William King Construction

What William King Construction does

William King Construction is a family-run construction services firm founded in 2008 by William and Lisa King and headquartered in Cleator Moor, Cumbria. The company delivers a diversified portfolio of construction services across four verticals: bespoke residential (luxury homes, new builds, extensions, and renovations concentrated in Cumbria and the Lake District), commercial construction (offices, retail fit-outs, mixed-use spaces), civil and masonry works, and heritage restoration. It also holds a distinctive position as a Programme and Project Partner to Sellafield Ltd, performing safety-critical nuclear contracting including BEPPS/DIF, BEP, SCP, CNC, and SRP projects, and subcontracts to Tier-1 contractors such as Sir Robert McAlpine, Morgan Sindall, Balfour Beatty, Jacobs, Mitie, and Altrad at the Sellafield site.

The business operates with a team of 50+ specialists holding ISO 9001 quality management certification, with NEBOSH, City & Guilds, and CITB-trained staff, and is currently pursuing FIRAS accreditation for fire protection. It maintains offices in Cleator Moor (HQ), Seascale (Sellafield operations), London, and a training academy at Westlakes Science Park in Moor Row. Technical capability spans in-house plastering, joinery, groundworks, painting, fire protection, and commercial flooring, supported by sustainable building practices including 75% recycled block systems and rainwater harvesting. The company has won multiple LABC regional awards for residential quality and is a member of the National Federation of Builders Heritage Group.

Revenue is generated through project-based contracts as both principal contractor and subcontractor, with pricing determined per engagement scope. The go-to-market is direct enterprise field sales targeting UK public and private sector clients, with a heavy concentration of long-term repeat work tied to the Sellafield decommissioning portfolio and referral-driven residential demand in West Cumbria. The firm remains privately held by its founders with no external institutional investment identified.

Name

William King Construction

Legal name

William King Construction

Website

https://williamkingconstruction.co.uk

Company type

Private

Founded year

2008

Operating status

Operating

Headcount range

11–50 employees

Short description

William King Construction is a family-run UK contractor founded in 2008, delivering bespoke residential, commercial, civil, and heritage construction alongside safety-critical nuclear contracting as a Programme and Project Partner to Sellafield Ltd.

Ownership category

akta.pro rank

Product category

Construction Services

NAICS

Nonresidential Building Construction (2362), Heavy and Civil Engineering Construction (237), Residential Building Construction (2361), Construction of Buildings (236), Other Heavy and Civil Engineering Construction (2379)

SIC

Operative Builders (1531), General Bldg Contractors - Nonresidential Bldgs (1540), Heavy Construction Other Than Bldg Const - Contractors (1600), General Bldg Contractors - Residential Bldgs (1520), Construction - Special Trade Contractors (1700)

akta.pro primary industry

Office & Corporate Building Construction (IMAFACAA)

akta.pro secondary industries

Government & Civic Building Construction (Courthouses, City Halls, Public Safety) (IMAFACAF), Religious & Cultural Building Construction (Places of Worship, Museums, Libraries) (IMAFACAH)

Keywords

• Residential construction services
• Commercial construction services
• Nuclear contracting services
• Heritage building restoration
• Commercial flooring installation

Headquarters

HQ city

Cleator Moor

HQ country

United Kingdom

HQ region

Europe

Offices4 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Construction Services Revenue: Full-service construction company delivering residential projects (luxury homes, new builds, extensions, renovations), commercial projects (offices, retail units, mixed-use spaces), civil engineering works, and nuclear sector contracting. Revenue generated through project-based contracts as principal contractor or subcontractor.
2. Nuclear Sector Contracting: Long-term involvement in the nuclear sector supporting high-standard, safety-critical environments at Sellafield site. Delivers technically demanding civil and maintenance works including BEPPS/DIF, BEP, SCP, CNC, and SRP projects.

Pricing tiers

Go-to-market motion2 records

Distribution channels2 records

Marketing channels4 records

Core offering

William King Construction is a family-run construction company delivering residential new builds and domestic improvements, commercial construction and masonry, civil engineering, heritage restoration, commercial flooring, and nuclear contracting services across the UK. The company operates as both principal contractor and subcontractor, with a Programme and Project Partner role at the Sellafield site delivering safety-critical civil and maintenance works. Services are anchored by a team of over 50 specialists and supported by ISO 9001 quality management.

Product overview

William King Construction is a family-run construction company offering a diversified portfolio of construction services across residential, commercial, civil, and nuclear sectors. The company operates as a unified service provider combining nuclear contracting (including Sellafield site work), civil building and masonry, bespoke new build homes, domestic improvements, commercial flooring, and heritage restoration. Services are delivered through integrated teams with in-house expertise across all trades including plastering, joinery, groundworks, painting, and fire protection. The company serves clients throughout the UK with a focus on Cumbria and the Lake District region.

Differentiator

Problem solved

Functional benefit

Products and services

• Nuclear Contracting Services Civil and nuclear construction contracting services delivered to the nuclear industry, including work on Sellafield site projects such as BEPPS/DIF, BEP, SCP, CNC, and SRP. William King Construction is a Programme and Project Partner to Sellafield Ltd and delivers subcontracting services to major nuclear contractors including Sir Robert McAlpine, Morgan Sindall, Balfour Beatty, Jacobs, Altrad, M&W Group, and Mitie.
• Civils and Masonry Services Civil building and masonry contracting services including plastering, joinery, groundworks, painting, and fire protection services for commercial and nuclear environments. Delivers building, refurbishment, and fit-out of commercial offices, retail units, and mixed-use spaces across the United Kingdom.
• New Build Homes Bespoke architect-designed residential new builds, including luxury homes, completed to the highest standards with quality materials and craftsmanship. Targeted at private homeowners across Cumbria and the Lake District.
• Domestic Improvements Residential extensions, renovations, and home improvements including extensions, garages, and comprehensive building management from consultation to completion. Targeted at private homeowners in Cumbria and the Lake District.
• Commercial Flooring Commercial flooring installation services including vinyl, hardwood, and safety flooring for restaurants, retail, offices, and industrial facilities including the Sellafield site.
• Heritage Restoration Historic building restoration services for listed buildings, including window replacement, traditional craftsmanship combined with modern technologies, and working with heritage consultants and local planning authorities.
• Fire Protection Services Fire stopping services and fire protection installation for nuclear facilities, maintaining I.C.L and LTQR records with FIRAS accreditation in progress for passive and active fire protection systems.

Quantifiable outcome

• Multiple LABC award wins for residential developments
• +2 more outcomes

Named customers11 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Partnerships

15 partnerships are on record, tiered core and minor.

• Sellafield LtdcoreStrategic or Co-development PartnerWilliam King Construction is a Programme and Project Partner to Sellafield, delivering nuclear contracting services including BEPPS/DIF, BEP, SCP, CNC, SRP projects. The company continues to support the decommissioning portfolio on the Sellafield site in Cumbria.
• Sir Robert McAlpinecoreChannel Partner/ Reseller/ DistributorMajor nuclear sector client for whom William King provides subcontracting services on Sellafield projects.
• Morgan SindallcoreChannel Partner/ Reseller/ DistributorMajor nuclear sector client for whom William King provides subcontracting services on Sellafield projects.
• M&W GroupcoreChannel Partner/ Reseller/ DistributorMajor nuclear sector client for whom William King provides subcontracting services on Sellafield projects.
• JacobscoreChannel Partner/ Reseller/ DistributorMajor nuclear sector client for whom William King provides subcontracting services on Sellafield projects.
• Balfour BeattycoreChannel Partner/ Reseller/ DistributorMajor nuclear sector client for whom William King provides subcontracting services on Sellafield projects.
• MitiecoreChannel Partner/ Reseller/ DistributorMitie is a key client for whom William King provides flooring contracts, fire protection, and heritage restoration services across the Sellafield site supporting their maintenance contract.
• Aspire AcademycoreStrategic or Co-development PartnerWilliam King Construction is part of the founding team of Aspire Academy, formed to encourage and support under-privileged school children into employment. The programme focuses on hands-on bricklaying skills at a bespoke training facility at Westlakes Science Park.
• UTC (University Technical College)minorStrategic or Co-development PartnerWorking with UTC to identify potential T-Level candidates who will join William King on a 2-year placement from September 2024.
• PHP Partnership ArchitectscoreImplementation/ SI/ Consulting PartnerDesign partner for multiple projects including One Acre, Seascale and Former Whitehaven News Building Renovation. William King's honesty and integrity towards costs and client variations is highly commended.
• PHP Architects (North East)coreImplementation/ SI/ Consulting PartnerArchitects for the Former Whitehaven News Building Renovation project, transforming a local landmark into a modern community and civic space.
• DDP PartnershipminorStrategic or Co-development PartnerFunding provider for the Frizington Youth and Community Centre project. DDP is a group actively involved in operations at the Sellafield site, committed to supporting local infrastructure.
• Copeland Borough CouncilminorStrategic or Co-development PartnerLocal government partner working with William King Construction on various projects in the Cumbria area.
• Countryside ConsultantsminorImplementation/ SI/ Consulting PartnerHeritage architectural partners for refurbishing some of Whitehaven harbour's oldest buildings.
• AltradcoreChannel Partner/ Reseller/ DistributorNuclear sector client for whom William King provides subcontracting services on Sellafield projects.

Scale indicators4 records

Recent moves1 record

Expansion highlights5 records

Direct peers

• Caddick Construction: Northern England-based contractor delivering commercial, residential, industrial and leisure schemes of similar mid-market scale, with similar principal contractor and design-and-build capabilities.
• Russell WBHO: UK construction firm of similar headcount delivering commercial, residential, heritage and civil projects across northern England, with comparable mix of new build, refurbishment and structural/civils work.
• Eric Wright Group: Lancashire-headquartered construction and property group of comparable size operating across commercial, residential, civil and heritage sectors in the North West — overlapping William King's geographic and service footprint.
• McGoff Construction: North West England contractor of similar scale delivering new build, refurbishment and fit-out across commercial, residential and healthcare segments — close geographic and operational peer.
• Clegg Construction: East Midlands-based general contractor of comparable size (50–250 employees) delivering commercial, residential, healthcare and education schemes as both principal and subcontractor in the UK — directly comparable in scale, scope and delivery model to William King Construction.
• GMI Construction Group: Mid-sized UK contractor delivering commercial, residential, education and healthcare schemes in northern regions with comparable principal/subcontractor delivery model.
• Bamber Bridge-based F Parkinson: Long-established Northern England contractor of comparable headcount delivering commercial, industrial, heritage and public-sector schemes with similar principal contracting capabilities.

Regional players

• Lake District Heritage Homes (regional Cumbria builders): Smaller Cumbria/Lake District-focused residential and heritage builders who compete for the same luxury home and listed-building projects in William King's core regional market.

Emerging players

• Nuvia UK: Specialist nuclear services and construction firm operating at UK civil nuclear sites including Sellafield, providing an adjacent subcontractor model for safety-critical construction, fire protection and decommissioning works.

Broad incumbents

• Mitie (construction services division): Major UK facilities management and infrastructure services provider, listed as a key William King client at Sellafield. Comparable in fire protection, flooring and heritage work but at much greater scale and breadth.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/WilliamKngConstruction
• LinkedInlinkedin.com/company/william-king-construction

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about William King Construction