Investment Metrics for Builders

A few simple numbers tell you whether a deal works.

For a flip or spec

• Profit = sale price − (purchase + construction + carrying + selling costs).
• Watch carrying costs (interest, taxes, insurance while you hold) — they eat profit.

For a rental (hold)

• Cash flow = rent − all expenses − loan payment.
• Cap rate = net operating income ÷ value.
• Cash-on-cash return = annual cash flow ÷ the cash you put in.

The rule

Know your numbers before you buy or build — and build in a margin for surprises. If it only works perfectly, it doesn't work.

Going Deeper (Intermediate)

Evaluate deals with the right metric for the question: NOI, cap rate, cash-on-cash, GRM, DSCR, IRR, equity multiple, and for flips/development, profit margin and ROI.

Advanced / Pro-Level

What each tells you (and its limits):

• NOI = income − operating expenses (before debt).
• Cap rate = NOI ÷ price — the unleveraged yield and how the market prices risk.
• Cash-on-cash = pre-tax cash flow ÷ cash invested — the leveraged cash return.
• DSCR = NOI ÷ debt service — the lender's test (≥ ~1.25).
• IRR vs. equity multiple — time-weighted vs. total return.
• For development, yield-on-cost vs. exit-cap spread and profit margin.
• Garbage assumptions = garbage metrics — stress-test the inputs.

Practice Challenge

A lender says your deal's DSCR is 1.10 and they require 1.25. What does that mean and what are your options? (Answer: NOI only covers debt service 1.10× — too thin a cushion for the lender (they want 1.25×); options: borrow less (lower the debt service), raise NOI, or put in more equity so income comfortably covers the payments.)

In Practice

A flipper forgets carrying costs — interest, taxes, insurance while holding — and the 'profit' evaporates. Run all the numbers, including time, before you buy.

Common Mistakes to Avoid

• Forgetting carrying costs
• Optimistic resale or rent numbers
• Leaving no margin for surprises

Takeaway: Run the numbers before you commit: profit (minus carrying costs) for flips, and cash flow / cap rate / cash-on-cash for rentals.

Educational content — not financial or investment advice. Run real numbers with your CPA and lender, and verify apprenticeship details with the program/sponsor.