Blaise Building

At Blaise Building Services, we believe in improving the living conditions of every human and looking after the planet by providing a healthier environment through high performance construction. Our aim is to make healthier, more economical and sustainable homes the new norm.

Passive House People
Sydney's Passive House Specialists

Sydney's Certified Bespoke Passive House Builder

Blaise Building Services is a specialist passive house builder in Sydney, working primarily across the Eastern Suburbs. Founded by Passivhaus-trained director Stephane Blaise, we design and construct high-performance homes and EnerPHit retrofits that reduce heating and cooling energy by up to 90% while permanently eliminating mould, draughts, and condensation.

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Passive House Certified Builders

Sydney's Certified Bespoke Passive House Builder

Reduce your heating and cooling energy by up to 90% with our EnerPHit retrofits and new passive house builds across Sydney's Eastern Suburbs.

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Eastern Suburbs & Greater Sydney

Sydney's Certified Bespoke Passive House Builder

Led by Passivhaus-trained director Stephane Blaise, our team builds high-performance homes designed to stand the test of time.

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Passive House People
About Us

Dedicated High Performance Home Builder in Sydney

We are a premium residential builder, and our reputation as a certified high performance home builder in Sydney is built on precision standards. Operating strictly within Sydney's Eastern Suburbs, our crew delivers bespoke homes and bespoke passive homes that are carbon-negative and energy-positive. Every project we construct is backed by a physical Blower Door Test at completion to verify airtight construction, energy efficiency, and thermal performance.

If you are looking to hire a custom home builder who bypasses competitive tendering in favour of architect collaboration to achieve sustainable construction, we are here to help. We work with detail-driven homeowners, architects, and developers who refuse to compromise on build quality, thermal comfort, and precision execution from a dedicated builder.

We are not a volume builder. We do not take every project. We take the right projects and build them correctly.

Our Building Outcomes

Four core high-performance building outcomes. Proven by building science, engineered for your comfort.

Healthy Indoor Air

Continuously filtered fresh air via mechanical MVHR ventilation and stable indoor humidity, meaning zero risk of toxic mould.

Thermal Comfort

Stable indoor temperatures of 20 to 25 degrees Celsius, year-round, with minimal active heating or cooling.

Acoustic Silence

An airtight building envelope that significantly calms loud coastal wind, traffic, and aircraft noise.

High Energy Efficiency

Up to 90% less energy used for space conditioning for the lifetime of the building fabric.

What We Build

We Offer Different Services For Helped You

Three core high-performance residential disciplines. Built with meticulous carpentry and verified with physical testing.

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Custom Home Building
Custom Home Building

Exact-fit custom homes designed around your site orientation, geotech conditions, and daily lifestyle. We align your architectural brief with realistic construction costs early in the process, delivering a structural envelope that performs.

Luxury Home Building
Luxury Home Building

Premium-grade materials, prestige finishes, and meticulous carpentry. We combine high-end craftsmanship with verified building science to construct homes that look stunning, feel comfortable, and maintain high thermal efficiency.

High-Performance Residential Builds
High-Performance Residential Builds

Building envelope-first design engineered specifically for Sydney's humid coastal climate. We construct homes designed for year-round thermal stability, low energy running costs, and healthy indoor air quality.

Our Process

Let's Get Started

You have two options before committing to a full construction contract. Both protect your time and your money.

01

On-Site Feasibility Study

Stephane visits your property to evaluate geotechnical constraints, council planning overlays, and solar access, and to determine whether your project goals align with your site's physical realities before you commit to architectural design.

Schedule Your Property Feasibility Study
02

Quick Building Estimate (QBE)

Once the site is confirmed as viable, we produce an early pre-construction estimate. We use 3D SketchUp modelling and automated BOQ takeoff via Vision 2 Estimating software. You get a realistic number before your architect finalises drawings.

Learn How We Model Your Budget
Our Guarantee

The Blaise Precision Guarantee

Choosing a passive house builder in Sydney for your custom project requires complete trust. The Blaise Precision Guarantee is our operational commitment to transparency, technical precision, and budget security on every sustainable construction project we accept.

Design-to-Budget Certainty

Our architect collaboration process means we review your architect's drawings before they are finalised to correct budget misalignments during the design stage, keeping your sustainable construction project fully secure.

Certified Performance

Every bespoke home we build must pass a physical Blower Door Test at completion to verify airtight construction against international standards, providing documented proof of your building's energy efficiency.

Zero Communication Gaps

We provide total project transparency through our client portal, active throughout construction. We give you daily access to site schedules, progress photos, and direct communication, removing all silent weeks so you can build with confidence.

Post-Build Care Reminders

Every six months, we schedule automated maintenance reminders covering your mechanical HRV filters, gutters, and general performance checks to ensure your high performance homes perform at a superior level.

These commitments are built into our construction workflow from day one. If you want a Sydney builder who takes absolute responsibility for your home's performance and your budget, the smartest first step is to book an on-site feasibility study.

Read Our Full Guarantee
Blaise Precision Guarantee Seal
Process Overview

Our High-Performance Delivery Process

A successful build requires a disciplined, step-by-step roadmap. We keep your project organised from your first site consultation through to final handover and certification, ensuring complete transparency at every stage of the build.

01

On-Site Feasibility Study

Stephane visits your property to evaluate geotechnical constraints, council planning overlays, and solar access, and to determine whether your project goals align with your site's physical realities before you commit to architectural design.

02

Quick Building Estimate

Once feasibility is confirmed, our team produces a 3D cost model and a detailed bill of quantities, giving your architect a clear, real-world budget to design within before drawings are finalised.

03

Early Construction Involvement

We collaborate with your architect during the design stage to review detailing, buildability, and passive house compliance. This architect collaboration prevents the costly redesigns and late-stage variations common in standard builds.

04

Certified Construction

We manage the construction of your high-performance envelope under strict quality controls. Our specialised team handles everything from airtight construction to structural framing, keeping you updated daily via your client portal.

05

Blower Door Testing

At completion, we conduct a physical Blower Door Test to measure and verify the airtightness of your building envelope, providing documented certification of your home's energy efficiency.

06

Post-Build Support

Every six months, we schedule maintenance check-ins to inspect your mechanical ventilation filters, gutters, and structural elements, protecting your investment and maintaining peak performance long-term.

These six steps are how we eliminate building anxiety and deliver on our performance promises. If you want a structured, transparent process from a dedicated high-performance home builder in Sydney, the first step is to book an on-site feasibility study.

Start Your High-Performance Process
Completed Project

Selected Custom Projects

Real physical proof. Mapped and tested in Sydney's coastal suburbs.

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Coogee Passive House
Coogee Passive House

A cliffside custom home project in Sydney. Features west-facing principal living engineered with continuous insulation and high-performance timber glazing to remain comfortable year-round.

Phillip Bay Passive House
Phillip Bay Passive House

Bespoke coastal construction designed to handle high wind loads and direct UV exposure without structural dampness or moisture problems.

Seaforth Passive House
Seaforth Passive House

Australia's first structural rooftop garden on a certified bespoke passive house. Features a slab-to-cladding airtight envelope verified at 0.9 air changes per hour.

Testimonials

Why They Believe In Us

We believe that construction quality should be proven through physical evidence, not just promised.

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Positive Reviews

Rating

5.0

We engaged Blaise Building to do a passivhaus report (guiding the selection of materials to suit our location and climate), framing, and passivehaus elements to our home. This ended in a blower door test to assure targets were met. Our desired goal was to create a home with passivhaus principles (not certified passivhaus) and we agreed on a target of under 2.0 ACH50. The final result his team achieved for us was just under 1.0.

Leah Poole
Owner

Rating

5.0

Let me start by saying that I am extremely meticulous with extremely high expectations for precision work. Blaise exceeded all my expectations and the team are extremely professional and very friendly. They specialise in exceptional carpentry but even more so in ensuring homes are built to keep out mould and moisture by ensuring it is well sealed with the best products. I have not been able to fault any of their work and would be more than happy to recommend them to anyone.

George A
Owner/Builder

Rating

5.0

We had a deck designed, renovated and additions installed. The quality of the work is X 5 star. The team work hard and the end result was impressive and we would not consider any other builder/carpenter in the future. We trust Blaise 100% and thank you for helping create such a wonderful space for our family.

Matt M
Home Owner

Rating

5.0

Steph and his team are highly adaptable, polite, clean and very patient. I changed my mind many times during our build. Steph and his team were very accommodating and dynamic enough to pivot with the changes even when those changes became more technical than the original job.

Teora W
Business Owner
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Major Partners

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Eureka Insulation
Master Builders
Passive House Association
Passive Purple
Blaise Building Services
Eureka Insulation
Master Builders
Passive House Association
Passive Purple
Blaise Building Services
Book a Consultation

Let's get your project moving.

A successful build starts with a realistic conversation. Book a Project Consultation to get clarity on your goals, the likely scope of work, and the right next step for your property.

In this consultation, we cover:

  • Your project goals and the specific upgrades you are looking for
  • Realistic budget ranges for architectural extensions and major renovations
  • Timeline expectations and our process for keeping things running smoothly
  • Whether your project is a good fit for our team

Book Your Consultation
Let's Get Started

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News & Blog

Check Latest
Blog Post

A successful build starts with straightforward, honest information. On our custom home builder blog, Stephane shares practical home-building advice, and our Passive House blog offers insights covering building physics, council planning approvals, and pre-construction cost modelling.

What is a Passive House?

First created in Germany, Passivhaus is considered one of the most rigorous voluntary, energy and health based standard in the world's design and construction industry today.

Why Build An Airtight House?

Many building owners are unaware that airtight construction improves the quality of life while costing less money to run. Furthermore, an airtight structure lasts longer.

Stephane Blaise

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