Walkthrough: nine dwellings on a village edge site

Nine dwellings is a deliberate number. One more and the scheme becomes major development, which brings a 13-week determination period, a statutory drainage consultee, an affordable housing policy requirement in most authorities and a fee that steps up sharply. This walkthrough follows an illustrative scheme of nine houses on a paddock at the edge of a village, immediately outside the settlement boundary, and shows how that single decision shaped the evidence base. It is an illustrative example rather than a real application.

The site and its position against the settlement boundary

The site is a 0.42 hectare paddock with a hedge on three sides, bounded by the rear gardens of a row of cottages to the west and open fields to the east. The adopted local plan draws the settlement boundary along the western hedge, so the site is countryside in policy terms.

That single fact set the structure of the Planning Statement. The case had to be made on the basis that the site adjoins the built form, is served by a footway to the village shop and primary school, and that the authority could not demonstrate the housing land supply its plan assumed. Outside the boundary, the sequential logic of the plan is against you, so the statement led on sustainability of location and on supply, then dealt with landscape and character.

At 0.42 hectares the site also sits below the half-hectare trigger that would have made it major development on area alone.

Staying below the major development threshold

Major development for these purposes means ten or more dwellings, 1,000 square metres or more of floorspace, or a site of half a hectare or more. Nine houses on 0.42 hectares clears all three.

What that avoided:

• A 13-week determination period, replaced by eight weeks.
• The lead local flood authority as a statutory consultee on surface water.
• An affordable housing requirement, which in this authority applies at ten units and above.
• A statement of community involvement as a validation requirement.

What it did not avoid was the biodiversity gain condition, which applies to small sites as well, or the highway authority's interest in the access. And the density conversation still happened: nine units on 0.42 hectares is a little over 21 dwellings per hectare, which the officer queried as an inefficient use of land. The answer was plot depth and the retained hedge, not a revised scheme.

Biodiversity net gain on a small site

Mandatory biodiversity net gain under the Environment Act 2021 applies to small sites from 2 April 2024, requiring a 10 per cent measurable gain secured for 30 years. A paddock is not a blank slate: improved grassland scores low on the statutory metric, but the hedges score, and one of them was species-rich.

The sequence used was a preliminary ecological appraisal first, then a baseline habitat survey feeding the small sites metric, then a design response. Losing part of the eastern hedge to the access would have created a shortfall that on-site enhancement could not cover, so the access was moved north to a gap in the boundary and the hedge retained.

The biodiversity gain plan itself is approved after permission, under the deemed condition, but the metric and the habitat plan went in with the application because the officer could not otherwise assess the layout. A licensed or competent professional is required for this work under the Environment Act 2021 regime, and an AI-assisted draft is a starting point for that person rather than a substitute.

Highways, access and visibility

The access takes the form of a single priority junction onto a 30mph village street. Visibility splays were drawn at 2.4 metres by 43 metres in each direction, following the stopping sight distance guidance in Manual for Streets for that speed, with a supporting speed survey because recorded speeds were slightly above the limit.

The scheme is below the threshold at which a full transport assessment is usually expected, so a Transport Statement was submitted instead, covering trip generation, the access geometry, refuse vehicle tracking, cycle parking and the two visitor spaces. Refuse tracking mattered more than trip generation: the internal layout had to allow a 26-tonne vehicle to turn without reversing more than the authority's stated limit.

Nine dwellings generate few enough movements that capacity was never the issue. Geometry was.

Drainage strategy and infiltration testing

The lead local flood authority was not a statutory consultee at this scale, so the drainage work was reviewed by the council's own engineer. That is not a reason to do less of it.

Infiltration testing followed the soakaway method in BRE Digest 365, with three trial pits. Two drained acceptably and one did not, which put a swale and a small attenuation basin at the low corner of the site rather than individual soakaways throughout. Greenfield run-off rates were calculated for the existing paddock and used as the discharge limit, with climate change allowances applied from the current Environment Agency tables.

Foul drainage went to the public sewer after a capacity enquiry to the undertaker. Had it not, the whole scheme would have needed the package treatment plant route style of evidence, which changes the layout because of separation distances.

Affordable housing policy at this scale

Nine units fell below the authority's threshold, so no on-site provision or commuted sum was sought. In designated rural areas the threshold can be lower, and some authorities pursue contributions from schemes of five or more, so this is the first thing to check in the adopted plan rather than assume.

The officer did raise the point that the site could accommodate ten or eleven units, and that a scheme of that size would have triggered affordable provision. That is a fair question, and the honest answer in the statement was that the layout responds to the plot pattern of the adjoining cottages. Whether an inspector would have accepted it if the application had gone to appeal is an open question.

The submitted pack in full

1. Application forms, ownership certificate and the correct fee for nine dwellings.
2. Location plan and existing and proposed site plans, with levels.
3. House type plans and elevations, and a street scene drawing.
4. Planning Statement covering location, supply, landscape and the development plan balance.
5. Design and Access Statement, not statutorily required at this scale but requested locally.
6. Preliminary ecological appraisal and statutory metric output with a habitat plan.
7. Arboricultural survey to BS 5837:2012 with a tree protection plan for the boundary trees.
8. Transport Statement with visibility and tracking drawings.
9. Drainage strategy with infiltration test results and run-off calculations.
10. Landscape and planting strategy.
11. Phase 1 contamination desk study, because of the former agricultural use and a filled hollow shown on historic mapping.

That is eleven documents for nine houses, which surprises self-builders every time. Compare it with the bundle in the care home walkthrough to see how much of the list is driven by site constraints rather than by scale.

The conditions imposed

Permission came with the usual suspects: three-year time limit, approved drawings, materials samples, hard and soft landscaping with a five-year replacement clause, the drainage details, the tree protection measures, construction hours, and retention of the visibility splays free of obstruction above 0.6 metres.

Two are worth noting. Permitted development rights were removed for extensions and outbuildings on the two plots nearest the open countryside, to control the visual edge of the village. And the biodiversity gain plan condition had to be discharged before any works began, which the self-builder had not programmed and which added six weeks.

Programme the gain plan at the same time as the building regulations submission. 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. We do not guarantee planning approval. For specialist technical reports, qualified professional input may be required. Enter your postcode on PlanScope to see which reports a site like this needs.