Checklist for a parking survey to the accepted method

A parking stress survey is fieldwork, and fieldwork gets rejected on procedure rather than on findings. Highway officers see the same failures repeatedly: one night instead of two, a count taken in half term, a capacity figure with no stated method, a catchment drawn to produce a helpful answer. A parking survey methodology checklist exists to stop a landlord paying twice for the same data.

What follows is the structure of the approach commonly used for residential parking stress work, often referred to as the Lambeth methodology after the London borough whose practice shaped it. It is a convention rather than a national standard, so confirm the authority's own requirements before booking surveyors.

Defining the survey area and the walking distance

Draw the catchment first, and draw it before you know the answer.

The usual approach takes the application site and every street within a walking distance of around 200 metres, measured along actual walking routes rather than as the crow flies. Where a street is partly inside and partly outside, include the whole section between junctions rather than cutting it mid-block.

Four rules keep the catchment defensible. Use real walking routes, so a street across a railway line with no crossing is excluded even if it is 150 metres away in a straight line. Divide the area into numbered street sections on a plan, with each section having its own capacity and count. Include the site frontage itself. And agree the catchment with the highway officer in advance, in writing, because that single email removes the most damaging objection a survey can attract.

If the authority asks for a different distance, use theirs. Some boroughs specify 200 metres, others work to a different figure or ask for a tiered analysis.

Choosing survey dates and avoiding school holidays

Dates do more damage to surveys than counting errors.

Avoid school holidays and the weeks either side of them, bank holidays, the fortnight around Christmas and New Year, and any local event that changes parking patterns. Avoid weeks when a street in the catchment is closed for roadworks or utility work, and avoid periods when a nearby development is under construction with contractor vehicles on street.

Term time is the standard. A neutral month with settled weather is better than one with heavy rain, because wet nights change where people park.

Record what you avoided and why. A methodology section stating that the survey was carried out in term time, outside school and public holidays, with no roadworks recorded in the catchment, closes off a line of challenge before it opens.

Overnight and daytime count timings

For residential parking demand, the overnight period is what matters, because that is when the resident population is at home and parked.

1. Carry out counts on at least two separate nights, normally one weeknight between Monday and Thursday and one weekend night.
2. Survey in the early hours, within a window around half past midnight to half past five, when arrivals and departures are at their lowest.
3. Complete each full circuit of the catchment within a short enough period that vehicles are not double counted or missed, and record the start and finish time of each circuit.
4. Where the proposal affects daytime demand, such as a conversion with staff or visitors, add daytime counts at the relevant hours and report them separately.
5. Note the direction and order of the walked route so the survey can be repeated identically.

Two circuits per night is common practice, and reporting the higher of the two as the demand figure is the cautious approach. Say which you have done.

Recording usable kerb length and restrictions

Capacity is the half of the calculation most often done badly, and it is the half an officer can check from a desk using street imagery.

Measure the usable kerb and convert it at a stated allowance per vehicle, commonly five metres for unrestricted kerb. Count marked bays as the number of bays rather than by length. Then exclude, with the exclusions listed on the plan:

• Dropped kerbs and vehicle crossovers.
• Bus stops, bus cages and taxi ranks.
• Loading bays, disabled bays and permit-only bays, which are reported separately rather than as general capacity.
• Lengths within a stated distance of a junction, commonly ten metres, where parking would be unsafe or obstructive.
• Access points, fire hydrant markings and dropped crossings at pedestrian crossing points.
• Lengths with double yellow lines or other full-time restrictions.

Record the controlled parking zone hours for every street section, because capacity during zone hours and capacity overnight are different numbers. Where the zone operates only in the daytime, the overnight capacity may include lengths that are unavailable at noon.

Calculating parking stress and the threshold used

Parking stress is parked vehicles divided by usable capacity, expressed as a percentage, calculated per street section and for the catchment as a whole.

The figure commonly treated as the point at which a street is effectively full is 85 per cent, because above that level drivers spend time searching and park inconsiderately. That is a convention in widespread use rather than a national standard, and some authorities apply a different figure or assess the catchment as a whole rather than street by street. Check the local requirement and state which threshold you have applied and why.

Report both the section figures and the catchment figure. A catchment at 78 per cent containing three streets above 95 per cent tells a different story from one evenly loaded, and presenting only the average invites an officer to recalculate.

Weather, roadworks and anomalies to record

Keep a field log. For each night: the date, the start and finish times, the weather, the surveyor's name, and anything unusual observed.

Anomalies worth recording include a street closure, a skip or scaffolding occupying kerb space, an unusual concentration of vehicles suggesting an event, a broken down vehicle left in place across both nights, and construction compounds. Each of these changes a section count, and a survey that notes them and explains their treatment is more credible than one that reports clean numbers.

Photographs help. A dated photograph of each street section, taken on the survey night, lets a reviewer sanity check the capacity assessment without visiting.

Presenting results so the highway officer can check them

The report should let the officer reproduce your figures. That means:

Keep the conclusions short and attached to the numbers. A parking survey that states the catchment stress, identifies the sections above the threshold and then says what that means for the proposal is doing its job. One that opens with a conclusion and buries the method is read with suspicion.

Where the survey supports an application, the findings belong in the transport statement as well, with the survey appended rather than summarised.

Where surveys are rejected

The recurring reasons, in rough order of frequency.

A single night surveyed, which gives no way to identify an anomalous result. Counts taken in school holidays or at Christmas. A capacity figure with no stated method, so the stress percentage cannot be checked. A catchment smaller than the authority expects, or drawn to exclude the busiest streets. Counts taken in the evening rather than overnight, which understates residential demand. And missing raw data, which means the officer has nothing to audit.

All six are procedural, and all six are avoidable by agreeing the scope first. Run the finished document through the same checks as any other submission, which an internal quality check on a planning submission covers, and where a travel plan accompanies the application, make sure the parking findings and the travel plan targets and monitoring tell a consistent story. Browse the report types by category to see which transport documents a conversion is likely to need.

This is general guidance, not legal advice. Parking survey requirements vary by authority, so check the position with your local planning authority, the highway 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.