Gratte Brothers |Building Services Maintenance (GBBSM) is looking for a highly organized Principal Estimator to join our team at our King’s Cross HQ.

About the Role

As our Principal Estimator, you’ll take ownership of the full bid lifecycle – from initial enquiry through to contract award, mobilisation, and handover. This senior, high-impact role combines commercial leadership with technical expertise, driving both new business and contract renewals. You’ll lead tender preparation, develop robust cost models, conduct site surveys, coordinate subcontractors, and ensure smooth mobilisation and transition into operations. Post‑award you’ll continue to add value through cost management, asset validation, and supporting the commercial team.

Qualifications

Ideal for an experienced FM professional with a strong track record of winning bids, deep knowledge of maintenance operations, and the ability to influence, negotiate, and deliver results i...