This issue’s international selection features a developer-built passive house in Philadelphia, a big new research centre in Frankfurt, a sleek family home in Vienna, and a new low-energy factory in Canada where passive timber buildings will be prefabricated.

Six years after it was completed, Passive House Plus takes a look at a pioneering low energy upgrade that went on to become the UK’s first certified Enerphit project, to find out how it has performed — and what lessons have been learned.

Built in the 1970s, Rochestown House was a cramped, cold and damp social housing block in Sallynoggin, Co Dublin that has now been completely transformed, thanks to a deep energy retrofit inspired by passive house principles.

From a distance Steel Farm looks like a traditional Northumberland farmhouse, with its sandstone exterior and cluster of outbuildings. But inside, it is something very different.

When Mike Jacob of Trunk Low Energy Building started planning to build this unique Essex home, it seemed likely to run way over budget, and still fail to meet the passive house standard. But rethinking key details and making tough compromises got the house within touching distance of passive, while slashing costs.

Safeguarding historic documents and other artefacts requires stable building conditions. Until now this was usually achieved with the expensive and energy-hogging use of heating and cooling equipment, but a new approach by Herefordshire Council used the passive house approach to conserve energy, money — and the county’s precious historical archives.

Building this stylish south Dublin passive house, which recently picked up a Made in Germany energy efficiency award, demanded a steep learning curve, not least when it came to airtightness — but despite the struggles, it ultimately gave its owners their dream low energy home.
Words: Des Crabbe, architectural technologist, OA Studios

Motivated by the experience of building and living in a passive house, one of Ireland’s leading political figures has become a public advocate for the standard. Passive House Plus visited the house to find out why.

Late last summer, work finished on architect Paul McNally’s latest super low energy project: a three-storey building in Tipperary that has just become Ireland’s first certified passive house pharmacy.

This issue’s international selection of passive and low energy building includes two homes built for retirement —one in Austria, one in New Mexico — a striking house in a Romanian forest, and an out-of-this-world passive-certified dome in tropical south-west China.

Low energy building isn’t complicated, but it’s easy to get wrong. Since Irish house builders downed tools en masse when the last boom ended, energy efficiency standards for new homes have seen unprecedented rises of 40% in 2008 and 60% in 2011, shooting far ahead of the UK. But with signs of a new boom emerging, can the industry get to grips with this brave new world of insulation, airtightness and thermal bridging and deliver healthy low-energy homes — or are damp and mould set to become the norm in new build?

The Passive House Institute’s announcement of new classes of passive house certification – including renewable energy generation – at this year’s International Passive House Conference caused something of a stir. Dr Benjamin Krick, the institute’s head of component certification sheds some light on the new classes and explains the rationale behind proposals which may set up passive house for a fabric first approach to near – and sub – zero energy building.

A passive retrofit in Co Meath offers a template that could be applied across much of the Irish housing stock: a long, dark, 1970s bungalow was transformed into a bright modern home that’s now warm and comfortable.

When Sjölander da Cruz Architects sought to turn an old abestos-clad shed into the firm’s new studio, it offered the perfect opportunity to put an enthusiasm for passive house design into practice.

A new development in Tipperary aimed to combine excellent levels of airtightness and insulation with generous glazing and natural ventilation to deliver ultra-modern, comfortable, low energy offices. How did it work out?

The eco-village at Cloughjordan, Co Tipperary is no stranger to low energy buildings, and with this passive house, architect Paul McNally of The Passivhaus Architecture Company set out to prove that energy efficiency and good architecture go hand-in-hand.

For Ruth Busbridge and her builder Mike Whitfield, aiming for the passive house standard was just one part of an environmentally conscious approach that put natural, healthy materials to the fore.

Three award-winning affordable homes in scenic North Norfolk have achieved passive certification while embracing a unique local style of architecture.

This issue’s selection features ultra low energy buildings from Mexico, Germany, New Zealand and Italy, and illustrates how widely the energy efficiency specification can vary in different climate zones.

A building’s airtightness test result isn’t just an indicator of its energy efficiency – it’s an unambiguous indicator of build quality. With a little care in design and on site, airtightness targets that may seem impossibly tough are anything but, argues leading architect and certified passive house designer Simon McGuinness.

If you’ve ever wanted to take a passive house for a road test, one holiday letting on the coast of west Cork may be too good an opportunity to turn down. The aptly named Sea Spray – an as yet uncertified Enerphit upgraded bungalow – is a bona fide triumph in the face of adversity.

Hitting Enerphit – the passive house standard for retrofits – wasn’t challenging enough for one Yorkshire retrofit project. The team also had to stop the building falling down, and avoid wholesale changes to the building’s external appearance.

How can a house embrace passive solar principles when all the sun’s heat and light is to the south — but all the best views are to the north? This striking home on the Connemara coast employed some clever solutions.

A simple building form, few junctions and minimal surface area are some of the cornerstones of passive house design — but as this spectacular certified passive house in Co Meath proves, rules are made to be broken.