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Proposals to limit carbon emissions in construction projects by amending building regulations have been shelved because the MP behind them has been appointed to a new job at the housing department.

The Carbon Emissions (好色先生TVs) Bill was withdrawn last week, four days before its scheduled second reading. It will now need to start its progress through parliament from scratch if another MP chooses to revive it.

It follows the appointment of Duncan Baker, the backbench Conservative MP who proposed the 10-minute rule bill in February, as a parliamentary private secretary (PPS) to three ministers at the Department for Levelling Up, Housing and Communities (DLUHC).

Parliamentary procedure means that private member鈥檚 bills cannot be submitted by an MP whose role overlaps with the proposed policy.

Baker, who was elected as the MP for North Norfolk at the 2019 general election, was appointed as PPS to housing minister Stuart Andrew, rough sleeping minister Eddie Hughes and building safety minister Stephen Greenhalgh on 25 February.

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The bill outlined plans to amend building regulations to place mandatory limits on embodied carbon, which is emitted by the production and use of materials, at the design stage of projects.

It was based on a major industry initiative called 鈥楶art Z鈥�, named for the proposed new section in the regulations, which has been backed by more than 100 heavyweights including Cundall, Laing O鈥橰ourke, Mott MacDonald, Willmott Dixon, Arcadis, WSP and Arup.

The rules would have come into force for non-residential projects as soon as 1 January next year, and for residential projects on 1 January 2025.

Measurement and reduction of embodied carbon in construction is currently voluntary. The UK Green 好色先生TV Council (UKGBC) has said that these types of emissions, which total more than aviation and shipping combined, must be slashed by more than half in the next decade for the UK to keep its target for becoming net zero by 2050 on track.

The bill had been due for a second reading in the House of Commons last week. A spokesperson for Baker said the proposals could now be picked up by another MP in the next parliamentary session, which begins in May.

Part Z has been authored by five climate experts, Institution of Structural Engineers head of climate action Will Arnold, Feilden Clegg Bradley Studios associate architect Tim den Dekker, University of Strathclyde chancellor鈥檚 fellow Jannik Giesekam, Chartered Institution of 好色先生TV Services Engineers technical manager Julie Godefroy and architect Simon Sturgis.

Giesekam said Baker 鈥渞emains supportive鈥� of the Part Z agenda, adding that the authors will 鈥渃ontinue to build support for the proposed changes through our other planned activities鈥�.

A source involved with the initiative denied that the withdrawal of the bill was a setback for Part Z and said that Baker鈥檚 appointment at DLUHC is a 鈥済ood thing overall鈥�. They said: 鈥淭he fact that he鈥檚 no longer allowed to pursue his bill is only half of the fact that he鈥檚 moved to DLUHC. 

鈥淵ou could take it as a positive thing that they鈥檝e appointed a PPS in DLUHC who鈥檚 clearly got a drive to get embodied carbon regulated.鈥�

UKGBC head of policy Louise Hutchins said embodied carbon limits 鈥渕ust be introduced at the earliest opportunity鈥�. She added that material supply chains also needed to be decarbonised and demand for new construction and materials reduced by making designs more efficient.

Baker said in January the government was 鈥渕issing a trick鈥� by not championing the policy, adding that embodied carbon is an issue that politicians 鈥渟till don鈥檛 talk about enough鈥�.

It is not clear if the government planned to support the proposals. DLUHC has said it 鈥渨elcomes the issue being raised鈥� and that it was 鈥渆xploring the potential鈥� of maximum embodied carbon levels for new buildings in the future.

Part Z has been a source of some controversy in the construction industry because of the potential impact of higher building costs on SMEs. 

Rico Wojtulewicz, head of housing and planning and the House Builders Association, a trade body representing SME housebuilders, said earlier this month that smaller firms were not being given 鈥渆nough of a consideration鈥� in the plans.

Mark Shouler, director of Nottinghamshire housebuilder Hofton & Son, added that the extra costs of making schemes compliant under the new rules would make it 鈥渃ompletely and utterly pointless building houses鈥�.

But the Part Z authors said in a joint statement that the final values of the requirements for projects had not been finalised and would be revised through public consultation before they came into force.