Building Services Engineer - Thames Valley South

At Acorn, people are at the heart of everything we do. With over 40 years’ experience delivering market‑leading engineering and compliance services across London and the South East, we have built a reputation based on trust, technical excellence, and long‑term partnerships with our clients.

We are currently seeking a Building Services Engineer to join our team, carrying out planned preventative maintenance (PPMs) across our sites around Thames Valley South area. You will carry out planned preventative maintenance, servicing and reactive repairs across a varied portfolio of client sites, working independently but supported by a dedicated helpdesk and contract management team.

Acorn promotes a professional, inclusive, and collaborative working environment where engineers are trusted and supported. You will be backed by a dedicated internal helpdesk, administration team, and experienced contract managers who understand the realities of working on site and are committed to helping you succeed.

Location: Thames Valley South

Salary: up to £44000 depending on experience plus overtime and callout

Hours: 41.25 hours a week

Company Benefits:

• Company Events
• Wellbeing Benefits – 24 hours turnaround GP appointment for the whole family
• 25 days holiday (not including bank holidays)
• Company Van and fuel card

The Role:

As a Van Mobile Engineer, you will be responsible for carrying out planned preventative maintenance, servicing and reactive repairs across multiple customer sites. You will work independently while maintaining close communication with clients, subcontractors, the helpdesk team and contract managers to ensure the highest levels of service delivery.

Key Responsibilities:

• Planned preventative maintenance and reactive maintenance works
• Diagnosing and repairing mechanical and building services plant
• Attending breakdowns and service calls
• Maintaining accurate records and reporting on completed works
• Liaising with clients and providing updates on work progress
• Maintaining site logbooks and compliance documentation
• Participating in the out-of-hours emergency call‑out rota
• Ensuring all work is completed safely and in accordance with company procedures

About You:

• City & Guilds in Mechanical Engineering or equivalent qualification
• Completed a recognised mechanical engineering apprenticeship or be a time‑served maintenance engineer
• Strong knowledge of M&E building services
• Experience working with HVAC systems, boilers, air conditioning, ventilation, heating and cooling systems
• Understanding of Legionella awareness and health & safety regulations
• Good working knowledge of Microsoft Office, including Outlook, Word and Excel
• Excellent communication and organisational skills
• Ability to work independently and as part of a team
• Full UK driving licence

Career Prospects at Acorn:

Acorn is committed to developing its people for the long term. Many of our engineers progress into senior engineering, specialist, or management roles as they grow within the business. We actively encourage skill development, increased responsibility, and career progression for individuals who show commitment, reliability, and a strong customer‑focused approach. As our service offering and client base continue to grow, there are ongoing opportunities for overtime, role development, and exposure to a wide variety of technically interesting sites and systems.

Why Join Acorn?

• A stable, well‑established company with over four decades of industry experience
• A supportive, knowledgeable internal team that understands engineering roles
• A strong focus on teamwork, professionalism, and safety
• Genuine long‑term career progression opportunities
• PPM‑led work across varied sites in the local and surrounding counties

We are an Equal Opportunity Employer and do not discriminate against any employee or applicant for employment because of race, colour, sex, age, national origin, religion, sexual orientation, gender identity, status as a veteran, and basis of disability.