Ask House Spouse · Exterior & Weatherproofing · Decks & Outdoor Structures
How much does it cost to repair a deck in the Seattle area?
Short answer
For minor deck repairs like replacing a few rotten boards or securing a loose handrail, expect to start at our $580 handyman minimum. Larger repairs involving multiple boards, stair treads, or structural posts can range from $1,200 to $4,500 or more, depending on the extent of wood rot and material choice.
What Drives Deck Repair Costs?
The cost of a deck repair is almost entirely dependent on the extent of the wood rot and the type of components affected. Replacing a few surface boards is straightforward. The complexity and cost increase significantly when the damage involves structural elements like joists (the beams under the deck boards), support posts, or the ledger board attached to your home. The choice of replacement material, from pressure-treated lumber to cedar or composite decking, also plays a major role in the final price.
The Critical Ledger Board Connection
The single most important part of your deck's structure is the ledger board, which fastens it to your house. In Washington, improper flashing at this connection is a frequent point of failure. Water gets behind the board, rotting not only the deck's main support but also the framing of your home. Repairing a rotted ledger is an advanced job that involves temporarily supporting the deck, removing siding, replacing rotten structural wood, and installing new, code-compliant flashing. This is a core competency for an experienced general contractor.
Material Choices: Repair vs. Upgrade
When replacing boards, you can match the existing material or see it as an opportunity to upgrade. Pressure-treated lumber is the most affordable option. Cedar offers natural resistance to rot and a classic PNW look but requires maintenance. Composite decking costs the most upfront but offers superior durability and minimal upkeep. We can source materials to match your existing deck or walk you through the pros and cons of upgrading sections to composite.
Planning Your Repair with My House Spouse
For smaller repairs, we can often bundle the work into our standard half-day handyman visit, which starts at a $580 minimum for up to 4 hours of labor. For more extensive projects, we provide a detailed, flat-rate proposal after a thorough on-site assessment. This proposal will clearly outline the scope of work, material costs, and the steps we'll take to ensure your deck is safe, stable, and ready for years of continued enjoyment.
Why it happens
In the Pacific Northwest, the primary cause of deck failure is relentless moisture. Our long, rainy seasons saturate wood, creating the perfect environment for fungal rot, especially in joints, end-grain, and areas where debris traps water. Over time, this rot weakens boards, railings, and even the critical support posts and ledger board that attaches the deck to your house. Deferred maintenance accelerates this process. Without regular cleaning and sealing, wood is left exposed to both rain and UV rays, which break down its fibers. Fasteners can also work loose through natural expansion and contraction, leading to wobbly railings and unsafe connections long before the wood itself fully deteriorates.
How to diagnose it
- 1Perform the 'screwdriver test': Firmly poke areas that look dark, discolored, or splintered. If the screwdriver sinks in easily or the wood feels soft and spongy, you have active rot.
- 2Check the ledger board where the deck meets the house. Look for proper metal flashing. Any staining on the siding below, or soft wood on the ledger, points to a potentially serious structural issue.
- 3Wobble the railings and support posts. A little flex can be normal, but significant movement indicates loose hardware or rot at the connection points.
- 4Scan the deck surface for cupped or warped boards, which are tripping hazards. Look for nail or screw heads that have popped up.
- 5Inspect the stairs carefully, especially the 'stringers'—the sawtooth-shaped supports. Check for rot where they make contact with the ground or a concrete pad.
DIY vs. professional
DIY-friendly if…
A homeowner can typically handle staining the deck, swapping a single non-structural board, or tightening accessible bolts on a railing.
Call a pro when…
Call a licensed general contractor like My House Spouse for any rot near the house (ledger board), wobbly support posts, multiple board replacements, or stair repairs, as these are safety-critical.
Cost expectations
$580–$4,500typical WA labor + materials
Cost is driven by the extent of rot, material type (cedar vs. composite), and whether structural posts or ledger boards are involved. Our $99 trip charge is waived for HomeCare+ members.
Every House Spouse job is quoted in writing before we start. 12-month workmanship warranty included.
What we see on Home Health Assessments
Around 74% of PNW roofs we assess show active moss establishment — accelerates shingle wear by an estimated 3–5 years if untreated.
Caught early on assessment: $220–$650 · Left until failure: $3,500–$22,000
During a Home Health Assessment, we methodically inspect your deck's structure, from the ledger board flashing down to the post footings. We identify early signs of rot and loose connections before they become major safety hazards or require costly repairs.
How the Home Health Assessment worksServices we'd bring to this job
Where we handle this
We answer this question on real Home Health Assessments across Snohomish and King County.