Parking survey: writing the method statement

A parking stress survey is only as good as the method statement you agree before anyone counts a car. Write the method first, send it to the highway authority, get it agreed in writing, and the results are hard to dismiss. Do the fieldwork first and the officer's reply is almost always the same: wrong radius, wrong nights, wrong definition of capacity, please do it again.

The approach most authorities in England recognise derives from the survey methodology developed by the London Borough of Lambeth, which is why agents talk about a Lambeth survey even on sites hundreds of miles from it. What follows is the structure of a method statement that gets agreed on the first pass.

Defining the survey area and radius

State the radius, state how it is measured, and state what you included inside it.

The convention is a 200 metre walking radius from the site boundary, measured along the actual walking route rather than as a straight line, on the reasoning that residents will park within a short walk of home. Some authorities ask for a wider area in low-density suburbs, and some restrict it where a controlled parking zone boundary falls inside the radius. Ask before you assume.

The method statement should list every street or street section surveyed, with a plan showing the extent marked and each section given a reference. Say explicitly what is excluded and why: private driveways and off-street spaces are normally outside the survey, as are bays where parking is legally prohibited at all times. If a street has a controlled parking zone with resident permits, say so, because permit-holder bays and unrestricted kerb behave differently.

One boundary decision is worth setting out in full. Where a busy district centre or a station car park sits just inside the radius, its parking behaviour will distort the figures, so either exclude it with a stated reason or report it as a separate sub-area.

Choosing neutral survey dates

Neutral means the counts reflect ordinary conditions, and the method statement has to show how you achieved that.

Avoid school holidays, half terms, the fortnight either side of Christmas, Easter week, bank holiday weekends and any local event that changes parking demand, such as a market day, a match day or a festival. Avoid periods of street works in the survey area. Traffic and parking work is normally kept to the neutral months, which excludes August and December.

Say in the statement which weeks you propose and confirm that they avoid the local school calendar for the authority in question. Name the two survey nights. Weather matters too: heavy rain or snow suppresses on-street parking, so include a commitment to abandon and repeat a night where conditions are abnormal, and record the weather on each survey sheet.

Overnight and daytime count timings

The residential parking stress question is answered at night, because that is when residents are home and demand peaks.

1. Two overnight counts, one on a weekday night and one at the weekend, each recorded between 00:30 and 05:30.
2. A minimum of two passes on each night, spaced far enough apart to confirm the peak rather than catch a single moment.
3. Where a daytime picture is needed, typically for a commercial or mixed use proposal, add counts at an agreed daytime peak, often late morning and mid afternoon.
4. Record the exact time each street section is surveyed, so the sequence and duration of each pass are auditable.

For a proposal that changes daytime demand, such as an office or a nursery, the overnight count alone tells the authority nothing useful. Say which counts answer which question. A house in multiple occupation application is an overnight question. A change of use serving daytime visitors is not, and the same distinction drives the evidence in the checklist before submitting a prior approval application.

Recording capacity and occupancy

Capacity is the figure people get wrong, and a disputed capacity destroys the whole survey.

Where bays are marked, capacity is the number of marked bays. Where kerb is unmarked, capacity is calculated from the measured usable kerb length divided by an assumed vehicle length, commonly 5.0 metres or 5.5 metres per vehicle, with the assumption stated. Deduct dropped kerbs and vehicle crossovers, junction protection distances, bus stops and their clearways, loading bays during their hours of operation, disabled bays, cycle hangars, electric vehicle charging bays, taxi ranks and any length within the standard distance of a junction where parking is prohibited.

Measure the kerb rather than estimating it. A measuring wheel and a photographic record of each section is normal practice, and the photographs are what settle an argument about a deducted length later.

Occupancy is the count of vehicles actually parked at the time of survey, including any parked illegally, because an illegally parked car still occupies the space. Note illegal parking separately so the authority can see both figures. Record motorcycles, vans and any long-term abandoned vehicles distinctly.

Calculating parking stress

Parking stress is occupancy divided by capacity, expressed as a percentage, calculated for each street section and for the survey area as a whole.

The convention many authorities apply is that an area above 85 per cent stress is considered to be at or near capacity, on the basis that at that level a driver can no longer reliably find a space near their destination. Below that figure there is normally headroom for additional demand. Present the calculation openly: capacity, occupancy and stress per section, then the totals, then the area figure for each survey night.

The assessment then compares the existing stress against the stress that would result from the proposal's expected demand. Set out the demand assumption and where it comes from, whether that is the census travel to work and car ownership data for the output area, the authority's adopted parking standards, or a trip database used under licence. Illustrative worked example: a survey area with 180 usable spaces and 149 vehicles parked overnight is at 83 per cent stress, and adding a proposal generating four additional overnight vehicles takes it to 85 per cent. That is a finely balanced result, and reporting it honestly is more persuasive than rounding it.

Presenting results and plans

The report should stand on its own for an officer who was not there.

Include the agreed method statement as an appendix, a location plan with the radius drawn and each street section numbered, a capacity schedule showing measured kerb length and every deduction, the raw count sheets for each pass, a summary table of stress by section and by night, photographs of each section, and a weather and conditions log. Then the analysis, then the conclusion.

Keep the conclusion narrow. A parking survey shows what the stress was on the nights surveyed. It does not show that the development will be acceptable, and claiming that it does invites an officer to attack the survey rather than engage with it. The policy case belongs in the Planning Statement, supported by the survey rather than replaced by it.

Agreeing the method with the highway authority first

Send a short scoping note before fieldwork, covering the proposed radius and streets, the survey dates and why they are neutral, the count times, the capacity assumption including the metres per vehicle figure and the deductions you intend to make, the stress threshold you will report against, and the demand assumption for the proposal.

Ask for written agreement or written comments. Most highway officers reply within a couple of weeks, and the reply is worth waiting for, because a survey done to an agreed method is extremely hard to reject on method grounds. Where the authority will not engage before submission, record the attempt and the date in the method statement, then apply the standard approach and justify each assumption.

A short note, sent early, is what separates a survey that decides an application from one that gets ignored.

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