The landscape in one paragraph
As a UK-incorporated operator you deal with two regulators and one international process. Ofcom is your gateway to everything spectrum: it is the UK’s administration at the ITU, it submits and manages your international satellite filing, and it licenses any earth stations you operate on UK soil. The Civil Aviation Authority (CAA) licenses the satellite activity itself under the Space Industry Act 2018 — a separate authorisation you cannot launch without, which includes its own radio-frequency question set. And the ITU process — filing, coordination, notification, bringing into use — is what converts your paperwork into internationally recognised rights. The single most important planning fact: spectrum runs on longer lead times than most other parts of your programme, so it must start at mission concept, not at launch campaign.
Step 1 — Fix your frequency plan at mission-design stage (T-minus 24+ months)
Before any application, decide what your satellite actually needs from the radio spectrum, because everything downstream depends on it. At minimum you need TT&C — telemetry, tracking and command — to control the spacecraft. If your mission carries a payload that transmits (Earth-observation downlink, communications service, IoT collection), that needs its own frequencies, and possibly feeder links too.
The typical choices for a first small satellite: UHF or S-band for TT&C (S-band around 2025–2110 MHz up and 2200–2290 MHz down is the workhorse), X-band around 8025–8400 MHz for Earth-observation data downlink, and Ku/Ka-bands if you are building a communications service. Each band carries a different coordination burden — congested bands mean longer, harder coordination — so the frequency plan is a schedule decision as much as an engineering one. If you plan to use a commercial ground-station network (AWS, KSAT, Leaf Space and peers), talk to them now: their existing licensed sites constrain which bands are practical, and using their infrastructure can spare you several licences of your own.
One route to rule out early for a commercial venture: the amateur satellite bands coordinated through the IARU. They are free and fast, which tempts every CubeSat founder, but they are only legitimately available for genuinely non-commercial missions, and regulators and the amateur community have hardened against commercial missions masquerading as amateur ones. If you are a company with a business model, plan for commercial allocations from the start.
Step 2 — Open pre-application conversations with Ofcom (T-minus 20–24 months)
Ofcom’s satellite team is approachable and explicitly supports new operators through the process — use that. Before submitting anything, share your mission concept, frequency plan and timeline. This conversation will tell you three things you cannot easily learn otherwise: whether your chosen bands raise obvious coordination or UK-allocation problems (some bands in the UK Frequency Allocation Table are managed by the Ministry of Defence, and Ofcom consults the MOD on filings before submission to the ITU); what filing route your system needs; and realistic processing timescales. At the same meeting, ask about the earth-station licensing you will need for any UK ground segment.
Two structural notes for this stage. Ofcom files for companies registered in the UK, the Overseas Territories, the Channel Islands and the Isle of Man, so your UK incorporation gives you the standing you need. And filing through the UK is a choice, not an obligation — operators can and do file through other administrations — but for a first mission the practical advantages of your home regulator, in your language and legal system, usually outweigh any procedural attractions elsewhere.
Step 3 — Prepare and submit the satellite filing application (T-minus 18–20 months)
The formal instrument is Ofcom’s application form (OfW587) submitted under its Procedures for the Management of Satellite Filings — read the current version of that document cover to cover; a new edition was published in March 2026. Your application describes the satellite network technically: orbits, frequencies, bandwidths, power levels, antenna characteristics, service areas — the parameters the ITU’s Appendix 4 requires. Expect to demonstrate that the project is real: Ofcom assesses applications before agreeing to file, and as the notifying administration it takes on international responsibility for your network, so it wants evidence of a credible operator, not a speculative land-grab.
Budget for two sets of charges: Ofcom’s own fees for satellite filings work (published in its Notice of Satellite Filing Charges), and the ITU’s cost-recovery charges for processing the filing, which vary enormously with complexity — a simple non-GSO filing is modest; a complex multi-band constellation filing can run to tens of thousands of Swiss francs. Confirm both against the current schedules.
Once Ofcom is satisfied — and the MOD has been consulted — it submits the filing to the ITU’s Radiocommunication Bureau. The date of receipt at the ITU is your priority date: your place in the queue, and the moment your seven-year bringing-into-use clock starts running.
Step 4 — Work the coordination (T-minus 18 months to launch, and beyond)
For frequencies subject to coordination, the ITU publishes your filing and identifies the earlier-filed networks you must reach agreement with. Ofcom typically makes first contact with the other administrations, after which you as the operator usually negotiate directly with your counterpart operators — adjusting powers, geometries and operational arrangements until they are satisfied. Ofcom then assesses whether you have made reasonable efforts and whether your system is unlikely to cause or suffer interference before it notifies the network for entry in the Master Register; it can attach conditions to your operation.
Treat coordination as a managed workstream with an owner, a tracker and a budget, not as correspondence to be answered when it arrives. For a small mission in sensibly chosen bands it may be light; in congested bands it is the pacing item of the whole regulatory programme. This is also where most first-time operators need external help — the negotiations are technical, relationship-driven and conducted against counterparties who have done it hundreds of times.
Step 5 — In parallel: the CAA orbital operator licence (T-minus 12–18 months)
Spectrum rights let you transmit; they do not let you operate a satellite. That requires an orbital operator licence from the CAA under the Space Industry Act 2018 — a wholly separate application through the CAA’s portal, with question sets covering the technical mission, radio frequency and spectrum, finances, and national security. Expect scrutiny of your orbital-debris mitigation plan (including disposal at end of life), your insurance (third-party liability cover is required, conventionally at the £60 million level for standard missions, with government indemnity above it), your cyber and security arrangements, and your organisational competence to operate the spacecraft.
Start this six to twelve months before you need it at the very latest, and note the interaction with spectrum: the CAA’s RF question set expects your Ofcom/ITU story to be in order, so sequencing the filing first keeps the operator-licence application clean. If your launch is procured abroad (almost certain for a first mission), the launch itself is licensed by the launch state; your CAA licence covers your operation of the satellite. Where different entities procure the launch and operate the spacecraft, each needs its own licence.
Step 6 — License the ground segment (T-minus 6–12 months)
Every transmitting earth station on UK territory needs an Ofcom licence — a Permanent Earth Station licence for a fixed TT&C or downlink site, with frequency coordination against terrestrial users baked into the process. If you use a commercial ground-station-as-a-service network instead, the stations abroad are licensed by their host countries under the provider’s arrangements, and your regulatory burden shrinks accordingly — one of the strongest practical arguments for not building your own dishes for a first mission. Don’t forget the receive side and any transportable or test equipment used during AIT and early operations.
Step 7 — Launch, bring into use, and notify (launch to T-plus 90 days)
After launch and commissioning, your frequency assignments must be brought into use — for non-GSO systems, in essence, a satellite capable of using the filed frequencies operating in the notified orbit — and confirmed to the ITU through Ofcom within the regulatory deadlines. This step converts your queue position into a recorded, protected right in the Master International Frequency Register; miss the seven-year deadline and the filing lapses. If you are flying a constellation rather than a single spacecraft, the post-2019 milestone regime also applies: ten per cent of the filed constellation deployed within two years of the end of the bringing-into-use period, half within five, all of it within seven, or the filing is cut down to what you actually flew.
Step 8 — Market access, if you serve customers abroad
The steps above give you the right to operate your system; they do not give you the right to sell service in any particular country. If your business serves users outside the UK — a comms constellation, an IoT service, direct data delivery — each target market needs its own authorisations from its own regulator. Sequence these against your commercial plan, longest-lead countries first, and treat the first three markets as part of the founding regulatory programme rather than a later add-on.
Ongoing obligations
The regulatory work does not end at launch. Keep Ofcom informed of changes to your details and system; monitor the ITU’s fortnightly BR IFIC circulars for new filings that could affect your network and comment through Ofcom’s system where they do; maintain your operator-licence conditions, insurance and debris commitments; and run coordination as a permanent, low-level function — new entrants will file behind you, and your early priority date then becomes an asset someone else must negotiate around.
The realistic timeline and budget
Working backwards from launch: frequency plan fixed at mission design; Ofcom pre-application around two years out; filing submitted eighteen to twenty months out; coordination running continuously thereafter; CAA application in the window twelve to eighteen months out; earth-station licences six to twelve months out; bringing-into-use confirmation within the deadline after launch. For budget, plan in orders of magnitude: thousands of pounds for Ofcom’s filing fees; potentially tens of thousands of francs for ITU cost recovery on anything complex; CAA application fees per the current scheme of charges; insurance premiums as a recurring operational cost; and — realistically — some external regulatory support at the filing and coordination stages, which for a first mission is money that buys schedule certainty.
The five mistakes that cost first-time operators the most
Starting the spectrum work after the satellite design is frozen, and discovering the chosen bands carry an unworkable coordination burden. Assuming the amateur bands are available to a commercial mission. Treating the CAA licence and the Ofcom filing as one process and starting the second one late. Building UK ground stations that need their own licences when a commercial network would have carried the traffic with none of the burden. And treating the priority date casually — filing “when the design settles” rather than as early as the Procedures allow, then spending the rest of the programme at the back of a queue that a three-month head start would have avoided.