The exposure declaration in a telecommunications submission
A telecommunications prior approval fails without the exposure declaration, and succeeds or fails on siting and appearance. Here is what the declaration covers and what the submission needs alongside it.
Every prior approval application for telecommunications apparatus in England has to be accompanied by a declaration that the installation, when operational, will be in full compliance with the radio frequency public exposure guidelines of the International Commission on Non-Ionizing Radiation Protection. That is not optional and it is not a matter for negotiation. It is a condition attached to the permitted development right in Part 16 of Schedule 2 to the General Permitted Development Order 2015, and an application without it is incomplete.
The declaration also sets the boundary of what the local planning authority may consider. Where it has been provided, national policy is clear that the authority should not question the need for the network or seek to impose its own health safeguards.
What the declaration confirms
The declaration is a statement by the operator about the design of the installation. It confirms that the apparatus and its installation are designed to be in full compliance with the relevant public exposure guidelines, taking account of the cumulative effect of other apparatus operating at the same site.
That last point is the one reviewers should check. A single antenna on a rooftop already carrying several other operators' equipment has to be assessed against the combined exposure, not its own emissions in isolation. Where a site is shared, the declaration should say so.
What the declaration does not do is provide site-specific measurement data. It is a design statement. Requests for measured field survey results at prior approval stage go beyond what the regime requires, and operators will say so.
Where the requirement comes from
The obligation sits in the conditions attached to the permitted development right rather than in a separate regime. Part 16 grants rights to electronic communications code operators for a range of development, subject to dimension and location limits and, for defined categories, a requirement to apply to the authority for prior approval of siting and appearance.
The exposure guidelines themselves are produced by an independent international body and are adopted in national policy as the appropriate standard. National planning policy on supporting high quality communications makes the declaration the mechanism by which health considerations are addressed, and directs authorities away from revisiting them.
The dimension limits in Part 16, including permitted mast heights and the size of apparatus on buildings, have been amended more than once in recent years. Read the current text of the Order on legislation.gov.uk rather than a summary, because an installation that exceeded the class a few years ago may fall within it now, and the reverse is also possible.
Prior approval under Part 16
Where prior approval is required, the matters reserved to the authority are the siting and the appearance of the development. Not the need for it, not the technology, and not the health effects where the declaration has been supplied.
The application should be accompanied by:
- A written description of the proposed development, with dimensions
- Plans showing the location, the site boundary and the apparatus
- Elevations and details of the apparatus, including any cabinets and ancillary equipment
- The exposure declaration
- Evidence of the siting alternatives and site sharing options considered
- Photographs or photomontages from representative viewpoints
- Evidence of notification to owners and occupiers, and any site notice
The determination period is 56 days from the date the application is received. If the authority does not notify a decision within that period, the development may proceed in accordance with the details submitted, which is why authorities treat these applications as priority casework and why applicants should keep a dated record of submission.
Site sharing and alternatives evidence
The strongest submissions do not simply assert that the chosen site is the only option. They set out the search.
Explain the coverage or capacity objective in plain terms, list the candidate sites considered within the search area, and give the reason each was discounted: no landlord agreement, insufficient height, unacceptable visual effect, access or power constraints, or technical shortfall. Then explain why sharing an existing structure was not possible, or where it is proposed, how the combined installation has been designed.
Authorities and objectors both focus on this section, and an evidenced alternatives narrative removes the most common reason for refusal on siting. The industry code of practice on mobile network development sets expectations for this engagement, including early discussion with the authority and with the operators of sensitive sites.
Design and screening of apparatus
Appearance is a legitimate matter for the authority and it is where design effort pays.
Slimline monopoles read better than lattice towers in most settings. Colour choice should respond to the backdrop rather than defaulting to grey. Cabinets grouped and screened with planting or a low enclosure attract fewer objections than a scattered compound. On buildings, setting antennas back behind a parapet, or within a shroud matched to the building's material, makes the difference between a comment and an objection.
Where the site sits within or adjoining a designated landscape, a Townscape and Visual Impact Assessment or, in open countryside, a Landscape and Visual Impact Assessment should accompany the submission. The viewpoint methodology matters as much as the conclusion, as photomontage methodology in a landscape and visual assessment sets out.
Consultation on sensitive sites
Where apparatus is proposed close to a school, college or other sensitive location, the industry code of practice expects the operator to engage with the body responsible before the application is made, and to record that engagement.
This is engagement, not a veto. The exposure declaration remains the mechanism by which health considerations are addressed, and an authority cannot refuse on health grounds where it has been provided. What early engagement does is reduce the volume of objection and give the case officer something to point to in the report.
Record the engagement in the submission: who was contacted, when, what was said and what changed as a result. An unevidenced statement that consultation took place is worth very little at committee.
The same applies to parish and town councils in rural areas, where a mast proposal is often the largest planning matter of the year. A short briefing note sent before submission, explaining the coverage problem and the sites discounted, tends to produce a measured response rather than a form objection. It also gives the case officer a document to quote.
Assembling the submission pack
- Confirm whether the proposal falls within Part 16 at all, against the current dimension and location limits.
- Confirm whether prior approval is required, or whether notification alone suffices.
- Prepare the siting and appearance case, with the alternatives and sharing evidence.
- Obtain the exposure declaration in the operator's standard form, covering cumulative exposure where the site is shared.
- Prepare viewpoint photography and photomontages before the design is fixed, not after.
- Complete owner and occupier notification and the site notice, and keep dated evidence.
- Diary the 56 day period from the date of receipt.
A Telecommunications Compliance draft can structure the siting and appearance statement and the alternatives narrative, with the operator supplying the declaration itself.
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 local planning authority or a qualified professional before relying on it.
Frequently asked questions
What is the exposure declaration?
A statement by the electronic communications code operator that the apparatus and its installation are designed to be in full compliance with the radio frequency public exposure guidelines of the International Commission on Non-Ionizing Radiation Protection, taking account of cumulative exposure where a site is shared. It is a condition of the permitted development right in Part 16.
Can a council refuse a mast on health grounds?
Not where the exposure declaration has been provided. National policy directs authorities not to question the need for the network or to set their own health safeguards, and the matters reserved on a prior approval application are siting and appearance. Health objections are routinely received and routinely cannot be given weight.
Do I have to submit measured field survey results?
No. The declaration is a design statement rather than a measurement exercise, so requests for site-specific field survey data at prior approval stage go beyond what the regime requires. Where a site carries several operators' equipment, the declaration should confirm that cumulative exposure has been taken into account.
How long does prior approval take?
Fifty-six days from the date the application is received. If the authority does not notify a decision within that period, the development may proceed in accordance with the details submitted. Keep dated evidence of submission, of owner and occupier notification and of the site notice, because the period runs from receipt.
What alternatives evidence should accompany the application?
The coverage or capacity objective, the candidate sites considered within the search area, the reason each was discounted, and why sharing an existing structure was not possible or how a shared installation has been designed. This section removes the most common reason for refusal on siting grounds.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.