EV charging hub planning: substations, noise and grid

A bank of rapid chargers on an existing car park usually needs no planning permission for the chargers themselves. What drives the planning application is everything built around them: the canopy, the totem, the lighting columns and the packaged substation that makes the site work at all. Operators tend to find this out in the wrong order, having already agreed a layout with a landowner. So the honest starting point for ev charging hub planning permission is the substation and the grid connection, not the charge points.

Which works fall inside permitted development

Part 2 of Schedule 2 to the Town and Country Planning (General Permitted Development) (England) Order 2015 carries two classes written for charging equipment. Class D covers a wall-mounted electrical outlet. Class E covers an upstand with an outlet on it, which is what a pedestal or rapid unit normally is.

For an off-street parking area that is not within the curtilage of a dwelling, the Class E rights are drawn tightly. The upstand and its outlet must not exceed 2.7 metres above ground level, it must not sit within 2 metres of a highway, and there must be no more than one upstand for each parking space it serves. The equipment has to be removed as soon as it is no longer needed for charging.

Those rights fall away on listed buildings and within their curtilage, on scheduled monuments and on land designated as a site of archaeological interest. Article 4 directions can remove them too. The class text has been amended more than once, so read the current version on legislation.gov.uk rather than a summary.

Three practical traps follow from the wording. A charger serving two bays from one pedestal is common in the market and does not obviously fit a per-space reading. Canopy-mounted units are not upstands. And the 2 metre highway measurement bites hardest on forecourt sites, where the parking area often runs right up to the back of the footway.

Canopies, totems and lighting columns

A canopy is building operations and needs planning permission. Councils treat it as a structure in its own right, so its height, span, fascia depth and colour all become design matters, and on an edge-of-centre site the visual effect on the street usually matters more than the chargers under it.

Totems are advertisements. Consent comes through the Town and Country Planning (Control of Advertisements) (England) Regulations 2007, which is a separate application with its own tests of amenity and public safety. Illuminated price displays facing a junction attract highway comment, and a totem above the deemed-consent size limits needs express consent.

Lighting columns rarely need permission on their own but they shape the objections. The Institution of Lighting Professionals guidance note on obtrusive light sets environmental zones from E0 to E4 with limits on vertical illuminance at windows and on upward light. A hub on a retail park boundary backing onto housing sits in a different zone from one on a motorway service area, and the specification should say which zone has been assumed. A lighting assessment that names the zone and reports vertical illuminance at the nearest habitable window answers the objection before it is made.

Siting the substation and the switchgear

Most hubs above about six rapid units need a new package substation. Where the distribution network operator installs and owns it, the works often proceed under the permitted development rights that Part 15 of Schedule 2 gives electricity undertakers. Where the site operator builds the housing and hands over only the equipment, that assumption does not hold and the substation goes into the planning application.

Siting is not a drawing exercise. The network operator will want vehicular access for a delivery and recovery vehicle, a clear working area around the doors, and no parking bay that blocks the approach. Add the separation distances the operator specifies from combustible facades and from anything that could be parked against the housing.

On a site in Flood Zone 2 or 3 the transformer plinth level becomes the controlling dimension, because the equipment has to sit above the design flood level with freeboard while the bays around it stay at the existing surface level. A Utilities Assessment that records the connection capacity, the substation footprint and the cable route keeps all of this in one place instead of scattered across emails.

Transformer hum and cooling fans

This is where applications get refused. A distribution transformer produces a steady hum at 100 Hz and its harmonics, and liquid-cooled or forced-air units add fan noise that runs whenever the hub is busy. Rapid chargers have their own cooling fans, and a row of them cycling on a summer evening is audible well beyond the site.

Assessment follows BS 4142:2014+A1:2019. The method compares a rating level against the background sound level, expressed as the LA90 over the relevant period, at the nearest noise-sensitive receptor. A rating level around 10 dB above background is taken as an indication of a significant adverse impact, around 5 dB above as an indication of an adverse impact, and a rating level at or below background suggests a low impact depending on context.

The rating level is not the measured level. Transformer hum is tonal, and BS 4142 applies a character correction for tonality that can add up to 6 dB by the subjective method. Miss that correction and the assessment is wrong by a whole impact category.

The binding case is almost always night-time. Background sound on a suburban car park boundary drops away after midnight while the transformer carries on, so a hub that passes comfortably at 3pm can fail at 3am. Any illustrative arithmetic you see on this needs site measurement behind it before it means anything. A Noise Impact Assessment should state the measurement positions, the survey dates, the acoustic feature corrections applied and the reasoning behind them.

Layout, circulation and accessible bays

Charging bays are longer in use than parking bays, because cables trail and drivers stand at the unit. Kerbs, bollards and cable management all eat into the swept path, and a layout that works on a 2.4 by 4.8 metre bay grid often fails once a van with a rear charge port arrives.

PAS 1899:2022 sets out accessible charge point design, covering bay dimensions, kerb upstands, unit height and the force needed to handle a cable. It is not a planning requirement, but a council that has adopted an inclusive design policy will ask how the scheme measures against it, and a highway authority will ask about pedestrian routes across the charging area.

The Public Charge Point Regulations 2023 sit alongside all this, covering contactless payment, pricing transparency, reliability reporting for rapid points and open data. They are consumer regulations rather than planning controls, so do not cite them as a planning justification. They do affect the layout, since payment terminals and signage need somewhere to go.

Trip generation is the other half. A hub that draws passing traffic off a main road changes turning movements at the access, and a Transport Statement covering access geometry, visibility splays, internal circulation and servicing is usually proportionate for a site of this size.

The grid connection and the programme

Ask the network operator for a budget estimate before the layout is fixed, then a formal connection offer. The gap between the two is where schemes die. Reinforcement of the upstream network can add many months and change the substation footprint, and an offer has an acceptance window that does not wait for a planning decision.

Sequence the two processes deliberately. Apply for the connection early enough that the substation shown on the planning drawings is the one that will actually be delivered, because a substation that grows by a metre in each direction after permission means a section 96A or section 73 application and another consultation round.

Conditions to expect

Councils reach for a standard set on these schemes. Expect a noise condition fixing a rating level at a stated receptor, a lighting condition requiring a scheme in accordance with the relevant ILP environmental zone, a curfew on any car wash or vacuum plant, and a construction management condition covering wheel washing and delivery hours.

Two are worth negotiating before the decision rather than after. A condition worded as an absolute noise limit at a boundary is harder to demonstrate compliance against than one worded as a rating level at a named receptor assessed under BS 4142. And a lighting condition that requires all luminaires to be extinguished outside opening hours is unworkable on a hub that trades 24 hours, so say so during the application.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. A Lawful Development Certificate under section 192 of the Town and Country Planning Act 1990 is the only formal way to confirm that works are lawful without permission. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.

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