Rehab Cost Estimator

Most rehab budgets are fiction. Not because investors are bad at math, but because they build budgets from contractor bids that are wrong before the first hammer swings. A contractor who bids $35,000 on a kitchen gut is telling you what the job costs if nothing goes wrong. Something always goes wrong. This rehab cost estimator forces you to price every line item individually, add a real contingency, and check the total against after-repair value before you commit a dollar. The goal is a budget that survives contact with reality.

Why contractor bids lie (and what to do about it)

Contractors bid to win work. That means their number reflects the best-case scenario: clean demo, no surprises behind walls, permits that sail through, and materials at today's price locked in for the project duration. In practice, a 2024 NAHB survey found that remodeling projects exceeded initial estimates by an average of 16%. On older properties, the overrun climbs to 25% to 35%.

The fix is not to avoid contractors. It is to treat their bids as raw inputs, not finished answers. Get three bids minimum for every major category. Write a detailed scope of work document before you request bids so every contractor is pricing the same job. Specify materials, finish levels, fixture models, and who pulls permits. When bids come back 40% apart, the scope of work was not specific enough.

Line-item cost ranges by category

Every rehab breaks down into the same categories. The range within each category is enormous because finish level drives cost more than scope. A kitchen with stock cabinets and laminate counters is a different project than one with custom cabinetry and quartz. Here are realistic ranges for single-family investment properties:

For a typical fix-and-flip targeting the median price point, most of your budget sits in the mid-range column. High-end finishes only make sense when the ARV supports them and the neighborhood comps confirm buyers pay a premium for upgraded materials.

Regional cost variations: same job, different price

Labor is 40% to 60% of total rehab cost, and labor rates vary dramatically by market. The same 1,200 sq ft gut renovation costs wildly different amounts depending on where the house sits:

A kitchen gut that costs $22,000 in Memphis runs $38,000 to $45,000 in San Francisco for the same cabinets, countertops, and appliances. If you flip in multiple markets, never carry a single per-square-foot number in your head. Rebuild the budget from local labor rates every time. Your BRRRR calculator numbers only hold if the rehab line reflects local pricing.

The contingency rule: how much buffer is enough

Contingency is not a line item for "things might go wrong." It is a line item for "things will go wrong, and here is the money to pay for them." The question is how much.

• 10% to 15% contingency: Properties built after 1980 with a clean inspection, no visible structural issues, and a scope limited to cosmetic updates. The unknowns are small: subfloor damage under carpet, a shower valve that needs replacing, a slightly bigger dumpster run.
• 15% to 20% contingency: Properties built 1950 to 1980 with mixed-age systems. You might find galvanized plumbing that needs replacement, old insulation with asbestos, or an electrical panel that does not meet current code. Each of these discoveries adds $3,000 to $8,000.
• 20% to 25%+ contingency: Pre-1950 homes, properties vacant more than 12 months, any house where the previous owner did unlicensed renovation work. These properties routinely hide problems that triple individual line items. Knob-and-tube wiring behind plaster walls. Lead paint under seven layers. Foundation settling that only shows once you pull up the floor.

New investors consistently under-budget contingency because they view it as waste. Experienced flippers view contingency as the most honest line in the budget. If you do not use it, the money stays in your pocket. If you do, the project stays on track.

Cosmetic vs. structural rehab: different risk profiles

Cosmetic and structural rehabs are different businesses wearing the same label. A cosmetic rehab ($10K to $30K) covers paint, flooring, fixtures, countertops, cabinet refacing, and landscaping. No permits in most jurisdictions. Timeline of 2 to 4 weeks. Budget variance is low because you can see everything before you start. A 1,400 sq ft ranch in Charlotte, NC needing paint ($3,500), LVP flooring ($5,000), fixtures ($2,000), countertops ($3,500), and landscaping ($1,500) runs $15,500 plus 10% contingency = $17,050 working budget.

A structural rehab ($40K to $100K+) involves roof, foundation, full electrical, plumbing, HVAC, and load-bearing changes. Permits required. Timeline of 2 to 4 months minimum. A 1,600 sq ft bungalow in Cleveland needing a new roof ($11,000), full rewire ($9,000), repipe ($7,000), HVAC ($8,500), kitchen gut ($25,000), and two bathroom guts ($16,000) runs $76,500 plus 20% contingency = $91,800. The profit potential is higher, but so is the risk of a budget blowout. If you are running your first flip, start cosmetic. The tuition on structural mistakes is expensive.

ARV is your spending ceiling

After-repair value sets the absolute limit on what you can spend. The 70% rule gives you the formula: maximum purchase price plus rehab should not exceed 70% of ARV. That 30% margin covers your profit, selling costs, and holding costs.

On a property with a $300,000 ARV, your all-in cost caps at $210,000. If you bought at $155,000, your rehab budget ceiling is $55,000 including contingency. Spend $62,000 and you are working for free after selling costs. Spend $70,000 and you are losing money. The 70% rule is blunt, but it keeps you from the most common mistake in flipping: spending into your profit.

This is where a rehab cost estimator earns its keep. You can move sliders and watch the total climb toward your ceiling in real time. If the kitchen alone puts you over budget, you know before you sign the purchase contract, not after demo day.

Worked example: $200K purchase, $45K rehab, $280K ARV

A 3-bed / 2-bath ranch in a B+ neighborhood in Jacksonville, FL. Purchased for $200,000. Comps support an ARV of $280,000 after renovation. Here is the line-item budget:

The 70% rule check: $280,000 ARV × 70% = $196,000 max all-in. Purchase ($200,000) + rehab ($51,750) = $251,750 all-in. That exceeds the 70% threshold by $55,750. This deal only works if you bought under market (off-market, auction, motivated seller) or if you are comfortable with a thinner margin. At these numbers, the realistic profit after 6% selling costs ($16,800) and holding costs is roughly $11,000 to $15,000. Tight, but not dead.

Holding costs during rehab: the budget line everyone forgets

Rehab budgets track renovation costs. They rarely track what the property costs you while the work happens. Every month you hold, you are paying loan interest (hard money at 12% on $200,000 = $2,000/month), insurance ($150 to $400/month for builder's risk), utilities ($200 to $350/month), property taxes (prorated, roughly $250/month on a $200,000 property at 1.5%), and possibly lawn care or security ($100 to $200/month).

Total monthly carry on the Jacksonville example: roughly $2,800 to $3,200. A 4-month rehab adds $11,200 to $12,800 in costs that never show up in a simple renovation budget. Every extra month is $3,000 you did not plan for. Run the full picture through a fix-and-flip calculator that includes holding costs, not just renovation costs.

How to get accurate contractor bids

The quality of your bids depends entirely on the quality of your scope of work. A vague request gets a vague answer. A detailed, room-by-room scope document gets a number you can hold the contractor to.

• Write a scope of work document. Specify cabinet grade, countertop material, flooring type, fixture allowances, paint finish. Include who pulls permits, who hauls debris, and who does final cleaning.
• Get three bids on the same scope. If one bid is 50% below the others, that contractor either missed something or plans to change-order you back up.
• Check references on completed rehabs. Ask for three finished flips or rental renovations. Call those investors about budget accuracy, timeline accuracy, and communication.
• Set a payment schedule. Never pay more than 10% upfront. Structure draws around completed milestones: demo, rough-in, drywall, punch-list. A contractor who demands 50% upfront is waving a red flag.

Common rehab budget mistakes

These errors cost investors thousands per project. All of them are avoidable.

• No contingency or under 10%. A $50,000 rehab with zero buffer is a $57,000 to $62,000 rehab in disguise.
• Using national averages.A bathroom "averages $12,000 nationally" tells you nothing about your zip code. Get local bids.
• Forgetting permit costs. In a regulated city, permits and inspections add $2,000 to $5,000 to the project.
• Ignoring holding costs. Every extra month adds $2,000 to $4,000 in carry. A 2-month overrun is $6,000 gone.
• Overimproving for the neighborhood. $15,000 in kitchen upgrades where comps cap at $180,000 means the market will not pay you back.
• Skipping the inspection. A $400 inspection surfaces problems that become $5,000+ change orders after demo.
• One bid from one contractor. That $22,000 kitchen bid might be $16,000 from the next guy. You need three.
• No written scope of work. Verbal agreements breed change orders. If it is not in writing, it is not in the budget.
• Paying too much upfront. Never give more than 10% before work starts. Structure draws around milestones.
• Spending past the ARV ceiling. If purchase plus rehab exceeds 75% to 80% of ARV, your margin is gone. Use the 70% rule calculator to set the cap.

Using the rehab cost estimator with your deal analysis

This calculator gives you one piece: total renovation cost with contingency. To see whether a deal works, plug the number into the rest of your analysis. Flipping? Take your rehab total into the fix-and-flip calculator to model purchase, holding costs, selling costs, and net profit. Running a BRRRR? Your rehab cost feeds directly into the BRRRR calculator to determine how much capital the refinance returns. Buying to hold? Run the post-rehab numbers through the cash flow calculator to confirm the property still cash flows after the capital invested in renovation. Build the budget here, stress-test it there.