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Construction waste is costing clients, end-users and the overall economy hundreds of millions of pounds a year, yet it is largely overlooked by the industry. The tide is slowly turning as major contractors and some leading clients tackle the issues. Developer Land Securities, for instance, has set a target to reuse or recycle 80% of demolition and construction waste, by weight, in 2007/08 and has an ultimate goal of 90%. Similarly, Defence Estates is acting to reduce on-site waste on its 拢1bn SLAM (single living accommodation modernisation) project by using factory-built modules.

How these and other examples of good practice can be disseminated to the wider industry was one of the issues occupying the minds of experts at a forum held in London鈥檚 Swiss Re building earlier this month.

An estimated 20 million tonnes of unused waste material goes to landfill each year, which, as one attendee remarked, was 鈥渄own to our culture鈥�. He added: 鈥淭he UK is the largest user of landfill in Europe. For many people, it is easier to put waste into a landfill site than think about how it can be reduced.鈥�

Wrap says action needs to be taken on both materials coming in and the materials going out of the gates of a site. The aim should be to arrive at a neutral waste position, whereby the value of construction materials wasted and going to landfill is equal to the value of extra reused or recycled materials coming on to a project.

Our profligacy will soon be clamped down on. From March 2008, every project valued at more than 拢250,000 must include a site waste management plan (SWMP), a statutory requirement aimed at cutting the environmental impact of unnecessary waste. A further incentive for change is the escalating cost of landfill tax, which will double to 拢48 per tonne by 2010 for non-inert waste.

Influence on the supply chain

The forum was told that there were encouraging signs that the message was filtering down the supply chain. One delegate highlighted a project that had saved 拢300,000 in one year by the simple expedient of appointing two members of staff to be dedicated to minimising waste and sorting recyclable materials.

A similar tale was told regarding a mechanical and electrical contractor that saved 拢10,000 on one project purely by reducing the amount of packaging coming on site and the cost of skips to remove it.

Even so, for many organisations the issue of reducing waste has not been high on the agenda. This was put down to a multitude of reasons. One attendee said: 鈥淲aste management companies are happy to see as much waste as possible go to landfill because it is more money for them.鈥� Another added that he 鈥渕ight as well have been talking Russian鈥� when trying to discuss ways of reducing waste on a project with the architect and builder.

Also mentioned was the culture of contractors not worrying unduly about waste because it was included in their tender price and was therefore not directly going to cost them money - it would just hit the client.

Although it was acknowledged that action on waste is starting from a low base, there was general consensus that the 50% target was achievable. The only thing standing in its way was the fragmentation of the industry, a subject that prompted a variety of responses.

鈥淲e have to help contractors identify waste and show them how much it is costing them,鈥� said one delegate. Another added: 鈥淲e have to work all the way through the supply chain.鈥� Others recommended targeted measures. 鈥淭he design team has to be involved to design out waste before it gets to site,鈥� said one, while another pointed out: 鈥淢ost people respond to money 鈥� there must be a bonus or penalty system in place.鈥�

It was suggested that construction take a leaf out of the retail industry鈥檚 book. Supermarkets in particular have made great strides to reduce the amount of packaging on produce. One delegate commented: 鈥淚f we think back to three to five years ago, the awareness about waste is now a lot higher. Most retailers are vying to show they are doing more to reduce excessive packaging.鈥� He added: 鈥淪uppliers [to the construction industry] have a major role to play in achieving the 50% reduction.鈥�

Cross-industry support

It was also suggested that more needs to be done to encourage the entire industry to aim for waste neutrality and to 鈥渃lose the loop鈥� on recycling. It was forcefully argued that driving demand for recycled materials would make recovery and recycling more economic.

One delegate pointed to Germany as a good example of where materials are collected for recycling even before demand and the processes have been developed to reuse the waste. A case in point was the way plastics were hoarded until processes were devised to turn the waste into 鈥渘ew鈥� components, such as car bumpers or fleeces.

Given that the 30 largest firms represent less than 20% of the industry鈥檚 total workload, the diverse and fragmented nature of construction came in for much debate. It was deemed imperative that small and medium-sized enterprises (SMEs) were brought on board.

Bringing SMEs on board

All the delegates thought that SMEs, many of them with only five or so employees and at the bottom end of the food chain, would prove crucial in hitting the 50% target. But one comment summed up a dilemma on this: 鈥淧eople can understand health and safety issues because they know someone can either be injured or killed. Waste is a different matter.鈥� He added: 鈥淎 large part of the battle is getting people to understand waste and its implications. Once you get people thinking, you鈥檒l start to get solutions.鈥�

Nevertheless, the experts were divided on whether minimising waste should be written into contracts with smaller contractors. One noted: 鈥淐lauses in the contract can be very useful 鈥� often people don鈥檛 really know where to go to get advice.鈥� But another delegate remarked: 鈥淚f it gets down to looking at the contract, you鈥檝e already lost the game鈥�, and another added: 鈥淚t shouldn鈥檛 be about policing; it should be about supporting people.鈥�

There was almost unanimous approval that the onus was principally on clients, aided by the major contractors, to create a climate for change that could then cascade down through the rest of the industry. One attendee opined: 鈥淚f a client makes a commitment to reducing waste, it has to be monitored.鈥� A client attending the roundtable concurred: 鈥淭he whole thing is about having good site management. If the site is well managed, then it will not only have good records, but it will also be a clean and tidy site.鈥�

Credit: Tim Foster