Blaise Building Services — passive house design consulting Sydney

Consulting Overview

Certified Passive House Design Consulting in Sydney

Blaise Building Services provides certified Passive House design consulting in Sydney for architects, developers, and owner-builders. Led by director Stephane Blaise, our high-performance home design consulting reviews structural drawings for buildability and budget security before drawings are finalised, ensuring your project meets international airtightness standards.

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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20+years

Hands-on Sydney construction experience informing every design review

4phases

Site analysis · Detailing · MVHR · Cost modelling — covered end to end

100%on paper

Every buildability issue resolved before council DA submission

PHPPmodelled

Thermal performance modelled with German Passivhaus Institute software

Design to Reality

Bridge the Gap from Design to Reality

The most expensive time to discover a structural design conflict is after you have signed a construction contract. For Passive House and high-performance custom projects, minor drafting mistakes in a structural junction or a poorly planned ventilation duct can cause a Blower Door Test failure at completion.

We provide specialist Passive House advice in Sydney to bridge the gap between design-stage drawings and real-world construction. By engaging a certified Passive House consultant early during the schematic phase, you receive the technical residential design support required to de-risk your project before documentation is submitted for council approvals.

The most common Passive House failure point is a broken airtight membrane path at a structural junction — a detail that costs $300 to fix on paper and $30,000 to remediate after lock-up.

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Passive House design review — Blaise Building Services Sydney

Our Consulting Scope

What Our Consulting Service Covers

Our design consulting is construction-focused, providing practical detailing support across four core phases — from your first site visit to your final pre-DA drawings.

Feasibility01

Site and Orientation Analysis

We analyse your site's topography, council planning overlays, and solar access to provide early feasibility guidance on window placement and shading — before a single detail is drafted.

Design Review02

Detailing & Junction Audits

We conduct a rigorous design review of your architectural drawings to identify and eliminate potential thermal bridges and to detail the continuous airtight membrane path at every junction.

MVHR Systems03

Mechanical Systems Integration

We consult on mechanical MVHR ventilation layouts, sizing, duct pathways, and unit selection to ensure whisper-quiet operation and stable indoor air quality throughout the home.

Cost Modelling04

Cost-to-Build Modelling

We model your project's real construction costs during design development using PHPP software and detailed takeoffs to align your drawings with your actual budget boundaries before DA submission.

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Builder vs Modeller

Why Consult a Builder, Not Just a Software Modeller?

Software models produce theoretical calculations, but sites produce physical buildings. Many high-performance projects fail to meet their certification targets because specified architectural details are too complex or practically unachievable for tradesmen to execute on site.

Stephane Blaise brings over 20 years of hands-on local building experience to your design team — reviewing drawings for real-world buildability, ensuring your airtight barrier is continuous, and your thermal junctions are practical.

“A PHPP model tells you what your home should achieve. A Blower Door Test tells you what it actually does. We work backwards from the test to guarantee both numbers match.”
— Stephane Blaise, Director

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Software Modeller OnlyBlaise Design Consulting

Performance targets modelled

Physical buildability reviewed

Thermal bridge junctions detailed

MVHR system sized and routed

Construction cost aligned

Blower Door Test outcome guaranteed

Building Insights

High-Performance Building Insights

Stephane has answered three of the most critical questions we receive from architects and owner-builders navigating pre-construction.

At what stage of a project should architects contact Blaise?

You should contact us as early as possible, ideally during the schematic design phase. The earlier high-performance envelope principles are integrated into your plans, the less expensive they are to implement — saving your project from costly late-stage structural revisions.

Can Blaise provide a Quick Building Estimate before a design is completed?

Yes, we can produce a Quick Building Estimate (QBE) from early-stage conceptual sketches or basic 3D massing models. This early cost modelling provides your architect with a realistic budget framework to design within, protecting your client relationship.

How does Blaise handle communication between architect, client, and builder?

We maintain complete project transparency. All design reviews, specifications, and constructability audits are logged and tracked in real time through our WunderBuild portal, ensuring that all partners share a single source of truth throughout pre-construction.

Common Questions

Honest Answers to Our Design Consulting FAQs

Partnering with an experienced Passive House consultant in Sydney ensures your project's certification stays within budget.

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What is the difference between an energy assessor and a design consultant?

An energy assessor produces a minimum building code compliance report based on software estimates. A Passive House design consultant reviews physical construction details, membrane junctions, and mechanical system layouts to ensure that performance targets are achieved on-site.

Do you provide formal Passive House certification?

We advise on design specifications, energy modelling, and construction detailing to meet international standards. Formal certification is issued by an independent, accredited certifier, and we manage this entire documentation process on your behalf.

Can you consult on existing home renovations?

Yes, we provide specialised performance audits and design consulting for heritage retrofits using the international EnerPHit standard, outlining a staged, cost-effective path to improve comfort and eliminate dampness.

Validate Your Design

Validate Your Design with Certified Construction Science

Do not risk submitting architectural drawings to the council without first verifying their high-performance buildability and real-world cost to build. Book an On-Site Feasibility Study with Stephane Blaise today to review your early-stage plans, analyse your envelope specifications, and secure absolute certainty before you document further.

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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 DESIGN CONSULTING