James Hardie siding sits at the higher end of common residential siding options, and homeowners deserve an honest explanation of why — not a made-up number pulled from a national online calculator that has no idea what your house actually looks like. This guide walks through the real cost drivers for a Southwest Washington James Hardie project, framed as ranges, not a quote.
Every project we price starts with an in-home assessment of your specific home — square footage, existing siding condition, trim complexity, and access — because a generic per-square-foot number can be wildly misleading on two homes that look similar from the street but differ enormously in scope once the tear-off starts.
We also think it's worth being upfront that a lower bid isn't automatically a better value. A proposal that leaves out proper flashing, a rain-screen assembly, or zone-correct product to hit a lower number is pricing a different, lower-durability project than one that includes those details as standard — and the gap tends to show up years later as a repair bill, not at signing.
We don't publish a per-square-foot number here because it varies too much project to project to be honest — a fixed-price proposal after an in-home assessment is the only number worth trusting.
Tear-off vs. install over existing siding
Removing existing siding down to the sheathing (often necessary to properly install a rain-screen assembly and inspect for hidden rot) adds labor compared with limited scenarios where new siding can go over sound existing material.
Trim and architectural complexity
Homes with extensive trim, multiple gables, dormers, or architectural detailing take meaningfully more labor per square foot than a simple, boxy elevation.
Story height and access
Multi-story homes and homes with limited access (steep lots, tight side yards) require more staging, scaffolding, or lift equipment, which affects labor cost.
Product line and profile
HardiePlank lap siding, HardiePanel vertical siding, and the premium Artisan or Architectural Panel lines carry different material costs, as does the choice between primed (field-painted) and factory ColorPlus prefinished siding.
Repair scope uncovered during tear-off
Rot repair, sheathing replacement, or flashing correction found once old siding comes off is common on older homes and adds to the original scope — we flag this as a possibility upfront, not a surprise change order.
Rain-screen assembly
Furring strips, drainage plane detailing, and the added flashing that go into a properly drained and vented wall assembly are part of our standard scope, not an optional add-on, which is worth understanding when comparing a proposal against a bare per-square-foot estimate that skips this step.
Washington state sales tax applies to both labor and materials on remodeling projects like a siding replacement — a meaningful difference from states that only tax materials, and worth building into your budget expectations from the start. The applicable rate is Clark County's combined state and local rate, which we confirm and include transparently in every written proposal rather than adding as a surprise line item later.
This is a real cost factor, not boilerplate: on a full-home siding replacement, sales tax on labor and materials is a meaningful ballpark addition to the project total, and it's one reason a Southwest Washington quote can run higher than a bare materials-only estimate found online might suggest.
Unlike many states, Washington taxes remodeling labor as well as materials — we itemize Clark County's combined rate in every written proposal so the total is never a surprise.
James Hardie's higher upfront cost is generally weighed against a longer service life, lower long-term maintenance (no repainting on a ColorPlus-finished product for many years), and strong resale positioning compared with vinyl siding on a comparable home. Whether that trade-off is worth it depends on how long you plan to own the home and how much you value avoiding a repaint cycle every several years.
We don't promise a specific return on a siding investment — real estate value depends on far more than exterior material — but the durability and reduced-maintenance case for fiber cement in a climate like ours is well documented by the manufacturer and independent building-science research alike. We're happy to walk through the honest trade-offs for your specific home and timeline.