Data warehouse vs Data mart (sql server)
This is a pretty good question. This topic, many times, gets over-thought. It really all comes down to business needs.

If the need to compartmentalize data in to different subject areas (Finance, Sales, Manufacturing, Inventory, etc...) If this is far out of scope for the business cases, then you should probably stick with your standard database schema.

From my view point, a single data mart is not terrible useful except for in fringe cases where a single department has needs for a data warehouse like reporting infrastructure... Then a data mart might be useful.