The Real Cost of Step Code Compliance
Key takeaway: Step 4 adds $17,000 to $33,500 on a 2,000 sq ft home. After FortisBC rebates ($9,000 to $15,000), the net premium is $5,000 to $20,000. Experienced builders consistently hit the low end.
Incremental Cost by Step Level
Typical added costs for a 2,000 sq ft Part 9 home in the Okanagan (CZ5):
| Cost Category | Step 3 | Step 4 | Step 5 |
|---|---|---|---|
| Insulation upgrade | $1,500 - $3,000 | $4,000 - $8,000 | $8,000 - $14,000 |
| Windows/doors | $0 - $1,000 | $2,000 - $5,000 | $5,000 - $10,000 |
| Air sealing | $500 - $1,500 | $2,500 - $5,500 | $4,000 - $7,000 |
| HRV system | $2,000 - $3,000 | $3,000 - $5,000 | $4,000 - $6,500 |
| Heat pump | $0 - $2,000 | $3,000 - $6,000 | $5,000 - $8,000 |
| Energy modelling + testing | $2,000 - $3,000 | $2,500 - $4,000 | $3,000 - $5,000 |
| Total incremental | $6,000 - $13,500 | $17,000 - $33,500 | $29,000 - $50,500 |
Simple bungalow = low end. Complex two-storey with bump-outs = high end.
What Drives the Cost
Step 3: Modest upgrades. HRV system and energy modelling are the biggest additions. Manual air sealing at plates and penetrations.
Step 4: Three cost drivers. Hitting 1.5 ACH50 often requires aerosol sealing ($2,500 to $5,500). Continuous exterior insulation for R-22 to R-28 effective walls. Heat pump required via the FortisBC hybrid pathway.
Step 5: Passive House-adjacent. R-30 to R-40 walls, triple-pane windows, 80%+ HRV efficiency. Aerosol sealing is standard.
Rebate Offset
| Step Level | FortisBC (Hybrid) | CleanBC | Combined Potential |
|---|---|---|---|
| Step 3 | $3,000 - $5,000 | $2,000 - $4,000 | Up to $9,000 |
| Step 4 | $9,000 - $15,000 | $3,000 - $6,000 | Up to $21,000 |
| Step 5 | $11,000 - $20,000 | $4,000 - $8,000 | Up to $28,000 |
Duplexes and triplexes multiply per unit. A triplex at Step 5 could see $60,000+ in combined rebates.
ROI: Does It Pay?
| Metric | Step 3 | Step 4 | Step 5 |
|---|---|---|---|
| Incremental cost | ~$10,000 | ~$25,000 | ~$40,000 |
| FortisBC rebate | ~$4,000 | ~$12,000 | ~$15,500 |
| Net cost | ~$6,000 | ~$13,000 | ~$24,500 |
| Annual energy savings | $400 - $700 | $800 - $1,200 | $1,100 - $1,600 |
| Simple payback | 9 - 15 years | 11 - 16 years | 15 - 22 years |
Once Step 4 is mandatory, the “incremental cost” becomes the baseline and the rebate becomes pure savings.
Where to Spend and Where to Save
Spend on the energy advisor early. Design-stage involvement saves thousands vs. engaging after framing.
Spend on air sealing. Airtightness is hardest to fix post-drywall. A mid-construction test for $300 to $500 is the best insurance.
Save on windows (to a point). At Step 4 in CZ5, U-1.4 double-pane low-E works. No need for triple-pane unless your model requires it.
Save on equipment sizing. A tight Step 4 home needs less heating capacity than builders expect. Do not oversize the heat pump.
For a phase-by-phase approach, see our Step Code 4 checklist. Use our rebate calculator to estimate your specific numbers.