Contract-to-Perm Conversion Windows as a BD Signal: How Recruitment Agencies Win the Next Brief

TL;DR

Every placed contractor carries a calendar. In the UK, the Conduct Regulations 2003 decide how long a transfer fee can be enforced: it lapses once the later of 8 weeks after the worker last worked for the hirer and 14 weeks after they first worked for them has passed [1][2]. The Agency Workers Regulations give the worker equal treatment on pay and basic terms after 12 weeks in the same role with the same hirer [4]. For off-payroll contractors, the client decides IR35 status in most cases, so every contract renewal is also a status decision [5]. Each of these dates is a moment when the client asks one of three questions: do we convert, do we extend, or do we replace? Agencies that know the dates ahead of time can be in the conversation before the client opens a job ad or calls a competitor. The conversion window is therefore a predictable buying signal: it protects fees you have already earned, and it often opens the next brief, either as a backfill for the contractor or as a perm mandate for the role itself. boilr keeps the placement history in the Company Brain and surfaces the window as a Task, so the consultant verifies and sends the right message while the client is still deciding.

The Signal Hiding in Your Own Placement History

Most BD signal content looks outward: funding rounds, executive moves, job-posting velocity. Conversion windows are different. They sit inside your own database, attached to clients you already work with, and they have exact dates. That makes them the most reliable signal a contract desk owns.

• The window is dated, not guessed. Start date, assignment end date, extension history and the hirer's terms of business are all on file. A contractor placed on 6 January with a 6-month assignment has a fee window and an end date you can put in a diary on day one.
• The client has to decide something. At each milestone the hirer chooses between paying a transfer fee, taking an extended hire period, waiting out the quarantine, extending the contract or replacing the contractor [3]. A client making a decision is a client with a live need.
• The need is often invisible to the market. A client converting its own contractor does not advertise the role. A client letting a contract expire does not advertise the backfill until the last week. Neither shows up on a job board in time for outside agencies to win it.
• It is your relationship. You hold the contractor, the hiring manager and the terms. A competitor sees nothing. This is the one signal where the agency with the best memory wins by default.
• Most desks track it in a spreadsheet, if at all. End dates live in the CRM, the fee clause lives in a PDF, and the hiring manager's mood lives in a consultant's head. When that consultant leaves, the window closes unnoticed.

The Clocks That Create a Conversion Window

Four different clocks run on a contractor. They are not the same clock, and they do not always point the same way. The skill is knowing which one matters for which client.

1. The transfer-fee clock (UK)

Regulation 10 of the Conduct of Employment Agencies and Employment Businesses Regulations 2003 does not ban temp-to-perm fees, but it limits when you can enforce them. The fee has to be stated in your terms of business, and you must offer the hirer an extended hire period as an alternative [1][2].

• Relevant period - the fee can be charged only if the hire happens within the later of 8 weeks from the day after the worker last worked for the hirer, or 14 weeks from the day they first worked for the hirer [1].
• Gaps - the GOV.UK guidance states that a gap of more than 42 days between assignments means a later assignment is treated as a first assignment [2].
• Extended hire - the hirer can elect an extended hire period instead of the fee, and after it ends the worker can transfer without charge [1][3].
• Fee level - the amount is a commercial matter and is not capped by the Regulations [2]. An older Personnel Today guide describes 20-25% of first-year salary as a common level [3]; check what your own terms say rather than assuming.

2. The equal-treatment clock (UK)

After 12 calendar weeks in the same role with the same hirer, an agency worker qualifies for equal treatment on pay, working time, rest periods and annual leave. Weeks need not be continuous and can be worked through different agencies [4]. For a client this is a cost step: the contractor may become more expensive relative to a permanent colleague, which is when finance starts asking whether conversion is cheaper.

3. The IR35 and contract-end clock

The off-payroll rules apply contract by contract, and in most cases the client is responsible for determining the worker's employment status [5]. Every extension is a fresh moment to revisit that decision. If a role looks more like employment than a business-to-business engagement, perm is a legitimate option the client may raise itself.

4. The assignment-cliff clock

Many contracts are written for six or twelve months. These are commercial cliffs rather than legal ones, but they behave like signals all the same: budget is reviewed, the project phase ends, and the client decides to renew, convert or stop.

Clock	What starts it	What the client asks	Your move
Transfer fee window (UK)	First day worked for the hirer	Pay the fee, extend, or wait?	Offer the extended hire option and protect the fee
Equal treatment (UK)	12 weeks in the same role	Is the contractor now too expensive?	Raise conversion before finance does
IR35 review	Contract start or extension	Contract or employee?	Offer a perm route and a compliant renewal
Assignment cliff	Planned end date	Renew, convert or replace?	Pitch the backfill or the perm mandate

Germany and DACH: The Same Idea, Different Clocks

If your desk covers DACH, the structure differs but the logic is the same. Under the AÜG, the same temp worker may not be placed with the same hirer for more than 18 consecutive months. Earlier assignments count if the gap is no more than three months [6]. Equal pay applies after nine months of uninterrupted assignment to the same client, unless an industry surcharge collective agreement applies [6].

• 18-month limit - when it is exceeded, the client faces a deemed employment relationship, so the conversion decision is forced rather than optional [10].
• Nine-month equal pay - the cost step mirrors the UK 12-week mark, just later [6].
• Placement fees on takeover - courts have accepted staggered fees that fall with the length of the earlier assignment. The BGH scale cited by a legal commentary runs from 2.0 gross monthly salaries for under three months down to nothing at 12 months or more [7].
• Collective agreements - industry agreements can change the maximum assignment length, so check the client's sector before you diarise a date [6].

The legal detail is not advice, and your terms of business and a qualified adviser decide what applies to your placements. For BD the point is simpler: wherever you recruit, there are dated milestones that force the client to decide.

Three Outcomes, Three BD Plays

A conversion window ends in one of three ways. Each is a different opportunity, and each needs a different message.

Outcome A: The client converts the contractor

• Protect the fee. Send the fee terms and the extended hire option before the relevant period closes. A clear, friendly reminder keeps the relationship intact.
• Open the perm mandate. The role is now permanent and the contractor's old seat, or the team's next seat, may need filling. Ask what else is on the plan.
• Example - a data engineer placed on a 6-month contract is offered perm. You ask the hiring manager whether the contractor's workload now needs a second engineer.

Outcome B: The contract ends and the seat empties

• Pitch the backfill early. Four to six weeks before the end date, ask what the replacement profile looks like. You already know the stack, the team and the rate.
• Offer a hand-over shortlist. Candidates who match the incumbent's profile are a fast, low-effort brief for the client.
• Example - a finance interim finishes a month-end close project. You propose a successor with the same ERP experience ahead of the end date.

Outcome C: The client extends

• Reset the diary. A new end date is a new signal. Log it the same day.
• Check status and terms. If IR35 or the fee clock changed with the extension, confirm that your paperwork matches [5].
• Example - a project is extended by three months. You ask what happens to the second phase and whether it needs additional contractors.

Outcome	Revenue protected	Revenue opened	Best timing
Convert	Transfer fee	Perm mandate for adjacent seats	Before the fee window closes
Expire	Client relationship	Backfill brief	4-6 weeks before end date
Extend	Ongoing margin	Second-phase headcount	At extension sign-off

How to Detect the Window Before the Client Does

1. Capture three dates at placement. First day worked, planned end date and the fee clause from your terms of business. Without these, there is no signal to detect.
2. Add the rule, not just the date. Store whether the window is the 14-week fee period, the 12-week equal-treatment mark or a contract-end cliff, so the right play fires.
3. Trigger at fixed offsets. For example, a prompt at week 8 and week 12 of a UK assignment, and at six weeks before a contract end date. These offsets are a working suggestion, not a legal rule.
4. Layer outside signals. A funding round, a new head of department or a visible job-posting surge at the same client sharpens the timing. A contractor's window plus a hiring signal is a stronger lead than either alone.
5. Log the answer. Whether the client converted, extended or let go, write it back so the next window starts with context.

Manual Tracking vs a Signal-Led Workflow

Step	Manual desk	With boilr
Remember the end date	Spreadsheet or consultant memory	Placement history lives in the Company Brain
Spot the window	Someone notices late	A custom signal for conversion and end-date windows [8]
Combine with market news	Separate tabs, rarely joined	Funding, executive and hiring signals sit beside it
Draft the message	Written from scratch or skipped	A drafted opener in a Task
Send	Whenever time allows	Consultant verifies and sends
Survive a leaver	History walks out the door	Memory stays with the agency

Where boilr Fits (and What Stays Human)

boilr positions itself as an AI sales employee for recruitment, one per consultant, that researches clients, detects signals and drafts outreach for the consultant to verify and send [9]. Here is how that maps to the conversion window.

• Company Brain - the shared agency memory holds the account, the hiring manager, the contract history and what worked last time, owned by the firm rather than one person [9].
• Signals - built-in types include funding rounds, new hires, executive moves and tech migration, and the page states that custom signals let you describe a trigger your desk cares about [8]. A conversion or end-date window is exactly that kind of custom trigger.
• Companies - enrichment and ICP match scores show which clients deserve the extra effort [9].
• Candidates - sourcing for the backfill profile can start while the client is still deciding [9].
• Tasks - the signal, the contact and a suggested opener arrive as finished work to verify and send [8][9].
• Integrations - boilr connects to CRM, calendar and inbox, including Bullhorn and RecruiterFlow, so placement data does not need re-keying [9].

What stays with the consultant:

• Legal judgement - which fee clause applies, whether a status decision changes, and what to say about it.
• The relationship - the call to the hiring manager and the tone of the fee reminder.
• Candidate care - a contractor who is about to be converted still needs honest advice.
• The final send - nothing goes out without a human check.

Want your placement history to warn you before a conversion window closes? Book a demo or start with boilr.

KPIs to Track

KPI	What it shows	How to measure
Windows with a logged date	Coverage of the signal	Active contractors with start, end and fee clause recorded
Contact before window closes	Speed of response	Share of windows where you spoke to the client first
Fees protected	Revenue kept	Conversions that paid a fee or used extended hire
Backfill briefs won	New business	Briefs opened from an expiring contract
Perm mandates opened	Mix shift	Perm briefs traced to a conversion conversation

Common Mistakes

• Chasing the fee as a threat - lead with the client's options, not a demand. The extended hire route is part of the regulation [1].
• Treating every client the same - a client that converts everyone needs a different message from one that always replaces.
• Waiting for the end date - by the last week the replacement is often already chosen.
• Ignoring the contractor - the person on site hears about conversion first and is a source of intelligence, handled with care.
• Forgetting the gap rule - a break of more than 42 days can restart the first-assignment clock [2], so log gaps.
• Assuming German and UK rules match - the 18-month and nine-month marks under the AÜG are not the UK 12-week mark [6].

A 30-Day Rollout Plan

1. Week 1 - audit. List every active contractor and record start date, end date and fee clause.
2. Week 2 - classify. Tag each client by habit: converts, extends or replaces.
3. Week 3 - set triggers. Create offsets for each clock and write one message per outcome.
4. Week 4 - run and log. Contact the first five clients inside their windows and record what they decided.

Frequently Asked Questions

What is a contract-to-perm conversion window?

It is the period when a client can move a contractor onto its own permanent payroll, and when the agency's fee rights and the client's options are defined. In the UK it is shaped by the transfer-fee relevant period of 8 or 14 weeks, whichever ends later [1].

Can a recruitment agency charge a fee when a temp is hired directly?

Yes, if the fee is in your terms of business and you offer the hirer an extended hire period as an alternative. Without that option the fee is unenforceable [2]. Always confirm with your own terms and a legal adviser.

What happens after the 14-week period?

The transfer fee can no longer be charged for a direct hire after the relevant period has ended, which is the later of 8 weeks from the last day worked or 14 weeks from the first day worked [1]. That is why contact before the window closes matters.

Does IR35 affect conversion decisions?

It can. In most cases the client determines the worker's status under the off-payroll rules [5]. A contractor whose engagement looks like employment may be better suited to a permanent contract, which makes status reviews a natural prompt to talk about conversion.

How does the 12-week rule create a BD opening?

After 12 weeks in the same role with the same hirer, the worker qualifies for equal treatment on pay and basic terms [4]. The cost shift often triggers a client conversation about whether conversion makes more sense, and you want to be that conversation.

How early should I approach a client about a backfill?

There is no legal rule. Four to six weeks before a contract ends is a practical starting point, because the client has time to brief you and you have time to prepare a shortlist. Adjust it by client and by role.

Does this work for DACH clients?

The idea does, the dates differ. Under the AÜG the 18-month maximum assignment and the nine-month equal-pay mark create forced decisions [6]. Check the client's sector and any collective agreement first.

Can boilr track conversion windows automatically?

boilr stores agency memory in the Company Brain and supports custom signals you define for your desk [8][9]. The consultant still verifies and sends every message.

Sources

Information sourced from public legal guidance and industry publications as of October 2026. This article is not legal advice.

1. legislation.gov.uk - Conduct of Employment Agencies and Employment Businesses Regulations 2003, regulation 10
2. GOV.UK - Overview of the Conduct Regulations 2003
3. Personnel Today - Employing agency temps as permanent members of staff
4. REC - How does an agency worker qualify for equal treatment
5. GOV.UK - Understanding off-payroll working (IR35)
6. personaldienstleister.de - Das Arbeitnehmerüberlassungsgesetz (AÜG)
7. Kliemt - Zeitarbeitnehmer und Vermittlungsprovision (2018)
8. boilr - Signals (vendor page; timing claims are the vendor's own)
9. boilr - Your AI sales employee for recruitment
10. Haufe - Arbeitnehmerüberlassung: Dauer auf 18 Monate begrenzt