Business Details
50+ Years
experience
Trusted Construction Experts in South Wales
M & J Cosgrove has been delivering quality construction services in South Wales for over 55 years. Founded in 1968 by Jack and Marlene Cosgrove, we began as a council house builder and have grown into a leading regional contractor with a reputation for excellence in commercial, local authority, health authority, and retail projects. Our family values remain central to our approach, emphasizing collaborative relationships, tailored solutions, and a commitment to quality and safety. With expertise in conservation work and site development, we offer end-to-end services from land acquisition and design to full project delivery.Our team brings decades of local knowledge and technical proficiency to every project, no matter its scale. We pride ourselves on maintaining the principles established at our founding: pride in every job, a personal service, and unwavering attention to client needs. As a trusted partner to clients across South Wales and beyond, we continue to innovate while upholding the heritage that has defined our success.
Services
Residential construction
Commercial development
Refurbishment projects
Conservation work
Public sector builds
Timber frame housing
Demolition services
Design and build packages
Details
- Year established: 1968
Highlights and features
- We have over 55 years of experience in South Wales construction projects
- Our family values ensure a personal, collaborative approach to every project
- We offer end-to-end solutions from land acquisition to project completion
- Our team has specialist expertise in conservation and heritage buildings
- We maintain long-standing partnerships with local authorities and health organisations
Services
Residential construction
We design and build high-quality residential developments including timber frame bungalows and apartment complexes. Our expertise covers all stages from planning to completion, ensuring energy efficiency and modern living standards. Recent projects include 152-unit schemes and specialist housing for vulnerable populations.
Commercial development
Delivering commercial buildings for retail and office use with comprehensive package deals. Our experience includes complete refurbishments and adaptive reuse of historic structures. We work closely with clients to create functional spaces that meet specific business requirements while maintaining aesthetic appeal.
Refurbishment projects
Specialists in modernising existing structures while preserving heritage elements. Services include complete interior renovations, accessibility improvements, and systems upgrades. Recent work includes transforming former police stations into residential units and upgrading community hubs with modern facilities.
Conservation work
Preserving historical buildings through careful restoration techniques. We maintain original architectural features while incorporating modern requirements. Our team has extensive experience with listed buildings and sensitive sites across South Wales.
Public sector builds
Delivering essential infrastructure for local authorities and health organisations. Projects include mental health facilities, homeless accommodation, and community centres. We prioritise social value and long-term functionality in all public sector developments.
People
Gary Cosgrove
Managing Director
Gary Cosgrove has led M&J Cosgrove since 1994, continuing the family legacy established by his parents. With over 30 years of leadership experience, he maintains the company's founding principles while driving innovation in construction methods and sustainability practices.
Questions
What types of construction projects do you specialise in?
We specialise in residential developments, commercial buildings, public sector projects, and heritage conservation work across South Wales.
How long has M&J Cosgrove been in business?
We've been operating since 1968, providing construction services for over 55 years with three generations of family leadership.
Do you handle both new builds and refurbishment projects?
Yes, we offer comprehensive services for new developments and complete refurbishments, including adaptive reuse of existing structures.
What areas do you cover?
While based in Cardiff, we work throughout South Wales including Newport, Rhondda Cynon Taf, and Bridgend, with select projects beyond the region.
Can you assist with planning and design stages?
Yes, we provide full package deals including land acquisition, design, planning permission, and complete construction management.
How do you ensure project quality?
Our quality assurance combines experienced project management, regular client communication, and adherence to modern building standards while maintaining traditional craftsmanship.
