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As well as our Design and Build Service we provide a number of design services that can aid you during your next project, whatever stage of the project you are at.
Energy ModellingCraft Homes provides expert Energy Modelling services in New Zealand, helping homeowners, builders, architects, and developers create warm, dry, healthy, and energy-efficient homes. Energy Modelling uses specialised computer software to simulate how a building performs within its specific site location and climate zone, allowing us to predict energy use, thermal comfort, heating and cooling demand, and overall building efficiency.
By analysing key elements such as insulation, glazing, thermal bridging, orientation, ventilation, shading, and construction methods, we deliver accurate insights that support better design decisions, smoother compliance, and higher-performing homes 
Typical areas of Heat Loss in an Uninsulated House - Insulation | BRANZ
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GET IN TOUCH WITH THE TEAM TODAYCall Toby directly on 021 025 53091 or fill in the form below: |
Why Energy Modelling Matters
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1 Ensures your building meets or exceeds NZ energy efficiency requirements. |
2 Reduces long-term energy costs through optimised design. |
3 Identifies performance issues before construction begins. |
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4 Supports sustainability goals and certification pathways like Passive House and Homestar. |
5 Helps create a healthier, more comfortable living environment by delivering spaces that heat up with little energy and stay warm and dry in winter and cool in summer. |
Energy Modelling Services for Homeowners
Performance assessment of proposed designs We can model the expected performance of a house plan you already have, giving you clear insights into heating demand and heating loads for the cold season, overheating -if any present- during the warmer months, insulation and joinery performance. We will provide you with an easy to read report with our recommendations for the design. |
Custom energy-efficient design We can help create a new design optimised for your lifestyle, climate zone, specific site location conditions, and long-term energy savings, as well as designing for superior indoor air quality and ventilation. |
Renovation guidance We provide performance reports for existing homes, helping you prioritise upgrades and spend your renovation budget where it will have the greatest impact. |
Energy Modelling Services for Builders, Architects, Designers & Developers
NZBC H1 Compliance through the ‘Energy Modelling’ pathway We use the Passivhaus Planning Package (PHPP) which is a predictive energy modelling software accepted under H1/VM1 to help you navigate the New Zealand Building Code H1 Energy Efficiency requirements with clarity and confidence. You can submit our Performance Report from PHPP alongside your Building Consent documentation for Council. |
Passive House & Homestar Support Whether you're aiming for lower energy use or full certification, we provide the modelling and documentation required to meet Passive House or Homestar standards. |
Performance reports for existing dwellings We assess current building performance to guide renovation planning, identify cost-effective improvements, and support high-performance upgrade strategies. |
Finding a Site & Site Assessment
We can help you find land that suits your vision and your budget — from orientation that maximises views and natural light to careful consideration of wind direction and shading. We gather all the relevant data so you can make an informed decision as to whether the site fits your aspirations for the project.
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Granny Flats / Minor Dwellings
Recent rule changes have made it easier to build minor dwellings — often called granny flats — near existing homes. We can help you navigate these new requirements and design a high-performing, well-planned dwelling of 70m² or less for family, extended family, or additional rental income.
Blower Door Testing
Our director, Toby Tilsley, is an Air Tightness Testing and Measuring Association (ATTMA) registered air tightness tester, certified to test buildings up to 4000m³ gross envelope volume.
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Air tightness testing — commonly known as blower door testing — measures how well a building is sealed by using a specialised fan to create a pressure difference. This reveals air leaks, allowing improvements to energy efficiency, comfort, and indoor air quality.
During the test, all exterior openings (windows, doors, etc.) are sealed except for the blower door and fan. When the fan runs, it measures airflow and calculates the building’s air leakage rate, often expressed as ACH50 (air changes per hour at 50 Pascals). |
Blower door testing can be used for:
New buildings Ensuring air tightness standards are met and identifying issues before they’re covered up. |
Existing buildings Assessing older homes and locating problem areas for improvement. |
Passive House certification An essential requirement for achieving Passive House levels of airtightness. |
Ductwork testing Evaluating the airtightness of duct systems. |
Why Choose Craft Homes?
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1 Specialist knowledge of NZ climate zones and high-performance building methods. |
2 Detailed, accurate modelling using industry-trusted tools. |
3 Clear, actionable reports designed for both homeowners and industry professionals. |
4 Support from concept design through to compliance and certification. |
Craft Homes is committed to helping you build smarter, healthier, and more energy-efficient homes through expert, data-driven modelling. Let us help bring your project to life with clarity, precision, and performance-focused design.
SEE WHAT OTHER CLIENTS ARE SAYING
We are so proud of the feedback we get from our customers, so we thought we’d share a few of the testimonials we’ve received. We always finish on great terms with our clients, so if you would like to speak to one of our customers directly, just ask and we can put you in touch.
Myles Henaghan"The best decision of the whole project was to work with Toby and the Craft team. From day one he demonstrated an eye for detail, high standards and an 'anything is possible' attitude. A lasting impression we have is one of trust and partnership. On numerous occasions, he raised challenges, presented solutions and always listened to our point of view. Craft Homes - they know what they're doing and have a ferocious work ethic!" |
Mr And Mrs Spence"We would have no hesitation is recommending Toby. We love our new home and that is due to the high level of skill and precision delivered by Toby and his team. He remained on the job until everything was perfect." |
How do I get started?
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