Document bundle for a scheme crossing the ten dwelling mark

The list of major development documents ten units triggers is longer than most self-builders expect, and the jump happens at exactly ten dwellings. Nine homes is a minor application with an eight week determination period. Ten is a major, with thirteen weeks, newspaper publicity, the lead local flood authority as a statutory consultee, an affordable housing expectation and the full statutory biodiversity metric rather than the small sites version. One extra plot changes the submission, the programme and the cost.

Which is why schemes so often sit at nine. That is a legitimate design decision, but it has to be an honest one.

What changes at ten dwellings

Major development is defined in the Development Management Procedure Order. For residential schemes it means the provision of ten or more dwellings, or, where the number is not yet known, a site area of half a hectare or more. For other development it is 1,000 m² of floorspace or a site of one hectare.

Note that the half hectare trigger catches low density schemes of fewer than ten homes where the dwelling count is not fixed at application stage, which is one reason outline applications on larger plots end up as majors unexpectedly.

Affordable housing evidence

National policy sets the threshold for seeking affordable housing contributions at major development, which for housing means ten or more homes, with a lower threshold available to authorities in designated rural areas such as National Landscapes and National Parks. Below the threshold the expectation falls away. At or above it, the local plan percentage applies.

The document is an Affordable Housing Statement and it has to do four things. State the policy requirement and the arithmetic that produces the number of homes. Set out the tenure split against the policy, distinguishing social rent, affordable rent, shared ownership and any First Homes requirement. Show the distribution on a plan with plot numbers, addressing any cluster limit in the policy. And confirm whether a registered provider has been approached and on what terms.

Where the requirement cannot be met in full, the argument has to be made through a viability assessment on the national guidance, with a suitably qualified author and professional review strongly advised. An assertion in the covering letter will be treated as no evidence at all.

Statutory consultees triggered at major scale

The lead local flood authority became a statutory consultee for surface water drainage on major development in 2015, and that single change does more to shape a ten unit submission than anything else on this list. Its consultation response is on drainage design rather than flood risk from rivers, and it can and does recommend refusal where the strategy is thin.

Other consultees depend on the site rather than the scale. The Environment Agency comments where the site is in Flood Zone 2 or 3 or raises groundwater or contamination issues. Natural England comments where a designated site, a nutrient neutrality catchment or protected species licensing is engaged. Historic England engages on higher grade listed buildings and scheduled monuments. The highway authority comments on access and trip generation at any scale, with more attention at major level. Active Travel England becomes a statutory consultee only at much larger thresholds, so a ten unit scheme will not see it.

Environmental impact assessment is also unlikely at this scale. The screening thresholds for urban development projects in Schedule 2 to the 2017 Regulations are set well above ten dwellings, so screening is normally only needed where the site is in or near a sensitive area. If screening is required, remember that an Environmental Statement must be prepared by competent experts under those Regulations, and a drafted document is only a starting point for that team.

Drainage and the lead local flood authority

Expect to submit a drainage strategy rather than a drainage note. What the authority looks for, in rough order of how often it is missing:

1. Infiltration testing to the recognised method, with results, or a clear statement of why infiltration is not feasible with evidence behind it.
2. Greenfield run-off rates calculated for the site, with the method and the catchment characteristics stated.
3. The discharge hierarchy worked through in order, from infiltration to watercourse to sewer, with written evidence of refusal before moving down a step.
4. Attenuation volumes for the design event with the climate change allowance, plus the urban creep allowance.
5. Water quality treatment appropriate to the land use, using a recognised treatment index approach.
6. Exceedance routes drawn, with depths rather than arrows alone.
7. A maintenance plan and a statement of who will own and maintain each component for the design life.

A Drainage Strategy that covers those seven points usually clears consultation in one round. Where the site has a public sewer crossing it, the water undertaker's build-over or diversion requirements run on a separate timetable that can outlast the planning application, and the note on documents for a site crossed by a public sewer sets out what that involves.

Foul drainage needs its own answer at this scale. Ten homes discharging to a sewer may need a capacity check from the undertaker, and ten homes on a package treatment plant need a consent and a demonstration that the receiving watercourse can take it.

Biodiversity net gain at major scale

Mandatory biodiversity net gain applied to major development from 12 February 2024 and to small sites from 2 April 2024, so the duty itself is not new at ten units. What changes is the tool. The small sites metric is available only to small sites, and a major scheme has to use the full statutory biodiversity metric, which needs a more detailed habitat condition assessment and produces a longer gain plan.

The practical consequences:

A habitat survey in the growing season, which runs roughly April to September for botanical work, so a winter instruction means a spring survey and a programme delay.

A baseline condition assessment on the full metric, with each parcel assessed against published condition criteria rather than the simplified small sites categories.

A 10 per cent net gain secured for 30 years, with onsite units preferred, then offsite units, then statutory credits as a last resort at a price set nationally.

A biodiversity gain plan that the authority must approve before development may lawfully begin, which is a post-permission step with its own timetable.

The Biodiversity Net Gain Assessment rests on that metric, and the Environment Act 2021 regime expects a competent person to complete it with the gain plan approved by the local planning authority. A drafted assessment is the frame that person works in, never a substitute for their judgement.

Transport material at this scale

Ten homes rarely needs a full Transport Assessment. The recognised trigger points for one sit much higher, commonly around fifty dwellings or 2,500 m² of floorspace, and a scheme at ten units is normally served by a Transport Statement covering access geometry, visibility, trip generation, parking provision against the local standard, cycle parking, refuse vehicle tracking and construction access.

Two things are worth more than the document itself. A swept path drawing showing a refuse vehicle entering, turning and leaving without reversing more than the authority's limit, because refuse access is the most common highway objection at this scale. And a visibility splay drawing with the sight lines dimensioned from the correct setback for the road's speed, based on measured speeds rather than the posted limit.

A travel plan is usually reserved for larger schemes, though some authorities ask for a travel information pack for residents at this scale as a condition.

Levy and obligation paperwork

Two financial instruments sit on a major application and they are not alternatives.

The Community Infrastructure Levy, where the authority has a charging schedule, is calculated on net additional floorspace. Submit the levy additional information form with the application, claim any deduction for in-use buildings being demolished, and claim self-build or social housing relief before work starts if it applies. Missing the sequence is expensive and the regulations offer little sympathy.

A section 106 agreement will usually be needed for the affordable housing, open space, and any education or health contribution the authority seeks. Draft heads of terms and submit them with the application rather than waiting to be asked. An agreement that starts being drafted after the committee resolution is what turns a thirteen week target into nine months.

Fees, publicity and the determination period

The fee for a major residential application is set by the fee regulations, with a base amount and a per dwelling increment that changes structure above fifty units. Fees were uplifted in December 2023 and are indexed annually from 1 April, so take the figure from the current national schedule on the day you submit.

Publicity for a major is by site notice and newspaper advertisement, which the authority arranges and which adds to the elapsed time before the consultation period closes. The statutory determination period is thirteen weeks, and most authorities will ask for an extension of time agreement. Agreeing one is usually sensible, since the alternative is a refusal on incomplete information.

Validation is the step that derails more major applications than any other. Every authority publishes a local validation list in addition to the national requirements, and at major scale that list is long. Read it against your document schedule before submission, not after the validation query arrives.

To see the likely document set for a scheme at this scale, browse the report types by category and work through the guided questions for your site.

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