Reports needed for a rooftop telecoms installation

A rooftop telecoms installation by an electronic communications code operator is usually dealt with by prior approval under Schedule 2 Part 16 of the General Permitted Development Order 2015, not by a full planning application. The submission the council assesses is short: siting and appearance, supported by an ICNIRP declaration, with heritage evidence where the building or its surroundings are designated.

What the council does not assess is often more surprising to building owners than what it does. Structural loading, roof access and lease terms are all outside the planning decision entirely, and they are the items that most often stop a scheme.

Prior approval under Part 16 and what it covers

Part 16 permits development by or on behalf of an electronic communications code operator for the purposes of the operator's network. That includes antennas on buildings, the equipment cabinets and radio housing that serve them, and the cabling between.

Where prior approval is required, the matters are the siting and the appearance of the development. The authority cannot use the process to refuse on grounds of need, on the identity of the operator, or on the effect of the emissions where the declaration described below has been provided.

The limits within the class control height above the building, the dimensions of antennas and housings, the number of installations, and the position relative to the edge of the roof. Those limits have been amended more than once, so read the current text of Part 16 rather than working from a previous scheme's precedent.

Rights are restricted on article 2(3) land, which covers conservation areas, National Parks, National Landscapes, World Heritage Sites and the Broads. On a listed building the right does not assist you at all, and listed building consent is required for the works in addition to any planning permission.

The ICNIRP declaration and what it does not prove

Part 16 requires a prior approval application for an antenna to be accompanied by a declaration that the equipment and installation is designed to be in full compliance with the public exposure guidelines of the International Commission on Non-Ionizing Radiation Protection.

That declaration is a self-certification by the operator about the design. It is not a measurement of what will be emitted once the site is live, and it is not a health assessment of the local area. National policy has long been that where the declaration is provided, the local planning authority should not seek to determine health safeguards or to question the guidelines themselves.

Be straightforward about this in the submission. Objectors raise health regularly, and a supporting statement that explains what the declaration covers, who issued it and why the authority cannot reopen the guidelines is more useful to the case officer than one that simply attaches the form.

A Telecommunications Compliance document covering the declaration, the network justification and the site selection sequence is the usual vehicle for this material.

Structural loading on the host building

Antennas, mounting steelwork, cable trays and equipment cabinets add dead load and wind load to a roof that was not designed for them. On a flat roof with a ballasted mounting frame the loads concentrate at the frame feet.

None of this is a planning matter, and the council will not ask for it. The building owner should, and the lease or code agreement should require it. Commission a structural appraisal covering the existing roof construction, the added dead and wind loads, the load path to the supporting structure, and any strengthening required, and get it before you sign rather than after. A Structural Survey by a chartered engineer is the right instrument.

Two practical points. Roof waterproofing warranties are frequently invalidated by penetrations or by traffic during installation, so the specification should address reinstatement. And on older buildings the appraisal may need opening up works, which take longer to arrange than the prior approval period.

Visual impact, screening and heritage settings

Appearance is one of the two matters the authority can consider, so it deserves proper evidence rather than a single elevation drawing.

Provide photographs from the streets and public spaces around the building, with the proposed equipment shown accurately in position, at eye level rather than from a drone. Show the setback from the parapet, because an antenna set back from the roof edge disappears from close views in a way that a parapet-mounted one does not. Specify the finish, and match it to the background the equipment will be seen against rather than to the roof it stands on.

Where the building is in a conservation area or within sight of listed buildings, the setting assessment is the heart of the case. A Heritage Statement identifying the significance of the affected assets and assessing the effect of the equipment on that significance is expected, and on a prominent building a Townscape and Visual Impact Assessment with verified views may be proportionate.

Screening works when it is designed as part of the building. Glass-reinforced plastic shrouds detailed as chimneys or plant enclosures can be convincing, or they can look exactly like what they are. The difference is in the proportions and the joint lines.

Access, cabling and plant enclosures

The route from the street to the roof matters more than applicants expect. Cable runs through occupied floors, a riser with capacity, an equipment room or external cabinet at ground or basement level, and safe permanent roof access all have to exist.

On a residential block, cable routes through common parts raise fire stopping questions and, in a higher-risk building, sit within a wider building safety framework. On a commercial building the equipment room takes lettable floorspace, which is a commercial negotiation rather than a planning one.

Show the cabinet and enclosure locations on the submitted plans even where they fall within permitted limits, because a case officer who discovers them later will treat the application as incomplete.

Site sharing and the alternative sites assessment

National policy expects operators to explore sharing existing masts and structures, and to use existing buildings before erecting new structures. The supporting statement should show that sequence honestly: which existing sites were tested, what coverage or capacity gap remains, and why this building was selected.

The assessment carries real weight in designated areas, where the authority is entitled to ask harder questions about whether a less sensitive location would work. A statement that lists three rejected alternatives with one line each reads as a formality. One that gives the coverage reason for each rejection reads as evidence.

Pre-application discussion is worth having on prominent or designated buildings. The prior approval period is short, and a scheme that needs redesign mid-determination usually has to be withdrawn and resubmitted.

Where a full application is required instead

Four situations take the scheme outside Part 16. Development exceeding the class limits in height, size or number. Installation by someone who is not a code operator, such as a private network on a business park. A site where an Article 4 direction has removed the right. And works to a listed building, where consent is needed whatever the planning position.

In each of those cases the proposal is assessed against the development plan in the ordinary way, and the range of considerations widens to include amenity, design in the round and any local policy on tall structures. Budget for a longer programme and a wider evidence base, and browse the full set of report types on PlanScope to scope it.

This is general guidance rather than legal advice. Check the current text of Part 16 and the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. For specialist technical reports, qualified professional input may be required.