Blaise Building Services — certified passive house builder Sydney

Passive House Overview

Sydney's Certified Bespoke Passive House Builder

Blaise Building Services is a certified Passive House builder in Sydney, constructing healthy, carbon-negative custom homes across the Eastern Suburbs. Founded by Passivhaus-trained director Stephane Blaise, our team uses German-standard building physics and Blower Door testing to deliver custom homes that reduce heating and cooling energy use by up to 90%.

Ready to start? Book your On-Site Feasibility Study with Stephane. One hour on-site. No obligation. Full audit of your property, your goals, and your build viability.

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90%energy saved

Verified reduction in heating and cooling energy demand

≤0.6ACH50

Mandatory airtightness standard — physically tested at handover

3×tested

Blower Door Tests at framing, rough-in, and lock-up

PassivhausInstitut

Certified by Germany — the gold standard in building physics

Certified Standards

Certified, Verified, and Built Correctly

Every builder in Sydney will tell you they build energy-efficient homes, but very few can produce a physical Blower Door Test result to prove it. At Blaise Building Services, we believe that thermal quality should be a verified outcome, not an unproven marketing claim.

We operate as a premier certified Passive House builder in Sydney, delivering custom homes that comply strictly with the international Passivhaus standard. We bring the rigorous technical training and meticulous carpentry required to execute these complex, airtight envelopes correctly.

Passivhaus Institut Certified

Physical Blower Door Testing

PHPP Modelled Every Build

Read Our Carpentry Standards Story

Certified Passive House construction — Blaise Building Services Sydney

Building Science

The Five Core Passivhaus Principles

To deliver a certified Passive House, we execute five integrated building science principles on every build. These are not optional upgrades — they are the structural foundation of your home.

Continuous Thermal Insulation

We wrap your entire home in a continuous layer of high-performance insulation with no structural gaps — keeping external summer heat out and retaining internal warmth during coastal winters.

90%reduction in heating & cooling energy

Airtight Construction

We seal the building envelope with high-performance vapour membranes, controlling air movement through the structure to eliminate draughts and condensation at every junction.

≤0.6ACH50 — mandatory Passive House standard

Mechanical Heat-Recovery Ventilation (HRV)

A balanced MVHR system continuously extracts stale, humid air from bathrooms and kitchens, replacing it with fresh, filtered outdoor air while recovering up to 90% of the outgoing thermal energy.

90%thermal energy recovered via HRV

High-Performance Glazing

We specify double- or triple-glazed windows with thermally broken timber or uPVC frames, managing solar heat gain and eliminating the condensation that is common on standard aluminium frames.

3×glazing tested at framing, rough-in, lock-up

Thermal Bridge-Free Detailing

We design every structural junction to prevent cold bridging — ensuring there are no conductive heat paths that cause internal cold spots, mould, or structural dampness.

0thermal bridges on a compliant envelope

Review Our Step-by-Step Build Process

Passive House cost modelling and PHPP — Blaise Building Services

Cost Transparency

Early Cost Transparency and Our Cost-Modelling Process

Certified Passive House construction requires precision. To ensure your project remains financially viable, we participate early in the process through our Early Construction Involvement (ECI) process.

Before your architect finalises drawings, we model your home's thermal performance using PHPP software and produce a detailed Quick Building Estimate — aligning material specifications with your actual budget before final documentation is locked in.

PHPP thermal performance modelling

SketchUp 3D material takeoffs

Quick Building Estimate (QBE)

Fixed-price contract before site start

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Building Insights

High-Performance Building Insights

Stephane has answered three of the most critical questions we receive regarding certified Passive House construction in Sydney.

What makes a Passive House different from a standard home?

A standard home meets minimum building code requirements, which often results in uncontrolled air leaks, mould, and high energy bills. A Passive House is built to strict certified standards, requiring a continuous thermal envelope and mechanical ventilation to deliver verified thermal comfort and healthy indoor air.

Does a Passive House suit Sydney's humid coastal climate?

Yes, exceptionally well. Sydney's coastal humidity, high winds, and solar exposure are precisely the environmental loads that a Passive House building envelope is engineered to manage — keeping indoor humidity at a stable, healthy 40% to 60% range year-round.

Can you build a certified Passive House on a sloped Eastern Suburbs block?

Yes. Passive House is a performance standard, not an aesthetic or structural shape. Stephane has over 20 years of experience delivering premium bespoke builds on complex, sloped sites across Sydney's Eastern Suburbs.

Certified Builds

Selected Passive House Projects

Every project below is a physically tested, certified Passive House built in Sydney's Eastern Suburbs.

Certified Passive House

Coogee Passive House

A cliffside custom build featuring continuous insulation and high-performance timber glazing, verified at ≤0.6 ACH50 by Blower Door Test.

First in Australia

Seaforth Passive House

Australia's first structural rooftop garden on a certified bespoke Passive House. Slab-to-cladding airtight envelope verified at 0.9 air changes per hour.

Coastal Passive House

Phillip Bay Passive House

Bespoke coastal Passive House engineered for high wind loads and direct UV exposure — zero structural dampness or moisture infiltration.

Browse Our Completed Passive House Projects

Common Questions

Honest Answers to Our Passive House Construction FAQs

Constructing a certified bespoke home in Sydney requires complete clarity on testing, ventilation, and standards.

Access Our Complete FAQs

What is a Blower Door Test and is it mandatory for certification?

Yes, a physical Blower Door Test is mandatory for formal certification. At completion, we depressurise and pressurise the home using a calibrated fan to measure air leakage. For Passive House certification, results must be below 0.6 air changes per hour — demonstrating your home's airtightness.

Do we have to certify our Passive House?

No, you can build to Passive House principles without pursuing formal certification. However, we always recommend certification as it provides independent verification of build quality and may significantly enhance your property's resale value.

Is an energy-efficient home builder in Sydney different from a Passive House builder?

Yes. An energy-efficient builder typically relies on design-stage software estimates. As a specialist Passive House builder, we deliver a physically tested, airtight building envelope backed by verified performance metrics and international certification.

Verify Your Site's Potential

Verify Your Site's Passive House Potential

Do not risk commissioning an architectural design on a site without first verifying its solar orientation, setback constraints, and local council overlays. Book a consultation with Stephane Blaise today to assess your property's Passivhaus potential.

Schedule Your Passivhaus Feasibility Session

About the Author

Written and reviewed by Stephane Blaise. Director, Blaise Building Services. Certified Passive House Tradesperson and Certified Passivhaus Designer (Passivhaus Institut, Germany). Licensed Builder, NSW Fair Trading. Member, Master Builders Association NSW and Australian Passive House Association.

Certified Passivhaus Designer — Passivhaus Institut, Germany

Licensed Builder — NSW Fair Trading

Master Builders Association NSW & Australian Passive House Association

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PASSIVE HOUSE BUILDER SYDNEY