Post-occupancy energy reporting conditions explained

Post-occupancy energy monitoring conditions ask you to measure what a building actually uses once people are in it, and to report those numbers to the authority for a set period after occupation. In London this is the Be Seen stage of the energy hierarchy under the London Plan, with reporting at as-built stage and annually in use. Outside London the practice is patchier but spreading, usually through a condition on major schemes. The obligation is easy to accept at committee and hard to discharge five years later, and the reason is almost always that nobody designed the metering to produce the data the condition asks for.

Why these conditions appeared

Regulated energy calculated at design stage under SAP or SBEM is a compliance number, not a prediction. It excludes most unregulated loads, assumes standard occupancy patterns, and says nothing about whether the plant was commissioned properly.

Authorities noticed that carbon savings promised in an energy statement were never tested against anything. Where an applicant claimed a percentage improvement over Part L, that claim vanished at handover. Monitoring conditions close the loop by requiring measured data, and the Greater London Authority formalised the approach by adding Be Seen to Be Lean, Be Clean and Be Green.

The policy intent is transparency rather than punishment. The data goes into a portal so that predicted and actual performance can be compared across schemes, which over time gives planners an evidence base they have never had.

What the condition usually asks for

Read the wording closely, because the metric decides the metering.

The common reporting set covers total energy use intensity in kWh per square metre of gross internal area per year, split between regulated and unregulated loads, on-site renewable generation in kWh, and where relevant the heat supplied by a network. Some conditions also ask for water consumption and for the as-built energy modelling to be submitted alongside the measured data.

Reporting periods vary. An as-built submission before first occupation plus annual submissions for five years is the pattern most often seen on referable London schemes. Shorter periods appear on smaller developments.

The detail that catches people out is the denominator. Energy use intensity per square metre requires an agreed floor area definition, and gross internal area measured to a recognised standard will differ from the figure on the application form. Agree it in writing at the discharge of conditions stage rather than in year three.

Metering strategy at design stage

This is where compliance is won or lost. A building that cannot separate landlord services from tenant consumption cannot report the split, and retrofitting sub-metering into an occupied building is disruptive and expensive.

1. List every end use the condition will require separately, then map one meter to each.
2. Sub-meter landlord and tenant supplies separately, and separate common areas, lifts, ventilation, heating plant and any commercial units.
3. Meter renewable generation and export, not just import.
4. Specify automatic meter reading with half-hourly data and a single point where the data can be collected, rather than a technician walking the risers.
5. Fix responsibility for the data platform in the building contract, with a handover of credentials.
6. Commission the metering as a named activity, because uncommissioned metering that reads zero is the commonest reason a first report fails.

Approved Document L already requires sub-metering in larger buildings, so much of this is happening anyway. The planning condition simply makes someone accountable for the output.

Who holds the obligation after the site is sold

A condition runs with the land, so the obligation passes to whoever owns and occupies the building. On a build to rent scheme that is straightforward. On a for-sale residential block it is not, because the developer who gave the commitment has gone and the residents' management company has inherited a reporting duty it never agreed to.

Deal with this at drafting. Where the reporting sits in a section 106 obligation rather than a condition, the deed can name the party responsible and require the obligation to be passed on in the transfer. Where it sits in a condition, write the duty into the management company's terms and hand over the metering documentation with the building manual.

Tenant data brings its own problem. A landlord cannot always compel a commercial tenant to release consumption data, so put the obligation in the lease at the outset. Where the lease is silent, the report will contain estimates and the authority will ask why.

Comparing predicted with actual

The gap between the two is the point of the exercise, and a report that shows a gap is not a breach. Conditions of this kind require reporting, not a guaranteed outcome.

Expect the measured figure to exceed the modelled one. Unregulated loads, small power, lifts, commercial kitchens and server rooms sit outside Part L modelling entirely. Occupancy patterns differ from the standard assumptions. Controls get overridden in the first winter.

What the authority will look for is whether the numbers were collected properly and whether anything is being done about outliers. Where performance falls well short, a sensible response is a written investigation covering commissioning records, control settings, metering errors and occupancy, with a short list of corrective measures. That is a better answer than restating the design figures.

Where the scheme also carries a Whole Life Carbon Assessment, keep the two evidence bases consistent, because operational energy is a module within that assessment and a divergence between the two documents is noticeable.

Drafting a condition you can comply with

Push back at the committee stage, politely and in writing, on any of the following.

A condition that names a reporting platform without saying what happens if that platform changes. One that requires reporting "for the lifetime of the development", which fails the precision and reasonableness tests in the Planning Practice Guidance. One that ties reporting to a target rather than to submission of data, because the authority cannot enforce an outcome it has no power to require. One that omits who reports, leaving an unidentified successor holding the duty.

Offer replacement wording. A condition specifying the metrics, the floor area basis, the reporting frequency, the number of years and the responsible party is easier for the authority to enforce and easier for you to satisfy.

The upstream document matters too. An Energy Statement that already sets out the metering strategy, the reporting metrics and the responsible party gives the officer a condition to copy rather than one to invent. On phased schemes the same applies to the energy masterplan for the site as a whole, where reporting boundaries between phases need to be settled before the first plot is occupied. And on all-electric schemes the decision recorded in the gas connection assessment shapes what the metering will be counting.

Browse all 66 PlanScope report types and start a draft if you want the energy and sustainability documents assembled before the condition is written for you.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.