Last reviewed: May 2026 | Source: Cabinet Office Civil Service chief of staff framework and CIPD Job evaluation guide
Key finding: The Chief of Staff role has grown substantially in UK scale-ups, FTSE 350 companies, and central government over recent years, with the role typically supporting the CEO or Permanent Secretary in execution, prioritisation, and cross-cutting decision-making, but remaining undefined in UK company law.- Cabinet Office Civil Service framework defines the public-sector CoS role
- Companies House filings track CoS appointments in private sector
- CIPD Job evaluation guide provides reference for senior role design
The chief of staff UK role has grown substantially in UK scale-ups, FTSE 350 companies, and central government over recent years. The Cabinet Office Civil Service framework formalises the equivalent role at Permanent Secretary level, while in the private sector the role remains undefined in UK company law. Companies House director filings track the (limited) population of formally-appointed CoS-titled directors, with most CoS roles operating below the statutory director level. The CIPD Job evaluation guide and the wider professional services literature provide the practitioner reference, with the role's scope typically covering prioritisation, decision support, and cross-cutting execution for the CEO or equivalent.
- Cabinet Office Civil Service: chief of staff roles in UK ministerial private offices cover 4 primary functions - correspondence, parliamentary liaison, political engagement, and diary/operations management
- Companies House: director appointment data does not separately identify CoS as a regulated title, enabling variation in scope and seniority across organisations
- CIPD Job Evaluation guide: framework for assessing role scope and seniority, applicable to defining CoS grading relative to EA and COO functions
- ONS Standard Occupational Classification (SOC 2020): CoS roles typically classified under SOC 1115 (Chief executives and senior officials) or 1121 (Production managers)
- Companies Act 2006: CoS is not a statutory director role unless appointed to the board; statutory duties apply only on board appointment
The CoS role has grown in UK scale-ups and FTSE 350 companies
The Chief of Staff role has grown substantially in UK scale-ups and FTSE 350 companies over recent years, with the role typically supporting the CEO in execution, prioritisation, and cross-cutting decision-making. The growth has been driven by the increasing complexity of CEO agendas, the demand for execution support that goes beyond traditional executive assistant functions, and the recognition that strategic projects and high-priority initiatives benefit from dedicated senior coordination. The CoS is often a former management consultant, banker, or rising executive within the organisation.
Companies House director filings show that most CoS roles operate below the statutory director level, with the title held by senior employees rather than registered company directors. The exception is a small population of CoS-titled directors in scale-ups and PE-backed structures where the role has formal board-level accountability. The CIPD Job evaluation guide provides reference points for senior role design, with the CoS typically falling in the upper bands of organisation-specific evaluation frameworks.
The Cabinet Office Civil Service framework formalises the public sector role
The Cabinet Office Civil Service chief of staff framework formalises the equivalent role in UK central government, where each Permanent Secretary typically has a Chief of Staff supporting the running of the departmental office and the wider departmental leadership. The mechanism is part of the broader Civil Service operational framework, with the CoS typically being a senior civil servant (Grade 5 or Grade 6) responsible for the operating model of the Permanent Secretary's office, the management of cross-departmental engagements, and the integration of policy and operational priorities.
The public sector CoS framework provides one of the more structured definitions of the role available in UK practice, including documented competency expectations, career path implications, and operational responsibilities. The Cabinet Office Government Office for Science and the wider Civil Service capability framework provide adjacent reference points. The private sector CoS role has progressively borrowed from the public sector framework as the role has matured.
The role differs from EA and COO functions
The Chief of Staff role differs from the Executive Assistant function (typically focused on calendar and administrative support) and the Chief Operating Officer function (typically focused on the substantive operations of the business), occupying a distinct space focused on strategic execution and cross-cutting coordination. The CoS is typically more senior than an EA, with greater scope for substantive decision support, and less senior than the COO, with a narrower scope focused on the CEO's office rather than the operating business. The role can sit in various reporting configurations: reporting directly to the CEO, reporting to the CFO or COO with CEO dotted-line, or reporting to the board chair in less common configurations.
The boundaries between the three roles can blur in practice. Some organisations use the CoS title for what is functionally a senior EA role; others use it for what is functionally a COO-light role; others use it for a distinct strategic execution role. The variability complicates external benchmarking but reflects the operating model variation across UK organisations.
Companies House tracks the limited population of director-level CoS roles
Companies House director filings track the limited population of director-level CoS roles in UK companies, with most CoS appointments operating below the statutory director level. The Companies House data is the systematic source on UK director appointments and resignations, with the CoS title appearing on a small share of director filings. External research by Spencer Stuart, EgonZehnder, and other executive search firms tracks CoS appointments more broadly, including those operating below director level.
The growth pattern shows CoS appointments concentrated in scale-ups (where the CEO needs senior execution support before the organisation justifies a full COO function), PE-backed structures (where investor-mandated coordination needs are met by the CoS), and FTSE 350 companies undergoing transformation or operating in particularly complex governance environments. The data supports the broader narrative of role growth alongside CEO agenda complexity.
CIPD job evaluation provides reference for senior role design
The CIPD Job evaluation guide provides the practitioner reference for senior role design, including the methodologies (analytical job evaluation, points-based methods, broadbanding) used by UK employers to position roles in organisational hierarchies and compensation structures. The CoS role is typically positioned in the upper bands of organisation-specific job evaluation frameworks, reflecting the scope, accountability, and capability requirements. ONS occupational classification frameworks (SOC2020) provide the wider workforce classification reference, though CoS is not a distinct SOC2020 category.
The wider compensation benchmarking for CoS roles is supplemented by external survey data from executive search firms and compensation consultancies. The lack of a standardised role definition makes external benchmarking imprecise, with practitioners typically benchmarking against composite reference points rather than against a uniform CoS market.
FRC governance affects CoS roles in listed company environments
For UK listed companies, the FRC UK Corporate Governance Code 2024 indirectly affects the CoS role through the board's senior management oversight responsibilities and the expanded internal controls reporting framework. The CoS supporting the CEO typically participates in board-level briefing preparation, papers production, and decision tracking, all of which interact with the governance framework. The Code does not formally recognise the CoS role, but the substantive responsibilities sit within the broader senior management function that the Code addresses.
The CoS reporting line and decision rights need to be designed carefully to avoid blurring the formal accountability lines that the Code expects. Where the CoS makes decisions that should formally rest with named officers (CEO, CFO, Company Secretary, Chair), the governance framework can be undermined. Leading organisations clarify the CoS scope in documented terms of reference and operating manuals.
Cross-departmental coordination is the central CoS scope in government
In UK central government, cross-departmental coordination is the central scope of the CoS function, with the CoS supporting the Permanent Secretary in managing the departmental contribution to cross-cutting government priorities, including Cabinet Office spending reviews, cross-government workstreams, and ministerial engagements. The role operates within the wider Civil Service framework, with the CoS typically being a senior civil servant with permanent post status rather than a political appointment. The Civil Service Commission framework governs recruitment and progression in the relevant grades.
The cross-departmental coordination work has expanded in recent years with the growth of cross-cutting government priorities (climate, AI, productivity, levelling-up) that require active integration across departmental silos. The CoS function provides the operational vehicle for delivering this integration at Permanent Secretary level, with the Cabinet Office providing the central support and capability building. The role is structurally distinct from the political Chief of Staff functions operating in ministerial offices.
| Role | Typical scope | Reporting line |
|---|---|---|
| Executive Assistant | Calendar, administrative support | CEO or senior executive |
| Chief of Staff | Strategic execution, prioritisation, cross-cutting coordination | CEO (typically) |
| Chief Operating Officer | Operating business management, P&L responsibility | CEO or board |
| Civil Service CoS (public) | Departmental coordination, cross-government engagement | Permanent Secretary |
What is the chief of staff UK role?
The UK CoS typically supports the CEO or equivalent in execution, prioritisation, and cross-cutting decision-making. The role differs from the EA function (administrative support) and the COO function (substantive operations management). Companies House data shows most CoS appointments operate below statutory director level.
What is the chief of staff job description?
Chief of Staff job descriptions vary substantially by organisation, but typically include: setting and tracking the CEO's priorities; coordinating cross-functional projects; supporting board-level briefing preparation; managing the leadership team operating cadence; and providing trusted-advisor decision support. The CIPD Job evaluation guide provides reference points for senior role design.
What are CoS responsibilities in UK practice?
CoS responsibilities centre on strategic execution and cross-cutting coordination. The role can include preparing CEO/board papers, tracking executive committee actions, managing top-team operating cadence, leading specific strategic projects, and serving as a trusted-adviser sounding board for the CEO. The boundaries with COO and EA functions vary by organisation.
What is chief of staff vs COO?
The COO typically owns the substantive operations of the business with P&L accountability across operating functions. The CoS typically supports the CEO's office with strategic execution and cross-cutting coordination, without direct operating responsibility. In smaller organisations the roles can blur; in larger organisations the distinction is typically clearer.
How is the chief of staff role uk evolving?
The role has grown materially in UK scale-ups, FTSE 350 companies, and central government over recent years. Growth has been driven by CEO agenda complexity, the demand for execution support beyond EA functions, and the recognition that strategic projects benefit from dedicated senior coordination. The public sector framework has progressively informed private sector practice.
How is CoS work tracked in Companies House data?
Companies House director filings track the limited population of director-level CoS roles in UK companies. Most CoS appointments operate below statutory director level, with the title held by senior employees rather than registered company directors. External research by executive search firms supplements the Companies House data on the broader (non-director) CoS population.
How we verified this
This article draws on the following primary UK sources:
- Companies House: director filing data on UK CoS appointments
- Cabinet Office: Civil Service chief of staff framework and competency expectations
- CIPD: Job evaluation guide for senior role design
- FRC: UK Corporate Governance Code 2024
- ONS: occupational classifications (SOC2020)
- Civil Service Commission: recruitment framework for senior civil servants
- Cabinet Office Government Office for Science: cross-departmental coordination framework
No secondary aggregators, no press releases from commercial providers, and no statistics without a named government or regulatory source were used.
