How to Estimate Repair Costs for Investment Properties
A repair estimate (also called a rehab estimate or scope of work) is a detailed breakdown of the costs required to renovate a property to a target condition level. In real estate investing, accurate repair estimation is one of the three pillars of deal analysis, alongside ARV and the MAO calculation. Underestimate repairs and your flip loses money. Overestimate and you'll never get a deal under contract because your offers will be too low.
Repair estimates are organized by category (kitchen, bathrooms, flooring, roof, HVAC, etc.) and vary based on the level of renovation being planned. A cosmetic refresh costs $10-$20 per square foot. A moderate rehab runs $25-$45/sqft. A full gut renovation can exceed $60-$100/sqft. Knowing which level a property needs -- and accurately estimating the cost for that level -- is what separates profitable deals from money pits.
Repair categories
Every repair estimate should be broken down into categories. This makes the estimate verifiable, helps you get accurate contractor bids, and gives your buyers confidence that the numbers are real rather than a single lump sum pulled from thin air.
Structural
Foundation repairs ($3,000-$15,000+), framing work, load-bearing wall modifications, and structural engineering. These are the most expensive surprises because they're often hidden until demolition begins. Always inspect the foundation carefully and look for signs of settling, cracks, or water intrusion.
Roof
A full roof replacement on a typical single family home runs $8,000-$15,000 depending on size and material. Patch repairs are $500-$3,000. If the roof is more than 20 years old or shows signs of multiple layers, sagging, or active leaks, budget for a full replacement.
HVAC
A new HVAC system (furnace and AC) runs $5,000-$10,000 installed. Ductwork repairs or replacement add $2,000-$5,000. If the system is working but old (15+ years), budget for replacement. Buyers and appraisers will flag an old system even if it's currently functional.
Plumbing
A full re-pipe runs $4,000-$10,000 depending on house size and pipe material. Individual fixture replacements are $500-$2,000 each. Galvanized steel or polybutylene pipes should be flagged for full replacement. Sewer line issues can add $3,000-$8,000.
Electrical
A full panel upgrade and rewire runs $5,000-$15,000. Panel upgrade alone is $1,500-$3,000. If the house has Federal Pacific or Zinsco panels, knob-and-tube wiring, or aluminum wiring, budget for a full upgrade. These are safety issues that also affect insurability.
Kitchen
A standard investor-grade kitchen remodel (new cabinets, countertops, appliances, backsplash, sink, faucet) runs $8,000-$20,000 depending on size and finishes. High-end flips with custom cabinets and quartz countertops can reach $25,000-$40,000. The kitchen is the highest-impact renovation for resale value.
Bathrooms
A full bathroom remodel (new vanity, toilet, tub/shower, tile, fixtures) runs $4,000-$10,000 per bathroom. A simple update (new vanity, toilet, paint, hardware) is $1,500-$3,000. Budget for at least updating the master bath and main hall bath in most flip projects.
Flooring
Luxury vinyl plank (the standard for investor-grade rehabs) runs $3-$5/sqft installed. Tile is $5-$10/sqft installed. Hardwood refinishing is $3-$5/sqft. Carpet (bedrooms only in most markets) is $2-$4/sqft installed. For a 1,600 sqft house, full flooring replacement is typically $5,000-$12,000.
Paint
Interior paint for a standard single family home runs $3,000-$6,000 for a full repaint (walls, ceilings, trim, doors). Exterior paint adds $3,000-$8,000 depending on the size and condition of the siding. Paint is one of the highest-ROI improvements and should be included in virtually every rehab.
Windows
Window replacement runs $300-$700 per window installed. A house with 15 windows could cost $5,000-$10,000 for full replacement. If windows are functional, single-pane, and not rotting, consider leaving them for rental rehabs. For flip rehabs in competitive markets, new windows add perceived value.
Exterior and landscaping
Siding repair or replacement ($5,000-$15,000), driveway ($3,000-$8,000), fencing ($2,000-$5,000), and basic landscaping ($1,000-$3,000). Curb appeal matters for flips. For rentals, functional is sufficient.
Per-square-foot rules of thumb
When you need a quick estimate before a detailed walkthrough, per-sqft rules provide a reasonable starting point:
| Renovation Level | Cost/sqft | What It Includes |
|---|---|---|
| Cosmetic | $10-$20 | Paint, flooring, fixtures, cleaning, minor repairs |
| Moderate | $25-$45 | Cosmetic + kitchen, bathrooms, some systems updates |
| Full renovation | $45-$75 | Moderate + all systems, structural, down to studs in some areas |
| Full gut | $75-$120+ | Everything torn out, complete rebuild of interior |
For a 1,600 sqft house: cosmetic = $16,000-$32,000, moderate = $40,000-$72,000, full renovation = $72,000-$120,000. These ranges are wide because costs vary significantly by market, contractor availability, and material choices. Use them for initial screening, then refine with a detailed category-by-category estimate.
Light rehab vs. full gut
The level of renovation depends on the property's current condition, the target buyer/tenant, and the economics of the deal.
Light/cosmetic rehab works when the structure, systems, and layout are sound but the finishes are dated. New paint, flooring, fixtures, and cleaning can transform a property's appearance for $15,000-$30,000. This is the most profitable renovation type because the cost is low relative to the value added.
Full gut is required when the property has major structural issues, outdated or dangerous systems (old electrical, galvanized plumbing, non-functional HVAC), or a layout that doesn't work for modern buyers. Gut renovations are expensive and time-consuming, but they can also produce the largest absolute profit on high-ARV properties where the condition discount is steep.
For rental properties, the renovation level is typically lower. Tenants care about functionality more than premium finishes. A moderate rehab with durable, landlord-grade materials (LVP flooring, laminate countertops, standard fixtures) often makes more economic sense than a full flip-quality renovation.
Photo-based AI estimation
Traditional repair estimation requires an in-person walkthrough or, at minimum, a set of photos that an experienced investor or contractor reviews manually. AI-powered estimation uses computer vision to analyze property photos, identify condition issues (damaged flooring, outdated kitchens, water stains, aging systems), and generate a category-by-category repair estimate based on the visible condition.
Deal Run's repair estimator analyzes property photos using AI that has been trained on thousands of renovation projects. Upload photos of each room, and the system identifies what needs repair, classifies the condition level, and generates estimates for three exit strategies (flip, rental, and wholesale). You can adjust individual categories, and the system remembers your market-specific cost preferences over time.
AI estimation is not a replacement for a contractor's bid, but it gives you a fast, reasonable estimate that's good enough for initial deal screening and marketing package preparation. Refine with actual contractor quotes before committing to a purchase.