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Designing a passive house to meet Phius standards starts with choosing the right certification path for the project, its location, and its energy goal. From there, the work is to coordinate a climate-appropriate enclosure, windows and shading, airtightness, ventilation, mechanical systems, and project documentation—then verify the result using the applicable Phius requirements. Phius’ current guidebook is version 26.1.2, released October 14, 2026; its release notes describe clarifications and reorganized guidance, not major changes to certification requirements.
This guide focuses on new construction. Phius offers more than one route, and there is no single wall assembly, insulation value, or equipment package that guarantees certification everywhere. The applicable requirements depend on the project type, location, chosen path, and current certification documents.
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What do you need to decide before designing?
Before setting envelope specifications, identify the project type, location, and certification target. Those decisions determine which Phius path is available and which tools and requirements the design team should use.
- Project type: CORE is available for all new construction. CORE Prescriptive has a narrower scope that includes eligible single-family, duplex, and townhouse projects.
- Location: Climate affects prescriptive requirements and the project inputs used to establish performance targets.
- Energy goal: CORE is a performance path; CORE Prescriptive uses a checklist. Phius ZERO builds on CORE and targets net-zero source energy.
These paths are intended to reach the same level of building performance while regulating conservation measures differently. That does not make them interchangeable for every project: eligibility, modeling or checklist work, tradeoff options, energy goals, and documentation all matter. Review the current CORE, CORE Prescriptive, and CORE program information with the project team before choosing.
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Which Phius certification path fits the project?
Choose CORE when the project needs the performance path and project-specific targets; consider CORE Prescriptive only if the building is eligible and the team prefers its climate-specific checklist approach. Choose the target honestly: CORE does not, by itself, mean the building will produce as much energy as it uses.
| Path | Scope and approach | Energy goal and key distinction |
|---|---|---|
| Phius CORE | Available for all new construction; performance path with project-specific targets. | Regulates space-conditioning and source-energy performance. Certain fossil-fueled equipment is permitted subject to electrification-readiness requirements. |
| Phius CORE Prescriptive | Narrower eligible scope, including qualifying single-family, duplex, and townhouse projects; checklist-based with climate-specific requirements. | Phius says it is designed to achieve the same level of performance as CORE. Fossil-fuel equipment is not allowed. |
| Phius ZERO | Builds on CORE. | Targets net-zero source energy, with on-site and off-site renewable options and tighter restrictions on on-site fossil-fuel combustion. |
For CORE, compare the modeling workflow and design flexibility with the team’s capacity to develop and document project-specific performance. For the Prescriptive path, confirm eligibility first, then check whether the climate-specific requirements and available tradeoffs suit the design. If net-zero source energy is the goal, evaluate ZERO’s renewable options and fossil-fuel restrictions separately rather than assuming they follow automatically from CORE.
How do you set the project’s energy targets?
Use Phius’ project-specific calculator for CORE, or the current location-based resources and checklist for CORE Prescriptive. Do not substitute a generic “passive house” number for a target calculated or specified under the project’s applicable path.
For CORE, use the Phius 2024 Criteria Calculator with the project’s information. Phius explains that the source-energy limit varies with building size and occupant density. Conditioning targets regulate both peak and annual loads: peak-load reduction can affect comfort, resilience, and equipment sizing, while annual-load reduction affects operating energy. These are related but distinct design outcomes, so evaluate both rather than focusing only on annual consumption.
For CORE Prescriptive, use the current city-based Snapshot, climate map, zone table, and checklist. Phius describes the Snapshot as combining local climate data with building inputs; its zone table helps compare requirements among locations within a climate zone. The checklist includes tools for effective R-value, whole-building UA tradeoffs, moisture design, fenestration condensation, and equipment-energy tradeoffs. Start with the current CORE Prescriptive specifications and corresponding project materials rather than copying a requirement from another climate or an older checklist.
How should the envelope be designed?
Design the enclosure as a continuous system: insulation, air control, junctions, windows, and moisture behavior must work together. Phius identifies continuous insulation without thermal bridging and an extremely airtight envelope among its core passive-building principles.
Choose an insulation strategy that remains continuous at transitions and junctions, and detail those junctions to limit thermal bridges. A nominal insulation value alone does not describe the whole assembly: interruptions, connections, and the resulting interior surface conditions can matter. Use the applicable climate-specific moisture-design path, and check interior surface temperatures at windows and thermal bridges for condensation and mold risk.
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For a prescriptive project, the checklist’s effective R-value and whole-building UA tools can help evaluate the assembly and tradeoffs. The applicable Phius requirements do not specify one universal assembly. Keep drawings, modeled assumptions, and construction details aligned so that the design being reviewed is the design the project intends to build.
How do windows, doors, orientation, and shading affect compliance?
Select windows and doors for whole-unit thermal performance and coordinate them with orientation, solar gain, and shading. A product’s nominal rating is only part of the decision; window size and location, local climate, and the installed junction affect comfort and energy performance.
Phius’ prescriptive material says its window comfort limit varies with window height and the ASHRAE 99% design temperature for the project location. Use the applicable location-specific tool rather than applying one threshold to every opening. Consider solar heat gain for heating-season benefit while managing cooling-season comfort through orientation, glazing properties, and shading. Include doors and skylights in the same envelope-level review where applicable.
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How do you design and verify airtightness?
Draw a continuous air-barrier strategy, show how it transitions between materials and assemblies, coordinate it with trades, and plan for testing. For CORE Prescriptive, the published airtightness requirement is 0.040 CFM50 per square foot of enclosure, with full-building pressurization and depressurization tests required before drywall and at final construction.
Confirm the currently applicable test method, any exceptions, and project-specific instructions in the current checklist and guidebook before writing the specification. The published number is not a substitute for confirming which procedure applies to a particular project.
Use details that can be built and checked. A tape may be an appropriate consumable within a compatible assembly, but no tape alone establishes compliance. Specify substrate compatibility and product data for the intended assembly, and make transitions visible in construction documents so the team can coordinate their installation and verification.
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Testing before drywall provides an opportunity to identify air-barrier deficiencies while assemblies are still accessible; the final test checks the completed building. Treat these as planned quality-control milestones, not paperwork to arrange after the enclosure is finished.
How should ventilation and mechanical systems be sized?
Plan balanced ventilation with heat and moisture recovery, then size space-conditioning equipment to the modeled or prescribed loads—not to conventional assumptions. Phius names balanced ventilation with heat and moisture recovery, along with minimal space-conditioning demand, among its basic passive-building principles.
Coordinate airflow, distribution, efficiency, and climate-specific requirements with the enclosure and the selected path. A well-insulated, airtight design reduces the load the heating and cooling systems must serve, but ventilation remains a deliberate system that needs balanced, designed airflow. Review equipment energy tradeoffs where the Prescriptive checklist provides them, and ensure the model’s assumptions reflect the equipment being specified.
Keep other energy uses in view as well. CORE’s overall energy requirements make lighting, appliances, water heating, and other equipment relevant; the prescriptive checklist includes component-efficiency and tradeoff approaches for some end uses. Decisions about these loads should be coordinated with the applicable targets rather than postponed until after the envelope is fixed.
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How do you keep an airtight building safe from moisture and mold?
Airtightness does not remove the need for moisture design. Address moisture through climate-appropriate assemblies, controlled ventilation, and checks of vulnerable surfaces and junctions.
Use the applicable moisture-design tools and review the conditions at window perimeters and thermal bridges, where interior surface temperatures can be a concern. For prescriptive work, the checklist includes moisture-design and fenestration-condensation tools. Coordinate assembly layers and details with the actual climate and the project’s modeled assumptions; an airtightness target is not, by itself, proof that an assembly is moisture-safe.
Phius’ passive-building FAQ addresses the question of moisture and mold in airtight buildings. Use it alongside the current project requirements, not as a substitute for project-specific analysis.
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How should the project team prepare for Phius review?
Bring the modeler, design team, and rater or verifier into the process early, and use the current guidebook to plan submissions and milestones. Phius describes the guidebook as the central reference for its project certification program.
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The current guidebook is the 2024 guidebook, version 26.1.2, released October 14, 2026. The release notes say the update clarifies existing requirements and adds or reorganizes guidance without major certification-requirement changes. They call out clearer WUFI Passive modeling protocols, a new METr modeling guidance section, clarified project milestones, and the updated co-requisite name DOE Efficient New Homes (ENH). Read the v26.1.2 release notes and obtain the complete current guidebook for exact forms, modeling protocols, documentation, and submission sequence.
A prior guidebook release is not a safe basis for resolving detailed current requirements. The v25.1.0 redline is an older edition; the current release notes report no major requirement changes, but the complete current guidebook remains the authority for clause-level requirements and project submissions. Confirm that the whole team is working from the same version, especially when defining modeling assumptions, review milestones, and verification responsibilities.
How should you evaluate products for a Phius project?
Compare documented performance, climate suitability, installation details, moisture behavior, and the data available for modeling. Phius product certification can provide vetted data, but certification is not mandatory for every product used in a project; each product still needs to meet the project’s applicable criteria.
Relevant product categories include high-performance windows, doors, skylights, ventilator units, and prefabricated panels. Use the Phius products directory and its product certification overview as references, then verify that the selected product’s documented properties, configuration, and installation assumptions match the design and energy model. Product certification should not be confused with automatic project compliance.
For air-sealing materials, evaluate compatibility with the actual substrate and assembly, as well as the product data needed by the project team. Treat tape as one possible construction consumable, not as a standalone airtightness strategy or a guarantee of a test result.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What are the most common design and coordination mistakes?
The avoidable problems usually come from treating interdependent decisions as isolated product selections or leaving verification until construction is nearly complete.
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- Choosing a path after the design is advanced: establish eligibility and certification goal before setting targets and documentation responsibilities.
- Using generic targets or assemblies: use project-specific CORE targets or current location-specific Prescriptive tools; do not carry assumptions across climates without checking them.
- Designing insulation without junctions: show continuity and review thermal bridges, interior surface temperatures, and moisture risk.
- Selecting windows on one rating alone: coordinate whole-window performance, height, orientation, solar heat gain, shading, and opening details.
- Treating airtightness as a product purchase: specify a continuous air-barrier approach, compatible materials, buildable transitions, and required testing.
- Oversizing from conventional assumptions: size space-conditioning equipment to the modeled or prescribed loads.
- Relying on an old guidebook: confirm exact current clauses, forms, and milestones in v26.1.2 and the applicable current checklist.
How do you turn the design into a practical sequence?
A clear sequence helps keep certification decisions, modeling, details, and field verification aligned.
- Confirm scope and goal. Record building type, location, desired certification, and whether net-zero source energy is an objective.
- Select the eligible path. Compare CORE’s performance modeling with Prescriptive eligibility and checklist requirements; consider ZERO where its source-energy target fits.
- Set targets early. Use the 2024 Criteria Calculator for CORE, or the current Snapshot, climate resources, and checklist for Prescriptive.
- Develop the enclosure. Coordinate continuous insulation, thermal-bridge details, air barrier transitions, moisture design, and opening details.
- Coordinate solar and systems. Align fenestration and shading with local climate; plan balanced heat- and moisture-recovery ventilation and equipment sized to the loads.
- Account for remaining energy uses. Review lighting, appliances, water heating, and other applicable equipment assumptions.
- Plan documentation and verification. Assign modeling and review roles, confirm current guidebook submissions, and schedule applicable airtightness testing milestones.
- Reconcile design and construction. Check that specified products, installed details, model assumptions, and verification records refer to the same project configuration.
Phius’ basic design principles are connected rather than independent checklist items: continuous insulation, airtightness, high-performance openings and managed solar gain, balanced heat- and moisture-recovery ventilation, and low space-conditioning demand all depend on coordinated decisions. The practical route to certification is therefore to choose the correct path first, use its current tools, and carry the same assumptions through drawings, modeling, construction, and verification.
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Frequently Asked Questions
How much more does a Phius passive house cost to build?
Phius’ FAQ lists estimates of about 3–5% above a conventional home and 0–3% for multifamily compared with an Energy Star baseline, but the figures have no publication year. Treat them as undated estimates, not a current project budget; actual costs depend on the project and its scope.
Does every window or ventilation product need Phius certification?
No. Phius product certification can provide vetted data, but it is not mandatory for every product in a project. The selected product still needs documented properties that satisfy the applicable project criteria and align with the design assumptions.
Can I use a Phius passive-house wall assembly in any climate?
There is no universal assembly specification in the available Phius guidance. Use the current location-specific requirements and moisture-design tools, and verify thermal-bridge and condensation risks for the actual project.
What should I confirm before submitting a Phius project for certification?
Confirm the applicable guidebook version, path-specific forms and modeling protocol, project milestones, and required test method with the complete current guidebook and checklist. The v26.1.2 release notes summarize changes but do not replace the guidebook’s detailed submission instructions.
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