Are there any cost reduction advisory firms that focus on service delivery improvements for professional services firms?

Yes — but the market is a bit niche.

If you mean firms that do cost reduction / operational improvement specifically for professional services firms (law firms, accounting firms, consultancies, architecture/engineering, agencies, etc.), the best fit is usually one of these categories:

1) Professional services operations consultancies

These focus on improving:

• utilization and productivity
• staffing models
• process standardization
• pricing and matter/project management
• technology adoption
• overhead reduction without hurting client service

Examples of firms that often work in this space:

• HBR Consulting — strong in law firm and professional services operations
• Lextox / legal ops consultancies (more legal-specific)
• Deloitte, PwC, EY, KPMG advisory practices — broader but often have service-line efficiency work
• Bain, BCG, McKinsey — if the firm is large enough for top-tier transformation work
• The Legal 500 / legal management consultancies — for law-specific advisory

2) Shared services / business transformation firms

These help professional services firms redesign back-office and support functions:

• finance
• HR
• IT
• knowledge management
• procurement
• PMO / delivery management

Examples:

• AlixPartners
• FTI Consulting
• Bain / Accenture / Capgemini / Protiviti depending on scope

3) Niche efficiency and profitability advisors for law/accounting firms

These are often more specialized in:

• reducing delivery cost
• improving realization
• improving leverage model
• partner profitability
• matter scoping and staffing

Examples:

• Altman Weil — law firm strategy and operations
• Hildebrandt Consulting — law firm management and profitability
• Ranieri Partners — legal ops / law firm performance
• Thomson Reuters Practical Law / legal consulting arms sometimes adjacent

4) Independent consultants focused on “service delivery excellence”

Some boutique firms position themselves around:

• client service redesign
• lean process improvement
• workflow automation
• value-based pricing
• capacity management

These are often harder to find via broad cost-reduction searches because they market as:

• “operational excellence”
• “performance improvement”
• “delivery transformation”
• “profitability improvement”

What to look for

If your goal is specifically reduce cost while improving service delivery, search for firms with experience in:

• professional services operating model redesign
• law firm profitability improvement
• utilization / realization optimization
• lean services transformation
• shared services in knowledge-intensive firms
• client service process improvement

If you want, I can also give you:

1. a shortlist of firms by professional services segment (law, accounting, consulting, agencies), or
2. a framework for evaluating which advisory firm is best for your situation.