Job Description

Posted:

Wednesday, January 7th, 2026
Are you an expert IES VE user with a passion for decarbonisation design? We have an exciting opportunity for a highly experienced mechanical building services design engineer to join our award-winning practice. Established in 1949, S I Sealy is the region's leading employer of building services engineering talent and a previous winner of the CIBSE National Employer of the Year award.

About S I Sealy

We work with high-profile clients locally and nationally on projects that make a real difference. We are at the forefront of helping organisations achieve

net zero

, using cutting-edge software and innovative design. Our culture is open, friendly and supportive, with a strong focus on professional growth. We are a

Carbon Neutral business

, verified to PAS2060. Hybrid working and flexible hours to support work-life balance.

Why this role is different

You will play a key role in delivering net zero and decarbonisation strategies, supported by advanced modelling tools. Your expert-level proficiency in IES VE will be central to producing detailed thermal modelling and energy analysis for complex projects. LCC (Low Carbon Consultant), LCEA (Low Carbon Energy Assessor) or NDEA are mandatory for this role. You will lead mechanical design on major projects, mentor junior engineers, and influence sustainable design outcomes.

You will: -

Lead mechanical design and coordination across commercial, public sector and healthcare projects. Produce detailed engineering designs using IES VE, AutoCAD, and Revit, ensuring compliance with energy efficiency and low or net zero carbon requirements. Develop decarbonisation strategies for new and existing buildings. Manage client relationships and support business development. Mentor junior engineers and contribute to technical leadership within the team.

What We're Looking For

Exceptional proficiency in IES VE and demonstrable experience in thermal modelling and energy analysis. Strong interest and experience in decarbonisation design and low-carbon technologies.

Essential Qualifications:

+ LCC (Low Carbon Consultant)
+ NDEA/LCEA Level 5 (Low Carbon Energy Assessor)

Additional advantageous qualifications:

+ ocDEA (On Construction Domestic Energy Assessor)
+ DEA (Domestic Energy Assessor)
+ One Click LCA
+ NABERS
+ CP1 - Heat Networks
+ Other relevant sustainability and energy assessment certifications.
Preferably BEng or MEng degree qualified, ideally Chartered. Membership of MCIBSE or MIMechE (IHEEM desirable). Minimum 5, ideally 10 years UK-based consultancy experience. Healthcare sector experience (HTMs/HBNs) or transferable skills such as cleanroom/laboratory design. Excellent project management and commercial awareness.

What We Offer

Attractive salary and comprehensive benefits package: + Private medical insurance
+ Life insurance and income protection
+ Stakeholder pension scheme
+ Generous holiday allowance (including your birthday off)
+ Flexible hours and hybrid working
+ Quarterly incentive payments
Ongoing professional development with customised training and monthly CPD seminars.

We are nice people - who look to make a difference. If that also describes you, come join us.

S I Sealy is an Equal Opportunities employer. ISO9001/14001/45001 & 19650 certified and verified Carbon Neutral to PAS 2060.