What security clearance do I need to work on an MOD site?

The security clearance required depends on the specific MOD establishment and the nature of the work. BPSS (Baseline Personnel Security Standard) is the minimum for any contractor working on MOD estates. It covers identity verification, right to work in the UK, three years of employment history, and a basic criminal record check. BPSS can usually be completed in 2 to 4 weeks. SC (Security Check) clearance is required for roles that involve access to SECRET information or regular, uncontrolled access to secure areas. SC involves a more comprehensive background check going back 10 years and is required for most MOD maintenance contractors on sensitive sites. SC can take 3 to 6 months to complete. DV (Developed Vetting) is the highest level of clearance and is required for roles involving access to TOP SECRET information or very sensitive facilities. DV involves a detailed investigation of the candidate's personal, financial, and professional background, including interviews. DV clearance can take 6 to 12 months and is only used for a small proportion of defence site contractor roles. Your employer will sponsor and manage the vetting process — you cannot initiate defence security vetting independently.

What is Def Stan 61-12 and how does it differ from BS 7671?

Def Stan 61-12 (Design Requirements for Electrical Installations in Defence Establishments) is the MOD's technical standard for electrical installation design on defence estates. It supplements and in some cases modifies the requirements of BS 7671:2018. Key differences and additions include: resilience requirements — certain MOD facilities require higher levels of supply reliability than standard commercial installations. Def Stan 61-12 may specify dual-supply arrangements, automatic changeover, or UPS backup for critical systems beyond what BS 7671 would normally require; electromagnetic compatibility (EMC) — military operations can be sensitive to electromagnetic interference. Def Stan 61-12 addresses EMC requirements for electrical installations that might not be covered in BS 7671; specific cable types — certain defence applications require cables rated for specific military environments (for example, cables suitable for use in vehicle installations or in extreme temperature environments); protection requirements — physical protection of cables and equipment in areas subject to security threats or blast risk may require armoured containment or other measures not normally considered in commercial installations. In practice, when working on MOD sites, the project specification will reference the applicable Def Stan standards alongside BS 7671, and the site engineer will provide guidance on where the standards diverge.

What is SQEP and how do I demonstrate it?

SQEP (Suitably Qualified and Experienced Person) is the MOD's framework for defining the competency required for technical work on defence estates. Unlike some specialist sectors (where CompEx or SHEA Nuclear provide a specific qualification to demonstrate competence), SQEP is a principle-based framework rather than a specific certificate. To demonstrate SQEP for electrical work on MOD sites, you would typically need to show: a relevant electrical qualification (C&G 2365 or equivalent, plus C&G 2382 18th Edition); a current ECS card at an appropriate grade for your role; experience appropriate to the scope of work (the MOD or its contractors will specify experience requirements in the tender or work package documents); relevant additional qualifications for specialist systems (for example, C&G 2391 for testing, fire alarm qualifications, emergency lighting qualifications); and membership of a relevant professional body (IET, ECA, NICEIC) where appropriate. On MOD sites, SQEP is enforced by the contractor's project management and by DIO (Defence Infrastructure Organisation) oversight. If you cannot demonstrate SQEP for a specific task, you must work under the supervision of someone who can.

How do MOD electrical projects differ from standard commercial projects?

MOD electrical projects share much in common with other large commercial and industrial projects but have several distinctive characteristics: security constraints — working on MOD sites involves security passes, restricted area designations, and in some cases restrictions on mobile phones and electronic devices in certain buildings; change control — any modification to an MOD electrical installation typically requires a formal engineering change request and approval process before work begins; documentation requirements — as-built drawings, test records, and certificate of conformity documentation must be produced and retained in the MOD's document management system; explosive and blast considerations — on some MOD sites (weapons ranges, explosive storage areas, armament facilities), electrical installations must be designed to appropriate blast and ignition source standards. This may require ATEX-type considerations even if the area is not formally classified under DSEAR; specific materials requirements — certain cable types, equipment finishes, or materials may be mandated by the project specification for reasons of durability, chemical resistance, or operational compatibility; and heritage buildings — many MOD sites include listed buildings or buildings with unusual construction that presents additional challenges for electrical installation.

How do I get work on MOD estates as a small electrical contractor?

For small contractors, direct access to MOD work is limited — most MOD estate maintenance and construction contracts are let to Tier 1 contractors through DIO (Defence Infrastructure Organisation) frameworks such as the Defence Estate Optimisation (DEO) programme and the Accommodation Modernisation Initiative (AMI). Small contractors typically access MOD work as sub-contractors to these Tier 1 contractors. To get into the supply chain, approach the electrical sub-contracting departments of the major MOD Tier 1 contractors — Amey Defence Services, VIVO Defence Services (formerly Sodexo and Ventia), AECOM, and Landmarc Support Services are among the largest. Ensure your company can provide evidence of appropriate insurance (public liability, employer's liability, professional indemnity), quality management (ISO 9001 or similar), and that your key personnel hold or can obtain the appropriate security clearances. Some smaller MOD projects are procured directly by base engineers on local purchase orders — building relationships with DIO project managers at specific sites can open these opportunities.

What types of electrical work are most common on MOD estates?

MOD estates encompass a huge variety of property types and therefore a wide range of electrical work: Barracks and accommodation — upgrading electrical installations in service accommodation, including heating systems, lighting upgrades to LED, EV charging infrastructure, and general rewires. This is the highest-volume category. Airfield and runway lighting — specialist work including constant current airfield lighting systems (CCR), taxiway lights, approach lighting systems. Requires specific airfield lighting qualifications. Naval bases — dockyard electrical installations including shore power connections for vessels, large mechanical handling equipment power, workshop and hangar electrical systems. Weapons ranges — electrical systems for range control, target systems, and safety lighting at live firing ranges. Requires specific access clearances and awareness of range safety rules. Technical and research facilities — specialist electrical installations at defence research establishments (DSTL, AWE). The most technically demanding and best-paid category.

What are the pay rates for MOD electrical work?

Pay rates on MOD estates vary significantly by site, clearance level, and the nature of the work: General maintenance electrician on barracks and accommodation (BPSS required): £35–£45/hr. Electrical contracts on operational sites requiring SC clearance: £45–£60/hr. Specialist electrical work (airfield lighting, HV, ATEX areas): £55–£75/hr. AWE Aldermaston and Burghfield (nuclear weapons — equivalent to commercial nuclear rates): £65–£90+/hr. DSTL Porton Down and other research establishments: £55–£80/hr. Electrical project engineer on DIO framework contracts: £60–£90+/hr. Emergency call-out on MOD operational sites typically attracts a double-time or 2.5x rate, which can be highly lucrative on busy operational bases. The security clearance overhead (time and administration) justifies the premium over equivalent commercial work.

SPECIALIST GUIDE

MOD Defence Site Electrical Work: Security Clearance, Def Stan, and Career Guide

MOD estate electrical work pays £45–£90+/hr and provides long-term contract stability. This guide covers BPSS, SC, and DV clearance, Def Stan 61-12, SQEP requirements, DIO frameworks, and how to access the defence estate supply chain.

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16 min readUpdated 2026-05-18Andrew Moore, Founder of Elec-Mate

Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.

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Key Takeaways

1MOD (Ministry of Defence) sites operate under strict security controls. All contractors must undergo security vetting as a minimum at BPSS (Baseline Personnel Security Standard) level. Many roles require SC (Security Check) clearance; the most sensitive sites and roles require DV (Developed Vetting).
2Electrical installations on MOD sites must comply with Def Stan 61-12 (Design Requirements for Electrical Installations in Defence Establishments) in addition to BS 7671:2018+A4:2026. Def Stan 61-12 provides additional requirements for resilience, EMC, and specific military applications.
3SQEP (Suitably Qualified and Experienced Person) is the MOD's framework for defining the competency required for various types of technical work on defence estates. Electricians working on MOD sites must be able to demonstrate they meet the SQEP criteria for their specific scope of work.
4Work on MOD estates is procured primarily through DIO (Defence Infrastructure Organisation) frameworks, pre-qualification questionnaires (PQQs), and through the major Tier 1 contractors who hold MOD estate maintenance and construction contracts.
5Pay rates for electrical work on MOD estates range from £45 to £80 per hour depending on the clearance level required, the nature of the work, and the site. AWE (Aldermaston and Burghfield) and other nuclear-adjacent MOD sites command rates comparable to nuclear sites.

01 · Specialist Guide

MOD Defence Site Electrical Work: The Complete Guide

The Ministry of Defence (MOD) is one of the largest landowners in the UK, with hundreds of sites ranging from barracks and airfields to naval bases, weapons ranges, and research establishments. Together they represent a vast and largely stable source of electrical contracting work — the MOD cannot offshore its site maintenance.

Working on MOD estates requires security clearance, compliance with the Def Stan 61-12 electrical standard (alongside BS 7671), and demonstration of the SQEP (Suitably Qualified and Experienced Person) competency framework. The pay premium over equivalent commercial work reflects these additional requirements.

This guide covers the security vetting process (BPSS, SC, and DV), the Def Stan 61-12 standard, SQEP requirements, how to get work on MOD estates, the types of electrical work available, and the pay rates you can expect.

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02 · Specialist Guide

Security Clearance: BPSS, SC, and DV

Security clearance on MOD estates is managed through the UK Security Vetting (UKSV) system. The three levels most relevant to electrical contractors are:

BPSS

Baseline Personnel Security Standard. Minimum for all MOD estate contractors. Identity, right to work, 3 years employment history, criminal record check. Typically 2–4 weeks. Required for access to open areas of most MOD sites.

SC

Security Check. Required for regular, uncontrolled access to secure areas. 10-year background check. Takes 3–6 months. Required for most work on operational military establishments and technical facilities.

DV

Developed Vetting. Highest level of clearance. Required for access to TOP SECRET information or the most sensitive facilities. Comprehensive personal investigation and interview. Takes 6–12 months. Small proportion of contractor roles.

Your employer or the Tier 1 contractor managing the MOD contract will sponsor and submit your vetting application. You cannot apply independently. Ensure you have a clean criminal record and a clear, documented employment history — gaps require explanation.

03 · Specialist Guide

Def Stan 61-12: Electrical Installations in Defence Establishments

Def Stan 61-12 (Design Requirements for Electrical Installations in Defence Establishments) is the MOD's supplementary electrical standard that applies alongside BS 7671 on defence estates. Key areas where Def Stan 61-12 adds to or modifies BS 7671:

Supply resilience — certain MOD facilities require automatic changeover between supplies or UPS backup for critical systems beyond normal BS 7671 requirements. Def Stan 61-12 defines the resilience categories for different facility types.
Electromagnetic compatibility — military communications and electronic warfare equipment can be sensitive to electromagnetic interference. Def Stan 61-12 addresses screening, cable segregation, and bonding requirements to minimise EMC problems.
Specific cable types — the standard may mandate particular cable constructions for durability, chemical resistance, or military compatibility that go beyond BS 7671 requirements.
Documentation — as-built records, test certificates, and change records must be maintained in the MOD's document management system. Def Stan 61-12 specifies the documentation requirements.

04 · Specialist Guide

SQEP: Suitably Qualified and Experienced Person

SQEP is the MOD's competency framework for technical work on defence estates. Unlike CompEx or SHEA Nuclear (which are specific qualifications), SQEP is a principle — the MOD requires that all technical work is carried out by persons who are suitably qualified and experienced for the specific scope of work.

For electricians, demonstrating SQEP typically requires:

Electrical qualification: C&G 2365 Level 3 (or equivalent NVQ), C&G 2382 (18th Edition Wiring Regulations), and C&G 2391 (Inspection and Testing) as a minimum.
ECS card: Current ECS Gold card at the appropriate grade. This is the baseline competency indicator for MOD estate contractors.
Relevant experience: Experience appropriate to the type of work — for example, HV experience for HV work, ATEX experience for hazardous area work, airfield lighting experience for airfield projects.
Specialist qualifications: Where applicable — CompEx for ATEX areas, HV authorisation training, airfield lighting certification.

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05 · Specialist Guide

Getting Work on MOD Estates: Frameworks and PQQs

MOD estate electrical work is procured through DIO (Defence Infrastructure Organisation) frameworks and through the prime contractors who hold long-term estate maintenance contracts. The main procurement routes are:

DIO frameworks (Tier 1): VIVO Defence Services (hard FM for most UK army/RAF sites), Amey Defence Services, Landmarc Support Services. These are long-term PFI or FM contracts. Electrical contractors typically sub-contract from these primes.
Pre-qualification questionnaires (PQQs): MOD construction projects above a value threshold are procured through formal tendering. The first stage is often a PQQ assessing the contractor's financial standing, quality systems (ISO 9001), health and safety record, and relevant experience.
Contracts Finder and Find a Tender: MOD procurement opportunities above £25,000 are published on the UK Government's Contracts Finder website. Monitoring this for electrical and M&E opportunities at MOD sites is a practical route for smaller contractors.

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06 · Specialist Guide

Types of MOD Electrical Work

MOD estates include a wide variety of building and infrastructure types:

Common Work Types

• Barracks and accommodation rewires and upgrades
• LED lighting upgrades across estates
• EV charger installation on military estates
• Fire alarm and emergency lighting maintenance
• Workshop and hangar electrical installations
• HV substation maintenance (with appropriate clearance)

Specialist Work Types

• Airfield and runway lighting systems
• Naval dockyard shore power connections
• Weapons range electrical systems
• AWE nuclear weapons facilities (highest clearance)
• DSTL research facility specialist installations
• Communications infrastructure power

07 · Specialist Guide

Pay Rates on MOD Estates

Pay rates reflect the security clearance overhead, the Def Stan compliance requirements, and the specialist nature of specific sites:

General maintenance electrician (BPSS required): £35–£45/hr on barracks, accommodation, and standard estate sites.
Operational site electrician (SC required): £45–£60/hr on active military installations.
Specialist work (HV, ATEX, airfield): £55–£75/hr reflecting specialist qualifications.
AWE and research establishments (DV required): £65–£90+/hr, comparable to commercial nuclear sites.

Frequently Asked Questions About MOD Defence Site Electrical Work

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MOD Defence Site Electrical Work: Security Clearance, Def Stan, and Career Guide

Key Takeaways

MOD Defence Site Electrical Work: The Complete Guide

Get the BS 7671 A4:2026 Cheat Sheet — free

Security Clearance: BPSS, SC, and DV

BPSS

SC

DV

Def Stan 61-12: Electrical Installations in Defence Establishments

SQEP: Suitably Qualified and Experienced Person

Try Elec-Mate free for 7 days

Getting Work on MOD Estates: Frameworks and PQQs

Professional electrical certificates for MOD site work

Types of MOD Electrical Work

Common Work Types

Specialist Work Types

Pay Rates on MOD Estates

Frequently Asked Questions About MOD Defence Site Electrical Work

What security clearance do I need to work on an MOD site?

What is Def Stan 61-12 and how does it differ from BS 7671?

What is SQEP and how do I demonstrate it?

How do MOD electrical projects differ from standard commercial projects?

How do I get work on MOD estates as a small electrical contractor?

What types of electrical work are most common on MOD estates?

What are the pay rates for MOD electrical work?

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