At Castell, we're passionate about building high quality social homes and communities — and we're growing fast. With a secured land pipeline set to deliver 40% year-on-year growth over the next few years, we're looking for an experienced Senior Quantity Surveyor to lead cost management and commercial control across our live construction sites.
About Us
Castell is part of a Welsh housing developer founded in 2019 with a simple mission: to help solve the housing crisis by delivering affordable, high quality, disability-adapted homes in partnership with housing associations and local authorities. What started as a small team has grown into a business of over 70 people, having already delivered hundreds of homes across South Wales with hundreds more currently on site.
The Role
The Senior Quantity Surveyor is a key commercial lead across our live sites, owning cost management from pre-construction through to final account. You'll take responsibility for a portfolio of forward-sold, JCT Design & Build contracts delivered for housing associations and local authorities, working closely with the Commercial Manager, site teams and pre-construction to protect margin, manage risk and keep valuations and cost reporting accurate and on time.
This is a hands-on, senior commercial role in a fast-growing contractor — ideal for someone who takes ownership of their sites, is comfortable managing subcontractor accounts end-to-end, and wants to help shape the commercial processes that will scale with us.
Key Responsibilities
- Take full commercial ownership of a portfolio of live sites, from pre-construction cost planning through to final account
- Prepare and issue monthly cost & valuation reports (CVRs), agreeing valuations with clients and Employer's Agents
- Manage the subcontract procurement process, including enquiries, tender analysis, and placing subcontract orders
- Value subcontractor works, agree payment certificates, and manage the payment notice / pay-less process under the relevant contract
- Administer main contracts (predominantly JCT Design & Build) including notices, variations, extensions of time and loss & expense claims
- Prepare and agree interim valuations and applications for payment with clients, and manage cash flow forecasting for your sites
- Identify, price and negotiate variations and change instructions, and lead value engineering initiatives without compromising quality or safety
- Manage retentions, defects and final account close-out across your site portfolio
- Work closely with the QS and pre-construction teams to ensure a smooth handover from tender to delivery
- Support dispute avoidance and, where necessary, dispute resolution, working with the Commercial Manager and external advisers
- Maintain accurate commercial records and support internal and external audit requirements
- Mentor and support less experienced members of the QS team
What We're Looking For
- Proven experience as a Senior Quantity Surveyor or similar role within residential construction or affordable housing
- Strong working knowledge of JCT Design & Build contracts and standard forms of subcontract
- Solid experience of cost control, CVR reporting, valuations and final accounts
- Confident negotiator, comfortable managing subcontractor accounts and contractual correspondence
- Experience working with Registered Providers / housing associations or local authority clients is a strong advantage
- Degree qualified in Quantity Surveying or a related discipline (or equivalent experience); MRICS or working towards is desirable
- Comfortable with industry-standard cost management software and confident with Excel
- Organised, deadline-driven and comfortable owning your own site portfolio
- A natural problem solver who is excited by the pace and ambition of a fast-growing business
What We Offer
Salary: £60,000 – £65,000 per annum, depending on experience.
- Pension scheme
- Private healthcare
- Onsite parking
- Bonus incentive scheme The chance to lead commercial delivery on one of Wales's fastest-growing housebuilders, and be part of a mission that puts families into high quality, affordable homes
How to Apply
If you're ready to bring commercial rigour, pace and precision to a site portfolio that's scaling fast — apply now.
Pay: £60,000.00-£65,000.00 per year
Benefits:
- Free parking
- On-site parking
- Private medical insurance
Work Location: In person
