Survey programme for a spring start on site

A survey programme for a spring start is built backwards, and the fixed points are ecological. Planning determination periods can be nudged with an extension of time. A great crested newt survey window cannot. If you want to be on site next March, the surveys that constrain the programme need to be booked this winter for a summer season, because missing a window costs a year rather than a month.

Everything else on a small residential scheme bends around those dates.

Working backwards from the start date

Take the date you want machines on site and subtract, in order: the time to discharge any conditions that bite before work starts, the determination period, the preparation of the application, and the survey season that feeds it.

On a minor application the determination period is eight weeks, thirteen for a major and sixteen where an environmental statement is involved, and extensions of time are common. Condition discharge is a separate application with its own period, typically eight weeks, and conditions worded to bite before work starts have to be cleared first.

So a March start realistically needs permission by the previous autumn, an application submitted in early summer, and survey work completed in the spring and early summer before that. Two growing seasons is not unusual for a scheme with ecological constraints.

Surveys with fixed seasons

These are the immovable ones. Dates are the standard optimal windows used by ecologists in England, and the detail of what each survey requires is set by the relevant good practice guidance.

Two traps. Wintering bird work and breeding bird work occupy opposite halves of the year, so a site needing both takes twelve months whatever the budget. And a Protected Species Survey requiring several visits cannot be compressed by paying more, because the visits have to be spaced.

Surveys you can do at any time

The good news is that most of the application pack is season-independent.

• Topographical and measured building surveys.
• Ground investigation and contamination desk studies.
• A Tree Survey to BS 5837:2012, though canopy assessment is easier in leaf.
• Drainage infiltration testing, subject to groundwater conditions in winter.
• Heritage assessment and archaeological desk-based work.
• Flood risk assessment and drainage design.
• Daylight and sunlight modelling, which is computational and uses fixed reference dates rather than site visits.

Agricultural land classification can be done at most times but not when the ground is waterlogged, which in practice rules out much of a wet winter.

Surveys constrained by human activity

A separate category of survey has to avoid school holidays and other atypical periods, because the point is to capture normal conditions.

Traffic counts are taken in neutral months, avoiding August and the weeks around Christmas. Noise surveys avoid school holidays where the receptor environment depends on term-time activity. A Parking Survey following the established overnight methodology needs a midweek and a weekend night outside holiday periods.

None of these takes long, but all of them have blackout periods, and a scheme that finishes its design in mid-July can lose six weeks waiting for September.

Licences and their lead times

Permission is not the last hurdle where protected species are present. A European protected species mitigation licence is applied for after planning permission is granted, and the determination period is measured in weeks rather than days. Verify the current service standard before relying on a figure, and build in time for the application to be returned for further information.

The licence application requires a method statement, a reasoned justification against the statutory tests, and a named licensed ecologist. Work cannot lawfully begin on the affected feature until the licence is in place, and exclusion or translocation work has its own seasonal constraints on top.

Biodiversity net gain adds another gate. The biodiversity gain plan has to be approved by the authority before development starts, and the baseline habitat condition assessment behind it sits in the botanical season. A Biodiversity Net Gain Assessment prepared from a winter baseline is routinely challenged on condition scoring.

Where the programme usually slips

Four places, in order of frequency. Each one is avoidable, and each one recurs on small residential schemes where the design team assumes ecology can be picked up later.

1. The preliminary appraisal is commissioned too late, so the survey it recommends misses the season.
2. Condition discharge is treated as a formality rather than as a further application with its own eight-week period.
3. The licence is left until after permission with no time allowed for it.
4. The net gain baseline is taken outside the botanical season and has to be repeated.

The first is the expensive one. A Preliminary Ecological Appraisal is the document that tells you which fixed windows apply to your site, and it can be done in any month. Commissioning it in January rather than June is the least expensive programme decision available.

An illustrative sequence for a small site

Illustrative example only, for a four-plot scheme with a mature hedgerow, one outbuilding and a pond within 250 metres of the site.

January: preliminary ecological appraisal and desk study. Topographical survey. Tree survey. February and March: design work. Drainage testing. Heritage and contamination desk studies. Mid-April to June: great crested newt eDNA sampling of the pond. Habitat condition survey for the net gain baseline. May to August: bat emergence surveys of the outbuilding, spaced across the season. September: application prepared with all survey results included. October to December: determination, allowing for an extension of time. January and February: condition discharge application. Licence application if required. March: start on site.

Nothing in that sequence is heroic. It works because the appraisal came first and because the application waited for the survey results rather than being submitted with a promise to supply them later.

Slip the January appraisal to May and the newt window has gone, the bat season starts before you know whether you need it, and the whole sequence moves to the following year.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. Protected species surveys and mitigation licences require a suitably licensed ecologist, and biodiversity net gain assessment requires a competent person under the Environment Act 2021. 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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