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Every eHaus is guaranteed to save Carbon through energy savings.

Reducing our Carbon is high on the agenda, and rightly so. In light of the global climate crisis that we face, it's important to know how the choices that we make effect our environment – and the homes that we live in should be no exception. Because of the way every eHaus is designed and constructed, we know and can measure the amount of carbon through energy efficiency that we are saving per year, and we think that's pretty cool. To date all eHaus builds have saved a combined total 1,867,702kg of carbon. That's as much as 10,859 roadies from Auckland to Wellington!

Carbon, so everyone can picture it

To put our carbon savings into context, we've calculated the carbon spent travelling so you can compare just how much of a difference every eHaus is making.

2,930kg CO2

A return trip from Auckland to LA

172kg CO2

A roadie from Wellington to Auckland

180kg CO2

Flying from Christchurch to Auckland

eHaus and carbon

Minimising fossil fuel consumption is a huge issue to navigate, but building a high performing home isn’t. When you choose an eHaus you are choosing far more than an incredible family home, you are choosing to make a difference for the planet and future generations. Building an eHaus makes you part of the solution with significant carbon savings. We are committed to providing solutions and believe the science behind the carbon debate is right.

What we're measuring

Let's give you a better picture of what we're talking about when we say "eHaus' are saving carbon". Take your average kiwi code-built home. A home like this needs approximately 20kWh of heating per room in the winter each day. By comparison, an eHaus needs only 2kWh per room each day. Of course the carbon emitted depends on the heat source, if it is gas it will consume more carbon than electricity, but let’s stick with electricity for this example which is what we've done here. Each kWh of electricity used equates to 130grams of carbon currently in NZ. So, for yearly heating, the standard code-built home emits approximately 260kg of carbon compared to just 26Kg in an eHaus.

How we've measured it

The carbon calculations have been extracted from data in the Passive House Planning Package (PHPP) and based on the eHaus model built in Whanganui. From this, we know that a typical code built equivalent new house will require 120kW(m2a) to maintain internal temperatures above 20C. We have used the GT data in the PHPP to enable a direct comparison to be made in each region where the home was built. NB: This data references the savings from heating only. Further carbon savings have not been considered from efficient hot water heating, on site power generation, LED lighting etc. The energy used is electricity and the carbon component per kW is taken from the website with a figure of 0.00013 grams of carbon per kWh Petrol emissions data 0.234KG/Km is from same source.

We work with other clever people to reduce embodied carbon in our homes

We can't get away from the reality that it takes energy to make things, but like anything, we can do our bit to reduce our impact when we construct an eHaus. We work with clever people to lay low carbon concrete, helping to save tonnes in carbon emissions with every slab poured, and carpets that are plastic-free and invest in sustainable production practices. We still have work to do to in this area, but we are committed to doing what we can to reduce carbon in the construction of our homes.

Every eHaus project has their own carbon piggy bank, tucking away their savings for a better environment.

We've calculated the amount of carbon saved for every eHaus from the day the owner's moved in! Check out our projects to see just how much carbon each eHaus is saving per year.

View our projects
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