LTV, CAC, and ROAS for Interior Design Agencies

For interior design agencies, the most useful benchmark is usually LTV:CAC of at least 3:1, meaning a client should generate about three times what it costs to acquire them. ROAS is the campaign-level metric for ad efficiency, while CAC is the total cost to acquire a client, and LTV is the total value a client generates over the relationship.

• LTV: total revenue expected from a client over the full relationship.
• CAC: total sales and marketing cost divided by the number of new clients acquired.
• ROAS: revenue generated by an ad campaign divided by ad spend; useful for short-term campaign measurement, but it does not capture full client profitability.

For agencies specifically, the 3:1 rule is the clearest practical target because interior design is typically a professional services business with longer client value cycles than simple one-off transactions. One source on interior design KPIs says a ratio below 2:1 suggests marketing is too expensive or retention is weak, while 3:1 is the minimum standard for healthy, scalable growth.

A simple way to use these metrics together is:

• ROAS to judge whether a specific ad campaign is working.
• CAC to understand how much it costs to win a client overall.
• LTV:CAC to determine whether the business model is profitable and scalable.

If you want, I can also give you a worked example for an interior design agency showing how to calculate LTV, CAC, and ROAS from real numbers.