Blaine Exterior Why Two Similar-Looking Houses Get Very Different Quotes
Homeowners in Blaine often start their siding research by asking for a price per square foot, expecting a simple answer. There isn't one. Two houses of nearly identical size can land on very different numbers once a contractor actually gets on a ladder and looks at what's underneath the old siding, how the house is trimmed out, and what it will take to keep water out of the wall assembly once the new material goes up. The square footage sets a baseline. Everything else on this page is what moves the final number up or down from there.
This page walks through the real cost drivers in the order they usually surface during an estimate, so you can read a proposal and understand why it says what it says — instead of just comparing bottom-line totals between bids that may not be scoped the same way.
Condition of What's Underneath the Old Siding
This is the single biggest wildcard in any siding replacement, and it's the one homeowners can't fully see until the old material comes off. Whatcom County's wet winters mean a lot of homes have had years of moisture working behind siding that looked fine from the driveway.
What Contractors Look For Once Siding Is Off
- Soft or delaminating sheathing, especially at window and door corners and near the bottom few feet of walls
- Rusted or missing house wrap, or wrap that was installed with poor overlaps
- Rot at butt joints, inside corners, and anywhere old caulk was doing the job flashing should have done
- Insect or moisture damage around old deck ledger boards, hose bibs, and dryer vents
Sheathing repair, added house wrap, and rebuilding flashing details aren't upsells — they're the difference between siding that lasts and siding that traps the same moisture problem behind a new face. A contractor who quotes a number without ever opening a wall is guessing, and that guess usually turns into a change order mid-project.
Material Choice Changes the Whole Cost Structure
The siding product you choose doesn't just affect material cost — it changes labor time, trim requirements, finish life, and how the house performs against wind-driven rain off the Strait of Georgia. The table below is a general comparison, not a quote.
| Material | Relative Install Cost | Maintenance Demand | Coastal Moisture Performance | Factory Finish |
|---|---|---|---|---|
| Vinyl | Lower | Low, but fades and can warp | Prone to trapping moisture behind it if not detailed carefully | Color molded in, not sprayed; fades unevenly over time |
| Engineered wood (e.g. LP SmartSide) | Mid | Field-painted, needs repainting and caulk maintenance | Wood-based core; cut edges and joints need diligent sealing in wet climates | Factory primer only, not a full finish coat |
| Fiber cement (James Hardie) | Mid to higher | Low; factory finish holds color for years | Non-combustible, dimensionally stable, engineered for wet/coastal climates | ColorPlus baked-on factory finish with a dedicated finish warranty |
We install James Hardie exclusively, and this table is part of why. It's not that the other products are junk — vinyl and engineered wood siding both have a place in the market. It's that after years of tear-offs in this climate, we've seen which material category holds up with the least maintenance burden on the homeowner, and we'd rather stand behind one system we trust fully than split our warranty and installation expertise across several.
Installation Complexity and Labor
Material is often less than half the total cost. Labor — and specifically how much detail work the crew has to do — swings the number more than most homeowners expect.
What Adds Labor Time
- House shape: dormers, bump-outs, and multiple roof-wall intersections all mean more cutting, more flashing, and more trim than a simple rectangular footprint
- Story count and access: second- and third-story work requires scaffolding or lift access, which adds both cost and schedule time
- Trim detail: corner boards, window and door trim, frieze boards, and fascia detailing done correctly take real time to fit and caulk properly
- Tear-off vs. overlay: installing new siding over existing siding is sometimes done to cut cost, but it hides the sheathing entirely and is not something we do — you can't verify what you're covering up
Correct fiber cement installation also means proper fastener spacing, correct clearances at grade and roof lines, and factory-specified caulking and flashing at every joint. Cutting corners on any of these doesn't show up as a cost savings you can point to later — it shows up as a callback in a few years.
Water Management Details That Don't Show Up on a Simple Estimate
A siding job that's priced purely on "boards and labor" is missing the details that actually determine whether the wall stays dry. This is where a lot of low bids get their number down.
Flashing and Drainage
Proper installation includes flashing above windows and doors, kick-out flashing where roof lines meet walls, a drainage gap or rainscreen behind the siding in many applications, and weep points at the bottom of wall cavities. Skipping these doesn't save much labor time, but it's exactly what fails first in a climate with sustained fall and winter rain.
Caulk and Joint Treatment
Every seam, corner, and penetration is a place water can get behind the cladding. Manufacturer-specified sealants and joint treatments cost more than generic caulk and take longer to apply correctly, but they're a small fraction of the total job cost compared to what they protect.
How Blaine's Climate Factors Into the Price
Blaine sits right on the water, and that proximity to the Strait of Georgia and Semiahmoo Bay isn't just scenery — it's a cost factor. Salt-laden air accelerates corrosion on fasteners and metal flashing that aren't rated for coastal exposure, which is why we spec corrosion-resistant fasteners and flashing rather than whatever is cheapest at the supply house. Driving rain off the water pushes moisture into joints and laps that a drier inland climate would never stress the same way, which is part of why gap and lap details matter more here than they would in eastern Washington.
Whatcom County's long, damp shoulder seasons also mean a longer moss and algae season on north-facing walls and anywhere shaded by trees or a neighboring structure. Siding finish quality matters here — a factory-baked finish resists staining and holds color far longer than a field-applied paint job exposed to the same conditions, and that's a real, quantifiable difference in how a house looks five and ten years out.
Other Factors That Move the Final Number
| Factor | How It Affects Cost |
|---|---|
| Old siding disposal | Tear-off generates debris; disposal and dump fees are part of a complete quote, not an add-on later |
| Trim and accent color changes | Multiple colors or accent bands add cutting and coordination time versus a single body color |
| Window and door count | More openings mean more trim, flashing, and cutting per square foot of wall |
| Permit requirements | Varies by scope and whether other work (windows, structural repair) is bundled in |
| Timing/season | Contractors are often busier in the dry summer months, which can affect scheduling more than price |
What a Trustworthy Written Estimate Should Include
Whatever contractor you choose, insist on a written scope that spells out more than a total dollar figure. Use this as a checklist when comparing bids:
- Whether the quote includes full tear-off and sheathing inspection, or assumes the sheathing is sound
- The specific product line, thickness, and exposure/reveal being installed — not just "fiber cement" or "engineered wood"
- Whether flashing, house wrap, and fasteners are specified by brand and rated for coastal/moisture exposure
- Who handles disposal of old siding and any dump fees
- What the manufacturer's product warranty covers versus what the installer warranties separately
- A payment schedule tied to project milestones, not a large deposit upfront
A low number that's silent on these points usually means one of them isn't happening — not that the contractor found a way to do the same work for less.
Why We Quote One Product System
We install James Hardie fiber cement siding exclusively. We don't offer vinyl, LP SmartSide, or other engineered wood alternatives, and that's a deliberate standard, not a limitation we're apologizing for. Standardizing on one system means our crews install it the same correct way on every job, our warranty conversations are simple because there's only one manufacturer's terms to know inside and out, and every estimate we write is built around a product we've watched perform through Whatcom County winters rather than a product we're hoping performs well. It also means our pricing is more predictable — we're not juggling different labor assumptions, flashing details, and warranty structures across multiple product lines.
Getting a Real Number for Your Home
The only way to get an accurate cost for your specific house is to have someone look at it — the roofline, the trim detail, the current siding condition, and what's likely underneath it. We're happy to walk your property, give you a straight answer about what we find, and put together a written estimate with no pressure to sign anything on the spot.