Walkthrough: nine dwellings on an edge of settlement paddock

A small housing site application pack for nine dwellings sits in an awkward place. The scheme is minor development, so it escapes the major thresholds that bring affordable housing, a Statement of Community Involvement and a Transport Assessment. It does not escape biodiversity net gain, drainage, ecology or highways. The result is an evidence base that costs more than most self-builders expect and takes longer to assemble than the eight week determination period suggests.

What follows is an illustrative walkthrough. The site, the dates and the consultee responses are invented to show the sequence. A real scheme will differ in every particular.

The site, its constraints and the pre-application advice

A 0.6 hectare paddock on the edge of a village, bounded by a mature hedgerow to the north, a lane to the south, and gardens of existing houses to the east. Outside the settlement boundary in the adopted local plan but adjoining it. Flood Zone 1. No listed buildings within 200 m, no Tree Preservation Orders, one ash and two oaks in the boundary hedge.

Pre-application advice cost a few hundred pounds and produced three useful things: confirmation that the principle was arguable given the authority's housing land supply position, a list of the local validation requirements, and the highway officer's early view that the existing field access would need widening and a visibility splay the applicant did not yet own.

That last point is the one worth paying for. A visibility splay over third party land turns a straightforward application into a land assembly problem, and finding out at pre-application rather than at consultation saved several months.

Nine units was a deliberate choice. Ten would have made the scheme major development, engaging affordable housing, a different fee band and a 13 week determination period. Note that in designated rural areas the affordable housing threshold can drop as low as five, so the authority's own policy has to be read before assuming nine is safe.

Ecology surveys and the seasonal programme

A Preliminary Ecological Appraisal was commissioned in late February. Grassland, hedgerow and three mature trees, with an old field shelter in the corner.

The appraisal recommended three follow-on pieces of work: a bat emergence survey of the field shelter, a reptile presence survey of the grassland margins, and a great crested newt assessment of a pond 180 m away. Each has a season.

The programme therefore set itself. Appraisal in February, eDNA in late April, reptile mats laid in April with surveys through May, bat emergence surveys in June and July, reporting in August, submission in September. Missing the April window would have pushed the application into the following spring.

Ecological surveys and licensing require suitably qualified people. A protected species survey and any mitigation licence need a licensed ecologist under the Wildlife and Countryside Act 1981 and the Habitats Regulations, and an AI-assisted draft is a starting point for that specialist rather than a substitute.

Drainage and the lead local flood authority

The lead local flood authority is a statutory consultee on major applications, so a nine dwelling scheme does not automatically trigger its involvement. The authority's local validation list still required a surface water drainage strategy, and the council consulted its drainage officer anyway.

Infiltration testing in the paddock came back marginal, with a shallow clay horizon. The Drainage Strategy therefore proposed attenuation with a restricted discharge to the ditch on the northern boundary at the greenfield run-off rate, supported by a permeability test record and a calculation of storage volume including a climate change allowance taken from the current Environment Agency figures.

Two things saved time here. The ditch was within the applicant's ownership, which removed a third party discharge agreement. And the strategy was written to be conditioned rather than fully designed, which is what a minor application needs. Detailed design belongs at discharge of conditions.

Highways access and visibility

The existing field gate was 3.2 m wide with a hedge running to the carriageway edge on both sides. The highway authority wanted a 4.5 m by 43 m visibility splay in each direction, measured to the nearside carriageway edge, and a bellmouth wide enough for two cars to pass.

Delivering the western splay meant cutting back a length of the applicant's own hedge, which conflicted with the ecology advice about the hedgerow as a commuting route for bats. The resolution was a reduced hedge height rather than removal, agreed with both officers before submission, with replanting behind the splay.

A Transport Statement rather than a Transport Assessment was appropriate at this scale, and the highway officer confirmed that in writing at pre-application. Where a scheme is being promoted in phases, the same questions arrive earlier, which is one of the differences set out in an outline application and reserved matters.

Biodiversity net gain on a small site

Mandatory biodiversity net gain applied to small sites from 2 April 2024, so a nine dwelling market scheme is caught. The requirement is a ten per cent gain measured with the statutory metric, secured for 30 years, with a biodiversity gain plan approved by the authority before development begins.

The paddock was species-poor improved grassland, which is helpful: a low baseline is easier to improve on. The Biodiversity Net Gain Assessment used the small sites metric and found that retaining the hedgerow, creating a species-rich grassland margin along the northern boundary and planting a new native hedge delivered the units on site, with no need for off-site provision or statutory credits.

The Environment Act 2021 regime expects the metric to be completed by a competent person and the gain plan to be approved by the local planning authority, so this is not a document to self-certify.

Three practical points. Hedgerow units are calculated separately from area habitats and both have to show a gain. The 30 year management obligation needs a mechanism, usually a section 106 agreement or a conservation covenant, and the drafting takes weeks. And the baseline must be surveyed before any clearance, because degrading a habitat to lower the baseline is caught by the rules on pre-development activity.

Affordable housing and contributions

At nine dwellings, and outside a designated rural area with a lower threshold, no affordable housing was sought.

Contributions still arrived. The authority had an adopted Community Infrastructure Levy charging schedule, so the scheme carried a levy liability calculated on net additional floorspace, payable on a schedule after implementation. A section 106 agreement secured the biodiversity management obligation and a contribution towards local open space maintenance.

Budget for the legal costs on both sides, and start the section 106 drafting at the point the officer indicates a positive recommendation rather than after committee. Agreements routinely take longer than the determination period they sit inside.

The validated application pack

The submitted pack, in the order the validation officer checked it:

• Application forms and certificates of ownership.
• Location plan, existing and proposed site plans.
• Floor plans and elevations for each house type, plus a street scene.
• A planning statement and a design and access statement.
• The preliminary ecological appraisal and the protected species survey reports.
• The biodiversity net gain assessment and the metric output.
• An arboricultural impact assessment with a tree protection plan.
• The drainage strategy with infiltration test results.
• A transport statement with the visibility splay drawing.
• A Phase 1 land contamination desk study covering the agricultural history.
• A landscape and planting scheme.

Validation took nine days, with one query about the certificate relating to the hedge outside the red line.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission, and several of the documents above require a qualified author. We do not guarantee planning approval. To see which of the 66 report types a site of this kind is likely to need, enter your postcode on PlanScope.