, landscaping, or home structure, this pays for it.
- Workers’ compensation — covers injuries to the crew on your property. Without this, an injured worker can sue you directly as the property owner.
Verify both are current, not just claimed. Ask for the certificate and confirm the coverage amounts are appropriate for your project scope.
3. Ask Specifically About Deck Experience — Not General Construction
Many general contractors build decks as part of a broader remodeling business. That’s not the same as a contractor who specializes in decks. The structural details that matter — ledger board connections, post base hardware, joist spacing, flashing at the house connection — require specific experience that general remodelers often lack.
Ask directly: how many deck replacement projects have you completed in King or Pierce County in the last 12 months? A contractor who does 3–4 deck replacements per year has fundamentally different experience than one who does 30–40. Ask to see photos of completed projects — specifically in the Pacific Northwest, where moisture conditions are different from drier climates most national guides are written for.
A contractor who can show you photos of completed projects in your area, name specific neighborhoods they’ve worked in, explain how they spec materials for shaded vs. sun-exposed lots, and describe their process for ledger board connections and permitting — that’s deck-specific experience. Vague answers about “quality craftsmanship” without specifics are not.
If you’re in the Eastside and want to see what deck-specific local expertise looks like in practice, our Redmond deck team assesses wooded lots, shaded builds, and drainage conditions specific to King County before any material recommendation is made.
4. Require an Itemized Written Estimate — Not a Single Number
A contractor who gives you a single number — “$18,000 for your deck” — is giving you nothing useful. You have no way to compare it against other bids, no way to understand what’s included, and no protection if the scope expands mid-project.
A legitimate itemized estimate breaks down:
- Labor — separated by phase: demolition, framing, decking, railing
- Materials — specific product names, not just “composite decking.” You should see “Trex Transcend Gravel Path, 5/4 x 6 x 16′” or equivalent specificity
- Permit fees — King County and City permits run $500–$1,500 depending on scope. If permits aren’t on the estimate, ask why
- Demolition and haul-away — if you have an existing deck, this should be a separate line item ($3–$8 per sq ft in King County)
- Cleanup — should be explicit, not assumed
For full pricing context on what each line item should cost in King and Pierce County, our deck replacement cost guide covers every component with 2026 local ranges.
A significantly lower estimate almost always means one of three things: inferior materials, no permits being pulled, or scope exclusions that will become change orders mid-project. A deck built without permits in King County will fail inspection when you sell — and you pay to fix it.
5. Ask Who Pulls the Permits and Who Does the Work
Who pulls the permits? The contractor should always pull permits — not the homeowner. If a contractor asks you to pull your own permits, or suggests permits aren’t necessary, walk away. In Washington State, the contractor’s license is attached to the permit. If something goes wrong, they’re accountable. That accountability is the point.
Who actually builds the deck? Many larger contractors subcontract the physical work to third-party crews they have limited oversight over. Ask directly: is the crew that will build my deck your crew, on your payroll? A contractor who uses their own crew has direct accountability for every connection and detail.
Our Trex decking cost guide shows exactly what a properly itemized estimate looks like — broken down by collection, square footage, and installed cost in King County — so you know what to expect when comparing bids.
6. Understand the Warranty — Workmanship vs. Materials
There are two separate warranties in any deck project — and they cover completely different things:
Manufacturer material warranty — covers the decking boards themselves. Trex Transcend carries a 25-year fade and stain warranty. TimberTech AZEK carries similar coverage. These warranties are only valid when the product is installed by a licensed contractor following the manufacturer’s installation guidelines. An unlicensed installer voids the material warranty.
Contractor workmanship warranty — covers the quality of the installation itself: framing connections, ledger attachment, post bases, railing installation, and overall structural integrity. Ask specifically: what does your workmanship warranty cover, for how long, and what’s excluded? Get it in writing as part of the contract.
A contractor who offers no workmanship warranty on a deck project is telling you something important about how they feel about the quality of their own work.
7. Red Flags That Should Stop You Immediately
- Can’t provide an L&I license number immediately when asked
- Asks you to pull your own permits or suggests permits aren’t needed
- Quotes a single number with no itemized breakdown
- Asks for more than 40% deposit upfront before work begins
- Can’t show photos of completed deck projects in the Pacific Northwest
- Provides a verbal estimate only — no written contract
- Pressures you to sign immediately or claims the price is only good for 24 hours
- Suggests building without permits to “save you money”
- Can’t name specific decking products — just says “composite” or “wood”
- Has no physical address or only a PO box
These aren’t minor concerns — each one represents a real financial or structural risk. The Pacific Northwest market has no shortage of contractors who operate without proper licensing, particularly after significant wind or storm events when demand spikes. Verifying on lni.wa.gov takes 30 seconds and protects you from all of it.
Not sure which material to specify when evaluating bids? Our complete decking material guide compares cedar, composite, PVC, and Trex side by side with PNW-specific performance data — so you can verify that what a contractor is proposing is actually the right spec for your lot.
The 8 Questions to Ask Every Deck Contractor Before Hiring
Any legitimate contractor gives this immediately. Verify it at lni.wa.gov before the conversation continues.
This separates deck specialists from general contractors who occasionally build decks. A credible answer is a specific number with photos.
The contractor should always pull permits. If they suggest otherwise, that’s a disqualifying answer.
Know who is on your property and who the contractor is accountable to for quality.
Not a range, not a ballpark, not a single number. Specific products, specific labor costs, permits, demo, and cleanup — all in writing before you commit to anything.
Get this in writing as part of the contract. Verbal warranties are unenforceable.
Standard steel corrodes in 3–5 years in our climate. A contractor who knows what they’re doing specifies corrosion-rated hardware without you having to ask. A contractor who doesn’t know what you’re talking about when you ask this question hasn’t built many decks in Western Washington.
Recent references from deck-specific projects in your area are the most useful. General Google reviews tell you about customer service — a reference from a specific completed project tells you about the quality of the work over time.
If you’re still in the research phase and haven’t decided on a material yet, our complete decking material guide covers every option with PNW-specific performance data so you can walk into contractor conversations knowing exactly what to ask for.
Ready to get a straight answer from a licensed Eastside deck contractor?
Orca Roofing & Exteriors is a licensed deck contractor serving Bellevue, Tacoma, Kirkland, Redmond, and the broader Puget Sound. Our L&I license is verifiable at lni.wa.gov. We provide fully itemized estimates, pull all permits, and build with our own crew from assessment through final inspection. Request your free estimate →
FAQs – Choosing a Deck Replacement Contractor
How do I verify a deck contractor's license in Washington State?
Go to lni.wa.gov, click “Verify a Contractor,” and search by business name or license number. This confirms the contractor is registered with Washington Labor & Industries, carries required insurance and workers’ comp coverage, and has a current bond. It takes 30 seconds and is the most important step before hiring anyone.
What should a deck contractor estimate include?
A legitimate estimate includes itemized labor by phase, specific materials with product names and grades, permit fees, demolition and haul-away costs if applicable, and cleanup. Any estimate that gives you a single number without these line items is not sufficient — you have no way to compare it against other bids or identify what’s excluded.
Should I hire a deck specialist or a general contractor?
For deck replacement or new construction, a contractor who specializes in decks is almost always the better choice. Deck-specific structural details — ledger board connections, post base hardware, flashing, joist spacing — require experience that general remodelers who occasionally build decks typically lack. Ask specifically how many deck replacement projects they’ve completed in the last 12 months.
Do I need permits for a deck in Washington State?
Yes. Most deck builds and replacements in King and Pierce County require a permit through the county or city. A contractor who suggests skipping permits is creating liability for you — unpermitted work fails inspection at resale and your homeowner’s insurance may deny claims. A legitimate contractor always pulls permits and includes the fee in the estimate.
How much deposit should I pay a deck contractor upfront?
A standard upfront deposit for a deck project in Washington is 20–35% of the total contract value. More than 40% upfront before work begins is a red flag. The balance should be tied to project milestones, with final payment held until the permit is closed and you’ve done a walkthrough.
What is the difference between a material warranty and a workmanship warranty on a deck?
The material warranty covers the decking boards — Trex and TimberTech offer 25-year warranties when installed by a licensed contractor. The workmanship warranty covers the quality of installation — framing connections, ledger attachment, railing installation, structural integrity. These are separate. A contractor who offers no workmanship warranty is not standing behind their own work.
