Cost Plus Contract Explained: 3 Types + California Law

About this episode

Bill Reid explains the intricacies of cost plus contracts, their types, and the implications of California law on homeowners.

A cost plus contract means your contractor gets reimbursed for every project cost plus a profit margin — but it comes in three flavors, and the structural differences determine who carries the financial risk. Download Your Free Cost-Plus Reality Check Tool Bill Reid explains cost plus percentage (most dangerous for homeowners), cost plus fixed fee (better protection), and cost plus with guaranteed maximum price (safest hybrid). You'll discover why California banned pure cost plus contracts for residential remodels under Business and Professions Code 7159.5, the industry-standard markup range (15-25%, or $75K-$125K on a $500K project), and the five drift triggers that push projects into cost plus territory. Bill shares seven critical questions to ask yourself before signing, the narrow band of homeowners for whom cost plus genuinely works, and why disaster rebuilds almost always require this structure. This is part one of a two-part series — the decide episode. Episode 57 next week covers tactical execution. Related: Episodes 50, 53. Section 3.202 of The Awakened Homeowner book. Free download: Tale of Two Homeowners story + Fixed Price vs Cost Plus micro-tool. BuildQuest beta at…

People in this episode

Host: Bill Reid

Topics covered

• cost plus contracts
• contract types
• financial risk
• California law
• homeowner protection
• construction contracts

Keywords

• cost plus contract
• contract types
• California law
• homeowner risk
• construction markup
• project costs
• financial risk

Mentioned in this episode

Organizations: California, BuildQuest

Products: Cost-Plus Reality Check Tool, Tale of Two Homeowners story, Fixed Price vs Cost Plus micro-tool

Books & works: Business and Professions Code 7159.5

Places: California

More episodes of Your Home Building Coach with Bill Reid

• Change Orders: The $15K Surprise & How to Stop It · June 6, 2026 · 27 min
• Construction Contract Basics: What to Check Before You Sign · May 30, 2026 · 25 min
• Fixed Price Contracting: 4 Components That Decide Your Budget · May 23, 2026 · 39 min
• Cost Plus Contract Protection: The 4-Part System That Saves · May 16, 2026 · 47 min
• Cost Plus vs Fixed Price — Which Contract Protects You? · May 2, 2026 · 42 min
• How to Choose a Contractor — The Scorecard That Gets It Right · April 25, 2026 · 33 min