Darlington telecom appeal fails over alternative sites

The Darlington telecom appeal has been dismissed after an Inspector found that a 20-metre monopole would harm the street scene and nearby residents’ outlook, while the evidence did not convincingly rule out less intrusive alternative sites.

Appeal 6011909 concerned a grassed verge on Carmel Road North in Cockerton. Cornerstone proposed a slim-line monopole carrying six antennas, two transmission dishes and associated cabinets under Part 16 of the General Permitted Development Order.

In the Darlington telecom appeal, Inspector N Armstrong accepted that there was a genuine network need within the search area and gave substantial weight to improved telecommunications coverage. Even so, the combination of visual harm, residential outlook and weak alternative-site evidence was enough to dismiss the appeal.

Why the Darlington telecom appeal failed

The Darlington telecom appeal site is an open grass verge on the western side of Carmel Road North. Housing at Rowan Court and Hummersknott Avenue lies close by, while the wider street contains lighting columns, signs and low-level street furniture rather than large telecommunications structures.

In the Darlington telecom appeal, the Inspector accepted that the proposed mast was relatively slim compared with some alternatives. That did not overcome its scale. At 20 metres, with antennas adding visual bulk, it would be much taller and more substantial than the existing street furniture and surrounding buildings.

The open setting made that difference more noticeable. The mast would be highly visible from Carmel Road North, Hummersknott Avenue and parts of Abbey Road, creating what the Inspector regarded as an intrusive and incongruous feature in a location where mature trees do not currently provide strong screening.

The associated cabinets would benefit from permitted development rights in their own right, but the Inspector considered them as part of the overall visual effect because they were unlikely to be installed without the mast.

The development plan was not the statutory prior-approval test

One of the most useful points in the decision is procedural. Darlington Borough Council referred to Policy IN7 of its local plan, which seeks to minimise the visual impact of telecommunications infrastructure.

In the Darlington telecom appeal, the Inspector made clear that Part 16 does not require a prior-approval decision to be made against the development plan in the normal way. Under Schedule 2, Part 16, Class A, the authority is assessing siting and appearance, taking representations into account.

Local plan and national policy can still be material where they are relevant to those issues, but they do not rewrite the statutory scope of the prior-approval exercise. That distinction matters for both applicants and councils because prior approval is not simply a compressed full planning application.

Planning Geek’s Part 16 telecommunications guide explains the permitted development right and the prior-approval process in more detail.

Residential outlook added a separate source of harm

The nearest homes at Rowan Court have side windows facing across the open grassed area towards the appeal site. Existing lighting columns and signs have a limited effect on those views because of their scale.

The proposed mast would be different. Its height, bulk and close relationship with the nearest clear-glazed windows meant it would become a dominant feature in an outlook that is currently relatively open.

The Inspector did not find the same level of harm for every nearby property. Some views would be oblique and the cabinets themselves would not create unacceptable outlook effects. But the effect on the nearest Rowan Court properties was enough to amount to material harm.

This is worth noting because telecoms decisions are often framed primarily as street-scene disputes. Here, the effect on residents’ outlook was a distinct main issue rather than simply part of the general visual assessment.

Alternative-site evidence became decisive

Cornerstone had identified a search area based on network coverage and considered 18 alternatives. The Inspector accepted that a new installation was needed somewhere within that search area.

The problem was not the existence of a search exercise. It was whether some of the alternatives had been discounted convincingly enough once harm at the appeal site had been identified.

One option, D11 on the opposite side of the road, had been rejected because of underground services. Utility information showed a low-pressure gas main and BT ducting, but the Inspector was not given compelling evidence that a mast could not be positioned elsewhere on that verge using suitable construction methods.

That location also had adjacent trees and was further from the nearest residential properties. It therefore had at least the potential to be less intrusive than the appeal site.

The Inspector also referred to an existing telecoms installation further south on Carmel Road South, where a mast sits closer to mature trees and uses a design intended to integrate with its setting. The evidence did not establish that a comparable approach could not work elsewhere within the search area.

The ‘least worst option’ argument did not rescue the scheme

The appellant described the appeal site as the “least worst option” and referred to the Planning Inspectorate’s internal Inspector Training Manual.

The Inspector pointed out that the training manual is internal guidance, not government policy. More importantly, the appeal evidence had not demonstrated that all potentially less harmful alternatives were genuinely unavailable.

That left a gap in the case. Once the Inspector had found harm to character, appearance and residential outlook, the network need could only outweigh that harm if the siting evidence showed that a better option was not realistically available.

On the evidence submitted, that hurdle was not cleared.

Network benefits still received substantial weight

The decision should not be read as hostility to telecommunications infrastructure. The Inspector expressly recognised national policy support for expanding and upgrading networks and gave substantial weight to the benefits of coverage, capacity, reliability and resilience.

The appellant had also submitted evidence on industry requirements, digital strategy and operational need. Those matters counted strongly in favour of the proposal.

But Part 16 does not mean any site within a coverage gap must be accepted. The statutory right remains subject to siting and appearance controls. Where harm is identified, the quality of the alternative-site analysis becomes especially important.

Health concerns were not a reason for refusal

Local objections also raised health concerns. The appellant supplied an ICNIRP certificate confirming that the installation had been designed to comply with the recognised guidelines on non-ionising radiation.

The Inspector followed national policy and did not apply a different health standard. No sufficiently authoritative evidence had been submitted to justify departing from the ICNIRP position.

This part of the decision is conventional but still useful. Planning arguments about telecoms should distinguish health concerns from the planning issues that decision-makers are actually entitled to determine where the ICNIRP requirements are met.

Planning Geek view

The Darlington telecom appeal is a strong reminder that an alternatives table is only as good as the evidence behind each rejection. Listing 18 options sounds thorough, but the number of alternatives is not the point if a potentially less harmful location has been discounted without enough technical proof.

For operators, the lesson is to anticipate the question that follows a finding of visual harm: why exactly can the mast not go somewhere else? Utilities, land ownership, coverage, construction constraints and tree relationships may all matter, but each needs enough evidence to withstand scrutiny.

For councils, the decision also reinforces the statutory boundaries of Part 16. Development plan policies may help explain the siting and appearance issues, but they are not the legal starting point for prior approval.

The full decision can be checked on appeal decision and on the Planning Inspectorate appeal service. Planning Geek’s appeals guidance covers the wider appeal process.