Before you make an offer on any property, you need to know exactly what you’re buying. Analysis is the difference between a profitable deal and a money pit. Experienced investors spend far more time performing property analysis than they do making offers [citation:1].

The analysis process has two phases: pre-offer due diligence (before you submit a price) and post-offer due diligence (after the seller accepts, during your contingency period). This page focuses on the pre-offer phase — the work that determines whether you make an offer at all, and at what price.

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Phase 1: Market Research — Know Your Neighborhood

Experienced investors don’t search everywhere. They focus on a specific location — a handful of neighborhoods or ZIP codes they know exceptionally well [citation:1].

What to Research

• Local home values: Recent sale prices for similar properties
• Rental demand: Vacancy rates, average rents, tenant turnover
• Neighborhood trends: Is the area improving, stable, or declining?
• School districts: Critical for attracting retail buyers and quality tenants
• Future development: New businesses, infrastructure projects, zoning changes [citation:1]

Key insight: Instead of asking “Is this a good deal?” experienced investors ask “How does this compare to every other property I’ve seen in this neighborhood over the past year?” [citation:1]

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Phase 2: Property Condition — Identify Problems Before They Cost You

Many experienced investors know that appearances can be deceiving. Before closing, they conduct extensive due diligence to uncover potential issues [citation:1].

Pre-Offer Inspection Checklist

Item	What to Look For
Roof	Age, missing shingles, leaks, sagging
Foundation	Cracks, settling, water intrusion signs
HVAC	Age, functionality, service records
Plumbing	Leaks, water pressure, pipe material
Electrical	Panel condition, exposed wiring, outlet covers
Water Intrusion	Stains, mold, drainage issues
Windows/Doors	Condition, energy efficiency, broken panes

Source: TrustETC

Big-ticket items matter most: Roof, windows, and HVAC systems are the most expensive parts of a house to fix. If you can spot these costs early, you can adjust your offer price to preserve your profit margin [citation:15].

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Phase 3: Estimating Repair Costs

Rehab costs can make or break the profitability of a deal. Accuracy is key — underestimating costs shrinks your profit, while overestimating could make you pass on a viable deal [citation:2].

How to Estimate Repairs

1. Break your budget into line items: Don’t use a lump sum. List every repair by category [citation:2]
2. Get contractor quotes when possible: For major items, bring a contractor to the property before you make an offer [citation:2]
3. Add a contingency buffer: 10-15% for unexpected issues like mold, structural damage, or code upgrades [citation:2]
4. Use local cost data: Repair costs vary significantly by region. What costs $5,000 in one market might cost $12,000 in another [citation:3]

Common Repair Categories

Category	Typical Scope
Cosmetic	Paint, flooring, fixtures, landscaping
Mechanical	HVAC, plumbing, electrical
Structural	Foundation, framing, roof
Environmental	Mold, asbestos, lead paint (pre-1978)

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Phase 4: Calculating After-Repair Value (ARV)

After-Repair Value (ARV) is the market value of a property after renovations. It’s the number every flipper chases — your projected resale price [citation:2].

The ARV Formula

How to Find Good Comps

“Comps” are comparable properties — similar homes in the same area that have recently sold in updated condition [citation:2].

Criteria	Guideline
Distance	Within 1 mile for urban/suburban areas
Age	Built within 10 years of subject property
Size	Within 20% of subject’s square footage
Property Type	Single-family to single-family, duplex to duplex
Bed/Bath	Within 1 bedroom/bathroom difference
Sale Date	Within last 6 months (3 months preferred)

Source: New Silver

Example: Four comps average $161 per square foot. Your subject property is 1,440 square feet. ARV = $161 × 1,440 = $232,046 [citation:9].

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Phase 5: The 70% Rule — Your Maximum Allowable Offer

The 70% Rule is a quick filter to determine your maximum offer price. It builds in a profit margin to cover expenses, risk, and unexpected costs [citation:4].

Worked Example

Item	Amount
After-Repair Value (ARV)	$350,000
ARV × 0.70	$245,000
Less: Repair Costs	−$65,000
Maximum Purchase Price	$180,000

Source: New Silver

What the 30% buffer covers: The 70% Rule builds in a cushion for financing costs, closing costs, lender fees, mortgage points, and carrying costs that will reduce your net profit [citation:4].

Important: The 70% Rule is a starting point, not a precision tool. Always confirm your numbers with real market data and detailed cost estimates [citation:2].

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Phase 6: Analyzing Rental Properties

If your strategy is to hold as a rental, different metrics apply. Here are the key formulas:

The 1% Rule (Quick Screen)

Monthly rent should equal at least 1% of the purchase price for a property to have a good shot at generating positive cash flow [citation:5].

Example: $200,000 purchase price × 1% = $2,000 minimum monthly rent [citation:5].

Limitations: The 1% Rule ignores expenses, financing, and market conditions. It works better for small properties in cash-flow markets than for large multifamily in expensive metros [citation:12].

The 50% Rule (Expense Estimate)

Estimate that 50% of gross income will go to operating expenses (insurance, taxes, vacancy, repairs, maintenance, management) — excluding mortgage payments [citation:7].

Example: $2,000 monthly rent × 50% = $1,000 allocated to operating expenses [citation:14].

Cap Rate (Value Metric)

Cap Rate = Net Operating Income (NOI) ÷ Purchase Price

NOI is gross rental income minus operating expenses (excluding mortgage payments and depreciation). A higher cap rate signals higher risk or lower growth expectations; a lower cap rate means a more stable market [citation:6].

Debt Service Coverage Ratio (DSCR)

DSCR = Net Operating Income ÷ Annual Debt Service

Lenders typically want to see DSCR of at least 1.25. This measures whether the property’s income covers the mortgage after expenses [citation:13].

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Phase 7: Pre-Offer Due Diligence Checklist

Before submitting an offer, complete this checklist [citation:8]:

• Study the submarket: Research local trends, school districts, and development activity
• Search the property address and seller: Look for red flags — crime, fraud, liens
• Review seller disclosures: Pay attention to any known issues
• Analyze government documents: Permits, certificates of occupancy, code violations
• Check deferred maintenance: Note any recent capital expenditures or lack thereof
• Evaluate property tax and utility bills: Understand the true carrying costs
• Complete a site visit: Walk the property with a contractor or trusted advisor
• Contact lenders: Begin preliminary underwriting to know your financing options
• Crunch the numbers: Verify the property meets your investment objective

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⚠️ Risk Warnings

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Key Takeaways

• Focus on a specific market: Become an expert in a handful of neighborhoods or ZIP codes [citation:1]
• Estimate ARV using comps: 3-6 similar homes, sold within 6 months, within 1 mile [citation:9]
• Use the 70% Rule as a filter: Max Offer = (ARV × 0.70) − Repair Costs [citation:4]
• For rentals, use the 1% Rule and 50% Rule: Rent ≥ 1% of price; expenses ≈ 50% of income [citation:5][citation:7]
• Build a contingency buffer: 10-15% for unexpected repairs [citation:2]
• Stay disciplined: If the numbers don’t work, walk away [citation:1]

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Disclaimer: This page is for educational and informational purposes only. It does not constitute legal, financial, or tax advice. Real estate investing involves significant risk. Always consult a licensed attorney, CPA, and financial advisor before entering into any real estate transaction.