Building in the Northern Ireland countryside: the CTY tests

If you want to build a house in the Northern Ireland countryside, your proposal has to fit one of the categories set out in the CTY policies of Planning Policy Statement 21, Sustainable Development in the Countryside. There is no general presumption that a single dwelling in open countryside is acceptable. You either meet a defined test, such as the farm dwelling policy or the ribbon infill exception, or the application is refused in principle. This article covers Northern Ireland only, and nothing in it applies to sites in England, Wales or Scotland.

That framing catches people out, particularly anyone used to the English approach of weighing harm and benefit in a planning balance. In Northern Ireland the first question is categorical.

Where countryside policy sits in the framework

Planning in Northern Ireland runs under the Planning Act (Northern Ireland) 2011, which transferred most development management decisions to the 11 councils in April 2015. The Strategic Planning Policy Statement for Northern Ireland sets the overarching policy direction, and it retains a number of earlier planning policy statements as transitional policy until each council adopts its own Local Development Plan.

PPS 21 is one of those retained statements. Where a council has adopted a new Local Development Plan, the plan's own countryside policies take over, so the first thing to check is which council area the site sits in and what stage its plan has reached. Councils publish that on their own planning pages, and the position changes.

The tests for a dwelling on a farm

The farm dwelling policy is the most used route and the most rigorously applied. Three requirements do most of the work.

1. The farm business must be currently active and established. The policy sets a minimum period of six years, evidenced through the business identification number and the records held by the Department of Agriculture, Environment and Rural Affairs.
2. No dwellings or development opportunities may have been sold off from the farm holding within the preceding ten years, other than to a family member.
3. The new building must be sited to visually link or cluster with an established group of buildings on the farm.

The third test is where most refusals happen. A site chosen for the view, at the top of a field and a hundred metres from the yard, will fail the clustering requirement however good the farm evidence is. Officers use aerial imagery and site visits, and they are consistent about it.

Evidence matters here. Submit the business identification number, the farm maps, and a short statement explaining the farm's activity and its holding history. And be honest about earlier sales, because the department's records will show them.

Clusters, ribbons and infill

A separate policy allows a new dwelling within an existing cluster of buildings, where the cluster lies outside a farm, appears as a visual entity in the local landscape, is associated with a focal point such as a school, church or community hall, or is located at a cross-roads. The new dwelling has to be absorbed into the cluster rather than extending it outwards.

Ribbon development is dealt with by CTY 8, which refuses proposals that would create or add to a ribbon. A ribbon is generally understood as a line of three or more buildings along a road frontage without accompanying development to the rear. The exception is narrow: a small gap site sufficient to accommodate up to a maximum of two dwellings, within an otherwise substantial and continuously built up frontage.

Read the words "substantial and continuously built up" carefully. A frontage with a field gap, a lane or a set back bungalow usually is not continuous, and the exception then falls away. Measure the gap, photograph the frontage in both directions and plot the building line before you commission a full design.

Replacement dwellings

Replacement of an existing rural dwelling is permitted where the building to be replaced exhibits the essential characteristics of a dwelling and, as a minimum, all its external structural walls are substantially intact. A ruin with two gables standing does not qualify, however clearly it once was a house.

The replacement is normally expected to occupy the same site as the building it replaces, with limited flexibility where a different position would produce a better relationship with the landscape or with access arrangements. Scale is controlled too, so a modest cottage does not automatically justify a very large replacement.

Photograph the existing building thoroughly, including internal and external views of every wall, and record the roof. Once demolition happens, the evidence goes with it.

Personal and domestic circumstances

There is a route for cases of compelling personal or domestic circumstances, and it is exceptional in practice. Expect to provide detailed supporting evidence, usually medical, and to accept an occupancy condition tying the dwelling to the named person or to a defined category of occupier.

Applicants sometimes treat this policy as a general fallback when the farm or cluster tests fail. It is not, and a weak application under it uses up time and fee money without improving the underlying position.

Design, integration and rural character

Meeting a category test gets you past the first hurdle. The proposal then has to satisfy the integration and design policy at CTY 13 and the rural character policy at CTY 14. In practice that means:

• The dwelling should blend with landform, existing trees, buildings, slopes and other natural features rather than sitting as a prominent feature on a skyline or on an elevated site.
• Access should use an existing lane or entrance where possible, avoiding a long new driveway scarring a hillside.
• Boundaries should be reinforced with native hedging and trees rather than suburban walls and gates.
• The design should reflect local rural building forms, with simple massing and restrained materials.

Suburban detailing in an open field is the most common design refusal reason. Pillared gateways, extensive hard landscaping, a wide sweeping drive and a heavily glazed front elevation all read as urban.

Non-mains sewerage is a further gate. Where a private treatment system is proposed, the policy requires the applicant to demonstrate that the discharge can be accommodated, which usually means a percolation test and a discharge consent from the department. Do that test early, because a failed percolation test can end a project.

What to submit with a countryside application

Assemble the pack around the test you are relying on: a site location plan and block plan, existing and proposed elevations, a site section showing levels, a landscape and planting plan, photographs from public viewpoints, the farm business evidence or cluster analysis, and the percolation test results with a drainage layout.

Add a short planning statement that names the CTY policy you rely on and takes the tests one by one. Officers in Northern Ireland are used to reading applications framed that way, and an application that does not address the tests directly invites a refusal on policy grounds alone.

PlanScope's drafting is grounded in English national policy and English local plans, so a Northern Ireland application needs the reviewer to check the CTY policies and the Local Development Plan themselves. You can still use the report types to structure the supporting documents, and pricing covers editing and versioning the drafts before your agent reviews them. To see the document set a rural site is likely to need, start from the PlanScope home page.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. This is general guidance, not legal advice; check the position with your council's planning service or a qualified professional before relying on it.