Consulting engagements come in five distinct models. Picking the wrong model usually wastes the whole budget. These are the shapes engagements actually take, based on the specialists on this directory.
Diagnostic audit (fixed price, 1-3 weeks)
A defined-scope audit against a specific area — SEO, CRO, Klaviyo, technical, operations, P&L. $1,000-$10,000 fixed price. Output: written findings with prioritized recommendations and estimated impact per recommendation. Best for merchants who suspect a problem but don't know the specifics. Frequently paired with follow-on execution work with the same consultant or an execution partner.
Strategy sprint (fixed price, 2-6 weeks)
Focused engagement to answer one strategic decision — should we migrate platforms, should we go headless, should we launch on Amazon, should we take on inventory financing. $5,000-$25,000 fixed price. Output: memo or deck with recommendation, supporting analysis, and 90-day implementation plan. Best for one-time decisions with meaningful downside risk.
Fractional executive (monthly retainer, 3-12+ months)
Senior operator embedded 5-15 hours per week as fractional CFO, CMO, CTO, or COO. $5,000-$20,000/month. Output: ongoing decision-making capacity plus quarterly board or leadership deliverables. Best for stores $2M-$25M annual revenue that need executive judgment but can't justify a full-time hire yet. Typical engagement runs 12-24 months before either graduating to full-time hire or transitioning to advisory.
Advisory retainer (monthly retainer, ongoing)
Ongoing advisor-on-call relationship — 2-6 hours per month of the consultant's time, plus asynchronous access. $1,500-$8,000/month. Output: strategic thinking partnership without the full-time-team involvement of fractional executive work. Best for founders who need someone to think with, not someone to execute.
Project consulting (fixed price plus phased retainer, 3-12 months)
Larger consulting engagement wrapping around a major decision — replatforming, international expansion, acquisition, financing round. $25,000-$250,000+ across multiple phases. Output: end-to-end guidance from initial diagnostic through implementation. Best for major inflection points where the wrong decision costs six or seven figures.
The most common mistake is buying a strategy sprint when what's needed is an audit, or buying a fractional executive when what's needed is a strategy sprint. A good consultant will tell you which engagement model actually fits your situation — if the pitch starts with "let's put you on our $10K/month retainer" without diagnosing what you need first, that's a signal to look elsewhere.