Blaise Building Services — custom home building process

Our Construction Roadmap

The Blaise Custom Home Building Process in Sydney

Blaise Building Services delivers custom residential builds through a disciplined, five-step custom home building process in Sydney. Led by director Stephane Blaise, our system is designed to resolve every specification on paper before we step on site.

We combine early cost-modelling with rigorous on-site quality controls, including three independent Blower Door Tests, to guarantee certified Passive House performance.

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.

Book Your On-Site Feasibility Study

No Surprises

Five Steps. Zero Surprises.

Most cost overruns and project delays in residential construction do not start during construction. They are created in the months before site preparation begins — in unresolved details, deferred specifications, and decisions left to be made on site when they are at their most expensive.

We have structured our high-performance home-building process to eliminate these risks before they arise. By resolving every structural and financial detail on paper, we ensure you sign a construction contract based on documented reality, providing absolute budget certainty and a smooth build timeline.

All details resolved on paper first

Fixed-price contract before site start

3 independent Blower Door Tests

Daily WunderBuild site updates

DA & CC approvals managed

6-year construction warranty

From Consultation to Handover

Our Five-Step Project Roadmap

On-Site Feasibility Study

Stephane Blaise spends one hour on your property evaluating geotech constraints, solar access, council planning overlays, and your structural brief. This initial paid consultation qualifies your project and determines site suitability before any design fees are incurred.

Request Your Feasibility Study

Early Contractor Involvement (ECI)

We form an early collaboration with your architect during schematic design, providing cost, detailing, and constructability feedback while your designs are still on paper. This stage produces a Quick Building Estimate (QBE) to ensure your drawings stay within budget.

Learn How We Model Your Budget

Cost-Modelling, Contract & Approvals

We prepare a detailed estimate using 3D SketchUp modelling and automated takeoffs. We resolve all material specifications, details, and timelines for the final fixed-price contract, then manage the entire council DA and CC approvals process on your behalf.

Managed Construction

Your construction phase is managed in real time through our cloud-based WunderBuild client portal. You receive daily site photos, progress updates, and schedule tracking. We conduct three independent Blower Door Tests at framing, services rough-in, and lock-up to verify airtightness at every critical stage.

Performance Verification & Handover

Handover is a verified physical outcome. We conduct a final certified Blower Door Test to confirm your home meets Passive House standards. You receive a Home Operational Manual, a guided walk-through with Stephane, a 13-week post-handover maintenance programme, and our 6-year construction warranty.

Building Insights

High-Performance Building Insights

To help you navigate pre-construction, Stephane has outlined how our process protects your custom project.

What is the step-by-step process of building a Passive House in Sydney?

It requires a continuous, highly detailed pre-construction phase. We begin with a site feasibility audit, move into ECI design reviews to prevent budget blowouts, lock in material specifications, and execute the build to Passivhaus standards, verifying airtightness with three physical Blower Door Tests.

How do builders prevent cost overruns on a high-end custom home?

By resolving constructability and material selections before construction starts. Our estimating process and QBE cost modelling give your architect a realistic budget framework during the design stage, ensuring we sign a contract based on detailed takeoffs rather than speculation.

Why does Passive House construction need three Blower Door Tests instead of one?

Because airtightness is easy to secure during the structural framing stage, but extremely difficult and expensive to remediate after lock-up. By testing at framing, services rough-in, and lock-up, we catch and seal any structural air leaks when they are cheap and easy to resolve.

Common Questions

Honest Answers to Our Process FAQs

Navigating a custom home build requires complete clarity on timelines, visibility, and management.

Access Our Complete FAQs

How long does the entire custom home process take?

On average, a custom Passive House project requires four to eight months for the pre-construction and approval phase, followed by twelve to eighteen months for on-site construction. This ensures every detail is resolved on paper before we start digging, protecting your budget.

What visibility do I have during the construction phase?

You have complete project transparency through our WunderBuild portal. This cloud-based system gives you daily access to your project's real-time schedule, financial progress claims, site photos, and direct communication with Stephane.

How does your team handle council DA approvals?

We coordinate the entire DA and construction certificate process, working alongside your architect to submit comprehensive, Passive-House-compliant documentation. We understand local Eastern Suburbs council requirements, ensuring your approvals move forward smoothly.

Take the First Step

Initiate Your Project with Absolute Certainty

Do not leave your custom build's timeline or budget to chance. Book an On-Site Feasibility Study with Stephane Blaise today — the first step in our high-performance delivery process.

Request Your Project 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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