Experienced Security Professionals Protecting Your Home & Business

At Main Door Security, we combine experience and technology to keep what matters safe. Our team delivers trusted, efficient, and tailored security services.
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Satisfying Clients

Committed to exceeding your expectations every time.

Who We Are

At Main Door Security we are dedicated to protecting what matters most — your property, your people, and your peace of mind. With over 30 years of experience in the security industry, our locally based team delivers dependable, round-the-clock solutions for residential, commercial, and industrial properties throughout Hertfordshire and the surrounding areas. Trusted by homeowners, businesses, and local authorities alike, Main Door Security stands for professionalism, integrity, and a firm commitment to your safety.

We Specialise In Delivering Trusted Security Services & Professional Protection.

With over 30 years in security, MainDoor Security’s skilled professionals provide friendly, dependable, and effective solutions. We make your safety our priority.

What We Do

Professional Security Services Tailored to Your Home or Business.

Main Door Security Stevenage offers expert security services, SIA-approved training, and accredited First Aid courses across Hertfordshire. From CCTV and door systems to on-site guards and emergency response, we keep you safe. Our hands-on training helps you gain your SIA licence and build a career in security with confidence.

Training Courses

Get SIA-approved security training in Hertfordshire—from door supervision to first aid. Learn from experienced professionals and boost your career.

Public Sector

Professional security support for public sector organisations across Hertfordshire—keeping people and places safe, every day.

Construction Security & Vacant Property Protection

Trusted protection for construction sites and vacant properties across Hertfordshire—keeping your assets secure around the clock.

Courses

Main Door Security Stevenage offers expert security services, SIA-approved training, and accredited First Aid courses across Hertfordshire. From CCTV and door systems to on-site guards and emergency response, we keep you safe. Our hands-on training helps you gain your SIA licence and build a career in security with confidence.

Expert Security Training for Real-World Situations

SIA Security Refresher Course

This SIA Security Refresher (Top-Up) course is designed for existing Door Supervisors who need to renew their licence and meet the latest industry standards.

Emergency First Aid

Gain essential skills to manage medical emergencies confidently until professional help arrives.

SIA Door Supervisor Course

The SIA Door Supervisor Course is a Six days and is broken down into four sections.

Why Choose Us

Experienced, Professional, and Always Reliable Security Solutions.

We put your safety first with high-quality security services designed around you.

Professional Team

Highly trained and licensed security professionals.

Quick Response

Rapid action and 24/7 availability.

Customised Security

Solutions tailored specifically for your needs.

Trusted Reputation

Proven track record with satisfied clients across industries.

Client Reviews

What Our Clients Say About Amazing precision and attention to detail.

Reliable and Professional Mobile Patrol Service We’re very happy with the mobile patrols provided by Main Door Security. The team was always punctual, highly professional, and maintained a visible presence that gave us real peace of mind. Their regular reports and communication were excellent, and we felt confident that our site was in safe hands. Would definitely recommend their services to anyone needing reliable site security.

Daniel Stevenage

Usually Asked

Frequently Asked Questions

We cover door supervision, retail and event security, residential guarding, close protection, and construction site security.
Yes, every team member is SIA-licensed, vetted, and professionally trained.
Yes — we have a diverse team and can accommodate specific staffing requests.
Definitely. We offer flexible solutions for both one-off and long-term security needs.
It’s a 1-day, in-person program with hands-on assessments and real-world scenario training.
Bring a valid photo ID, comfortable clothing, and a readiness to take part in practical training.
We serve clients across Hertfordshire, London, and can provide coverage nationwide if required.
You can request a quote or book a consultation directly via our website, phone, or email.
We provide Emergency First Aid, Door Supervisor, Conflict Management, and other SIA-compliant training courses.
All sessions take place at our in-person training facility at the BTC Centre in Stevenage.
Yes, successful candidates receive an accredited certificate valid for work in regulated sectors.
No — our courses are open to beginners and include all the training needed to get started.

Looking for Reliable Security Services or Professional Training?

From licensed door supervision and event security to certified first aid courses, we deliver trusted solutions for both individuals and businesses across the UK.

Our Blog

Stay informed with the latest updates in security, training, certifications, and real-world industry insights — all in one place.

Explore Expert Advice, Industry News, And Security Insights.

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