Assistant Quantity Surveyor Welwyn Garden City (office based with site visits and hybrid working) Salary: £25,000 – £47,000 Benefits Car or allowance 25 days holiday Enhanced pension scheme Private medical cover Flexible working and hybrid working arrangements Industry‑leading training and structured career progression Long‑term project pipeline and job security The Company A leading Tier 1 Main Contractor is seeking an Assistant Quantity Surveyor to join its Welwyn Garden City office. The business is recognised for its people‑first culture, long‑term stability, and strong commitment to wellbeing, diversity, mental health support, and sustainability. With Investors in People Platinum accreditation, they offer a collaborative and supportive commercial environment with clear progression routes. You will work across a portfolio of major building projects within the London & Home Counties division, gaining exposure to a variety of construction methods and contract types, including JCT. The role is office based with regular site visits and the flexibility of hybrid working. Responsibilities Assist the Commercial Lead with day‑to‑day quantity surveying and commercial management duties. Prepare and maintain accurate site records, cost reports, valuations, and subcontractor payments. Support procurement, cost control, forecasting, and contract administration. Ensure compliance with JCT contract requirements and internal commercial procedures. Work collaboratively with project, design, and site teams to support successful project delivery and financial performance. Contribute to value engineering, risk management, and commercial reporting. The Right Person HNC or BSc in Quantity Surveying or a related construction discipline. Experience with a main contractor or subcontractor. Strong understanding of cost reporting, measurement, commercial processes, and JCT contracts. Excellent communication skills, attention to detail, and a proactive, team‑focused approach. Ambition to progress to Quantity Surveyor level with full training and support. Keywords Assistant Quantity Surveyor, AQS, Quantity Surveyor, QS, Junior Quantity Surveyor, Commercial Assistant, Commercial Team, Tier 1 Contractor, Main Contractor, Construction, Building, Commercial Management, Cost Reporting, Cost Control, Procurement, Valuations, Final Accounts, JCT Contract, Construction Jobs, Surveying Jobs, London Construction, Hertfordshire Construction, Welwyn Garden City Jobs, Hybrid Working, Site Visits, Major Build Projects, Concrete Frame, Steel Frame, Cladding, APC Support, Career Progression