Delivering security-cleared construction and civil engineering works across Cumbria’s nuclear industry – with the standards, accreditations and track record that complex sites demand.
William King Construction has been operating within Cumbria’s nuclear sector for over 15 years. We understand the rigorous demands of working within licensed nuclear sites – the compliance requirements, the security protocols, the documentation standards, and the zero-tolerance approach to risk.
Our team is fully security cleared, and our management systems are designed specifically to meet the expectations of nuclear operators, main contractors, and the wider NDA supply chain.
From plant maintenance and modification works to new-build civil infrastructure, we deliver on technically demanding scopes where reliability and compliance are non-negotiable.
Approved and active supplier within the NNB/Sellafield PPP framework.
All site personnel vetted to the required clearance levels for nuclear access.
Certified quality management system meeting nuclear-sector documentation requirements.
Full environmental management framework aligned to nuclear operational standards.
Our nuclear and civil works capability spans construction, maintenance, infrastructure and specialist civil engineering – all delivered to the highest standards of compliance and safety.
New build and extension works within operational nuclear facilities, delivered to strict site requirements and safety cases.
Reactive and planned maintenance, minor works and plant modifications on live nuclear sites requiring full operational protocols.
Earthworks, drainage, ground remediation, foundations and civil infrastructure works across nuclear and industrial sites.
Construction and enabling works to support decommissioning programmes - segregation structures, access infrastructure and waste handling facilities.
High-security fencing, access control infrastructure, gatehouse construction and perimeter upgrades to ONR and site-specific standards.
Mechanical and electrical services installation and containment within nuclear buildings, working alongside specialist M&E contractors.
We are not a general contractor dipping into the nuclear sector. William King Construction has worked continuously within Cumbria's nuclear industry for over 15 years - we know the sites, the systems and the standards inside out.
Our workforce holds the necessary security clearances. There are no delays to mobilisation while waiting for vetting - we can deploy quickly against programme-critical scopes.
As an active Sellafield Programme and Project Partner, we operate within the approved supply chain - reducing procurement friction for main contractors and operators.
Our IMS, quality plans and method statements are written to meet nuclear-sector expectations - not adapted from a general construction template.
Delivery of a comprehensive security infrastructure upgrade across the Sellafield site, completed to strict nuclear operational standards, site-specific compliance requirements and within a safety-critical live environment.
Major civil enabling package including excavation, drainage and foundations for new facility construction within the licensed site boundary.
Multi-year planned maintenance contract covering structural, fabric and minor civil works across operational nuclear plant areas.
Full design and build of a new welfare complex, offices and ancillary facilities to serve an expanded workforce area on the licensed site.
Multi-year planned fire stopping programme across specialist buildings on the Sellafield site. Fully documented to ICL and LTQR standards, delivered by a dedicated team of trained and security-cleared operatives.
Whether you are a main contractor tendering a nuclear package or an operator with a direct requirement, we welcome the conversation.
