Town centre health checks and what they have to show

A town centre health check is the baseline evidence that tells a decision maker how a centre is performing before your proposal arrives. It matters because the impact test in national policy asks about the effect on the vitality and viability of a centre, and you cannot measure an effect without a starting point. Most health checks that fail do so for the same reason: they describe the centre in adjectives rather than in indicators, and they do not say when the data was collected. Planning Practice Guidance sets out the indicators expected, and the authority's own retail study is usually where they already exist.

What the health check is for

Two separate policy tests draw on it. The sequential test asks whether a main town centre use could be located in a centre before an edge or out of centre site is considered, and the impact test asks about the effect on existing, committed and planned investment in a centre and on the centre's vitality and viability.

The impact test is where the health check does its work. National policy directs refusal where an application is likely to have a significant adverse impact on either limb, which means the argument is about degree. A centre with high occupancy, rising rents and strong footfall can absorb trade diversion that would damage a fragile centre with long term voids.

So the health check is not a background chapter. It is the measuring instrument, and its quality decides how much weight the impact conclusion carries.

The indicators, and where the data comes from

Planning Practice Guidance lists the indicators for assessing the health of a centre. The ones that get used in practice, and the usual source for each, are these.

Two of these carry more weight than the rest in most cases. Vacancy, because it is objective and repeatable, and pedestrian flow, because it is the closest proxy for trade. Both are also the easiest to present misleadingly, which is why the methodology paragraph matters as much as the number.

Vacancy should be given as a count of units and as a proportion of ground floor frontage, with the survey date and the definition used. A unit in active refurbishment, a unit occupied by a short term operator and a unit boarded for three years are all vacant on one definition and not on another. Say which you used. The article on vacant premises and reoccupation covers how the planning position on individual voids works.

Start with the authority's own retail study

Most authorities commission a retail and leisure study to support the plan, refresh it every few years, and publish it in the evidence base. It normally contains a household survey defining catchment zones and market shares, a frontage survey of each centre, and a health check summary for the centres in the hierarchy.

Use it as the starting point for three reasons. It is the authority's own evidence, so it is difficult for the authority to disown. It gives you a comparison point from an earlier survey, which turns a single figure into a trend. And it tells you the zone structure and market share assumptions the council's consultant will use when they check your impact work.

Check its date. A study whose household survey predates a significant change in the centre, a large opening or closure, a road scheme, will be challenged, and the honest course is to say so and update the parts that have moved.

Primary survey work, and when it earns its cost

Commission your own survey where the authority's evidence is out of date, where your catchment crosses into a neighbouring authority whose study uses different zones, or where the decisive indicator is one the study does not cover.

A frontage survey costs little and should always be refreshed. Walk the centre, record every ground floor unit by address, use class and operator, note vacancies and any evidence of imminent change, and photograph the frontages. Do it on a normal trading day.

Footfall counts need more care. Fix the count points and keep them for any repeat survey, count for the same periods across the day, cover a midweek day and a Saturday, avoid school holidays and the weeks around Christmas and Easter, and record the weather. Report the raw counts alongside any adjustment, because an inspector will want to see what was actually observed.

Household surveys are the expensive item and are rarely worth commissioning for a single application unless the scheme is large enough that market share assumptions decide the outcome.

Attributing change to a proposal

This is the part that separates a competent retail impact assessment from a weak one. The health check tells you the condition of the centre. The impact test asks what your proposal will do to it, and that requires a chain of reasoning rather than an assertion.

The conventional method runs as follows.

1. Define the catchment in zones, usually taking the zone structure from the authority's household survey.
2. Estimate the turnover of the proposal from floorspace and a sales density, stating the source of the density.
3. Apportion that turnover across zones using market share evidence.
4. Identify where the trade is drawn from, zone by zone, and how much of it comes from the centre in question.
5. Express the diversion as a proportion of the centre's turnover, and consider it alongside any other committed schemes.

Every step has an assumption in it, and each one should be stated in the text rather than buried in an appendix. The single most common weakness is a sales density with no source, because it drives the whole calculation.

Baseline drift matters too. Centres change for reasons unconnected to your application, and a health check that attributes existing decline to a hypothetical future scheme has confused the question. Where the centre is already losing comparison floorspace, say so, and say what would happen with and without the proposal.

Presenting the baseline fairly

Applicants have an obvious incentive to describe a target centre as weak, and objectors have the opposite one. Inspectors read a great many of both.

The version that persuades states the indicators, dates them, compares them with the authority's earlier survey, and draws a conclusion that accepts the inconvenient parts. A centre with rising vacancy and strong footfall is a real thing, and describing it accurately is stronger than forcing the evidence into one direction.

An illustrative example: a food store proposal on an edge of centre site serving a market town. The health check reported a frontage survey by unit and floorspace, footfall counts on a Wednesday and a Saturday at three fixed points, and a comparison with the authority's study from four years earlier. Vacancy had fallen slightly, and two national operators had left while four independents had opened. The assessment concluded that the centre was stable and could absorb the diversion modelled, which was a more useful conclusion than either party's opening position.

Where the proposal is not in a centre, the sequential test for retail has to be answered separately, and a health check does not substitute for it.

Where the evidence gets contested

Expect challenge on four fronts. The definition and date of the vacancy survey. The sales density used to estimate turnover. Whether a scheme counts as committed investment, which turns on whether it has permission and whether it is genuinely progressing. And the significance threshold, since the policy test is whether adverse impact is significant rather than whether it exists.

Where wider economic effects are claimed alongside the retail case, they belong in an economic impact assessment with displacement handled explicitly, and where temporary occupation of empty units forms part of the strategy the article on meanwhile use and temporary permissions sets out the mechanics.

One honest uncertainty. There is no agreed national threshold at which trade diversion becomes significant, and inspectors have reached different views on similar percentages in different centres. Treat published decisions as indicative of approach rather than as a figure you can apply.

This is general guidance rather than legal advice. Check the position with your local planning authority or a qualified professional before relying on it.

Browse the PlanScope report types to see what sits behind a retail case, then send the draft for professional review.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.