We’ve been working with clients across South Wales and beyond for over 55 years.

Our Heritage

We’re proud to be a family construction business – we’ve been working with clients across South Wales and beyond for over 55 years.

M&J Cosgrove was founded by Jack and Marlene Cosgrove in 1968 – they started out building council houses, and soon grew their business into one of the leading construction companies in South Wales, with a portfolio of award-winning construction, refurbishment and development projects for local authorities, health authorities, retail and commercial clients.

Gary Cosgrove took over the running of the business in 1994, and the family values upon which the business was founded endure to this day – building collaborative relationships with our clients, delivering a personal, one-to-one service, and putting quality and service at the heart of everything we do.

Personal Service

In our experience, one size rarely fits all. That’s why we offer a personal, collaborative approach to your project, no matter how big or small.

Complete Solutions

We’re proud to be a family construction business – we’ve been working with clients across South Wales and beyond for 55 years.

"The methods have changed but the principles remain the same. Pride in the job… always.”

Gary Cosgrove, MD