Interior design SEO works best for firms that serve a specific geography (one city or metro area) and have a clear design niche — residential, hospitality, commercial, kitchen/bath, staging, etc. If your business model depends on local clients finding you online, SEO is a core investment. Studios with a strong portfolio but weak Google visibility see the fastest results because the demand exists; SEO just makes you visible to it.
Design firms that rely entirely on referrals or interior design platform exposure may benefit less, but most studios today find 30-50% of qualified inquiries come from Google. If your phone isn't ringing from organic search, this is where that opportunity sits.
Brand-new studios and established firms both see results, though new studios need patience — Google trusts established businesses more, so ranking takes longer if you're under 1-2 years old.