Cedar, Composite & What Holds Up in Seattle’s Climate

The fence material that performs best in the Seattle area depends on your budget, how much maintenance you’re willing to do, and whether you care more about how the fence looks at installation or how it looks in year ten. Western red cedar is the Pacific Northwest standard for good reason — it’s naturally rot-resistant, locally sourced, and weathers to a silver-gray that fits the landscape. But it requires periodic maintenance, and the quality of the cedar you buy matters enormously. Composite fencing has emerged as a low-maintenance alternative, though it costs more upfront and offers fewer design options. Pressure-treated lumber is the budget choice but warps badly in our wet-dry cycling. Vinyl lasts but looks like vinyl. Metal works for modern properties but offers no privacy. After 15 years of building fences across Kirkland, Redmond, Bellevue, and Sammamish, here’s what we’ve seen hold up — and what we’ve had to replace early.

Western red cedar dominates residential fencing from Seattle to Monroe for reasons that go beyond tradition. The wood contains natural oils — thujaplicins — that resist rot, decay, and insect damage without chemical treatment. It’s dimensionally stable, meaning it swells and shrinks less than other softwoods when exposed to our wet winters and dry summers. And it’s locally available: mills across Washington and British Columbia process cedar specifically for the fencing market, which keeps material costs lower than they’d be for an imported hardwood with similar properties.

The aesthetic matters too. Fresh cedar has a warm reddish-brown tone that no manufactured product has convincingly replicated. Left untreated, it weathers to a silver-gray over two to four years — a look that many Eastside homeowners actually prefer because it blends with the mature Douglas fir and western hemlock canopy that characterizes neighborhoods from Woodinville through Issaquah.

If you want to maintain the original warm tone, you’ll need to apply a UV-resistant semi-transparent stain every two to three years. In our experience, oil-based penetrating stains outperform film-forming products in this climate because they allow moisture to move through the wood rather than trapping it beneath a surface coating. A film-forming finish — the kind that sits on top of the grain — will peel and blister within a couple of seasons once our winter rains find a crack in the coating.

Not all cedar is equal, and the grade you choose has a significant impact on both appearance and longevity. This is where we see homeowners run into trouble: a contractor quotes “cedar fencing” without specifying the grade, and the homeowner assumes they’re getting top-quality material.

#1 Grade (Clear or “A” Grade): Virtually knot-free, tight grain, minimal sapwood. This is the premium product — consistent appearance across every board, and the heartwood-dominant composition means maximum natural rot resistance. Expect to pay $8-$12 per linear foot for materials alone in the Seattle market (2026 pricing). We use this grade on properties where the fence is a prominent visual element — front yard fences in Kirkland, courtyard enclosures in Bellevue, anywhere the homeowner will see the fence up close every day.

#2 Grade: Some tight knots, more grain variation, occasional sapwood streaks. This is the most common grade for residential privacy fences. The structural performance is identical to #1 — the knots in #2 cedar are tight (not loose or falling out) and don’t compromise the board’s integrity. Expect $5-$8 per linear foot for materials. For a standard 6-foot privacy fence where the primary goal is function and the fence sits along a property line rather than as an architectural feature, #2 is what we install most often.

Tight-Knot (STK or “Knotty”): More and larger knots, more sapwood, more character variation. This is the economy cedar option at $4-$6 per linear foot for materials. The trade-off is that sapwood doesn’t contain the same concentration of rot-resistant oils as heartwood, so boards with significant sapwood content will deteriorate faster in our climate — particularly the bottom 12 inches where the fence contacts soil moisture and splash-back.

We replaced a fence in Woodinville last year where the grade difference was visible on the same fence. The homeowner had used STK-grade cedar throughout, and after about 8 years, the bottom 18 inches of the boards — the section exposed to splash-back and soil moisture — had visibly deteriorated on the boards with heavy sapwood content. You could see the pattern clearly: boards with mostly heartwood (the darker, reddish-brown wood) were solid and firm. Boards with significant sapwood streaks (the lighter, cream-colored wood) were soft, splitting, and showing surface rot. The upper portions of the same boards were fine — the sapwood issue only manifested where moisture contact was consistent. The replacement used #2 grade with better heartwood content on the lower courses, and we elevated the bottom rail 2 inches above grade to eliminate soil contact entirely.

For a standard 6-foot dog-eared privacy fence using #2 grade cedar with 4×4 posts set in concrete, our installed cost typically runs $35-$55 per linear foot across the Eastside (2026 pricing). That includes posts, rails, pickets, concrete, hardware, and labor. A 150-linear-foot perimeter fence — a typical three-sided backyard enclosure on a quarter-acre lot — lands between $5,250 and $8,250.

The range depends on several factors: grade of cedar, post spacing (6-foot vs. 8-foot centers), terrain complexity (a flat lot in Kenmore vs. a sloped property in Sammamish), and how many gates are included. Cap-and-trim style fences with a top rail and trim boards add $8-$15 per linear foot over a basic dog-eared design. Horizontal board fences — which have become increasingly popular on modern and mid-century properties across the Eastside — cost more because they require tighter post spacing (typically 4-6 foot centers) to prevent the boards from bowing between posts.

A recent Kirkland project provides a good reference: 180 linear feet of 6-foot privacy fence using #2 grade cedar in a horizontal board design with a cap rail and 4×6 posts on 6-foot centers. The property had a gentle slope along one side that required stepped panels rather than racked (angled) panels — an aesthetic choice that adds some labor. Two 4-foot gates were included. Total installed cost came to approximately $10,800, or about $60 per linear foot. A standard dog-eared vertical board fence of the same length on a flat lot would have been closer to $8,100 ($45 per linear foot) — the horizontal design, cap rail, and stepped panels each add cost.

Composite fencing uses a blend of wood fibers and plastic polymers — the same basic technology as composite decking brands like Trex, TimberTech, and Fiberon. The pitch is straightforward: higher upfront cost, virtually zero maintenance, and a lifespan that exceeds cedar by a decade or more.

The reality is more nuanced than the marketing suggests.

Composite doesn’t rot. It won’t split, warp, or crack from moisture cycling. It doesn’t need staining, sealing, or painting — ever. In a climate where untreated wood is assaulted by eight months of rain followed by two months of dry heat, that durability advantage is real. We’ve installed composite privacy screens in Redmond that look essentially the same after eight years as they did at installation, with nothing more than an occasional pressure wash to remove algae.

The color holds, too. Unlike cedar, which will gray regardless of your preference unless you commit to biennial staining, composite maintains its manufactured color for the life of the product. Most manufacturers offer 25-year fade and stain warranties.

Style limitations. Composite fencing panels are manufactured in set configurations. You can’t custom-cut and fit them the way you can with individual cedar boards. If your property line jogs around trees, follows an irregular grade, or requires non-standard gate widths, composite becomes either impossible or prohibitively expensive to adapt. Cedar, by contrast, is just wood — our crews cut, fit, and notch it to accommodate any site condition.

Appearance. This is subjective, but we hear it consistently from homeowners: composite fencing looks manufactured. The texture is uniform in a way that real wood never is. On a property surrounded by mature conifers and native plantings, a composite fence can read as artificial in the same way that vinyl siding reads differently from painted wood clapboard. Some homeowners don’t mind. Others can’t unsee it.

Cost. Composite fencing typically runs $50-$80 per linear foot installed — roughly 50-70% more than an equivalent cedar fence. For a 150-foot perimeter, that’s $7,500 to $12,000 compared to $5,250 to $8,250 for cedar. The math on maintenance savings is real over a 25-year period, but the upfront premium is significant.

Heat retention. Dark-colored composite absorbs and retains heat. In our July and August dry periods, when afternoon temperatures push into the 80s and 90s, a south-facing composite fence can become noticeably hot to the touch. This is worth considering if the fence borders a play area, a dog run, or a planting bed where reflected heat could stress plants.

The most common composite fence issue we’ve seen in our climate is thermal expansion causing panel gaps. Composite materials expand and contract more than wood with temperature changes — a 6-foot composite panel can grow by 1/4 inch between a 35°F January morning and an 85°F August afternoon. If the installer doesn’t leave adequate expansion gaps at posts, the panels can buckle or bow between attachment points during summer heat. We’ve also seen color fading on darker composite fences that exceeds what the manufacturer’s warranty covers — the warranty typically defines “fade” as uniform color change, but UV exposure in our climate is uneven (the top rail fades faster than the lower sections shaded by landscaping), leaving a two-tone appearance after 5-7 years. The newer-generation capped composites (where a UV-resistant polymer shell wraps the core material) perform significantly better on both counts than the older uncapped products.

Pressure-treated (PT) lumber — typically hem-fir or southern yellow pine infused with preservatives under pressure — is the budget fence material. At $25-$40 per linear foot installed, it’s the lowest-cost option for a wood fence. And for many homeowners, that price advantage is the beginning and end of the conversation.

In our experience, pressure-treated fences in the Seattle area have a significantly shorter functional lifespan than cedar. The wood is dimensionally unstable: it absorbs moisture readily, swells during our wet season, then dries and shrinks during summer. That cycling causes warping, cupping, and twisting that shows up within the first two to three years — particularly in the pickets, which are the thinnest boards and have the least structural mass to resist movement.

The preservative treatment (typically micronized copper azole, or MCA, which replaced the older CCA formulation) protects against rot and insect damage, but it does nothing to prevent the physical warping. A pressure-treated fence in Kirkland that was straight and tight at installation will typically show noticeable gaps between pickets, bowed boards, and lifted nails by year three.

PT lumber also requires staining or painting to look decent — the raw greenish color isn’t what anyone wants as a permanent finish. But the wood needs to dry for three to six months before it will accept stain, which means you install it, look at a green fence through an entire season, and then stain. And then restain every two to three years.

Realistic lifespan in our climate: 10-15 years before significant structural deterioration — posts rotting at the ground line, rails splitting, pickets falling off. Cedar, by comparison, routinely lasts 15-25 years with minimal maintenance, and longer if maintained.

Where PT makes sense: Temporary fencing, utility enclosures, areas where the fence isn’t visible from the house, or when budget constraints make cedar genuinely unworkable. We don’t recommend it for primary perimeter fencing on homes where the fence is a significant visual element.

Vinyl fencing is the zero-maintenance option in the truest sense: no staining, no painting, no sealing, no rot. It washes clean with a hose. It doesn’t absorb moisture, so warping and swelling are non-issues. And modern vinyl has improved significantly — the chalky, obviously-plastic look of 1990s vinyl fencing has given way to more convincing textures and colors.

Cost: $30-$60 per linear foot installed, depending on style and height. Roughly comparable to mid-grade cedar.

Lifespan: 20-30 years. The material itself is essentially permanent, but UV exposure causes gradual brittleness over decades. We’ve seen 15-year-old vinyl fences in Shoreline and Kenmore where panels crack if struck by a fallen branch or a misdirected soccer ball — damage that wouldn’t crack fresh vinyl.

The honest trade-off: Vinyl looks like vinyl. It doesn’t develop patina, character, or the weathered texture that integrates a fence into a Pacific Northwest landscape. On a modern property with clean lines and manufactured siding, vinyl can fit the aesthetic. On a wooded property in Woodinville or a craftsman-style home in Bothell, it typically looks out of place. Vinyl is also difficult to repair — a damaged panel usually means replacing the entire section between posts, because panels are manufactured in set widths and interlock in ways that don’t allow partial replacement.

Environmental consideration: PVC manufacturing is energy-intensive and the material is not recyclable through standard municipal programs. For homeowners who prioritize sustainable material choices, this may be a factor.

Aluminum ornamental fencing — the modern version of wrought iron — provides visibility, defines property lines, and requires almost no maintenance. Powder-coated aluminum won’t rust, doesn’t need painting, and handles our wet climate without issue.

Cost: $30-$55 per linear foot installed for standard 4-foot ornamental panels. Taller panels (5-6 feet) run higher.

Where it works: Front yard boundary definition, pool enclosures (code-compliant options available), and properties where maintaining sight lines matters more than privacy. We use aluminum fencing around the perimeters of properties where the homeowner wants to contain a dog without blocking the view of mature landscaping.

The limitation: Metal fencing provides zero privacy. If your primary goal is screening — from neighbors, from road noise, from wind — metal fencing doesn’t accomplish it. Some homeowners pair aluminum fencing with a dense hedge planting (Portuguese laurel, skip laurel, or photinia are common choices in our area), which provides both the structural boundary and the privacy screen. But the hedge takes three to five years to fill in, and requires ongoing maintenance that the fence itself doesn’t.

We’re seeing more horizontal steel slat screens on contemporary homes in Bellevue and Redmond — particularly on properties with a modern or mid-century aesthetic where wood feels too traditional. Galvanized steel panels with a powder-coat finish (typically black or dark bronze) provide clean lines and excellent durability — a powder-coated steel fence won’t rot, warp, or need staining, and the 20-gauge steel panels resist impact better than aluminum. Aluminum is lighter and doesn’t rust, but it dents more easily and the thinner profiles can feel less substantial. The cost for steel panel fencing runs roughly $65-$90 per linear foot installed — more than cedar but competitive with high-end composite. The main trade-off is privacy: most steel slat designs have gaps between the horizontal members, so they’re more of a visual screen than a full privacy barrier. For properties where the goal is defining space and adding architectural character rather than blocking sightlines entirely, they’re a strong option that’s only gaining popularity.

Lifespan claims from manufacturers and contractors are marketing numbers. Here’s what we’ve actually observed across 15 years of fence installation and replacement in the Greater Seattle area:

| Material | Marketed Lifespan | What We Actually See | Key Failure Point | |———-|——————-|———————-|——————-| | Western red cedar (#1-#2) | 15-25 years | 15-25 years (accurate) | Posts at ground line, bottom 12″ of pickets | | Cedar (tight-knot/STK) | 15-20 years | 10-15 years | Sapwood sections rot faster, particularly bottom boards | | Composite | 25-50 years | 25-30+ years (too early for definitive data) | Panel connection hardware, not the material itself | | Pressure-treated | 15-20 years | 10-15 years | Posts at ground line, picket warping/splitting | | Vinyl (PVC) | 20-30+ years | 20-30 years (accurate for material, less for function) | UV-induced brittleness, panel cracking from impact | | Aluminum | 30+ years | 25-30+ years | Powder coating degradation at connection points |

The most common point of failure across every wood fence material — cedar and pressure-treated alike — is the post at the ground line. This is where moisture from the soil wicks up into the end grain, and where the soil-to-air interface creates ideal conditions for decay organisms. Setting posts in concrete actually accelerates this problem in our climate, because water pools at the top of the concrete collar and sits against the wood.

The better approach — and what we’ve moved to on most of our fence installations — is steel post brackets or concrete post bases that elevate the wood above the soil contact point. The upfront cost is slightly higher, but eliminating the ground-contact decay point can add five to ten years to the fence’s functional lifespan.

The system we’ve standardized on for most residential fence work is a galvanized steel post bracket set in concrete — products like the Simpson Strong-Tie ABU post bases or similar heavy-duty standoff brackets. The bracket gets embedded in a concrete footing during the pour, then the 4×4 or 4×6 post bolts into the bracket above grade. The wood post never contacts the ground or the concrete — there’s a 1-inch air gap between the bottom of the post and the concrete surface. This eliminates the primary rot point where moisture wicks up from the concrete-to-wood contact in a traditional direct-burial installation. The added cost runs about $15-$25 per post (bracket hardware plus slightly more labor for bolt attachment), which on a fence with posts every 6-8 feet adds roughly $2-$4 per linear foot to the total project cost. On a 150-foot fence, that’s $300-$600 — a modest investment that can extend the fence’s functional lifespan by 5-10 years by eliminating the most common failure point.

Fence regulations vary by city, but across Bellevue, Kirkland, Redmond, Sammamish, Issaquah, Woodinville, and most Eastside jurisdictions, the general framework is consistent:

• Backyard and side yard (behind the front building line): 6 feet maximum without a permit
• Front yard (ahead of the front building line): 4 feet maximum, and in some cities 3.5 feet
• Corner lots: Sight-triangle requirements at intersections restrict fence height (typically 3 feet) within a defined area near the corner to preserve driver visibility
• Setbacks: Most cities require fences to be built on your property, not on the property line itself. Bellevue requires a minimum of 6 inches from the property line for fences; other cities vary.

If you need a fence taller than 6 feet — for noise screening along a busy road, privacy from an elevated neighbor, or security — most cities allow it with a permit and sometimes a variance hearing. But the approval process adds cost and timeline, and some HOAs restrict fence heights and materials beyond what the municipal code allows.

A note about neighbor fence etiquette and Washington state law: Washington is a “good neighbor fence” state. RCW 16.60 addresses fence obligations primarily in the context of livestock, but the practical reality for residential properties is this: if a fence sits on the property line, both neighbors share responsibility for maintenance. If it sits entirely on your property, it’s entirely yours. Before installing a fence, we always recommend having a clear conversation with adjacent neighbors about the location, height, and “good side” orientation. The finished side of the fence traditionally faces the neighbor — but this is convention, not law. Many of our cap-and-trim and horizontal board fence designs look identical from both sides, which eliminates the issue entirely.

Two code surprises we encounter regularly: In Kirkland, fences in front yards are limited to 4 feet (6 feet in side and rear yards), but many homeowners don’t realize that corner lots have two “front yards” under the zoning code — the side facing the intersecting street is also considered a front yard, which drops the maximum height to 4 feet along that entire property line. We’ve seen homeowners build 6-foot fences along what they thought was a side yard, only to receive a code enforcement notice requiring them to cut the fence down to 4 feet.

In Sammamish, the standard 6-foot rear and side yard fence height applies in most zones, but properties within the Planned Area Development (PAD) zones — which cover large sections of the Plateau communities — often have CC&Rs that override city code. One homeowner in a Sammamish HOA wanted to replace an aging cedar fence with a modern horizontal design. The CC&Rs required “traditional wood fencing” and specifically prohibited horizontal board patterns. They ended up with a traditional vertical board fence with a cap rail — still an improvement, but not the look they’d envisioned. The lesson: check your CC&Rs before choosing a fence style, not after the materials have been ordered.

There’s no single right answer, but after building fences in every material across the Eastside, here’s how we think about the decision:

Choose western red cedar (#1 or #2) if you want a fence that looks like it belongs in the Pacific Northwest landscape, you’re comfortable with periodic staining (or you like the natural silver-gray weathering), and you value the ability to customize every detail — board width, spacing, cap style, gate design. This is what we install most often, and what we recommend for most residential privacy fences. See examples in our Carpentry & Fencing gallery.

Choose composite if you genuinely will not maintain a wood fence and you want a product that looks the same in year 15 as it does in year one. Be realistic about this — many homeowners say they won’t maintain the fence but then feel guilty about the gray weathering two years later. If you know yourself and maintenance isn’t happening, composite’s higher upfront cost pays off.

Choose pressure-treated if budget is the primary constraint and you understand you’re getting a 10-15 year product that will need staining and will warp. It’s a legitimate choice — just go in with clear expectations.

Choose vinyl if you want true zero-maintenance and the aesthetic works with your property’s style.

Choose aluminum or steel if privacy isn’t the goal and you want to maintain sight lines while defining your property boundary.

Whatever material you choose, the quality of the installation matters at least as much as the material itself. Post depth, hardware quality, rail connections, and drainage management at the post base are the details that separate a fence that lasts from one that doesn’t. If this is a decision you’re working through, we’re happy to walk your property and talk through the options specific to your site. You can reach us through our design-build consultation page or explore our approach to choosing materials for your Seattle landscape.