Multi-Level / Elevated Deck
Multi-level or elevated deck construction is the build path for any residential deck where the surface is more than 30 inches above grade at any point — the threshold at which Washington State Residential Code requires structural engineering, code-spec guardrails, graspable handrails on every stair flight with more than three risers, and a Seattle DCI building permit pulled and inspected. Stepped landings between two or three levels are the most common multi-level configuration in the Seattle market because most local lots slope at least one direction and a single-level deck on a sloped lot wastes the lot's vertical structure. Engineered helical piles (the right answer on Seattle clay and hillside fill) or concrete piers below frost line carry the load down to bearing soil; LVL or laminated pressure-treated beams span between posts; pressure-treated 2x joists at 12 or 16-inch on center carry the deck boards; cedar, PT, composite, PVC, or tropical hardwood at the homeowner's selection finishes the surface. Five to eight working weeks of on-site construction plus 4 to 6 weeks for engineering review and Seattle DCI permit issuance before ground breaks. From $35,000 for a two-level 400 square-foot cedar or PT deck on engineered footings to $80,000 for a three-level 700+ square-foot composite or PVC build with cable rail across every level, integrated lighting on every stair flight, and a built-in bench at the lower level. Handis pulls the building permit as general contractor and coordinates the licensed Washington PE; both pass through as named line items, never as surprise margin. Any line-voltage lighting or hot-tub circuit routes to a licensed Washington L&I electrician.
Service
What Multi-Level / Elevated Deck Construction Covers
A multi-level or elevated deck is the build path for any residential deck where the surface is more than 30 inches above grade at any point — the threshold at which Washington State Residential Code triggers structural engineering, code-spec guardrails (36-inch minimum height, no spheres greater than 4 inches through balusters), graspable handrails on every stair flight with more than three risers, and a Seattle DCI building permit. Stepped landings between two or three levels are the most common multi-level configuration in the Seattle market because most lots slope at least one direction. Handis owns the carpentry and the project schedule end-to-end; the permit is pulled by Handis as general contractor under our contractor license; structural engineering subs to a licensed Washington PE we have worked with for years; any line-voltage circuit (lighting, hot tub, in-deck heater) routes to a licensed Washington L&I electrician.
Pre-Build Survey, Soil Probe, Engineering Trigger Confirmation
The first visit measures the existing or proposed footprint, takes an elevation reading at every footing position with a laser level (Seattle lots that slope often have a 2 to 4-foot drop across a 20-foot run that is not obvious to the eye), hand-augers a soil probe at every footing location (not just one or two — Seattle yards routinely transition from native till to old fill within the same lot and the bearing capacity changes), and confirms that the deck triggers engineering and permit (it does, on any surface more than 30 inches above grade at any point). We name the engineer on the quote, name the engineering fee as a pass-through line item, and file the permit application the day we sign.
Engineering Stamp, Permit Application, Plan Review
The licensed Washington PE develops the structural drawings — footing schedule (helical pile vs concrete pier sized to soil bearing capacity and load), beam sizing (LVL or laminated PT depending on span and load), post sizing, joist spacing, ledger detail (a critical drawing because ledger flashing is the single most common deck failure point in PNW), and railing connection detail. Drawings get stamped by the PE, filed with Seattle DCI through the city's plan-review portal, and held in plan-review queue for typically 3 to 5 weeks. We follow up weekly and update you on permit status. Once issued, the permit comes back with any plan-review comments addressed and we are clear to break ground.
Footings, Engineered Posts, LVL or Laminated PT Beams
Helical piles install via a helical contractor (Handis-coordinated, scheduled to the day) on hillside, fill-soil, or any lot where the engineer specifies them — the steel pile threads down to engineered bearing capacity (typically 9 to 14 feet on Seattle hillside lots) and the deck loads transfer through the pile cap to the bearing soil far below the surface fill. Concrete piers go in on stable native soil, hand-dug or auger-bored to 4 to 6 feet below grade, poured with 3,000 PSI mix, with 7-day cure before the frame loads. Posts (6x6 PT minimum on most multi-level builds, larger on long spans per engineer) sit on Simpson PB66 or equivalent engineered post-base hardware bolted to the footings — never set in concrete, which traps moisture against the post end-grain and rots it from the inside out within 8 to 12 years. LVL or laminated PT beams span between posts with stamped column connections.
Joist Frame, Ledger Through-Bolted with Continuous Flashing, Stepped Landings
Joists install in pressure-treated 2x at the engineer-specified size and spacing — typically 2x10 at 16-inch on center for face-fastened lumber, 2x10 at 12-inch on center for hidden-fastener composite or PVC. Ledger gets through-bolted to the rim joist or foundation with code-stamped LedgerLOK or FastenMaster bolts every 16 inches; full continuous metal flashing ties into the house siding above the ledger; a peel-and-stick waterproof membrane runs below the ledger and onto the joist top. Stepped landings between levels frame at the spec'd height drops (typically 12 to 18 inches between levels for a walkable transition, deeper for a major elevation change). Stair stringers cut from PT 2x12 at the code-spec 7-inch maximum riser and 11-inch minimum tread.
Decking, Code-Compliant Guardrails, Graspable Handrails on Every Stair Flight
Decking installs in the homeowner's selected material (cedar, PT, capped composite, cellular PVC, tropical hardwood — each with its own fastener and gap discipline). Code-compliant guardrails on every elevated level at 36-inch minimum height; no spheres greater than 4 inches anywhere through balusters; no spheres greater than 6 inches at the bottom of stair balusters (the 4-vs-6 inch trick is one that DCI inspectors check carefully). Graspable handrails (1.25 to 2-inch diameter, returns at every end) on every stair flight with more than three risers. Low-voltage stair-riser lights and post-cap lights run through the joist bays during framing; the licensed electrician adds any new line-voltage circuit needed for the lighting transformer or accessory loads.
How the Multi-Level / Elevated Deck Build Works
Six sequential phases from elevation survey through final Seattle DCI inspection — the actual working sequence we run on every multi-level deck more than 30 inches above grade, with structural engineering and the permit integrated into the timeline.
Site Survey, Soil Probe, Engineering Trigger Confirmation
Estimate visit takes elevation readings at every footing position with a laser level, hand-augers a soil probe at every position (not just one or two — Seattle yards transition from native till to fill within a single lot), photographs the ledger zone, and confirms the deck triggers structural engineering and a Seattle DCI permit. We name the licensed Washington PE on the quote and the engineering fee as a pass-through line item, no markup.
Structural Drawings Stamped + Permit Filed
The licensed Washington PE develops the structural drawings (footing schedule, beam sizing, post sizing, joist spacing, ledger detail, railing connection detail), stamps the drawings, and we file with Seattle DCI through the city plan-review portal. Plan-review queue is typically 3 to 5 weeks. We follow up weekly and update you on permit status. Once issued we are clear to break ground.
Tear-Down (if rebuild), Helical Piles or Concrete Piers, 7-Day Cure
On a rebuild we demolish the existing deck and haul the debris. Helical piles install via the helical contractor on hillside or fill-soil lots — steel threading 9 to 14 feet down to engineered bearing capacity; no curing wait. Concrete piers hand-dug or auger-bored to 4 to 6 feet below frost line on stable native soil, poured with 3,000 PSI mix, 7-day cure before loading. Engineered post-base hardware (Simpson PB66 or equivalent) bolted to every footing.
6x6 PT Posts on Engineered Hardware, LVL or Laminated PT Beams
Posts (6x6 PT minimum, larger per engineer on long spans) set on Simpson PB66 or equivalent engineered post-base hardware bolted to the footings — never set in concrete, which traps moisture against the post end-grain and rots from the inside out within 8 to 12 years. LVL or laminated pressure-treated beams span between posts with stamped column connections. Beam-to-post connection per the engineer's detail.
Ledger with Continuous Flashing + PT 2x Joists + Stepped Landings
Ledger through-bolted with code-stamped LedgerLOK or FastenMaster bolts every 16 inches into the rim joist or foundation. Full continuous metal flashing tied into the house siding above; peel-and-stick membrane below. PT 2x10 joists at 16-inch on center for face-fastened lumber, 12-inch on center for hidden-fastener composite or PVC. Stepped landings frame at the spec'd height drops (12 to 18 inches between levels for a walkable transition). Stair stringers cut from PT 2x12 at 7-inch maximum riser and 11-inch minimum tread.
Decking + Code-Compliant Guardrails + Graspable Handrails + Lighting + Final Inspection
Decking installs in the homeowner-selected material with its specific fastener and gap discipline. Guardrails at 36-inch minimum height on every elevated level — no spheres greater than 4 inches through balusters anywhere. Graspable handrails on every stair flight with more than three risers (1.25 to 2-inch diameter, returns at every end). Low-voltage lighting installed during framing; licensed electrician adds any new line-voltage circuit. Final Seattle DCI inspection scheduled by Handis as permit holder; we walk the deck with you and hand off the permit copy, engineer's drawings, and warranty paperwork.
Multi-Level / Elevated Deck Pricing
Final pricing depends on number of levels, total square footage, elevation above grade (which drives footing depth and beam sizing), decking material selection (cedar and PT are the most affordable; tropical hardwood and PVC are the premium), railing system, and integrated lighting scope. Seattle DCI building permit fee and licensed Washington PE structural engineering pass through as named line items on the quote, not as surprise add-ons. The licensed Washington L&I electrician's portion (for any new line-voltage circuit) is also named line by line. Helical pile contractor fees pass through where helicals are specified by the engineer. Request a free in-home estimate for an accurate quote.
Send us back-yard photos with elevation context (the drop from house to back-yard line), the level count you are considering, and the decking material — we will quote the build including permit, engineering, and helical pile pass-through.
Why Seattle Homeowners Book Handis for Multi-Level Elevated Decks
The multi-level decks we are called to repair or demolish almost always fail at one of three connections — the ledger to the house (un-flashed, water tracked behind it and rotted the rim joist), the post to the footing (the original builder set the post in concrete and the end-grain rotted out from the inside), or the guardrail post to the joist (the original builder used four lag screws into a 2x10 joist and the post pulled out at year 8 under a side load). Handis treats every one of these as a non-negotiable line item — full continuous metal flashing tied into siding above and membrane below at every ledger, engineered post-base hardware (Simpson PB66 or equivalent) bolted to the footing on every post with no post-in-concrete shortcuts, and guardrail post connections per the engineer's stamped detail with the bolted-through-rim hardware (Simpson DTT2Z or equivalent tension tie) on every post. The visible deck surface is the cosmetic layer; the engineered connections to the house and to the ground are the deck.
Permit pulled by Handis as general contractor, named on the quote
Decks more than 30 inches above grade at any point require a Seattle DCI building permit and a structural engineering stamp from a licensed Washington PE. Handis pulls the permit as general contractor under our contractor license, coordinates the engineer, and both fees pass through on the quote as named line items so you see exactly what the engineer and the permit cost — no markup, no hidden margin, no surprises three weeks into the project. We file the permit application the day we sign and update you weekly on plan-review status until the permit issues. If your deck is under 30 inches above grade and does not trigger the permit, we say so on the estimate visit and quote it without the engineering line item.
Hand-auger soil probe at every footing, helical or concrete sized to engineer's schedule
Seattle yards routinely transition from native till to old fill within the same lot, and the bearing capacity changes by a factor of three or four within a few feet. Builders who probe one corner of the build, find firm soil, and assume the rest matches are the source of most of the post-settlement failures we are called to demolish. Handis hand-augers a soil probe at every footing location, not just one corner. The engineer's footing schedule on a multi-level deck names each footing individually with its sizing per the soil at that location. On hillside or fill-soil lots, helical piles thread through the soft surface and bear on engineered capacity 9 to 14 feet down. On stable native soil, concrete piers below frost line are the appropriate footing. The engineer makes the call per location.
Posts on engineered post-base hardware, never set in concrete
A post set directly in poured concrete (still a common shortcut on builder-grade decks) traps moisture against the post end-grain and rots the post from the inside out within 8 to 12 years — invisible from the surface until the deck starts sinking. Handis sets every post on engineered post-base hardware (Simpson PB66 or equivalent) bolted to the footing, with a small air gap between the post end and the concrete. The post drains, the end-grain stays dry, and the connection performs for the life of the deck. We do this on every multi-level build regardless of code minimum because the post-in-concrete failure mode is a well-documented PNW reality and we have demolished too many decks where it happened.
Full continuous metal ledger flashing, photo-documented at install
The single most common deck failure in the Pacific Northwest is the rim joist rotting behind a ledger that was never properly flashed. Continuous metal flashing tied into the house siding above the ledger and a peel-and-stick waterproof membrane below it, with the membrane wrapping over the joist top — the assembly that keeps any water finding its way behind the siding tracking out over the deck rather than down into the rim joist. We do this on every elevated deck and we photograph the assembly before the boards close it in. The photo goes in the permit file and your file. The flashing detail is what the engineer's drawing calls out; it is also the difference between a deck that lasts 25 years and one that fails at year 12.
Insured, background-checked, 30-day workmanship + 2-year structural warranty
Every Handis carpenter carries liability insurance and has cleared a background screening before the first job. The 30-day workmanship guarantee covers any fastener that loosens, any picture-frame miter that opens, and any cosmetic finish. The structural framing (footings, beams, joists, ledger, posts, railing connections) carries our 2-year workmanship warranty on installation, separate from any decking-material warranty. The licensed Washington L&I electrician warrants their portion under their own license terms; the licensed PE's stamp is on the drawings in the permit file as the engineering-quality guarantee. All warranties in writing at project close.
Estimate
Tell us the lot context (sloped or flat, house elevation at the back wall, back-yard line elevation), the level count you are considering (two levels with a stepped landing is most common; three levels for a steeper lot), the total square footage you have in mind, the decking material (cedar, PT, composite, PVC, hardwood), the railing preference (PVC-and-aluminum, powder-coated aluminum panel, stainless cable, custom hardwood), and any add-ons you want priced (integrated lighting on every stair flight, built-in bench, planter, hot tub area). We send back a clear estimate with the permit, engineering, and helical pile pass-through named line by line and a project timeline including the 4 to 6-week permit and engineering review.
Customer Reviews
Multi-level elevated deck construction reviews from real Seattle-area Handis customers.
1922 Capitol Hill craftsman, back yard sloped 4 feet from house to back property line. We wanted a two-level deck off the second-story kitchen door with a stepped landing down to a lower-level dining platform six steps below. Handis pulled the permit as general contractor, coordinated the licensed PE on the engineering (the engineering fee was named on the quote at $2,400 and came in at $2,200), and the soils engineer recommended helical piles because the back yard was on old fill. Eight working weeks on site after the permit issued; the deck has stood through three winters with zero settlement. The PVC fascia at the stepped transition between levels is the cleanest carpentry detail I have seen.
Three-level composite build on a Queen Anne lot with serious vertical drop — 12 feet from upper deck to lower deck across three levels with stair flights between each. Engineering took 4 weeks before we broke ground, permit took another 3 weeks after the engineer stamped. The licensed PE actually came to the site for one inspection during framing to verify the cantilevered upper level was framed to his drawing. Nine working weeks. The cable rail across all three levels gives us the view we built for; the stair-riser lighting on every flight makes evening use safe for our older guests.
We had two other contractors quote this build and one of them did not even mention the engineering or the permit as separate line items — just bid a single number for the whole project. Handis broke out the engineering fee ($2,400 pass-through), the permit fee ($1,100 pass-through), and the helical pile contractor cost ($6,800 across eight piles at $850 each) as transparent named lines on the quote. Total came in at $52,000 for a two-level 450 square-foot composite deck with cable rail and integrated lighting. No surprises in the middle. Worth shopping multiple bids just for the quoting transparency Handis delivered.
1958 Magnolia rambler, the back yard had a 6-foot drop from the house pad to the lower-yard grade. We wanted the upper deck at house level, a 6-step stair flight, and a lower dining platform — three levels of vertical structure on a relatively small footprint. Handis ran 8 helical piles for the post footings (the geotechnical report recommended helicals because of the fill behind the original house pad), framed in PT 2x10 at 12-inch OC for the hidden-fastener PVC, and set the guardrails on bolted-through-rim Simpson DTT2Z tension ties per the engineer's detail. Seven working weeks. Permit inspection passed first try.
Tropical hardwood (Cumaru) on a two-level Madrona view deck, 480 square feet total. The engineer on the project was specific about the higher dead load on hardwood vs cedar and called for 2x10 at 12-inch OC and upsized two beams. Handis included the 1.5-week board acclimation in the schedule from the start. Eight working weeks of on-site build plus 5 weeks of permit and engineering before we broke ground. The lower level has a built-in Cumaru bench around the perimeter that doubles as the railing transition. Three years in and it looks identical to install day.
Frequently Asked Questions
Common questions about multi-level and elevated deck construction — pricing, permits, engineering, helical piles, ledger flashing, and what to expect on a Handis build.