Lynden "What does new siding cost?" is one of the first questions we get, and it's a fair one — siding is a major investment, and most homeowners have no way to judge whether a bid is reasonable. The honest answer is that siding replacement cost isn't really about the siding. It's about everything underneath it, and that's where estimates for the same house can vary by thousands of dollars.
Why There's No Simple Per-Square-Foot Number
You'll find plenty of national average ranges online, but they're not very useful for a Whatcom County home. A quote depends on your specific house — its size, stories, roofline complexity, trim detail, and, critically, what your crew finds once the old siding comes off. A contractor who hasn't seen your walls can only give you a rough placeholder, not a real number.
The Cost Factors That Actually Move the Number
- Tear-off vs. overlay. Removing old siding down to the sheathing costs more up front than installing over existing material, but it's the only way to inspect and fix what's underneath. Overlaying hides problems instead of solving them.
- What's behind the wall. Rot, soft sheathing, and failed old flashing are common on homes that have weathered years of Lynden's wet winters. You won't know the extent until the walls are open, which is why a firm price before demo is often a guess dressed up as a quote.
- Water management details. Proper house wrap, flashing at every window and door, kick-out flashing where rooflines meet walls, and correct overlaps at seams take more labor time than a fast, sealant-heavy installation. This is usually where corners get cut, and it's the single biggest factor in whether siding lasts 10 years or 40.
- House shape and trim. Dormers, multiple gables, lots of window and door trim, and tall walls all add labor hours. A simple rectangular one-story home costs less to side than a home with the same square footage but a complex roofline.
- Product choice. Vinyl, engineered wood, fiber cement, and cedar all price differently, and within each category there's a range depending on the line, profile, and factory finish. Material cost is real, but on most jobs it's a smaller share of the total bid than people expect — labor and water management usually cost more than the siding itself.
- Access and site conditions. Multi-story walls, tight lot lines, and landscaping that has to be protected or moved all add time.
Why Low Bids Are Often Missing Something
When two bids for the same house are far apart, the gap is almost always in scope, not profit margin. A lower bid may skip full tear-off, use fewer flashing details, install over damaged sheathing without disclosing it, or spec a thinner or lower-grade product line. On the Whatcom County coast, where salt air and driving rain hit walls hard, those shortcuts show up early — as paint failure, soft trim, or siding that has to be redone within a decade instead of lasting a generation. A cheaper bid that has to be repeated in 12 years isn't actually cheaper.
Cost Per Year, Not Just Cost Per Job
The more useful way to compare siding options isn't the upfront number alone — it's what that number buys in years of service and how much maintenance it demands along the way. A product that costs more installed but needs no repainting, resists moisture well, and holds its finish through Lynden's long moss season can cost less per year of ownership than a cheaper product that needs recaulking, spot repairs, or a full repaint within a decade. This is a big part of why we standardized on James Hardie fiber cement: it's non-combustible, engineered for wet Pacific Northwest climates, and finished with a factory ColorPlus coating backed by a strong transferable warranty — so the total cost of owning it, not just installing it, tends to come out ahead.
What to Ask For in a Bid
| Ask about | Why it matters |
|---|---|
| Full tear-off vs. overlay | Determines whether hidden damage gets found and fixed |
| Flashing and house wrap details | Drives how well the wall handles wind-driven rain |
| Product line and profile, in writing | Prevents a bait-and-switch to a cheaper spec |
| Warranty terms — material and labor | Shows what happens if something fails early |
| Allowance for rot repair | Sets expectations before demo, not after |
Get a Real Number for Your House
The only way to get an accurate figure is to have someone look at your actual walls, trim, and roofline in person. We're glad to walk your Lynden home, explain what we see, and put together a straightforward, no-pressure estimate — no inflated numbers, no vague allowances. Fill out the form below and we'll get you scheduled.