G3 Systems Ltd
Estimator
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Location: Osprey Quay, Portland, Dorset
Employment Type: Full Time, Permanent
Salary: Starting from £45,000 per annum, dependent on experience
Join G3 Systems
G3 Systems is a specialist engineering, infrastructure and life-support solutions provider, delivering complex projects for defence, government and commercial customers across the UK and internationally.
Our work spans deployable infrastructure, construction, engineering and facilities operations, often within challenging and highly regulated environments. As our project portfolio continues to grow, we are looking for an experienced Estimator to join our Commercial team and play a key role in developing competitive, accurate and commercially robust tender submissions.
The Role
As an Estimator, you will be responsible for preparing accurate, timely and commercially competitive cost estimates for a range of defence, government and commercial construction, engineering and infrastructure projects.
Working closely with Business Development, Engineering, Procurement, Project Management and Finance, you will analyse tender requirements, develop detailed pricing models, obtain and evaluate supplier and subcontractor quotations, and identify commercial, technical and programme risks.
You will play an important role in helping G3 Systems secure profitable contracts, supporting opportunities across the UK and international markets.
Key Responsibilities
- Review Invitations to Tender (ITT), Requests for Proposal (RFP) and customer documentation.
- Analyse specifications, drawings, schedules and Bills of Quantities.
- Produce detailed estimates covering labour, materials, plant, equipment and subcontract services.
- Develop comprehensive cost models, pricing schedules and tender submissions.
- Obtain, evaluate and compare supplier and subcontractor quotations.
- Liaise with Engineering teams to validate technical assumptions and estimating inputs.
- Support value engineering activities to optimise project costs.
- Identify commercial, programme and technical risks during bid preparation.
- Assist in developing pricing strategies that maintain competitiveness while protecting company margin.
- Prepare tender clarifications, exclusions, qualifications and pricing assumptions.
- Participate in internal bid reviews and governance meetings.
- Maintain estimating databases, cost libraries and historical cost records.
- Support post-tender negotiations and commercial discussions where required.
- Work alongside Procurement to understand current market pricing and supply-chain trends.
- Ensure estimates comply with G3 Systems' governance procedures and customer requirements.
- Contribute to the continuous improvement of estimating processes, tools and templates.
- Maintain the confidentiality of commercially sensitive information.
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Qualifications
You will ideally hold an HNC/HND, Degree or equivalent qualification in one of the following:
- Quantity Surveying
- Construction Management
- Civil Engineering
- Mechanical or Electrical Engineering
- Commercial Management
Equivalent practical experience will also be considered.
Essential Skills & Experience
- Previous experience working as an Estimator within construction, engineering or infrastructure.
- Proven experience preparing detailed and accurate cost estimates.
- Understanding of labour resource planning and project build-ups.
- Ability to interpret engineering drawings, specifications and technical documentation.
- Experience obtaining and evaluating supplier and subcontractor quotations.
- Strong commercial awareness and understanding of cost and margin.
- Experience working to demanding tender and bid deadlines.
- Excellent Microsoft Excel skills, including the ability to develop and manage detailed cost models.
- Strong analytical and numerical skills with the ability to produce detailed cost analysis.
- Excellent written and verbal communication skills.
- Strong attention to detail and the ability to manage multiple bids and priorities.
Desirable Experience
Experience in any of the following would be advantageous:
- Defence sector projects.
- Ministry of Defence (MOD) contracts.
- International construction projects.
- NEC3/NEC4 contracts.
- JCT contracts.
- Modular construction.
- Deployable infrastructure.
- Temporary works.
- Building services / MEP.
- Facilities Management.
- Whole-life cost planning and cost management throughout the project lifecycle.
- Experience using estimating software such as ConQuest, Causeway, Candy, CostX or similar.
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Salary, Benefits & Working Arrangements
Benefits
- 37.5 hour working week
- Working pattern/schedule agreed with the Head of Business Development & Proposals.
- 25 days' annual leave per holiday year (January to December).
- Defined pension scheme.
- Life Assurance: 3.5 times annual salary.
- YuLife wellbeing platform.
- Following successful completion of the probationary period, Company sick pay: entitlement to 12 weeks' company sick pay.
- Salary sacrifice schemes, including electric vehicle and Cycle to Work schemes.
- Private Medical Insurance: Single cover provided by BUPA, including dental cover.
- Family PMI: Option to include named spouse/partner and/or family members on the same scheme, with any additional cost self-funded by the employee.
Why Join G3 Systems?
This is an excellent opportunity to join a growing international engineering business and work on challenging and varied projects across the defence, government and commercial sectors.
You will have the opportunity to work across the full tender lifecycle, collaborating with experienced colleagues across Commercial, Engineering, Procurement and Project Management, while contributing directly to G3 Systems' continued growth.
If you are an experienced Estimator looking for a role where your commercial expertise, analytical skills and construction or engineering knowledge can make a real difference, we would be keen to hear from you.
Security Requirements
This position is subject to successful pre-employment screening and will require the successful candidate to obtain and maintain the appropriate security clearance, which may include BPSS, Security Check (SC) and client-specific security requirements.
G3 Systems Ltd is an equal opportunities employer and welcomes applications from suitably qualified candidates regardless of age, disability, gender identity, marriage or civil partnership status, pregnancy or maternity, race, religion or belief, sex or sexual orientation.
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