The decision whether to hire a legal secretary or deploy AI to handle the same function is, at its core, a financial one. The duties are comparable in scope; the costs are very different in structure. This article sets out the honest numbers for both options — salary benchmarks, hidden costs, and realistic estimates of what AI time recording and correspondence automation actually recover — so that UK law firms can make an informed comparison.

The True Cost of a Human Legal Secretary

The headline salary for a legal secretary in the UK varies by region and experience. According to the 2024 Legal Sector Salary Survey published by the Law Society Gazette and Robert Half Legal:

London: £32,000–£46,000 (median £38,000)
South East outside London: £27,000–£38,000 (median £31,500)
Midlands and North: £23,000–£33,000 (median £27,500)
Scotland: £24,000–£34,000 (median £28,000)

These are gross salary figures. The true employment cost is considerably higher.

Employer Costs Beyond Salary

Employer National Insurance contributions are payable at 13.8% on earnings above the secondary threshold (£9,100 per year in 2025/26). On a salary of £30,000, this adds approximately £2,885 per year.

Employer pension contributions under auto-enrolment are a minimum of 3% on qualifying earnings (between £6,240 and £50,270 in 2025/26). On a salary of £30,000, this adds approximately £713 per year — though many firms contribute 5% or more as part of a competitive benefits package.

Holiday pay — a legal secretary is entitled to a minimum of 28 days annual leave including bank holidays. For a secretary earning £30,000, this represents approximately £3,231 in paid leave cost per year.

Sick leave — UK employees are entitled to Statutory Sick Pay (£116.75 per week in 2025/26). Beyond SSP, most employers continue to pay full salary during illness. Across the workforce, average sick leave is around 4.7 days per employee per year; in office-based roles this costs an average of £630 per employee annually. Cover arrangements during illness add further cost.

Recruitment — legal secretary recruitment costs vary from £1,500 to £5,000+ via a recruiter (typically charging 10–15% of starting salary), plus the cost of the hiring process: management time, assessments, and onboarding. The legal sector has above-average staff turnover rates — approximately 18% per year — meaning a firm with a single legal secretary will on average recruit every five to six years.

Training and development — CPD, software training, and professional development for a legal secretary typically costs £500–£1,500 per year.

IT and equipment — laptop or desktop, SRA-compliant software licences, desk space. In an office context, the allocated desk and equipment cost per employee is typically £2,000–£4,000 per year.

Total Annual Cost of a Legal Secretary

Bringing these together, the all-in annual cost of a legal secretary earning £30,000 in salary (a conservative mid-market figure) is approximately:

Cost item	Annual amount
Gross salary	£30,000
Employer NI	£2,885
Employer pension (3%)	£713
Holiday cost (28 days)	£3,231
Sick leave and cover	£800
Training and development	£750
IT and equipment	£3,000
Total annual cost	£41,379

For a London-based secretary at the median salary of £38,000, the equivalent all-in figure is approximately £54,000 per year.

These costs are fixed regardless of how busy the secretary is. A legal secretary who is 70% productive for two months of the year (as can happen in quieter periods) still costs the firm the full annual amount.

The Cost of AI Legal Secretary Software

AI legal secretary software is typically priced on a per-fee-earner per-month basis. At the entry level of the UK market, pricing starts at around £49 per fee earner per month, rising to £120–£200 for enterprise platforms with deeper integrations and more extensive customisation.

For a firm with five fee earners using an AI platform at £49 per fee earner per month:

Cost item	Annual amount
Software subscription (5 × £49 × 12)	£2,940
Implementation and setup	£0–£1,000 (typically one-off)
Ongoing IT support	Minimal (SaaS)
Total annual cost (year 1)	£3,940
Ongoing annual cost (year 2+)	£2,940

Even at the higher end of AI platform pricing — £120 per fee earner per month for a firm of five — the annual cost is £7,200, a fraction of the cost of a single human secretary.

The Capability Comparison

Cost comparison is only meaningful if the capabilities are equivalent. Where does AI match, exceed, or fall short of a human legal secretary?

Where AI Matches or Exceeds

Correspondence drafting — AI drafts routine letters and emails with speed and consistency that matches a competent secretary. Volume capacity is unlimited: an AI platform handles 200 emails in the same time as 2.

Time recording — AI is more reliable than a human secretary for capturing billable time, because it monitors work as it happens rather than relying on dictated time records from the fee earner. This directly addresses a revenue leakage problem that a human secretary shares with the fee earner.

AML and compliance workflows — automated client due diligence, PEP screening, and matter-opening compliance checks are handled consistently and without the risk of human omission.

Availability — AI operates continuously. There is no holiday cover problem, no sick leave, no 5pm shutdown. Correspondence drafted at 7pm before a morning deadline is handled.

Consistency — AI produces consistent output quality regardless of workload pressure, Monday morning inertia, or interpersonal dynamics.

Where a Human Secretary Adds Value

Complex client interactions — a distressed client, a complaint, a sensitive conversation that requires empathy and professional discretion. A human secretary who knows the client and the context provides value that AI cannot.

Physical tasks — printing, post, court bundle preparation, delivering documents. AI does not have hands.

Novel situations — when something falls genuinely outside established patterns and requires a judgment call, an experienced secretary’s contextual knowledge is valuable.

Relationship and institutional knowledge — a long-serving secretary often carries firm-specific knowledge that is hard to document: who to call at the Land Registry for a specific enquiry, which counsel’s clerk to approach for a fast turnaround, the client who always wants to be called rather than emailed.

For most firms, these distinctively human capabilities represent a minority of the total task volume. The majority of a legal secretary’s day — typing letters, filing correspondence, recording time, managing diaries, chasing documents — is susceptible to automation.

The Hybrid Model

The most cost-effective outcome for many firms is not a choice between AI and human but a combination: one legal secretary supported by AI handling a workload that previously required two or three secretaries, or a single AI platform replacing a secretary role that has fallen vacant and does not need to be refilled.

In the hybrid model, the human secretary handles complex, relationship-sensitive, and physical tasks while the AI handles volume correspondence, time recording, and compliance administration. The human secretary becomes more effective — freed from the most repetitive elements of the role — and the firm reduces total staff cost while maintaining or improving service quality.

Firms that have moved to this model typically find that one secretary supported by AI can comfortably serve eight to twelve fee earners, compared with the traditional ratio of one secretary to three or four fee earners.

Revenue Recovery: The Other Side of the Equation

The cost comparison above focuses on direct costs. It omits the revenue side: what does AI actually recover in billable time that would otherwise be lost?

As discussed in the automated time recording analysis, solicitors typically lose 15–30% of billable time through inadequate manual recording. For a five-fee-earner firm where each solicitor bills at £190 per hour against a 1,200-hour target:

Conservative time leakage at 15%: 180 hours per fee earner per year
Revenue at risk: £34,200 per fee earner per year
Total across five fee earners: £171,000 per year

If AI time recording recovers two-thirds of this leakage, the revenue recovery is £114,000 per year. Against a software cost of £2,940 per year, the ROI is not marginal — it is transformative.

A human secretary, however diligent, cannot solve the time leakage problem because the root cause is not secretarial — it is the gap between when work happens and when it is recorded.

The Hiring Risk That Does Not Apply to AI

One final consideration: the employment relationship. Hiring a legal secretary creates obligations under the Employment Rights Act 1996, the Equality Act 2010, and associated legislation. Dismissal procedures, performance management, maternity and paternity leave, and the cost of an employment tribunal claim in a wrongful dismissal scenario are all risks that do not exist with a software subscription.

In the current UK labour market, legal sector employers are also competing for a limited pool of skilled legal secretaries. Recruitment timelines of two to three months are common; candidates are increasingly selective. The cost and uncertainty of recruitment is itself a significant factor — particularly for smaller firms where a single secretary role vacancy materially affects service capacity.

An AI platform is deployed in days, not months, with no recruitment process, no notice periods, and no employment law exposure.

Obiter is priced from £49 per fee earner per month, making it accessible even for sole practitioners and small firms. If you are looking at the cost of a legal secretary hire and want to see what AI can do first, the 14-day free trial at obiteros.com costs nothing to test.

AI vs Human Legal Secretary: A Cost Comparison for UK Firms