Mast planning permission in a conservation area

Mast planning permission in a conservation area usually means a full application rather than a prior approval, because Part 16 of Schedule 2 to the General Permitted Development Order 2015 is cut back on article 2(3) land. The consequence is a wider assessment: the council can consider design, heritage, landscape, amenity and highway matters, and it can refuse on any of them. Operators who treat a designated area site as a slightly harder prior approval tend to lose it.

The evidence that carries these applications is an honest alternative site assessment and a street-level design that reduces clutter rather than adding to it.

Where Part 16 permitted development stops

Article 2(3) land covers conservation areas, National Landscapes, National Parks, the Broads and World Heritage Sites. Part 16 applies tighter dimensional limits there, and excludes several operations that are permitted elsewhere, so the first task is to compare the proposed apparatus against the class text for designated land rather than against the general limits. An Article 4 direction can remove what remains.

Where the apparatus falls outside the rights, a full application follows, with the fee, the publicity and the determination period that go with it. Listed building consent is a separate consent again where apparatus is attached to a listed structure, and the duty under section 72 of the Planning (Listed Buildings and Conservation Areas) Act 1990 requires special attention to be paid to preserving or enhancing the character or appearance of the conservation area.

Take pre-application advice, and take it with the conservation officer in the room rather than only the case officer. In a designated area the conservation officer's view usually decides the recommendation.

Siting and appearance in a wider assessment

On a prior approval the council is confined to siting and appearance. On a full application those remain the central issues and they sit inside a broader judgement, which changes what the submission has to do.

Siting arguments that work in a conservation area: a position against a backdrop of mature trees or a tall building rather than against open sky, a column set back from a principal frontage, a location away from a view along a street that the conservation area appraisal identifies, and cabinets grouped with existing street furniture instead of forming a new cluster.

Appearance arguments that work: a slim monopole in preference to a lattice structure, antennas shrouded within the column profile, a finish selected against the dominant street colour rather than a default grey, cabinet sizes minimised and heights kept below sightlines, and no new bollards, signage or guardrail unless strictly required. A Design and Access Statement that explains each of those choices against the conservation area appraisal does more work than a longer document that does not mention the appraisal at all.

Alternative site assessment and what it must cover

This is the part most often done badly and most often attacked. A credible assessment has four elements.

1. The coverage or capacity objective, described in technical terms, with the search area shown on a plan.
2. Every candidate site considered, named and located, including existing masts and buildings that could host apparatus.
3. The reason each candidate was rejected, stated specifically: insufficient height, structural capacity, landowner refusal with a date, interference, or inability to meet the objective.
4. Why the chosen site is the least harmful of the available options, judged against the designation.

A table listing three sites with a bare statement that they were not technically feasible is worth nothing, and an officer who has seen a dozen of these will say so in the report. Where a landowner refused, say when and in what terms. Where an existing structure lacked capacity, say what the structural constraint was.

Column design, cabinet siting and street clutter

Conservation areas are judged at eye level. The cabinets, the footway width left beside them and the accumulation of apparatus matter as much as the column height, and often more.

Draw the footway. Show the clear width between the cabinet and the kerb, and show that it meets the accessible width the highway authority requires, because an objection on obstruction is easy to make and hard to answer late. Where the footway is narrow, consider a cabinet set into a boundary wall, a rear-of-footway position on third party land, or a smaller equipment configuration.

Photomontages are worth getting right. Verified views from the street approach in both directions, from the nearest residential windows and from any viewpoint named in the appraisal, with the existing and proposed images at the same focal length. A Townscape and Visual Impact Assessment is proportionate on a prominent site in a sensitive townscape.

Heritage assets and views along streets

Identify every designated asset within the visual envelope, including those well away from the column itself. A column 60 metres from a listed church can affect its setting more than one 20 metres away behind a building.

A Heritage Statement should establish the significance of the conservation area and of any affected asset, describe the contribution the relevant views make to that significance, and then assess the effect of the apparatus on it. Historic England's advice on assessing significance and on setting is the right framework, and the conservation area appraisal is the local evidence. Where harm is identified, say so and quantify it rather than asserting a neutral effect, because an officer who finds unacknowledged harm discounts the whole document.

The conformity declaration and public concern

Applications for mast development have to be accompanied by a declaration of conformity with the public exposure guidelines of the International Commission on Non-Ionizing Radiation Protection. Where that declaration is provided, national policy is that authorities should not question the need for the network or set their own health safeguards.

Health objections will still arrive, in volume. The useful response is not to argue about them. Supply the declaration, state plainly what it covers, and then engage with the points the council can act on. The code of practice for wireless network development in England sets out the engagement expected before submission, including early contact with the authority and with the parish or town council, and operators who have done that arrive with fewer objections and a better officer relationship. A Telecommunications Compliance statement is the document that brings the declaration, the site search and the design justification together.

Conditions to expect

On a designated area approval, expect conditions fixing the colour and finish by reference to a sample or a drawing, requiring cabinet positions and dimensions as approved, requiring any planting or screening to be implemented in the first planting season, restricting additional apparatus without further consent, requiring reinstatement of the footway surface to a specified material, and requiring removal of the apparatus and restoration of the land within a set period after the use ceases.

Check the removal condition against the obligations already in Part 16 and against the lease, because three overlapping removal duties with different triggers create a problem later. A Planning Statement that proposes the condition set is a straightforward way to keep control of the wording.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.

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