Planning and Infrastructure Bill (Fourteenth sitting)

Ellie Chowns Excerpts

Thursday 22nd May 2025 Public Bill Committees

Brought up, and read the First time.

[Ellie Chowns (North Herefordshire) (Green)]

I beg to move, That the clause be read a Second time.

[The Chair]

With this it will be convenient to discuss the following:

New clause 78—Cooling hierarchy guidance—

“The Secretary of State must, within six months of the passing of this Act, issue guidance for local planning authorities which—

(a) outlines a cooling hierarchy; and

(b) provides guidance on the application of the cooling hierarchy in the exercise of a local planning authority’s planning and development functions.”

This new clause would require the Secretary of State to publish guidance for local planning authorities on applying the "cooling hierarchy"—a structured approach to reducing overheating risk in buildings, prioritising passive and sustainable design measures.

New clause 79—Overheating risk assessments—

“(1) The Secretary of State must, within six months of the passing of this Act, require all applications for planning permission for residential development to include an overheating risk assessment.

(2) An overheating risk assessment must be conducted in accordance with—

(a) the Chartered Institution of Building Services Engineers’ design methodology for the assessment of overheating risk in homes, or

(b) any successor standard designated by the Secretary of State.”

This new clause would require all planning applications for residential development to include an overheating risk assessment, conducted in line with the latest recognised technical standard, such as those of the Chartered Institution of Building Services Engineers (CIBSE).

New clause 80—Incorporation of features to mitigate overheating risk—

“(1) When preparing any plan or strategy relating to the development of housing under the Planning and Compulsory Purchase Act 2004, a local planning authority must have regard to the need for residential developments to incorporate passive design features that mitigate the risk of overheating.

(2) Passive design features may include—

(a) cross-ventilation,

(b) external shading,

(c) solar control glazing, and

(d) thermal mass.”

This new clause would require local planning authorities, when preparing housing-related plans or strategies, to have regard to the need for residential developments to include passive design features that reduce the risk of overheating, such as cross-ventilation, external shading, solar control glazing, and thermal mass.

New clause 81—Access to data on overheating risk—

“(1) For the purposes of supporting the making of local plans, spatial development strategies and planning decisions, the Secretary of State must make provision for local planning authorities to have access to relevant data relating to overheating risk.

(2) The Secretary of State must ensure that data on overheating risk made available to local planning authorities is updated at intervals not exceeding five years.”

This new clause would require the Secretary of State to ensure that local planning authorities have access to up-to-date data on overheating risk, to support the making of local plans, spatial development strategies, and planning decisions.

[Ellie Chowns]

It is a pleasure to serve under your chairship once more, Mrs Hobhouse. I rise to speak in strong support of a group of new clauses that address a clear and growing risk to public health, quality of life and economic productivity: domestic overheating. It may surprise some—hopefully no one in this room—to know that the risk of overheating in homes is now one of the most severe climate-related threats in the UK. The Climate Change Committee’s independent climate risk assessment identifies overheating in homes as one of the most severe climate risks, requiring urgent action. Over half of UK homes are already at risk of overheating, and that is projected to increase to 90% homes under a 2°C global warming scenario, which unfortunately is a possibility.

This is not some distant hypothetical; the Met Office recorded the UK’s first ever 40°C day in 2022. Already around 2,000 deaths per year in England are attributed to heat waves, a number that is projected to more than triple by the 2050s under even a medium-emissions scenario. This is not just a health issue but an economic one. Evidence shows that overheating in buildings could cost the UK economy £60 billion a year—the equivalent of 1.5% to 2% of GDP—through lost productivity. That is on top of the economic costs of heat-related mortality, estimated to already be £6.4 billion per year in England, which is likely to increase to £14.7 billion per year by the 2050s. These are huge figures.

As highlighted by the Climate Change Committee,

“early adaptation investments deliver high value for money”,

with every £1 invested in adaptation delivering £10 in net economic benefits. That is a huge rate of return and a huge benefit-cost ratio. As heard by the Environmental Audit Committee, passive measures supported through planning, such as installing external shutters, can reduce incidence of heat mortality by around 40%.

Given the urgency, I draw the Committee’s attention to a regrettable decision made more than a decade ago. In 2012, the coalition Government removed references to “overheating” from the national planning policy framework. This left a significant gap in our planning system’s ability to deal with overheating risks—one that has not been adequately addressed since. That is precisely why we need the new clauses. There are five in the group, each of which deals with a particular element that needs addressing, and I will go through them now.

New clause 77 would empower local authorities to impose conditions on planning permissions where there is demonstrable overheating risk, such as single-aspect flatted developments with no cross-ventilation. It is a targeted, proportionate provision that would allow planning authorities to respond to local climatic data with appropriate preventive conditions, and it would undo the short-sighted change introduced by the previous Government.

New clause 78 would introduce statutory guidance on the cooling hierarchy, an approach that is already familiar in London planning policy. The hierarchy prioritises passive design strategies, such as shading and ventilation, before resorting to energy-intensive cooling. This aligns with our net zero goals and ensures resilience, without placing undue burden on developers and the grid. Why would we not ensure that our buildings can effectively cool themselves before going to measures such as installing air conditioning?

New clause 79 would address a significant gap by requiring all full planning applications for residential developments to include an overheating risk assessment, using the established TM59 standard, or its successor, from the Chartered Institution of Building Services Engineers. At present, many new homes are being designed with large, south-facing windows, poor ventilation and inadequate shading. Building regulations alone do not capture this risk at the early design stage, so the planning system must intervene. Overheating is a planning issue, not just a building regulations issue. Building regulations govern how buildings are constructed; planning dictates what gets built and where.

[Rachel Taylor (North Warwickshire and Bedworth) (Lab)]

It is a long-standing norm that building regulations deal not just with the construction of buildings but their thermal efficiency and performance. That is why energy performance certificates were introduced, and there are regulations on windows, glazing and glass roofs all found within the building regulations. Surely these provisions on overheating need to go hand in hand with those provisions on thermal efficiency in housing, and therefore sit far better within building regulations than in this Bill.

[Ellie Chowns]

I do not at all dispute that there is potential to go further and faster within the framework of building regulations to address the risks that I am outlining. However, there is also potential within the planning framework to do it, which is exactly the point that I have made. The removal of “overheating” from the planning framework in 2022 meant that things have got worse. We have an opportunity in the Bill to ensure that we tackle overheating through the planning framework, as well as the building regulations framework. It really is not an either/or. There is scope and need within both those frameworks to address the risks that I am outlining.

New clause 80 would ensure that local plans must consider passive design in residential development, from cross-ventilation to thermal mass. These are well-established strategies that can drastically reduce indoor temperatures during extreme heat events without energy use.

Finally, new clause 81 would ensure that local authorities have access to up-to-date, localised overheating risk data. Evidence-based planning is possible only when planners are equipped with timely, spatially accurate information. Datasets such as these have already been pioneered in places like Bristol, with its Keep Bristol Cool map and local plan policies. Likewise, the Department for Environment Food and Rural Affairs has been developing national data on overheating, and that could form the basis of rolling out such support nationally.

We really must not miss this opportunity. Climate adaptation cannot be an afterthought; it needs to be embedded in our planning framework and how we plan our communities, protect our citizens and shape the homes of tomorrow. These five new clauses offer a clear, practical and urgently needed framework to ensure that our planning system is fit for a warmer world. I urge the Committee to support them.

[The Minister for Housing and Planning (Matthew Pennycook)]

It is a pleasure to continue our proceedings with you in the Chair, Mrs Hobhouse. I thank the hon. Member for North Herefordshire for tabling the new clauses and raising the very real social and economic issue of overheating in our homes. I absolutely agree with her aims to ensure that homes being built do not give rise to the health and lifestyle risks that come with overheating.

In 2021, a new part of the building regulations—part O —was introduced, which was designed specifically to ensure that new homes are built to mitigate the risk of overheating. As the hon. Lady will know, compliance with building regulations is mandatory. Given the transitional arrangements that accompany new building regulations, it is only relatively recently that we have seen new homes built specifically to mitigate the risk of overheating, so we are seeing that effect come through the planning system. As part of the future homes and buildings standards consultation, which ran from December 2023 to March 2024, my Department ran a call for evidence on part O. This was to investigate how industry was finding part O, how it was being implemented and whether further improvements could be made. The Government response to that call for evidence, with details of next steps, will be issued later this year.

Different regulatory regimes exist for different purposes, and aspects of building construction concerned with heating and cooling are best addressed through these regulations. The planning system absolutely has a role in mitigating the risks of overheating, but in the Government’s view, that is more in the overall layout and form of development—matters that are covered in national planning policy. Notwithstanding the comments that the hon. Lady made about changes introduced by the coalition Government, paragraph 161 of the national planning policy framework sets out that concern must be given to

“taking into account the long-term implications”

of a range of matters, including overheating.

I reassure the hon. Lady that there is specific reference to overheating in the NPPF as it stands. As we have discussed several times, the framework was partially revised in December last year, but we have again committed to consult on clearer policies for development purposes, which is how decisions on applications are made. These will cover the full range of planning considerations, including how the planning system can address the risks posed by climate change. This is a really important topic, but we think that we are addressing it through our work to strengthen building regulations and planning policy in the future. On that basis, I hope that the hon. Lady is somewhat reassured and will withdraw the motion.

[Ellie Chowns]

I am somewhat reassured that the Minister recognises the severity of the problem. None the less, I maintain that there is need and scope to go further in ensuring that the planning system specifically enables us to address this issue. In the interests of gently encouraging the Minister further in the direction of tackling overheating, I will press this new clause to a vote.

Question put, That the clause be read a Second time.

--- Later in debate ---

[Olly Glover]

I thank the Minister for his comments. I was very pleased to hear him reference Active Travel England; as one of the vice-chairs of the all-party parliamentary group for cycling and walking, I have been very impressed by the leadership of Chris Boardman, and it is good to hear the Minister making encouraging noises in that direction. I beg to ask leave to withdraw the motion.

Clause, by leave, withdrawn.

New Clause 91

Embodied carbon assessments

“(1) Local planning authorities must, within 12 months of the passing of this Act—

(a) require applications for permission for developments which exceed a specified gross internal area and number of dwellings to include an embodied carbon assessment;

(b) consider a relevant embodied carbon assessment as a material factor when considering whether to grant permission for the development.

(2) The Secretary of State must—

(a) approve a methodology for calculating embodied carbon emissions;

(b) provide guidance on how the whole-life carbon emissions of buildings must be expressed; and

(c) establish a centralised reporting platform to which embodied carbon and whole life carbon assessments must be submitted.

(3) For the purposes of this section—

‘embodied carbon’ means the total emissions associated with materials and construction processes involved in the full life cycle of a project;

‘whole life carbon’ means the combination of embodied and operational emissions across the full life cycle of a project;

‘operational emissions’ means the carbon emissions from the energy used once a project is operational, including from heating, lighting and cooling.”—(Ellie Chowns.)

This new clause would require the submission of embodied carbon assessments for larger developments as part of the planning application and consideration of these by local planning authorities. The Secretary of State will be required to approve a methodology, issue guidance, and establish a centralised reporting platform for whole-life carbon emissions.

Brought up, and read the First time.

[Ellie Chowns]

I beg to move, That the clause be read a Second time.

[The Chair]

With this it will be convenient to discuss new clause 108—Repeal of section 14A of the Land Compensation Act 1961—

“In the Land Compensation Act 1961, omit section 14A.”

[Ellie Chowns]

New clause 91 would require the submission of embodied carbon assessments for larger developments as part of the planning process. It is a practical, forward-looking measure that I think will make a significant difference. It has been called for widely by industry, and indeed by parliamentarians, for some years, and it relates to a critical and currently unregulated area of the UK’s built environment emissions. The new clause would require planning applications for development only over a certain size to include an embodied carbon assessment, and it would provide for the Secretary of State to approve a methodology, issue guidance on how the assessments should be carried out, and establish a centralised reporting platform. Crucially, it would require that local planning authorities consider these assessments as a material factor when reviewing an application.

Embodied carbon refers to the emissions associated with materials and construction processes throughout the whole life cycle of a building or of infrastructure. This is typically from any processes, materials or products used to construct, maintain, repair, refurbish or repurpose a building. The UK Green Building Council estimates that the UK releases around 60 million tonnes of embodied carbon per year. That is more than aviation and shipping combined, and it accounts for over 10% of UK emissions. This is really significant. As I mentioned on a previous day, as we become more efficient in the operational carbon in our buildings, the embodied carbon in them becomes an increasingly significant part of the carbon reduction challenge in the building sector.

Embodied carbon has not substantially reduced over the last 30 years, unlike operational carbon, despite initiatives to decarbonise material manufacturing. Unlike operational carbon, which can be regulated through building performance standards, embodied carbon remains unaddressed by policy. As a result, decisions with very significant long-term climate implications are being made every day without a consistent framework for assessing their carbon impact. It is a huge unregulated problem.

The new clause seeks to close that gap in a measured and industry-ready way. It would not impose a burden on small-scale development—only major schemes, where carbon savings from early design choices are both most impactful and most achievable. It would buils on existing tools and industry momentum, and industry actually really wants this. There are already widely used standards and guidance available, including the whole life carbon assessment guidance from the Royal Institution of Chartered Surveyors, the UK net zero carbon buildings standard and the embodied carbon primer from the London Energy Transformation Initiative.

Many local authorities, such as the Greater London Authority, Bristol and Manchester, have begun requiring whole life carbon assessment as part of planning. Embedding this requirement in the Planning and Infrastructure Bill would provide clarity and consistency, saving time and minimising potential legal challenge by ensuring that planning authorities are demonstrably committing to the fulfilment of statutory climate duties. It would empower local planning authorities to make more informed, balanced decisions that take account of our legally binding net zero commitments and provide a consistent policy environment in which developers can operate.

This next bit is really important: there is strong consensus from industry that there is a need for this requirement to be widespread. Over 140 organisations have signed up to Part Z, a proposal developed by industry that calls for embodied carbon regulation. The industry is ahead of the politicians on this, and they are calling for it. This new clause requires a central database and consistent measurement framework to streamline and simplify the current diversity of approaches. Standardisation of embodied carbon measurement is a major priority, with leading industry organisations—such as UKGBC, the Royal Institute of British Architects, CIBSE, the Institution of Structural Engineers and RICS—calling for a national framework to ensure consistency between planning authorities.

Importantly—this is my final paragraph—this new clause aligns with the Bill’s aim to accelerate the delivery of housing and infrastructure while ensuring that the system is fit for future needs. The decisions that we make today about what we build and how we build it will lock in emissions for decades. This new clause is not a barrier to development: it is a tool to build better, more responsibly, more efficiently and more sustainably. It enables early intervention, supports innovation and ensures that the carbon cost of our buildings is not ignored in the rush to meet targets. It is pragmatic, proportionate and backed by industry. If the Minister is not inclined to accept the new clause, I would very much welcome a meeting with him to discuss how we can ensure that embodied carbon is taken forward and we use Government policy to address this important issue.

[Matthew Pennycook]

I thank the hon. Lady for tabling this new clause, and I very much recognise the challenge that she has outlined. The Government are committed to the 2050 net zero carbon emissions target, and we recognise that embodied carbon can account for a significant proportion of a building’s whole life carbon emissions. Climate change is obviously one of the greatest challenges facing the world today, and managing carbon emissions and carbon storage is vital to mitigating the speed and impact of climate change. The national planning policy framework is clear that the planning system should contribute to and support the transition to a low-carbon future. Plans should take a proactive approach to mitigating and adapting to climate change, taking into account the long-term implications, in line with the objectives and provisions of the Climate Change Act 2008.

Our consultation in the summer of last year on changes to the NPPF deliberately sought views on whether carbon can be accurately measured and accounted for in plan-making and planning decisions to establish industry readiness and identify any challenges to widespread use of carbon assessments in planning. We received a wide range of views on this topic, and based on the responses received, we do not consider it appropriate to make carbon assessments a mandatory requirement using a standardised methodology at this stage. However, we consider that both local authorities and developers could benefit from clearer guidance on the use of appropriate tools to assist in reducing the use of embodied carbon and operational carbon in the built environment, and we have committed to updating the relevant planning policy guidance to support this.

Addressing embodied carbon is a challenge across the built environment and construction supply chains, not just in buildings. As other policies take effect, and industries that supply construction decarbonise, the embodied carbon emissions of buildings will fall in turn. I am happy to give the matter further thought, and I am more than happy to have the hon. Member for North Herefordshire take one of my Tea Room surgery appointment slots.

[Ellie Chowns]

I thank the Minister, and look forward to discussing this with him further. I beg to ask leave to withdraw the motion.

Clause, by leave, withdrawn.

New Clause 94

Considerations when deciding an application for development consent

“In section 55 of the Planning Act 2008 (acceptance of applications), after subsection (4) insert—

‘(4A) When deciding whether to accept an application, the Secretary of State must have regard to the extent to which consultation with affected communities has—

(a) identified and resolved issues at the earliest opportunity;

(b) enabled interested parties to understand and influence the proposed project, provided feedback on potential options, and encouraged the community to help shape the proposal to maximise local benefits and minimise any disbenefits;

(c) enabled applicants to obtain relevant information about the economic, social, community and environmental effects of the project; and

(d) enabled appropriate mitigation measures to be identified, considered and, if appropriate, embedded into the proposed application before the application was submitted.’”—(Gideon Amos.)

This amendment to the Planning Act 2008 would require the Secretary of State to consider the content and adequacy of consultation undertaken with affected communities when deciding an application for development consent.

Brought up, and read the First time.

[Gideon Amos (Taunton and Wellington) (LD)]

I beg to move, That the clause be read a Second time.

I will be brief, Mrs Hobhouse. Earlier in the progression of the Bill, we debated the removal of the pre-application requirement—all the statutory requirements for pre-application consultation under the Planning Act 2008. It may be wishful thinking, but it seemed to me that it was a generally held view that a qualitative test of some sort was needed for the consultation carried out by applicants before a DCO NSIP application is accepted for examination. That is certainly the opinion among the Liberal Democrats.

We therefore drafted the new clause, which repeats the four key paragraphs on the requirements for good consultations, which are in Government guidance, and places them on the face of the Bill as something to which the Secretary of State should have regard when considering whether to accept an application for development. In other words, in simple terms, when an application comes in, the Secretary of State and the inspector should consider the extent to which the applicant has consulted people and how well they have consulted people. That seems to be a basic, straightforward and simple requirement. I am sure the Government will have many complicated reasons for why this cannot be done, but to my mind it seems a straightforward way of dealing with it: introducing a qualitative test for Government to apply, given that they are removing all the pre-application consultation requirements from the primary legislation.

I have a quotation from Suffolk county council. As many will know, Suffolk has had more than its fair share of nationally significant infrastructure projects, far more than anywhere else in the country, starting with the Ipswich rail chord a number of years ago, with which I had some involvement. Suffolk is the site of numerous offshore wind farms, solar farms, Sizewell and huge numbers of cable routes and substations so, as the council describes it:

“Suffolk County Council has been involved with the delivery of projects under the Planning Act…since 2010”.

It states:

“The proposed replacement of a statutory requirement, by statutory guidance alone, is therefore, neither sufficient nor robust.”

I will not continue the quotation in the interests of time. I am sure that the Committee gets the gist. We offer the new clause as a way of securing sensible test, so that there is proper pre-application consultation, and that that continues to occur despite the removal of all the requirements under the Act.