Telecoms mast or rooftop antenna: the Part 16 route

Telecoms mast planning permission is usually not planning permission at all. Part 16 of Schedule 2 to the Town and Country Planning (General Permitted Development) (England) Order 2015 grants permitted development rights to electronic communications code operators for masts, antennas, cabinets and associated equipment, subject to conditions and to a prior approval application on siting and appearance. The local planning authority has 56 days to determine that application, and if it fails to do so within the period the development may proceed.

Two consequences follow. The council cannot refuse on the principle of the installation, and it cannot refuse on health grounds where the operator supplies the required declaration. What it can do is direct where the mast goes and what it looks like.

What Part 16 permits and what needs prior approval

Part 16 covers ground-based masts, antennas on buildings and other structures, equipment cabinets, poles, and the small cell apparatus operators use to infill coverage. Height limits, cabinet volumes and separation rules are written into the class, and they were relaxed by amendment in 2022 for ground-based masts and for antennas on existing structures.

The limits differ between ordinary land and Article 2(3) land, which means conservation areas, National Landscapes, National Parks, the Broads and World Heritage Sites. On that land the permitted heights and dimensions are tighter, some categories fall away entirely, and a full planning application becomes the only route.

Because the Order has been amended repeatedly, do not work from a printout. Read the current consolidated version of the 2015 Order on legislation.gov.uk before you fix the design, and record the version date in your submission. Getting a dimension wrong turns a 56 day prior approval into an enforcement problem.

Where prior approval is required, the operator applies to the council with a description of the proposed development, a plan showing the site, and the fee. The council then decides whether it needs to approve details of siting and appearance, and if so, whether it approves them.

Siting and appearance are the only matters in play

This is the point most objectors and some officers miss. On a Part 16 prior approval the council is not deciding whether the site should have a mast. It is deciding two things: where on the land the apparatus should stand, and what it should look like.

That narrows the argument usefully. Landscape and townscape impact, the relationship to nearby buildings, the effect on a listed building's setting, the colour and finish of the shroud, whether the cabinets can sit behind a wall rather than on the footway, the possibility of sharing an existing structure instead of erecting a new one: all of that is siting and appearance. Traffic generation, land values, the operator's commercial case and perceived health risk are not.

An officer report that refuses on any ground outside siting and appearance is vulnerable on appeal, and appeals against Part 16 refusals are decided by the Planning Inspectorate in the usual way.

The ICNIRP declaration and health objections

Every prior approval application for mast development must be accompanied by a declaration that the equipment, in combination with other installations at the site, will operate within the public exposure guidelines published by the International Commission on Non-Ionizing Radiation Protection. National policy is explicit that authorities should not set their own health safeguards and should not question the health effects of an installation that meets those guidelines.

That does not stop the objections arriving. It means the officer cannot give them weight, and it is worth saying so in the covering statement so the recommendation is written correctly the first time. Set out the declaration, state the standard it is made against, and note where the operator's compliance evidence sits.

Where the network operator's radio frequency evidence needs setting out formally, a Telecommunications Compliance document draws the exposure declaration, the site inventory and the design together. Councils normally expect this material to be prepared or checked by an engineer competent in radio frequency exposure, and professional review is strongly advised.

Protected land, conservation areas and listed buildings

Article 2(3) land changes the calculation. Beyond the tighter dimensional limits, the council will look hard at the visual relationship with the designated area, and the duty under section 66 of the Planning (Listed Buildings and Conservation Areas) Act 1990 applies to any effect on the setting of a listed building.

Practical responses that tend to work: move the mast behind a mature tree line or a building rather than onto the skyline, choose a slimline monopole over a lattice tower, use a matt finish in a colour tested against the backdrop rather than a default grey, bury or screen the cabinets, and share an existing structure such as a lighting column, a chimney or an existing mast where the radio plan allows.

Where the setting of a designated heritage asset is engaged, a short Heritage Statement that identifies the asset, describes its significance and assesses the effect of the apparatus is worth more than a paragraph of assertion. The same discipline applies to any prominent structure in open countryside, which is why visual impact arguments for masts and for floodlit sports courts tend to run along the same lines.

Rooftop installations and cabinet clutter

Rooftop schemes fail on clutter more often than on height. A parapet-mounted array on a flat roof is usually invisible from the street. The same array set forward of the parapet, with cable trays, brackets and a run of cabinets on the roof, reads as an accretion from three streets away.

Set the equipment back from the roof edge, use the parapet or a screen of the same material as the building, group cabinets in one enclosure, run cables inside the building where the landlord will allow it, and show a roof plan with sightlines from the nearest public vantage points. Photomontages from two or three agreed viewpoints answer most appearance objections before they are made.

On residential blocks and mixed-use buildings, the structural check on the host roof matters as much as the visual one, and the landlord's engineer will usually want it in writing.

Pre-application consultation

Government and industry expect operators to engage before applying, and the agreed industry code of practice on mobile network development in England sets out what that looks like: early contact with the council, notification of the site, and specific engagement where a mast is proposed close to a school or college.

Do it properly. A parish council that first hears about a mast when the site notice goes up will generate 60 objections. The same body, consulted eight weeks earlier and offered a choice between two locations, will often accept the one further from the village hall.

Record the consultation in the submission: who was contacted, when, what was said, and what changed in the design as a result. A Design and Access Statement is not required for a prior approval, but a short design note covering site selection, alternatives considered and the appearance response does the same job and gives the officer something to quote.

How refusals on siting are usually argued

Refusals cluster around a handful of reasons: the mast is on the skyline when a position 30 metres back would not be, an alternative site or an existing structure was available and was not properly assessed, the cabinets take up footway width, or the finish and design were not tailored to the location.

The answer to each is evidence prepared in advance. Set out the search area and the sites rejected with the radio reason for each rejection. Show the sharing options tested. Provide sections and viewpoint images rather than a single plan. Offer a condition on colour and finish rather than leaving it open.

And watch the clock. The 56 day period runs from a valid application, so an incomplete submission that has to be resubmitted costs a full cycle.

Enter your postcode on PlanScope to see which supporting documents an installation on a constrained site is likely to need.

This is general guidance, not legal advice. Check 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.