By the Calibrate Recruitment team. We have spent nearly two decades placing bids, marketing and support staff into UK architecture and built environment practices, including AJ100 firms, on permanent, contract and freelance terms. This guide draws on live placement experience across all three models, cross-checked against current UK rules and rate data.
TL;DR: Which hiring model should you use?
For a built environment practice, the right hiring model depends on whether the need is permanent, temporary or project-based. Hire permanent when the workload is ongoing and you want someone embedded in your studio, your brand and your client relationships for the long term. Use a fixed-term contract when you need to cover a defined gap such as maternity leave, a funded project or a busy bid season, usually for three to twelve months. Use a freelance day-rate specialist when the need is urgent, short or specialist, for example a single major tender, a rebrand or a two-week cover for a departing coordinator. Permanent gives you continuity and lower long-run cost. Contract and freelance give you speed and flexibility, at a higher day rate and, since 6 April 2026, under updated IR35 rules that decide who is responsible for a contractor’s tax status.
If you are resourcing a bid or marketing peak and are not sure which route fits, this guide breaks down each model by cost, speed, risk and control, with a simple decision framework at the end.
What is the difference between permanent, contract and freelance hiring?
The three models differ in who employs the person, how long they stay, and how they are paid.
A permanent hire is an employee on your payroll with no fixed end date. You pay a salary, holiday, pension and employer National Insurance, and you carry the full employment relationship, including notice, sick pay and development.
A fixed-term contract hire is also usually an employee, but on your payroll for a defined period with an agreed end date. They receive broadly the same rights as permanent staff while employed. Many built environment practices use fixed-term contracts to cover maternity or paternity leave, a funded workstream, or a known busy period.
A freelance or day-rate contractor is self-employed or works through their own limited company (a personal service company, or PSC) or an umbrella company. You pay a day rate rather than a salary, you carry no employer on-costs directly, and the arrangement ends when the work does. Freelancers typically move between clients and are engaged for specialist or short-term work.
A quick note on temp workers. When you engage a temporary worker through an agency, the agency employs and pays them and invoices you. Under the Agency Workers Regulations 2010, agency temps become entitled to equal basic pay and conditions after a 12-week qualifying period, which is worth planning for on longer assignments.
Permanent vs contract vs freelance at a glance
Here is how the three models compare across the factors that usually decide the call for a bids or marketing role in a built environment practice.
| Factor | Permanent | Fixed-term contract | Freelance / day rate |
|---|---|---|---|
| Typical length | Ongoing, no end date | 3 to 12 months | Days to a few months |
| Who employs them | You | You | Themselves, PSC or umbrella |
| How you pay | Salary plus on-costs | Salary plus on-costs | Day rate, invoiced |
| Speed to start | Slowest | Medium | Fastest |
| Best for | Ongoing core workload | Defined gaps and cover | Urgent, short or specialist work |
| Continuity | Highest | Medium | Lowest |
| Flexibility to scale down | Lowest | Medium | Highest |
| Long-run cost | Lowest | Medium | Highest per day |
| IR35 to consider | No | No, they are your employee | Yes, if via a PSC |
When should you hire a permanent bid or marketing coordinator?
Hire permanent when the work is not going away. If your practice consistently runs live bids, maintains a website and social presence, produces award submissions and needs someone who knows your projects and partners, that is a permanent role, not a series of contracts.
Permanent hiring wins on three things. It gives you continuity, because the person builds real knowledge of your studio, your tone and your clients. It is the cheapest model over time, because a day rate that looks efficient for two weeks becomes expensive over two years. And it strengthens culture, because embedded staff mentor others and hold institutional memory that freelancers cannot.
The trade-off is speed and commitment. A permanent search takes longer and, once made, is harder to unwind. If you are unsure whether a role is genuinely permanent, that uncertainty is often a sign to start with a contract.
For a fuller view of what a good permanent hire costs, our guide to recruitment agency fees in the UK breaks down how permanent placement fees work and what you are paying for.
When does a fixed-term contract make sense?
A fixed-term contract is the right call when you have a real but time-limited need. The clearest cases are maternity, paternity or long-term sick cover, a specific funded project with a known duration, and a predictable busy period such as a framework renewal or a cluster of major tenders.
Contracts give you a defined start and end, employee-level commitment while the person is with you, and a lower day-equivalent cost than freelance. Because the contractor is your employee, there is no IR35 question to resolve.
The risk is losing a strong contractor to a permanent offer elsewhere partway through. Good contract candidates in bids and marketing are in demand, so build in fair pay and a clear brief to keep them engaged for the full term.
When is freelance the right call?
Choose freelance when the need is urgent, short or highly specialist, and continuity matters less than getting the work done now. Typical built environment examples are a single high-value tender that must go out in three weeks, a rebrand or website launch, InDesign document production for a one-off submission, or immediate cover while you run a permanent search for a departed coordinator.
Freelance wins on speed and flexibility. A specialist can often start within days, deliver, and step away with no ongoing commitment. That flexibility is exactly what you want for spiky, unpredictable workloads.
The trade-off is cost per day and control. Freelance day rates for bid and marketing work commonly run from around 300 to 600 pounds a day depending on seniority, with senior bid specialists higher, according to UK freelance rate data from CalcKit. A genuine freelancer also controls how they deliver, so you are buying an outcome, not managing an employee. If you find yourself directing a day-rate contractor like a member of staff, set hours and no right to substitute, you may have an IR35 problem, which is the next question to resolve.
How does IR35 affect contract and freelance hiring in the built environment?
IR35, also called the off-payroll working rules, is HMRC legislation that decides whether a contractor working through their own limited company should be taxed as an employee. If a contractor takes direction from one client, works set hours and cannot send a substitute, HMRC may view them as inside IR35, meaning PAYE tax and National Insurance apply. A genuinely independent contractor delivering a defined project is more likely to be outside IR35.
Two 2026 changes matter for practices engaging freelancers through a PSC.
First, since the private-sector reform, medium and large end clients are responsible for determining a contractor’s IR35 status and, where inside, for operating PAYE. From 6 April 2026 the small-company thresholds rose to 15 million pounds turnover and 7.5 million pounds balance sheet, with the 50-employee test unchanged, according to GOV.UK off-payroll working guidance and this 2026/27 employer guide from PayFit. Around 14,000 companies moved from medium to small, which shifts the status decision back to the contractor’s PSC. If your practice sits under the small thresholds, the responsibility usually rests with the contractor, but you should confirm your status.
Second, from 6 April 2026 new umbrella company rules mean agencies and end clients can become liable for PAYE that an umbrella fails to pay. If you engage day-rate staff through an umbrella, use a compliant provider and keep the paper trail.
None of this makes freelance hiring risky in itself. It simply means the engagement should be structured correctly. A specialist recruiter that places contract and freelance staff every week can help you set the arrangement up cleanly. This is not tax advice, and for a specific engagement you should confirm status with a qualified adviser.
What does each model actually cost?
Compare the total cost, not the headline number, because the models are priced differently.
A permanent hire costs a salary plus employer on-costs, roughly 20 to 30 percent on top once you add National Insurance, pension and benefits, plus a one-off recruitment fee. Spread over years, the cost per day worked is the lowest of the three.
A fixed-term contractor costs a salary and on-costs for the term, with no long-term liability once the contract ends. The cost per day sits between permanent and freelance.
A freelancer costs a day rate with no direct employer on-costs, but the day rate itself carries their tax, pension and downtime, which is why it looks high. As a benchmark, the median coordinator day rate in the UK is around 275 pounds and bid and marketing specialists commonly sit in the 300 to 600 pound range, per ITJobsWatch and CalcKit. For a two-week tender that is efficient. For a two-year need it is not.
The rule of thumb: the shorter and more urgent the need, the more a higher day rate is worth paying. The longer and more continuous the need, the more permanent wins.
How to choose: a simple decision framework
Work through four questions.
Is the workload ongoing with no end in sight? If yes, hire permanent. If no, keep going.
Do you have a defined gap of three months or more, such as cover or a funded project? If yes, a fixed-term contract usually fits. If the gap is shorter or more specialist, keep going.
Is the need urgent, short or a one-off specialist piece? If yes, freelance is likely the best fit, structured with IR35 in mind.
Are you actually unsure whether the role is permanent? If yes, start with a contract and convert to permanent if the workload proves durable. That protects you from committing to a salary you may not need, while keeping the option open.
If you are still weighing it up, the type of recruiter you use matters as much as the model. Our comparison of specialist versus generalist recruitment for the built environment explains why sector focus shortens time to hire across all three models. And if churn is the real reason you keep reaching for contractors, our piece on why practices lose great marketing coordinators is worth a read before you hire again.
Talk to a specialist across all three models
Most practices do not need to pick one model forever. The best resourcing plans mix them: a permanent core, contract cover for known gaps, and freelance specialists for peaks. The skill is matching the model to the need, role by role.
At Calibrate Recruitment we place bids, marketing and support staff into architecture and built environment practices across the UK on permanent, contract and freelance terms. If you are resourcing a bid or marketing peak, covering a gap, or building a core team, talk to us about hiring built environment support staff and we will help you choose the model that fits and fill it with the right person.
Frequently asked questions
What is the difference between contract and freelance work?
A contractor is usually your employee for a fixed period on your payroll, with employee rights while the contract runs. A freelancer is self-employed or works through their own limited company or an umbrella, is paid a day rate rather than a salary, and carries no employee status with you. Contract suits defined gaps of several months; freelance suits urgent, short or specialist work.
Is it cheaper to hire permanent or freelance staff?
Permanent is almost always cheaper over the long run because a salary plus on-costs works out to a lower cost per day than a freelance day rate. Freelance is more cost-effective only for short, urgent or specialist needs where you would otherwise leave a permanent seat underused. Compare total cost over the real length of the need, not the headline figure.
Does IR35 apply when hiring a freelance bid or marketing coordinator?
IR35 applies when the freelancer works through their own limited company (a PSC). It decides whether they are taxed as an employee based on how the work is really carried out. Whether your practice or the contractor is responsible for the status decision depends on your company size, and the small-company thresholds rose on 6 April 2026. If you engage day-rate staff through an umbrella, new 2026 rules can make the agency or end client liable for unpaid PAYE, so use a compliant provider.
How long does a fixed-term contract usually last in a built environment practice?
Most run from three to twelve months, matched to the gap being covered, such as maternity leave, a funded project or a busy bid season. Contracts can be extended, and strong contractors are often converted to permanent if the workload proves ongoing.
Can you convert a contract or freelance hire to permanent?
Yes, and it is common. Starting on a contract lets both sides test the fit before committing. If the workload proves durable and the person is right, converting to permanent gives you continuity. A specialist recruiter can structure the arrangement so conversion is straightforward and fairly costed.
