What Is a Passive House and Why It Matters

Passive House Defined

A passive house is a high-energy-efficiency building standard that uses advanced materials,
technologies, and smart design to achieve near-zero energy consumption for heating. Its
main benefit is a comfortable indoor environment with minimal heating and cooling costs.
Annual heating demand is limited to 15 kWh/m².

Compared to traditional homes, energy savings can reach up to 90%—resulting in lower
bills, reduced environmental impact, and improved quality of life.

Technical and Architectural Aspects of a Passive House

1. Key Technical Standards

● Annual heating demand: ≤ 15 kWh/m²
● Primary energy consumption: ≤ 120 kWh/m²
● Heat recovery efficiency: > 75%
● Thermal transmittance (U-value): < 0.15 W/(m²K)
● Airtightness (n50): < 0.6 h⁻¹

These values ensure optimal energy efficiency and high living comfort.

2. Design and Orientation

Passive houses must be architecturally designed to leverage natural conditions:

● Compact shape to reduce heat loss
● South-facing living areas
● Large glazed surfaces on the south side
● Summer overheating protection (shading, vegetation)

Proper design maximizes solar gains and minimizes thermal losses.

3. Materials and Construction

Only high-performance materials are used:

● Thermal insulation: 30–40 cm in walls and roof
● Windows: triple glazing, Uw < 0.8 W/m²K
● Doors: same insulation as walls
● Thermal bridge-free detailing

These materials maintain stable indoor temperatures without conventional heating.

4. Ventilation and Heating

Passive houses use central ventilation with heat recovery, ensuring:

● Fresh, dry air
● Fewer allergens and dust
● Lower heat loss

Heating is provided via warm-air systems or low-energy heat pumps.

Economics and Maintenance

1. Costs and Payback Period

Passive houses cost 10–15% more to build than standard homes. However, operating costs
are significantly lower. The typical payback period is 8–10 years. Government subsidies
(e.g. EKO Fund) can further reduce initial investment.

2. Maintenance and Lifespan

Passive houses require less maintenance:

● Automated systems
● Durable, high-quality materials
● Airtightness reduces wear

When properly designed and built, a passive house can last for decades.

Comfort and Health

3. Indoor Air Quality

Continuous ventilation ensures fresh air, improving health and well-being. Filtered air
reduces dust, allergens, and mold—ideal for people with asthma or allergies.

4. Year-Round Temperature Stability

Passive houses maintain steady temperatures year-round. Cool in summer, warm in
winter—without active heating. This enhances comfort and reduces energy demand.

Common Mistakes and How to Avoid Them

1. Frequent Mistakes

● Poor building orientation
● Inadequate insulation
● Incorrect ventilation system

● Wrong choice of windows and doors

2. How to Prevent Them

● Work with a qualified architect
● Use certified components
● Carefully plan every detail
● Conduct regular site supervision

The Architect’s Role and Our Services

1. Why the Right Architect Matters

A passive house isn’t just a technical solution—it’s a holistic approach to sustainable
construction. Your architect needs to know the standards, have hands-on experience, and
coordinate with installers and builders.
With the right design team, you’ll get better results and avoid unnecessary costs.

2. How OD-DO Helps

At OD-DO Architecture, we offer:

● Full design of passive houses, following all standards
● BIM models for accurate simulations
● Interior design with custom 3D visualizations
● Architectural supervision throughout the build

We’re your reliable partner for creating an energy-efficient and architecturally refined passive
home.

For more information about passive houses, contact us using the form below.