Service
Sustainable and energy-efficient home builders
Solar on a leaky house is money spent in the wrong order: the envelope comes first, every time. And summer overheating is a design decision — orientation, shading, cross-ventilation — not something an appliance fixes afterwards.
- Licence checked
- Insurance sighted
- Solvency re-checked
When this is the right path, and when it is not
You are prepared to spend at design stage on envelope and orientation rather than on appliances later.
It goes wrong when performance is bought as equipment at the end, or when the builder has not detailed for airtightness before.
How the job actually runs
- 01Start with orientation and envelope
Insulation, glazing, airtightness and which way the living areas face do more than any appliance. They are also nearly impossible to retrofit.
- 02Understand your energy rating obligation
New homes must meet a minimum energy rating. Going beyond it is a choice, and the marginal cost falls the earlier you decide.
- 03Decide all-electric early
Removing the gas connection changes the appliance schedule, the switchboard and sometimes the solar and battery sizing.
- 04Model before you build
Thermal modelling shows what actually moves the number for your design on your block. It routinely contradicts intuition.
Where these jobs go wrong
What most often costs people money on a sustainable home specifically.
- Buying appliances instead of envelope
Solar on a leaky house is money spent in the wrong order. The envelope comes first, every time.
- Treating the minimum rating as a target
The minimum is a floor, not a goal, and the cheapest time to exceed it is at design.
- Forgetting summer
Australian designs fail more often on overheating than on winter heating. Shading and cross-ventilation matter as much as insulation.
- Choosing a builder without the detail experience
Airtightness and thermal-bridge detailing are craft skills. A builder who has not done it will build to the drawing and miss the performance.
What actually makes a house cheap to run
Orientation and glazing do more than any product on a brochure
The performance of a house is largely settled by where it sits on the block and where its glass is. North-facing living areas with eaves sized to admit winter sun and exclude summer sun, restrained west-facing glazing, and a plan that allows cross-ventilation will outperform an identically specified house turned ninety degrees. These decisions cost nothing at the sketch stage and cannot be bought back later. A package that adds equipment to a poorly oriented plan is selling you compensation for a problem that did not need to exist.
The building fabric is the part you cannot upgrade later
Insulation continuity, thermal breaks in the frame, air-tightness, glazing type and the treatment of junctions are all buried in the finished house. Equipment — the hot water system, the air conditioner, the solar array, the battery — is replaceable on a ten to fifteen year cycle and gets cheaper over time. Spending the budget on fabric first and equipment second is the order that survives contact with the next decade, and it is the reverse of how most “sustainable” inclusion lists are written.
A thermal rating and an energy budget are two different tests
Australian residential energy assessment now asks two separate questions: how the building envelope performs thermally, expressed as a star rating from accredited software, and how the whole house performs once its fixed appliances and any on-site generation are counted. A house can move one of those numbers without moving the other — adding solar helps the second and does nothing for the first. Ask which test a claim refers to, because “high performance” used without naming the test is not a claim that can be checked.
Sustainable and low-running-cost are not automatically the same argument
Embodied carbon in materials, durability, water use, and what happens to the building at end of life are genuine considerations and they do not always point the same way as the energy bill. A concrete slab with high thermal mass may help the running cost and hurt the embodied figure. Deciding which of these you are actually optimising for, and saying so in the brief, is what separates a design conversation from a fixtures list — and it is a conversation worth having before you compare quotes, because the quotes will not be comparable otherwise.
What moves the price
No figures — a number without your site and your specification is a guess. For a sustainable homes job, these are what actually move it.
- Insulation and thermal bridging detail
- Glazing specification and shading
- Airtightness and mechanical ventilation
- Solar, battery and switchboard
- All-electric appliance schedule
- Thermal performance modelling
Where we cover this, and what the planning data says
Mapped constraints is the control that most often decides how a sustainable homes job runs. Read from state planning data.
| Suburb | Council | Mapped constraints |
|---|---|---|
| Berrima | Wingecarribee Shire Council | 5 |
| Bowral | Wingecarribee Shire Council | 4 |
| Bundanoon | Wingecarribee Shire Council | 3 |
| Burradoo | Wingecarribee Shire Council | 4 |
| Capertee | Lithgow City Council | 3 |
| Fitzroy Falls | Wingecarribee Shire Council | 1 |
| Gulgong | Mid-Western Regional Council | 2 |
| Hartley | Lithgow City Council | 2 |
| Kangaloon | Wingecarribee Shire Council | 2 |
| Lithgow | Lithgow City Council | 3 |
| Mittagong | Wingecarribee Shire Council | 3 |
| Mudgee | Mid-Western Regional Council | 2 |
| Portland | Lithgow City Council | 3 |
| Robertson | Wingecarribee Shire Council | 3 |
| Rylstone | Mid-Western Regional Council | 2 |
| Wallerawang | Lithgow City Council | 3 |
| Mudgeeraba | City of Gold Coast | 8 |
| Palmwoods | Sunshine Coast Council | 4 |
| Woombye | Sunshine Coast Council | 4 |
| Worongary | City of Gold Coast | 5 |
| Cygnet | Huon Valley | 7 |
| Gisborne | Macedon Ranges Shire Council | 10 |
| Healesville | Yarra Ranges Council | 8 |
| Woodend | Macedon Ranges Shire Council | 9 |
| Denmark | Shire of Denmark | 2 |
Suburb-level, read from state planning data. Not a report on any individual block.
What to ask a builder about a sustainable home
Specific to this kind of job. The general list is in questions to ask a builder.
- Have you built to an airtightness target, and do you test it?
- How do you detail thermal bridging at slab edge, junctions and openings?
- Who does the thermal modelling, and can I see the results before we lock the design?
- What is your experience with all-electric — switchboard, appliance schedule, solar and battery?
- Can I speak to an owner of a house you built to this standard a year or more ago?
Related
Questions people ask
Does a sustainable home cost more?
Upfront, generally yes; over the life of the house the calculation changes. We will not put a payback figure on it, because it depends on your design, your climate zone and your energy prices.
What is an all-electric home?
One with no gas connection — induction cooking, heat-pump hot water and reverse-cycle heating. It removes the supply charge and pairs well with solar.
Is passive house achievable in Australia?
Yes, and there are certified examples in most states. It is a rigorous standard and it needs a builder who has done it, not one who is willing to try.
The mechanism
One recommendation, not six quotes
We are a builder broker. Every builder passes the Four-Point Builder Check™: licence checked on the state regulator's own register, insurance sighted rather than self-declared, solvency re-checked on a schedule, and confirmed they take on sustainable homes work in your suburb specifically.
Find sustainable and energy-efficient home builders — free →
Free · about 3 minutes · no obligation · your details are never sold
Free to you because the builder pays a success fee, and only once you sign — how we are paid. Your brief goes to the builder we match you with and to nobody else — what happens to your details. No contract with us and nothing to cancel. Checking a builder yourself takes about five minutes and we would rather you did: how to check a licence.
Sustainable and energy-efficient home builders near you
Tell us about the job and where it is. We'll find builders who do this specific work in your suburb — or say plainly that we can't yet. Free to you: the builder pays us, and only if you sign.
Find sustainable and energy-efficient home builders →