For some BMS engineers, contracting offers exactly what they want from their career: higher earning potential, greater independence and the opportunity to move between different projects and environments. For others, the stability, development and benefits attached to permanent employment continue to make considerably more sense.
As BMS contractor day rates remain strong and more engineers consider setting up Ltd Companies, the comparison is becoming increasingly relevant.
So, is it better to work as a BMS contractor or permanent engineer in 2026? The answer depends on more than the day rate.
BMS Contractor Day Rates vs Permanent Salaries
The attraction of contracting usually begins with the numbers.
Using broad UK market figures, a BMS contractor charging approximately £400 per day could generate around 40% more gross income than a permanent BMS engineer earning £55,000 per year, even after allowing for periods between contracts.
That difference is significant enough to explain why contracting continues to attract experienced engineers. However, comparing a permanent BMS salary directly with contractor revenue only provides part of the picture.
A permanent employee receives paid annual leave and sick leave, while many BMS employers also provide company vehicles or allowances, pension contributions, healthcare benefits and funded technical training.
A contractor is generally responsible for funding those costs independently.
Insurance, accountancy, pension contributions, training and periods without work all need to be considered before the true financial difference becomes clear.
The earning potential associated with BMS contracting can still be substantial, but the calculation is considerably more complicated than comparing a £55,000 salary with a £400 day rate.
Why Do BMS Businesses Use Contractors?
The financial comparison raises another question. If contractors typically cost businesses more, why does demand for them remain so strong?
For many BMS businesses, permanent employment remains the preferred long-term model. Developing permanent teams allows technical knowledge to remain within the organisation, gives businesses greater continuity across projects and makes investment in training and development easier to retain.
The difficulty is availability.
Experienced BMS engineers remain in short supply, while project requirements do not disappear because a permanent vacancy has not been filled. Commissioning deadlines still need to be met. Data centres still need to become operational. Building upgrades still need to progress, and clients still expect projects to be delivered according to schedule.
When the required permanent engineer cannot be found quickly enough, contractors provide businesses with access to experienced technical capability when it is needed. In those circumstances, the contractor premium becomes part of a wider commercial calculation. Paying £400 or more per day may appear expensive in isolation, but delaying a major project can cost considerably more.
This helps explain why demand for BMS contractors has remained resilient even as day rates have increased.
How Long Are BMS Contracts?
There is a perception that BMS contracting automatically means moving between short assignments with regular periods of uncertainty between projects. But that is not always the case.
Across the market, BMS contracts lasting six to twelve months are providing an alternative for engineers who want greater earning potential and independence without changing projects every few months. For an engineer who has spent much of their career in permanent employment, this can make contracting a considerably different proposition. A longer contract provides greater visibility over future income while still allowing the engineer to operate independently and benefit from contractor rates.
It does not remove the risks associated with contracting, but it can reduce one of the biggest concerns engineers often raise when considering the move: uncertainty over where the next project will come from.
Is BMS Contracting Worth It?
For engineers comfortable managing that uncertainty, contracting can provide a significant amount of career flexibility. Engineers can choose the projects they take on, experience different working environments and build exposure across multiple clients, BMS systems and applications.
There is also greater control over how a career develops. An engineer may choose to specialise in a particular technical area, move towards major projects or data centres, or select contracts based on location and duration. For experienced engineers with skills that are in high demand, that independence can be extremely valuable.
The financial upside remains an important part of the decision, but for many established BMS contractors, the appeal extends beyond the day rate.
What About IR35?
For UK engineers considering contracting, IR35 status is another important part of the financial calculation. Whether an engagement sits inside or outside IR35 can affect how income is taxed and therefore how attractive a particular day rate is in practice. Contract structure, working arrangements and individual circumstances all matter, so engineers should consider the status of each opportunity rather than comparing day rates alone.
It is one more reason why contractor revenue and permanent salary should not be treated as directly equivalent figures.
Why Do BMS Engineers Choose Permanent Employment?
Permanent employment offers a different form of value. Structured progression, long-term technical development and greater involvement within a business can be difficult to replicate through contracting.
Engineers may have clearer routes into senior engineering, project management or leadership positions. Employers are also more likely to make long-term investments in manufacturer training, professional development and mentoring when an engineer is expected to remain within the organisation.
There is also the value of predictability: A regular salary, paid annual leave, pension contributions, sick pay and a company vehicle or allowance provide financial certainty that becomes increasingly important depending on an individual’s circumstances.
Those benefits do not always appear prominently when comparing permanent BMS salaries with contractor day rates, but they form a meaningful part of the overall employment package.
BMS Contract vs Permanent: Which Is Better?
The comparison between BMS contracting and permanent employment is difficult to reduce to a simple financial calculation.
Contracting can offer considerably greater earning potential, flexibility and independence, but requires engineers to accept greater responsibility for their own financial security, benefits and future workload.
Permanent employment provides greater stability, structured development and long-term progression, although engineers may sacrifice some of the earning potential available through contract work.
Neither route provides the right answer for every engineer.
What is becoming clearer is that the distinction between the two is becoming less rigid. Longer-term contracts are giving permanent engineers another route into contracting, while permanent employers continue to strengthen salaries, benefits and development opportunities to compete for experienced technical talent.
As demand for experienced BMS engineers continues to exceed supply, both models are likely to remain an important part of how the industry builds and maintains its workforce.
VIGO Recruitment specialises exclusively in BMS, Smart Buildings and Energy Optimisation recruitment, combining industry expertise with live market intelligence.