The industrial and commercial construction industry is very invested in the compartmentalized construction, also known as modular construction and prefab. Most people think of mobile homes when they think of modular, but really we are talking about for example 12 foot sections of steel raised cable tray wrapped around 16 generators that support the cabling interconnecting the generators to the switchgear and provide backup power to a 60 MW data center that houses all of the servers that allow you to upload tik-toks (Oracle).

All of that steel gets prefabricated at a third party vendor and delivered with all the nuts and bolts similar to an Ikea desk. It is a large and complex industry with not enough players. Reputation in projects is important in this industry, as well as networking.

Industrial maintenance is also very good for recurring revenue, as heavy duty sites need constant inspections and adjustment. In the US there are OSHA requirements for inspections and testing of components. Sometimes sites have in-house painters, welders, engineers and others for maintenance, but there is always a need for third parties when the lift gets to large for an in-house crew. I have no idea about the industry in Spain, my point of reference is Northern Virginia and the mid-atlantic in general.

Thanks, Enrique, after talking to some experts it seems that in Spain, the maintenance is similar to your experience which helped me understand the business model. Regarding the construction model, expanding and innovating on that part of the business could be a great idea. We'll look closer to potential players already doing this in Spain.

Thank you very much!!