Douglas Fir vs Oak in an Older Seattle Craftsman Home

Walk from the dining room to the back hallway in an older Seattle Craftsman and you may cross a border between two different trees — often without noticing, because both floors have spent decades under the same ambered finish. Builders of that era used oak where guests would look and Douglas fir everywhere else: fir was the Northwest’s own lumber, cut nearby and cheap, while oak arrived by rail and cost accordingly. A hundred years later, the budget wood and the show wood have both become irreplaceable — and they still need different handling when refinishing time comes.

This is the head-to-head: how to tell which wood you’re standing on, what the hardness gap means for daily life, why they sand and finish differently, and how to handle the house that has both. (For the whole-house restoration story — thickness checks, repairs, what a century leaves behind — see our 1920s Seattle bungalow guide; this post is about the wood itself.)

Ten-Second Identification: Which Wood Is This?

You don’t need a lab. Look at the grain. Oak has open pores you can see (sometimes feel), flecks and rays in the surface, and often a flame-shaped “cathedral” pattern down the board. Douglas fir is the opposite: smooth, pore-less surface with straight, tightly spaced parallel grain lines — old vertical-grain fir looks like the edge of a closed book. Color helps too, once finish is off: red oak leans pink-tan, white oak grayish-brown, fir a warm honey that deepens to rose-orange with sun and years. And location is the strongest hint of all in a Craftsman: formal rooms up front are usually oak, everything behind the swinging door is usually fir.

If your oak-vs-oak question is red versus white, that’s a separate comparison we’ve already written — red oak vs white oak. In Craftsman-era Seattle homes, the front-room oak is most often red oak, sometimes quarter-sawn white oak in the grander houses.

What the Hardness Gap Actually Means

The Janka scale puts numbers on what your floor already knows: red oak sits at 1290, white oak around 1360, and Douglas fir at 660 — half as resistant to denting. In practice, oak shrugs off most of daily life and records only the greatest hits: dropped cast iron, stiletto heels, the piano move. Fir records more of the everyday — chair legs, dog nails, gravel in a boot tread — and a century-old fir floor wears those marks by the thousand.

Here’s the reframe we offer at estimates, honestly: on a hundred-year-old floor, that softness reads as patina, not damage. Old-growth fir has growth rings far tighter than anything milled today, which makes it tougher than its Janka number suggests and gives the wear an even, burnished character — closer to a farmhouse table than a scratched countertop. If you want a floor that hides evidence, oak is genuinely the better tool. If you want the house’s history visible underfoot, fir was never a downgrade.

Under the Sander: Two Different Animals

Oak is the wood sanding equipment was effectively designed around: dense enough to cut evenly, forgiving of grit choices, hard to ruin. Fir is the opposite temperament — so soft that an aggressive cut or a moment’s hesitation with a drum sander digs a trench, and its dramatic earlywood/latewood bands can wash out into ripples under careless abrasion. Sanding fir well means lighter passes, finer grit progressions, and machines that flatten rather than gouge — our Lägler TRIO’s three-disc final pass earns its keep on fir more than anywhere else. This, bluntly, is why rental-sander weekends end badly on fir floors more than any other wood in Seattle.

The payoff for care is outsized: freshly sanded vertical-grain fir, with its tight stripes running room to room, is one of the best-looking floors in the Pacific Northwest, full stop. We wrote a whole field guide on it — refinishing fir floors in old Seattle homes — because the wood deserves the specialization.

Color and Finish: Where the Two Woods Part Ways Completely

Oak accepts stain the way it accepts everything else — evenly and on command. Natural, honey, mid-brown, espresso: the front rooms of a Craftsman can be any of them, and our stain color guide walks that decision. Fir mostly refuses. Its density flips between growth bands, so pigment grabs unevenly and the result blotches — the classic failed experiment is a fir hallway someone tried to stain to match the oak dining room. Our standing advice: stain the oak if you like, keep the fir natural, and let each wood be excellent at what it is.

Finish chemistry matters double on fir. Oil-modified poly ambering on red oak reads traditional; the same amber stacked on fir’s already-warm tone lands at pumpkin, and it keeps going for years. A clear waterborne — the Bona and Pallmann systems we run, 2–3 coats — holds fir at its true honey and keeps oak’s stain the color you chose. The full argument is in water-based vs oil-based, but for fir it isn’t close.

The Seattle House With Both — and How We Handle It

This split floor plan is everywhere in Seattle’s Craftsman neighborhoods — Wallingford, Ballard, Queen Anne, West Seattle — and it raises the question every owner asks: “can you make them match?” The honest answer is no, and you shouldn’t want us to. Fir cannot convincingly impersonate oak, and staining it toward oak produces the blotchy hallway from the previous section. What a good refinish does instead is make them agree: both woods sanded fresh in the same job, one clear finish system across the whole floor, one sheen — and the doorway between them reads as intentional, the way the builder meant it. The oak looks like oak, the fir looks like fir, and the house looks like a Craftsman instead of a compromise.

Both woods carry the same pricing — $3.99/sq ft natural, $6.50 where the oak takes stain — and a whole-main-floor project runs the usual 3–5 days. These mixed-wood houses are core territory for our hardwood floor refinishing in Seattle, and after a decade of them, the doorway seam between fir and oak is a detail we’ve stopped being surprised by and started planning around.

Which Wood Wins? Depends on the Question

Related reading: Refinishing fir floors in old Seattle homes · Red oak vs white oak · Refinishing a 1920s Seattle bungalow · Hardwood floor refinishing in Seattle · Book a free estimate