After-Repair Value (ARV) is the single most critical number in house flipping. ARV determines your maximum offer price, profit ceiling, and financing approval. Misunderstanding ARV destroys flipping businesses; mastering it creates consistent profits. This guide explains ARV calculation and its role in successful deal evaluation.
What is ARV and Why It Matters
After-Repair Value is the estimated sale price of a property after complete renovation to market standards. If a property sells for $950K after full renovation, that's the ARV—regardless of current condition or your renovation costs. ARV matters because it defines your profit ceiling: if actual sale price comes in $50K below estimated ARV, your profit disappears entirely. Overestimating ARV by 10% ($80K on a $800K property) creates unprofitable deals masquerading as opportunities. Underestimating ARV by 10% leaves money on the table. Accurate ARV estimation separates professional flippers from amateurs losing money.
Finding Comparable Sales for Accurate ARV
Professional ARV estimation relies on comparable sales (comps)—recently sold homes in the same neighborhood with similar size, condition, and features. After renovation, your property should be "average" in the neighborhood: not bottom-tier, not top-tier. Identify 3-5 comps sold within last 90 days in the same 93063, 93064, or 93065 zip code. Properties must be similar: comparable square footage (within 10%), similar lot size, similar bed/bath count, similar neighborhood position. Avoid comps that are significantly larger or smaller—a 2,000 SF home doesn't comp to a 1,500 SF home reliably. Average recent comp sale prices to establish ARV range. A well-renovated 1,600 SF home in Stanley Ranch (93063) might have comps at $1.05M, $1.08M, $1.06M, averaging $1.063M ARV.
Adjusting Comps for Property-Specific Factors
Comps require adjustment for specific differences. If your renovation property has an inferior lot (smaller, less private, worse view), reduce ARV 3-7%. If your property will have superior finishes compared to comps, increase ARV 2-5%. Condo or townhome? Apply condo-specific comps, not single-family. Corner lots in some neighborhoods command 2-5% premiums. Pool-equipped homes in Simi Valley command 5-10% premiums. HOA neighborhood vs. non-HOA affects desirability—HOA homes often discount 3-5% despite amenities. Age of comps matters: 2025 comps reflect current market better than 2024; if significant appreciation occurred, 2025 comps yield more accurate projections.
The 70% Rule and Purchase Price Calculation
The 70% rule structures offer prices: Maximum Offer = (ARV × 0.70) - Total Repair Costs. Using our $1.063M example with $160K repairs: Maximum Offer = ($1,063,000 × 0.70) - $160,000 = $743,100 - $160,000 = $583,100. This formula reserves $280,000 for carrying costs, closing costs, and profit—roughly 26% of ARV. On a $600K actual purchase price (slightly above 70% rule), you retain $180,000-$220,000 after all costs. This provides margin for market fluctuations or unexpected repair costs. Never exceed 70% rule without compelling reason; every dollar above this price reduces profit or creates losses when ARV comes in low.
Market Shifts and ARV Confidence
ARV estimates assume market conditions remain stable during your 6-9 month flip. If you estimate ARV in January expecting March sale, market appreciation or deterioration affects results. Conservative flippers reduce ARV estimate 2-5% to account for market uncertainty. If comps show $1.063M ARV in January, estimate $1.010M-$1.040M for later-year sale. This conservatism prevents overextending on purchase price when ARV doesn't materialize. Check comps monthly: if market shifts, reassess ARV and offer strategy.
When ARV Doesn't Support Deals
Not every property works. A property needing $200K repairs in neighborhood with $900K ARV cannot generate profit—70% rule suggests $430K maximum offer, but seller won't accept that. Walk away. Properties requiring excessive specialization (luxury renovations in average neighborhoods, or vice versa) may not achieve projected ARV. A modern luxury kitchen in a modest $850K neighborhood home may not increase value proportionally. Conversely, average bathrooms in luxury $1.4M homes sell under market. Align renovation scope with neighborhood expectations and ARV potential. If numbers don't support profitable acquisition, protect your capital by declining the deal.
