6 min read · Cost
'What does siding cost per square foot?' is the most-asked California pricing question. The answer is more nuanced than a single number — here's the honest breakdown.
Floor area vs. wall area
Most homeowners ask 'cost per square foot' meaning floor area. Contractors price per square foot of wall area. The two aren't directly comparable. Floor area to wall area conversion: single-story typically 70-90%; two-story 90-115% of floor area. Get the conversion right or you mis-estimate substantially.
Vinyl cost per sq ft of wall — California valley
Vinyl installed in California valley: $6-$13 per sq ft of wall. Lower end (budget tract refresh) to upper end (better vinyl line with full prep). On WUI parcels: not Chapter 7A-acceptable; doesn't apply.
Engineered wood (LP SmartSide) cost per sq ft
LP SmartSide installed in California valley: $10-$17 per sq ft. Foothill non-WUI: $12-$20. Bay/Wine: $12-$22. Not Chapter 7A-acceptable on designated parcels.
Fiber cement (Hardie) cost per sq ft
Hardie ColorPlus in California valley: $12-$22 per sq ft. Foothill WUI-hardened: $15-$26. Tahoe (snow + WUI): $18-$29. Bay/Wine: $14-$24. Premium custom adds 15-30% to base tier.
Why per-square-foot varies so much within material
Substrate condition (sound vs. rotten). Architectural complexity (simple vs. custom trim). Stories and access (single vs. two-story). Region (valley vs. coastal). HOA approval and city permit cost. Each can move the per-foot price within a wide range.
Where per-square-foot pricing hides the truth
A 'per-square-foot' quote without itemized scope can hide: substrate-repair allowance (or lack of), WRB spec, flashing detail, fastener spec, trim itemization. Per-foot alone doesn't tell you what you're buying.
Comparing per-square-foot quotes fairly
Insist on itemized scope on each quote. Verify wall area calculation matches between contractors. Compare line-by-line scope rather than total per-foot. The right contractor isn't always the lowest per-foot — it's the one with strongest scope at fair per-foot.
Per-square-foot vs. project total
Per-foot is useful for cross-referencing. Project total is what matters for budget. Don't sign per-foot agreement — sign itemized project total based on agreed scope.
California siding cost per sq ft of wall by material and tier
| Material × Tier | Per sq ft of wall |
|---|---|
| Vinyl valley | $6-$13 |
| Engineered wood valley | $10-$17 |
| Hardie ColorPlus valley | $12-$22 |
| Hardie foothill WUI | $15-$26 |
| Hardie Tahoe snow + WUI | $18-$29 |
| Hardie Bay/Wine | $14-$24 |
| Premium custom (any tier) | +15-30% on base tier |
Key takeaways
- Floor area vs. wall area distinction matters
- Hardie $12-$22 valley; higher per tier
- Per-foot alone is misleading without scope
- Compare itemized scope, not per-foot price
FAQ
Quick Answers
Depends on tier and scope — $12-$22 valley standard is the band; verify what's included.
Bids below $12 typically miss scope; verify what's not included.
Sources
Authoritative references
- James Hardie — official product & installation resources
- Contractors State License Board (CSLB) — verify a California contractor
- Remodeling — Cost vs. Value Report (exterior remodel ROI, national & Pacific region)
External links to government, code, and manufacturer sources. Sierra Siding is not affiliated with these organizations; references are provided for verification.