Oliver Step Code & AeroBarrier Air Sealing

Current Step: 3 | ACH Target: 2.5 ACH50 | Climate Zone: 5 | Permit Office: oliver.ca

Wine Capital of Canada, Tightest Building Envelope Standards

The Town of Oliver, self-styled as the Wine Capital of Canada, sits at the heart of the southern Okanagan wine region just north of Osoyoos and south of Penticton. With more than 40 wineries within a short drive, residential construction in Oliver caters heavily to vineyard estates, agritourism accommodations, and lifestyle homes for retirees and remote workers.

Every new Part 9 residential building in Oliver must comply with BC Energy Step Code 3, which includes a mandatory airtightness target of 2.5 ACH50. This is verified through a blower door test before the Town will issue an occupancy permit. There is no climate exemption for warm communities. The 2.5 ACH50 target applies in Oliver exactly as it does in colder northern BC towns.

Oliver’s Hot, Dry Climate Zone 5

Oliver enjoys some of the warmest summers and mildest winters in all of Canada. Daytime temperatures regularly exceed 35 degrees Celsius from June through September, and winter lows rarely drop below minus 10. Despite this, Oliver remains in Climate Zone 5 for BC Energy Step Code purposes, which determines the energy modelling baseline.

The hot summer climate creates a different focus for Oliver builders compared to communities further north:

• Cooling load matters more than heating load for many Oliver homes
• South and west window orientation can drive significant cooling demand without proper shading
• High-performance windows with low SHGC are often more important than ultra-high R-values
• Air conditioning sizing is a real consideration, unlike in many Canadian markets

But airtightness is still measured the same way. A leaky house in Oliver wastes summer cooling just as effectively as it wastes winter heating. The 2.5 ACH50 blower door test does not care whether your air conditioner or your furnace is doing the work.

Common Construction Types in Oliver

Oliver’s residential builders work on a distinctive mix of project types:

• Vineyard estate homes on large rural lots, often with attached suites or guest houses
• Agritourism builds including small cottages, tasting room buildings with attached living, and B&B-style residences
• Town centre infill in established Oliver neighbourhoods near the river and main street
• Bench-top custom homes on the slopes east and west of the valley with views over the vineyards
• Manufactured home replacements and modular builds in older communities

Each of these project types must hit the same 2.5 ACH50 target, regardless of size or complexity.

How AeroBarrier Helps Oliver Builders

AeroBarrier is an automated air sealing system that achieves precise, measurable airtightness in a single afternoon. Here is the basic process:

1. Your home is mostly framed and rough-in is complete (electrical, plumbing, HVAC)
2. The home is depressurized using a blower door system
3. A water-based, non-toxic sealant is misted into the air
4. Air movement carries the sealant directly into every gap, where it accumulates and seals
5. You watch the ACH number drop on screen in real time

For a typical Oliver vineyard home of 2,000-3,000 sq ft, the entire process takes 2-4 hours. The result is a verified airtightness level that is nearly always well below the 2.5 ACH50 minimum, often reaching 1.0-1.5 ACH50 — which qualifies for Step 4 and unlocks substantial FortisBC rebates.

FortisBC Rebates Available in Oliver

Oliver is served by FortisBC for natural gas, and FortisBC’s rebate programs apply to qualifying high-performance new builds:

• Step 4 compliance at 1.5 ACH50: up to $15,000 per dwelling unit
• Step 5 compliance at 1.0 ACH50: up to $20,000 per dwelling unit
• Heat pump rebates stack on top of Step Code rebates for additional savings

For Oliver builders constructing duplexes, triplexes, or guest houses on vineyard properties, rebates apply per dwelling unit. A vineyard estate with a main home and a separate guest cottage built to Step 4 could collect $30,000 in combined rebates.

Run the numbers using our Step Code calculator.

Permit Process in Oliver

Oliver follows the standard BC Energy Step Code compliance process:

1. Pre-construction: Your energy advisor builds a HOT2000 model using Oliver’s local weather data and produces a design-stage compliance report. This document is required as part of your building permit application
2. Mid-construction (recommended): A pre-drywall blower door test catches air sealing problems while you can still fix them. This is an inexpensive insurance policy
3. As-built (required): A final blower door test confirming 2.5 ACH50 or better, plus an updated as-built compliance report. These documents are required before the Town issues an occupancy permit

Air Sealing Strategy for Oliver Builds

Hot summers and mild winters do not change the air sealing playbook. The same building science applies. Focus on these areas during construction:

1. Continuous air barrier from foundation to roof — this is the single most important concept
2. Slab-to-wall transitions — particularly important on slab-on-grade designs common in southern Okanagan
3. Window and door rough openings — with proper backer rod and sealant, plus continuous flashing
4. Penetrations — every plumbing vent, electrical service, HRV duct, and range hood goes through your air barrier and creates a leak unless sealed
5. Top-of-wall connections — where wall framing meets ceiling joists or trusses

If your crew is not experienced with airtight construction, the math gets challenging. AeroBarrier provides a safety net by sealing what your team misses.

Frequently Asked Questions

Does Oliver enforce Step 3?

Yes. The Town of Oliver requires Step 3 for all new Part 9 residential buildings. You must submit a design-stage compliance report with your permit application and a final as-built compliance report including a blower door test result of 2.5 ACH50 or better before occupancy.

Is air sealing really necessary in such a warm climate?

Yes. Air sealing is about controlling air movement through the building envelope, which affects both heating and cooling performance. In Oliver, leaky homes lose expensive air-conditioned air in summer just as quickly as they lose heated air in winter. The 2.5 ACH50 target is the same throughout BC.

How does AeroBarrier work in Oliver’s hot climate?

AeroBarrier is applied indoors during the construction process and is unaffected by outdoor temperature. We typically schedule seal days in early morning during summer months to keep crews comfortable. The sealant cures within hours and is non-toxic, making it safe for the home and occupants.

What rebates can Oliver builders access?

Oliver is in FortisBC’s service area, so FortisBC new home rebates apply. Step 4 compliance unlocks up to $15,000 per dwelling unit. Step 5 unlocks up to $20,000. Heat pump rebates stack on top. Use our calculator to estimate your specific project.

How far in advance should I book AeroBarrier?

For Oliver projects, we typically recommend booking 2-3 weeks before your target seal date. The seal day should happen after rough-in inspections are complete but before drywall installation begins. Call 250-864-8727 to discuss scheduling.

Can I serve as both builder and energy advisor?

No. The energy advisor must be a third-party Certified Energy Advisor registered with Natural Resources Canada. They are responsible for the HOT2000 model, the design-stage compliance report, and the final as-built compliance report. We work alongside your energy advisor on the air sealing portion.

Build Your Next Oliver Project With Confidence

Wine country residential construction is a highlight of Oliver’s economy, and Step Code compliance is now a standard part of every new home. Okanagan AeroBarrier Inc. helps southern Okanagan builders hit their targets the first time, every time.

Call us at 250-864-8727 or get a free consultation.