Net zero targets in local plans and how they are secured

A local plan can require better energy performance than the building regulations, because section 1 of the Planning and Energy Act 2008 lets a plan include policies imposing reasonable requirements for energy efficiency standards that exceed the national ones. What a plan cannot easily do is require them in a metric of its own invention, secure them through a condition that fails the six tests, or carry them through examination without plan-wide viability evidence.

That gap between what a policy says and what it can actually deliver is where most of the argument happens on a live application.

How carbon targets appear in adopted policy

Three drafting patterns dominate. The first expresses a percentage improvement on the Target Emissions Rate set by the building regulations, which keeps the policy in the same metric the compliance calculation already uses. The second sets an absolute energy use intensity figure in kWh per square metre per year alongside a space heating demand limit, which is how the more ambitious plans have gone. The third asks for net zero carbon in operation, with a cash contribution for any shortfall.

The first is the most straightforward to enforce, because the evidence is a SAP or SBEM output the applicant has to produce anyway. The second is more demanding but tells you something the regulated calculation does not, since energy use intensity is measured rather than modelled. The third depends entirely on whether the plan has set the offset rate and the mechanism, and a net zero policy with no rate behind it is close to unenforceable.

In London the pattern is set by the London Plan, whose energy policy requires a minimum improvement on Part L for major development, a be lean, be clean, be green, be seen sequence, and whole life-cycle carbon assessment for referable schemes. Boroughs then layer their own targets on top, so check both.

The limits on what a plan can require

Government has repeatedly discouraged local energy standards expressed in metrics that diverge from the building regulations, most recently through a written ministerial statement on local energy efficiency standards which asked authorities to express any local requirement as a percentage uplift on the Target Emissions Rate. A written ministerial statement is not legislation and does not override the Planning and Energy Act, but it is a material consideration and inspectors treat it as one at examination and on appeal.

So a policy that survives is usually one that:

• expresses the requirement in the same metric as the compliance calculation
• explains why the uplift is needed in that area
• is supported by plan-wide viability evidence
• offers a defined route for the residual, whether offset payment or agreed exception

The Future Homes Standard changes this ground, and the timing of its introduction and the level it lands at should be checked against the current position rather than assumed, because plan policies drafted against an earlier assumption may be overtaken.

Securing a target once permission is granted

Two instruments, and they do different jobs.

A planning condition has to meet the six tests in the Planning Practice Guidance: necessary, relevant to planning, relevant to the development permitted, enforceable, precise, and reasonable in all other respects. Conditions work well for an energy strategy submitted before work starts, for as-built evidence before occupation, and for a post-occupation monitoring requirement. They work badly where money has to change hands.

A section 106 obligation is needed for the payment. It has to satisfy the tests in regulation 122 of the Community Infrastructure Levy Regulations 2010: necessary to make the development acceptable in planning terms, directly related to the development, and fairly and reasonably related in scale and kind. A carbon offset contribution calculated against a published rate in adopted policy clears those tests comfortably. One invented at the point of decision does not.

The commonest drafting failure is a condition requiring compliance with a policy rather than with a number. Put the figure in the condition.

Building regulations, and where the overlap bites

The uplift to Part L in 2021 raised the required carbon reduction for new dwellings against the previous edition, and it also brought in the requirement to produce as-built compliance evidence. Planning and building control remain separate consents with separate enforcement, and a planning condition requiring a standard above the regulations is enforced by the authority's planning enforcement team rather than by building control.

Applicants sometimes argue that the matter is controlled by other legislation and therefore that a condition is unnecessary. That argument works where the planning requirement and the regulatory requirement are identical. It does not work where the plan requires more, which is the whole point of the Planning and Energy Act power.

Viability arguments against a target

The Framework's approach puts the weight of viability testing at plan-making stage, so where a policy requirement was tested across the plan area, a site-specific argument that it cannot be afforded is the exception rather than the norm and the applicant carries the burden.

What a credible argument looks like: benchmark land value justified on existing use value plus a premium, with the carbon cost isolated as a separate line rather than buried in a total abnormals figure. What it usually looks like instead: a residual appraisal where the carbon cost appears alongside affordable housing and section 106 as a single undifferentiated squeeze. Ask for the carbon line separately, every time.

Where the argument succeeds, the fallback should still be secured. A reduced target, monitored and verified, is worth more than a target abandoned.

Emerging policy and the weight it carries

Weight for an emerging plan turns on the stage the plan has reached, the extent of unresolved objections to the relevant policy, and how far the policy is consistent with national policy. A carbon policy at regulation 19 stage with no objections from the housebuilding industry carries real weight. The same policy at regulation 18 with a dozen objections carries very little, whatever the officer report says.

Cite the current National Planning Policy Framework edition when you make that argument, and note that the Framework was re-issued in August 2026 with policy-coded chapters in place of paragraph numbers, so a citation copied from an older document will not match the reader's copy.

Drafting an energy statement against a target

Start from the policy wording, quote it, and answer it clause by clause. An Energy Statement that reports a SAP output without mapping it to the adopted requirement leaves the officer to do the comparison, and officers under pressure refuse rather than calculate.

Where the plan requires embodied carbon as well as operational carbon, a Whole Life Carbon Assessment is a separate exercise with its own scope rules, and the two documents should share assumptions rather than contradict each other. Fuel choice is worth resolving early too, since the decision on a gas connection drives the whole compliance route. On larger schemes the carbon in roads, drainage and structures is often larger than anyone budgeted for, which is the point of looking at carbon in the infrastructure a scheme has to build.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.

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