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Just a few, as yet unclarified, sentences in a new piece of legislation are causing major waves throughout the property sector. The legislation is the Energy Act 2011, and the clauses in question grant powers to the government that will make it unlawful to let certain buildings by 2018.

All commercial buildings are now required to have an energy performance certificate (EPC) carried out by a qualified assessor when they are sold or leased. The EPC gives the building a rating of between A and G based on the energy efficiency of the building. The changes being brought in under the Energy Act mean that landlords with the least energy-efficient buildings, those with the ratings of F or G, will not be able to re-let those buildings beyond 1 April 2018.

Figures from the Department of Energy and Climate Change suggest that 18% of all commercial buildings in the UK would be affected by the legislation. No wonder the industry is calling for clarification. 鈥淭here are a lot of briefings taking place but there is not much to go on at the moment,鈥� says Patrick Brown, assistant director, sustainability and construction, at the British Property Federation. 鈥淭he government is not bound to make the threshold F and G rated buildings - it could be more draconian than that or it could be more lenient.鈥�

It is more than just the cut-off point that is focusing the minds of the property sector while it awaits detail on the government鈥檚 intentions. 鈥淔or example, will the legislation apply to all buildings from 1 April 2018, only new transactions from that date or only new transactions that involve a change of occupancy?鈥� asks Brown. The government also needs to consider the fact that many buildings are let on a shell-and-core basis and subsequently fitted out by a tenant. And an EPC rating achieved today may not be the same in 2018 because the rating mechanism is linked to Part L of the 黑洞社区 Regulations, which is to tighten in 2013.

With average lease lengths of 5.3 years in the commercial sector, the industry is already negotiating lets that will run through to 2018. The detail is needed now. Land Securities, the UK鈥檚 largest commercial property company, is not waiting and has set itself a target to bring its portfolio into line one year before the expected legislation kicks in. 鈥淲hatever happens with this particular legislation, this is a clear signpost as to where the government is headed,鈥� says Neil Pennell, head of engineering and sustainability at Land Securities. 鈥淲e want to be ahead of the game so that our properties are the ones that people choose first.鈥�

British Land is another that is busy greening its estate. 鈥淲e actively monitor and manage the energy consumption across our portfolio,鈥� says Justin Snoxall, head of the business group at British Land. 鈥淚n the last three years, we鈥檝e achieved a 27% reduction in like-for-like landlord-influenced energy consumption. And that鈥檚 been entirely done through better management and investment in initiatives with no more than a three-year payback.鈥�

So how tough will the new target be to achieve? 鈥淭he business community will have moved far beyond this rather unambitious legislative goalpost by then,鈥� says David Frise, head of sustainability at the 黑洞社区 & Engineering Services Association (B&ES). 鈥淢any tenants are already refusing to take on a building if it does not have an acceptable rating - and in the future we will see rents reflecting the increased value of energy-efficient buildings.鈥�

The M&E sector has a major role to play (see 鈥淨uick wins鈥�, right) in helping clients achieve these more valuable buildings by closing the gap between the forecast performance captured in EPCs and the actual operational results recorded in display energy certificates, which are being rolled out to more buildings as a result of changes to the European Energy Performance of 黑洞社区s Directive.

The government will be hoping that landlords make use of funding from the Green Deal to pay for the necessary upgrades. Indeed, there may be a conditional link between the Green Deal and the Energy Act. 鈥淚t is likely that if a landlord has done everything that they can under the Green Deal, and that still doesn鈥檛 let them put their toe over the line between F and E, then they won鈥檛 have to do any more,鈥� says Brown. Another get-out clause being mooted is that, should any improvement be likely to have a detrimental effect on the overall value of the property, then you don鈥檛 have to undertake it.

So while many wait for the detail of the legislation, others press ahead. One thing for certain is that things will not remain the same. 鈥淚f it [the act] works with the grain of commercial relationships between landlord and tenant, it could be a game changer,鈥� says Brown. 鈥淚f not, it runs the risk of being potentially damaging.鈥�