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Comparing the Car and Construction Industry

Comparing the Car and Construction Industry

Driving Up Quality

Originally published in Issue 15 of Insulate Magazine. Read this article and other insulation insights here.

Car manufacturers have long sold their products on the basis of fuel efficiency and emissions, despite most paying customers knowing they won’t achieve those figures. Similar awareness doesn’t yet exist for people looking to buy a new home, but do changes in the automotive industry hint at a different future in construction? by Paul Forrester

A 2014 edition of Audi Magazine, the customer magazine of Audi UK, carried an article about fuel performance and carbon dioxide emissions figures for cars. As well as describing how the tests are carried out, there was also an explanation of the usefulness of the results.

It made for interesting reading, not least because of the openness with which it talked about how little relevance the test figures had for what would be achieved on the road. The other striking thing about the piece was how much resemblance its content bore to the construction industry.

Controlled conditions

Tests must be in strict adherence with European guidelines and have to be done in laboratory conditions because the infinite variations in road conditions, weather and driving style would make it impossible to test one vehicle against another in the real world.

The in-situ testing of construction is almost non-existent, with assessment being based around software, paperwork and the limited policing of translating design intent to site. Statements such as, it is not practical to test every new car brought to mind building regulations that allow acoustic or air pressure testing of a sample of dwelling types.

In explaining how the figures are for guidance only – but that they allow for a comparison between models from one manufacturer or different manufacturers – it was impossible not to think of SAP and SBEM calculations being used to assess building compliance, and Energy Performance Certificates rating performance without accounting for occupant behaviour.

Uncovering truth

Of course, not long after the article’s publication, the Volkswagen Group became engulfed in a scandal of its own making through the revelations that it cheated emissions tests.

With hindsight, it’s easy to be sceptical about any apparent good intent in the magazine article because Audi is part of the VW Group. In truth, however, any car manufacturer could have written it, so the validity of comparisons between the automotive and construction industries isn’t diminished.

If anything, the existence of an even bigger performance gap between a car’s lab results and road performance only serves to make the comparisons more relevant.

The reality of building performance is that energy use is typically 30% higher once constructed than was predicted at design stage. That is far too big a discrepancy to be explained away by ‘infinite variations’ of occupant behaviour, or site location and weather conditions.

In-post with Insulate Network

Strength of feeling?

Once the full extent of the VW scandal became clear, it was not uncommon to hear suggestions that the performance of buildings – and housing specifically – should be highlighted as a similar scandal in an effort to raise public awareness.

How outraged were people really, though? In 2016, the VW Group became the number one car manufacturer in the world in terms of sales. While some of that could be attributed to growth in China, it also suggested that other qualities of the brand were enough to keep some – if not all – of its existing customers.

The picture has started to change more recently, though. 2018 has brought reports of a reduction in sales of diesel cars generally. The VW issue is seen as part of that, but the biggest driver (pun intended) has been the messages coming from Government.

A taxing problem

Talk of higher taxes on diesels – because of pollutants other than carbon dioxide – and eventual outright bans as part of tackling climate change, lead to the inevitable question: why would anybody buy a diesel car right now?

And because this is a magazine about insulation and construction, another question is: could a similar fate befall buildings that don’t deliver their designed performance?

Already it feels like the tide could be starting to turn. Stories about defect-ridden new homes seem to feature in the mainstream media increasingly often. While that may not be enough to fire widespread public anger, it can only add to the pressure that is starting to come from a few voices in the corridors of power for the delivery of better quality construction.

Supply and demand

In the automotive industry the tide has largely turned. There are more than enough cars to meet demand, so car companies now need to invest in an alternative vision of the future. VW have committed to 70 billion Euros of investment in a shift towards electric vehicles.

In construction, the incentive for volume housebuilders to compete with one another for an alternative vision doesn’t yet exist. 60% of new houses are built by just ten companies; there are far too few houses to meet demand.

Questioning the suitability of current housing stock in a similar way to questioning diesel cars would risk further damaging a housing market that the Government already acknowledges is broken.

Why would anybody buy a diesel car right now? That’s not for Insulate magazine to worry about, but we can wonder about the day that low energy construction becomes the norm – whether through public or official pressure – and there’s a legitimate case for asking,

Why would anybody buy an inefficient home right now?

The Car and Construction Industry

What are you thoughts on the comparisons made between the car and construction industry? Do you agree – please share your thoughts and comments below and join the insulate debate


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  1. Interesting comparison, but the biggest difference between the industries is that cars are built in factories, buildings are built in-situ. Maybe the move to off-site construction methods will lead to a closing of the performance gap?

  2. Agree entirely with Rob Cartwright. Additionally, another vital difference is that people buy homes primarily as somewhere “nice” to live, where they can breed, relax and “feel at home”. But cars are seen much more as status symbols. People’s reactions to the pollution and energy consumption of both is coloured by this fundamantal difference in basic feelings. Perhaps their reactions to a new boiler and a new car are much more alike, with spurious claims causing equal outrage. This is where parallel approaches will probably start in housing, leading from boilers to the total heating system and then (at last) to the construction of the building itself.
    A worthwhile regulatory approach would be to require the performance of both cars and buildings to be of the essence of, and quoted in, the purchasing conditions, so that there could be either a statutory offence or a civil action when non-compliance is demonstrated. The problem with this, agreed, is that pollution and energy consumption of cars and houses alike depends acutely on how they are used, so housing would need a standardised as-built test system analagous to a car’s fuel consumption tests under different driving conditions.
    Lots of work for a new breed of solicitors??

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