Certified Passive House Builder · Launceston & Bridport

Passive House standards. Every build.

From first homes to fully custom architectural builds, every OTJ home gets the airtight, properly detailed workmanship Passive House demands. You don’t need a certified Passive House to get a warmer, quieter home that’s cheaper to run.

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What We Do

Our Services

From the ground up or room by room — built to a standard you can trust.

Custom Architectural Builds

Custom residential homes built from the ground up, designed around how you live.

Certified Passive House

Warmer, cooler, quieter, cheaper-to-run homes — high performance as standard, not an upgrade.

Heritage Restoration

Careful restoration of older Tasmanian homes, keeping the character while lifting performance.

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Oscar Tregaskis-Jago, Director of OTJ Building Tas

Why OTJ

Why Clients Choose Us

Certified Passive House tradesman — genuinely warmer, cooler, quieter and cheaper to run, not just marketed as "efficient"
Proper condensation control and airtight detailing — the unglamorous work that stops mould, mildew and rot before they start
An organised, clean site from day one — every tool has its place, materials protected throughout
Formal pricing and a clear variation process — you know the cost before anything changes, so there are no surprises

Client Review

“We recently completed renovations with Oscar and the OTJ Building team and were impressed with their service and attention to detail. Oscar managed all the trades efficiently and even came to the house after hours when we had a leak to help problem solve and get it fixed. Oscar is passionate about building high quality homes and is really approachable, even with our young kids around he managed to keep the work up and make them laugh! I would work with Oscar again.”
Michael Loubser · Renovation client, Google review

Common Questions

Your Questions Answered

What areas do you build in?

All of Northern Tasmania, from Launceston and the Tamar Valley through to Bridport and the North East. If you're not sure whether your site is in range, get in touch and we'll talk it through.

How much does a new build or renovation cost?

As a guide, first homes and investment builds start from $2,250/m², and custom architectural builds range from $4,500/m² to $8,000/m² depending on the design, site and finishes. Renovations and extensions are priced per project. Every job gets a formal written quote before any work starts, so you know the number up front. Try our free price calculator.

Are you licensed and insured?

Yes. OTJ Building Tas holds a Tasmanian Building Services Provider licence (No. 786933135) and full public liability and construction insurance, with certificates available on request.

Do I have to build a certified Passive House to work with you?

No. Full certification is an option if you want it, but it isn't a requirement. I've been a certified Passive House tradesman for 3+ years, and that standard of workmanship (airtightness, insulation, condensation control) goes into every job regardless of budget: first homes, custom builds and renovations alike.

What stage do I need to be at before I contact you?

Any stage — from owning land with no plans yet, through to fully engineered architectural drawings ready to build. Our enquiry form asks where you're at so we can point you in the right direction.