Contract Senior Mechanical Engineer (Building Services)

Job description

Outside IR35 Consultant Senior Mechanical Design Engineer Role - £5.8k-£6.3k net earnings per month

I’m currently supporting a well-established building services consultancy in East London who are looking to bring on x2 Contract Mechanical Design Engineers for a strong pipeline of mixed-use projects.

Key details:

• Mixed-use schemes
• RIBA Stages 3/4 onwards
• 1–2 days per week in the office (hybrid working)
• IT equipment provided
• Likely outside IR35 (client-led determination)
• £45–£48 per hour
• Immediate start (targeting late February)

LTD Company Earnings Guide:

At £45–£48ph (37.5 hrs/week), this equates to approximately £7,300–£7,800 per month invoiced.

After Corporation Tax (19% - 25% depending on profit levels), this would leave roughly £5,800–£6,300 per month retained in the company, before dividend or personal tax.

(Indicative only, subject to your accountant’s structuring and individual circumstances.)

They’re looking for strong design-focused engineers who can work autonomously and hit the ground running on detailed design and technical delivery.

Apply here!

Extra information

Status

Open

Education Level

Secondary School

Location

London Area

Type of Contract

Full-time jobs

Published at

01-03-2026

Profession type

Manufacturing / Industrial

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English