Contractor Guide 2026
Fire & Security Subcontract Work in the UK
Where the contracts come from, what they actually pay, and what you need in place before a main or FM contractor will put you on site.
The short answer
- Typical maintenance day rate
- £180 – £260
- Regional at the lower end, London and the South East at the top.
- Commissioning day rate
- £250 – £350
- The highest-paid subcontract work, and the hardest to staff.
- Public liability expected
- £2m – £5m
- Required before most contractors will let you on site.
- CIS deduction
- 20% registered
- 30% if you are not CIS-registered — registering is worth 10 points of cashflow.
- Approval bodies
- NSI or SSAIB
- Both UKAS-accredited and recognised by insurers and police URN schemes.
- Core fire standard
- BS 5839-1
- Demonstrable competence to the current code is what buyers screen on.
Rates are indicative UK figures for commercial work in 2026 and vary with discipline, accreditation and region. Sources at the end of this guide.
How subcontracting differs from employment
Subcontracting in fire and security is a different game from employment. Instead of one employer, you work for main contractors, FM providers and installers on a job-by-job or rolling-contract basis — carrying your own insurance, tools and accreditations, and billing a day rate rather than drawing a salary.
The reality: the day rates look attractive, but the work goes to contractors who are documented, insured and demonstrably competent to BS 5839-1 before they ever quote. Getting those foundations in place is what turns occasional work into a steady book of repeat clients — and it is why most people who try subcontracting and give up were beaten by paperwork rather than by the engineering.
Where the work comes from
Four main sources, in rough order of how accessible they are to a new subcontractor.
Regional & national installers
Most accessibleInstallers routinely need extra hands for large installs, remedial programmes and commissioning peaks. This is the realistic starting point for a new subcontractor — the relationship is engineer-to-engineer rather than procurement-led, so a capability email can land you on the call list within days.
Tier-1 FM contractors
Highest volumeMitie, ISS, CBRE, OCS and similar hold multi-site maintenance contracts and subcontract fire and security works out to specialists. The onboarding is paperwork-heavy, but the prize is rolling planned-maintenance work rather than one-off jobs — the closest thing to predictable income in subcontracting.
Alarm receiving centres & national accounts
Coverage-dependentCompanies holding national retail, banking or leisure contracts subcontract regional call-out and maintenance coverage. They are buying geography and response time as much as skill, so being the nearest competent engineer to a cluster of sites is genuine leverage.
Main contractors on new-build & fit-out
Best paid, most demandingConstruction main contractors package fire detection and security into fit-out works. Rates are strong, but documentation, insurance, site cards and programme discipline are non-negotiable, and payment terms are typically longer than FM work.
What it pays — day rates
Indicative UK rates for 2026. Actual rates vary with discipline, accreditation, region and whether calibrated test equipment is included.
| Work type | Region | Day rate |
|---|---|---|
| Maintenance & remedial | Midlands / North | £180 – £230 |
| Maintenance & remedial | London / South East | £220 – £260 |
| Commissioning & design-related | Nationwide | £250 – £350 |
| Installation (labour only) | Nationwide | £160 – £220 |
Compare against employed salaries in the 2026 FM salary guide before deciding — day rates are gross, and utilisation is what determines whether they beat a salary.
NSI, SSAIB and the standards that matter
Third-party certification is the currency of credibility in this trade, and it is widely misunderstood. You do not need your own approval to subcontract for an approved company — you work under their certification. You need it when you contract directly with end clients, especially where insurers or police URN schemes are involved.
NSI
National Security Inspectorate
UKAS-accredited certification body. Approval is granted per discipline — a company can hold intruder alarm approval without CCTV or fire alarm approval — and at tiers (Silver, Gold) reflecting the depth of the management-system audit.
SSAIB
Security Systems and Alarms Inspection Board
The other UKAS-accredited body covering the same ground. Choosing between NSI and SSAIB is largely historical or preferential — both are recognised by insurers and by police URN (Unique Reference Number) schemes.
The standards your work is judged against
| Standard | Scope |
|---|---|
| BS 5839-1 | Fire detection and alarm systems in non-domestic premises |
| EN 54 | Fire detection and fire alarm system components |
| EN 50131 | Intruder and hold-up alarm systems |
| EN 50132 | CCTV surveillance systems |
What you need before you quote
Have these in place before you approach contractors — they are exactly what a pre-qualification questionnaire asks for.
Demonstrable competence to the current BS 5839-1 code is the first thing buyers screen on for fire alarm work. A recognised Level 3 qualification is the clearest proof of it.
Public liability insurance
£2m–£5m cover is the usual expectation before a contractor will let you on site. Professional indemnity is commonly required on top where you design or commission, because you are certifying a life-safety system.
CIS registration
For construction-linked work, registering under the Construction Industry Scheme drops your deduction from 30% to 20% and signals you are set up to subcontract properly.
ECS / CSCS card
The ECS (JIB) card for electrotechnical work, or CSCS for general construction sites, is required for site access on most managed contracts.
Calibrated test equipment
Subcontractors are expected to arrive fully equipped. On commissioning work, calibration certificates are routinely checked — an out-of-date certificate can void your sign-off.
CIS, tax and getting paid
Most fire and security subcontract work that touches construction falls under the Construction Industry Scheme. Under CIS the contractor deducts money from your payments and passes it to HMRC as an advance payment toward your tax and National Insurance — it is not an extra tax, but it does hit your cashflow.
20%
CIS registered
The standard deduction once you are registered with HMRC.
30%
Not registered
The higher rate applied if you have not registered. Pure lost cashflow.
Registering is straightforward and immediately worth 10 percentage points of cashflow, so do it before your first invoice. Keep every deduction statement — that is what you offset against your tax bill at year end.
How to find and win contracts
Get your paperwork contract-ready first
Before you approach anyoneInsurances, qualifications, calibration certificates, health-and-safety policy and references in one folder. This is what a pre-qualification questionnaire asks for, and being able to return one in a day rather than a week is a genuine competitive advantage.
Tip: Keep a one-page capability summary — accreditations, coverage area, disciplines, day rate — you can attach to a first email.
Approach regional installers directly
Weeks 1–4The most accessible entry point. A short, specific capability email to installers within your travel radius gets you on their call list faster than waiting for a job advert to appear.
Tip: Name the systems you know — Advanced, Gent, Notifier, Texecom — rather than saying "all types". Specificity reads as competence.
Register with FM contractors as an approved subcontractor
Months 1–3Ask tier-1 FM providers about their approved-subcontractor process. It is slower and more bureaucratic, but it is where rolling planned-maintenance work comes from rather than one-off call-outs.
Tip: Ask which framework or region has a gap. Contractors onboard fastest where they currently cannot cover a patch.
Build toward third-party approval
Year 1–2NSI or SSAIB approval opens doors that stay shut otherwise, particularly on insurer-driven and police-URN work. It is a step up in cost and audit burden, so time it once you have steady work to justify it.
Tip: Approval is granted per discipline — start with the one that matches most of your existing work.
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Contract red flags
Four things that separate a contract worth taking from one that costs you money.
No written scope or order number
Verbal instructions are how variations turn into unpaid work. Get the scope, the rate and a PO reference in writing before you start — including who pays for return visits.
Payment terms beyond 60 days
Common on main-contractor fit-out and survivable if you plan for it, but fatal if you have not. Know the terms before you commit your diary, not after.
Being asked to certify someone else’s install
Signing off a system you did not install, on a standard you cannot verify, transfers the liability to you. Inspect and report, or decline — do not certify blind.
Rates quoted "including everything"
Clarify what is inside the day rate: travel, parking, congestion charge, materials, out-of-hours uplift, standby. An attractive headline rate can net out below a lower one.
Frequently asked questions — fire & security subcontract work
How do I find fire and security subcontract work in the UK?+
The most reliable routes are approaching regional and national installers directly, registering with tier-1 FM contractors as an approved subcontractor, and monitoring specialist job boards for contract and subcontract listings. Being demonstrably competent to BS 5839-1, insured and CIS-registered before you approach anyone dramatically improves your odds of being taken on.
What day rate can a fire and security subcontractor charge?+
Indicative UK day rates in 2026 run roughly £180–£260 for fire alarm and security maintenance and remedial work, and £250–£350 for commissioning and design-related work, with London and the South East at the upper end. Rates depend on discipline, accreditations, whether calibrated test equipment is included, and the length and certainty of the contract.
Do I need NSI or SSAIB approval to subcontract?+
Not to work as a subcontractor for an already-approved company — you work under their certification. You need your own NSI or SSAIB approval when you contract directly with end clients, particularly where insurers or police URN schemes are involved. Both bodies are UKAS-accredited and equally recognised; approval is granted per discipline, so you can hold it for intruder alarms without holding it for fire or CCTV.
What qualifications do I need to subcontract fire alarm work?+
Demonstrable competence to BS 5839-1 is the core requirement, and a recognised Level 3 qualification is the clearest evidence. For the security side, buyers look for experience with the relevant systems and standards — EN 50131 for intruder, EN 50132 for CCTV — plus ECS or CSCS for site access. Commissioning contracts require the highest level of documented competence.
What insurance does a fire and security subcontractor need?+
Public liability cover of £2m–£5m is the usual minimum before a main or FM contractor will engage you. Professional indemnity is commonly required where you carry out design or commissioning, because you are certifying that a life-safety system meets the standard.
How does CIS tax work for fire and security subcontractors?+
Under the Construction Industry Scheme, contractors deduct money from your payments and pass it to HMRC as advance payments toward your tax and National Insurance. Registered subcontractors have 20% deducted; unregistered subcontractors have 30% deducted. Registering is straightforward and immediately improves your cashflow by 10 percentage points.
How do I get on an approved-contractor list?+
Approved-contractor onboarding usually means completing a pre-qualification questionnaire covering your insurances, accreditations, health-and-safety policy, references and financial standing. Third-party certification and a clean, current documentation trail make approval far quicker — most rejections are administrative rather than technical.
Is subcontracting better paid than employment in fire and security?+
Day rates look higher than an employed salary, but you carry your own insurance, tools, van, holiday, pension and downtime between contracts. Subcontracting tends to pay off once you have steady repeat clients and can keep utilisation high; early on the income is markedly less predictable than a permanent role.
How we compiled this guide
Day rates are compiled from UK contract and subcontract job postings, contractor market reports and recruiter data, cross-checked against the fire and security vacancies listed on this site. Tax, certification and standards information is taken directly from GOV.UK and the relevant certification bodies rather than secondary sources.
Primary sources
- GOV.UK — Construction Industry Scheme (CIS)
- NSI — National Security Inspectorate
- SSAIB — approved company search
- Fire Industry Association (FIA)
Written and maintained by the Commercial Trades Jobs editorial team, who work with UK commercial hard-FM employers and engineers daily. Last reviewed August 2026. Figures are indicative and change — always confirm current prices and requirements with the provider or awarding body before committing. Spotted something out of date? Tell us.
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