Six bedrooms, 25-seat home cinema, indoor pool, steam room, sauna, hot tub… yet the same carbon footprint as the average two-bed flat? Welcome to the world of sustainable luxury.
Until recently it was assumed that there was little interest in green credentials from buyers in the luxury property market.
But then things started to change, with the trend-setting celebrity class starting to greenovate their homes, with the likes of Orlando Bloom, Cate Blanchett, and even Larry Hagman (who played oil tycoon JR in Dallas) going 'off-grid'.
But, outside from the world of celebrity, is everyone else really demanding location, privacy, and geothermal heating?
Green and pleasant lands
Paul Lavelle, the polar explorer and eco-entrepreneur behind Barnsley Hill Farm, which is claimed to be the UK's most advanced ecological home, says that, yes, high net-worth individuals are now taking green credentials extremely seriously.
"People have been hugely interested in the house. We had about 500 people attend the open day. It does shock people at first - they think it's going to be a hobbit house."
With six bedrooms, over 6,000 square feet, a 25-seat cinema, an indoor swimming pool, sauna, steam room and eight-seat hot tub, this conversion of a 400 year old farmhouse would be home to a very lucky hobbit indeed.
But, despite the indulgent spec, Barnsley Hill Farm's carbon footprint is roughly equivalent to that of a two-bed flat.
And, says Paul, that really does matter.
"In this country people produce about 10 tonnes of carbon dioxide emissions per year. But if you're the sort of person who lives in a big house, and regularly flies around the world, that could go up to 100 tonnes.
"And there is a guilt factor. You just have to look at how many people are driving a Prius now.
"You can be open to a lot of criticism. I was clearing snow from outside my house recently when a neighbour made a comment about the energy consumption of my pool.
"But here, at Barnsley Hill Farm, you can lie in the pool and know that you're producing virtually no carbon dioxide. It's wonderful.
"People are worried about the bills for a place like this too. If it were traditionally built it would probably cost about £8,000 a year to heat. But, because this is airtight, it will be a just a few hundred a year."
Paul's innovative design and build company, Stonebee Developments, is currently in talks with RIBA over applying his techniques to other dwellings.
"We're hoping to build three houses. They'll be small and affordable, but utterly gorgeous."
London Luxury
For those who prefer city living, Morpheus Developments have the answer. And they call it 'sustainable luxury'.
At locations based around prime central London sites, they have incorporated green goodies such as geothermal boreholes, air-source heat pumps, solar panels and rainwater irrigation into their developments.
Andrew Murray, founder of Morpheus, explains, "There is an enormous amount of waste generated in the building industry, and our homes are responsible for a significant part of this country's consumption of resources, notably energy.
"As developers, it seems only natural to respond by reducing the amount of materials we use, employ renewable resources in construction and, looking forward, limit the energy needs of the home and offer the end-user a sustainable energy option."
But a Morpheus development is hardly what most people would think of as a traditional eco home.
Blending extravagance, using materials that include marble, suede and cashmere, with technology, such as mobile phone remote management, and number plate recognition systems, they aim to create something close to perfection.
"Our expertise is in combining these often perceived to be conflicting aims," says Andrew. "We have coined the term 'sustainable luxury' to encapsulate that philosophy."
But these are not self-consciously sustainable buildings.
"Our clients have bought Morpheus properties because of their design, quality, luxuriousness and location," admits Andrew.
"The eco elements we have specified have been a bonus rather than the main reason behind their purchase. The only way people are going to know that the properties are green is if the owner tells them."
Eco Self build
The self-build market has boomed in recent times, with eco worriers leading the way and boosting sales of solar panels, wind turbines and hemp insulation.
And, for those that aren't so willing to don a hard hat themselves, there has been the growing trend for kit houses that are constructed for you, led by the iconic German Huf Haus.
The modernist glass and steel Huf Haus has always been energy efficient, but, as of this year, all properties are also now close to zero carbon.
Afra Bindewald from Huf says, "The technology has been available in Germany for a few years but we feel the market is ready to accept it now here.
"Basically we're preparing for 2016 when we won't have a choice, when the rules and regulations will demand that all new homes are zero carbon.
"In Germany they've already changed. So we're saying why give our UK clients a different product?"
But are the extra insulation, the air and ground-source pumps and the solar voltaic panels simply seen by their clients as a nice-to-have?
"No, our clients are very interested in how we build and the green technologies. At the moment everyone's asking about rainwater harvesting.
"Clients don't just come to us for the architecture. Usually the second or third question they ask is how much will I save on my energy bill.
"We would like to encourage everybody not just to look at the architecture, but to also look at the ecological soundness of a home. Everyone has a responsibility."