Crossing ten dwellings: what major status changes

Ten dwellings is where a housing scheme stops being a minor application and becomes major development, and almost every part of the process changes with it. The determination period moves from eight weeks to 13. The council has to advertise the application in a local newspaper. Affordable housing policy engages. The fee jumps into a different band, the validation list grows, and the decision is far more likely to go to committee. None of that is discretionary, because the definition sits in secondary legislation rather than in local policy.

So the unit count on the drawing is a procedural decision as much as a design one.

How the procedure order defines it

Article 2 of the Town and Country Planning (Development Management Procedure) (England) Order 2015 defines major development. For housing, the trigger is the provision of 10 or more dwellinghouses, or a site of 0.5 hectares or more where the number of dwellings is not yet known. Separately, any development creating 1,000 m² or more of floorspace, or on a site of one hectare or more, is major whatever it contains.

Read the definition carefully on a mixed scheme. Nine houses on a 0.6 hectare site is still major, because the site area limb bites on its own when the number is unknown at outline stage, and the one hectare limb catches larger plots regardless of density. The same thresholds sit behind the flags PlanScope raises when it checks a site, and a council's own validation list takes precedence over any automated prompt.

The determination clock moves to 13 weeks

Non-major applications carry an eight week statutory period. Majors carry 13 weeks, and development requiring an environmental statement carries 16. Those periods run from validation rather than from the day you pressed submit, which is where most programmes slip, and they can be extended by written agreement.

The practical effect is not just the extra five weeks. It is the consultee cycle that fits inside them: the lead local flood authority, the highway authority, the county archaeologist and, on larger schemes, statutory consultees who have their own 21 day clocks. More detail on how the periods interact sits in our note on determination periods and what sets them.

Publicity and the newspaper notice

Article 15 of the same order sets the publicity requirements. For major development the council must publish a notice in a newspaper circulating in the area, and either post a site notice or serve neighbour notification. For non-major householder and minor applications, a site notice or neighbour letters alone will do.

That newspaper notice has two consequences worth planning for. It reaches people who never look at the planning register, so objection numbers tend to rise. And it adds a fixed step the council controls, which is one more reason the 13 weeks is rarely generous.

Affordable housing engages

Below 10 units most authorities do not seek an affordable housing contribution. At 10 and above, national policy and the adopted local plan generally do, through on-site provision or a commuted payment secured by a section 106 agreement. Designated rural areas can apply a lower threshold, and some local plans set their own, so the adopted policy is what the case officer applies rather than the national figure.

Expect to submit an Affordable Housing Statement setting out the tenure split, the unit mix, the policy percentage and how the provision is to be secured. Where the scheme cannot carry the policy requirement, that argument belongs in a viability appraisal submitted with the application, not raised at committee.

The fee step

Planning application fees are set by regulations, were uplifted in December 2023 and have been indexed annually from April 2025. Fees for housing are charged per dwelling up to a threshold and then at a reduced rate, so the total rises sharply as the unit count climbs. Rather than quote a figure that will be out of date, work from the current schedule and the national fee guidance before you commit to a programme. Our article on how planning fees escalate with unit numbers sets out the shape of the curve.

Budget for the evidence base as well. The fee is usually the smallest line. A drainage strategy, an ecological appraisal with a metric output, a transport statement and an arboricultural report will between them cost several times the application fee on a typical ten unit site, and most of them have to be commissioned before the drawings are finished rather than after.

Validation items that only apply to majors

Every local planning authority publishes a local validation list alongside the national requirements, and the major column is longer. Common additions at this scale include a drainage strategy with calculations rather than a statement of principle, a transport statement or assessment depending on trip generation, an arboricultural impact assessment where trees are affected, an ecological appraisal with the biodiversity metric output, and a statement on how the scheme was informed by consultation.

Check the list for the authority before you draw up the fee proposal for your client. The gap between two neighbouring councils can be three or four documents.

Delegation, committee and design review

Most minor applications are decided by officers under delegated powers. Schemes of delegation vary, and a major housing application is far more likely to be reported to planning committee, particularly where there are objections or a departure from the development plan. Some authorities also refer majors to a design review panel, which adds a meeting and a response to the programme.

Build committee cycles into the timeline. A report that misses one agenda waits for the next, and over the Christmas or summer recess that can be six weeks.

The officer's report itself takes longer to write at this scale, because it has to work through the development plan policies, the consultee responses and the planning balance in a form that will stand up if the decision is challenged. Give the case officer the material in a shape they can lift into that report and the timetable improves.

Designing either side of the line

There are honest reasons to sit at nine units and honest reasons to go to 12. A nine unit scheme avoids the affordable housing contribution, the newspaper notice and the longer determination period, which on a tight site with a small developer can decide whether the scheme happens at all.

But artificially splitting a larger site into sub-ten phases to avoid policy is a well-recognised tactic and officers treat it as such. Where phases share an access, a drainage strategy and a landscape structure, expect the authority to assess them as one scheme. An illustrative case: a 0.55 hectare paddock brought forward as two applications of eight and seven dwellings, six months apart, with a shared spine road, was treated as a single major development for affordable housing purposes. That is the usual outcome.

The better approach is to decide the unit count on the merits of the site, then programme the evidence base around whichever side of the threshold you land on. This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.

Browse the full set of report types to see what a major housing application typically needs before you commission anything.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.