How to Estimate Repair Costs on a Wholesale Deal (Without Being a Contractor)

You do not need to be a contractor to estimate repairs on a wholesale deal. You need a consistent method, a per-square-foot baseline, and the discipline to add a contingency. Your buyer will do their own estimate; yours just has to be close enough that they trust your deal sheet. Here is how to estimate repair costs in five steps, with a worked example and the mistakes that trip up most beginners.

Why your repair number matters so much

Repairs are the second number in the offer formula, right after after-repair value. Every dollar you underestimate comes straight out of your buyer’s profit, and buyers know it. If your estimate is far below theirs, they will either pass or ask for a lower price, and a lower price may be one your seller cannot accept. A repair number that is realistic, itemized, and slightly conservative is what lets a deal assign without renegotiation.

Step 1: Classify the rehab level

Walk the property (or study the photos) and put it in one of three buckets. Per-square-foot numbers below are typical ranges for a working-class single-family house in most U.S. markets; adjust for your area’s labor costs.

• Cosmetic ($15–$25/sq ft): paint, flooring, fixtures, landscaping, minor drywall, appliances. The house is structurally fine and the kitchen and baths are dated but functional.
• Moderate ($35–$55/sq ft): everything cosmetic plus a new kitchen, new bathrooms, and one or two major systems (roof, HVAC, water heater, electrical panel).
• Full gut ($70+/sq ft): down to the studs, all systems, layout changes, possibly foundation or structural work.

A 1,500 sq ft cosmetic rehab runs about $22,000–$37,000. The same house as a moderate rehab is $52,000–$82,000. Start there, then refine.

Treat these ranges as a starting framework, not a price list. Labor and material costs differ a lot between regions and even between neighborhoods, and they change over time. The goal of this step is only to put the house in the right bucket so your first number is in the right neighborhood before you start itemizing.

Step 2: Price the big-ticket items separately

Per-square-foot covers the interior. Five items can blow up any estimate and should be priced on their own:

• Roof: $8,000–$20,000 depending on size and material
• HVAC: $6,000–$12,000 for a full system
• Foundation: $5,000 for minor piers to $40,000+ for serious movement; get a pro opinion
• Sewer line: $4,000–$15,000; older houses with big trees are suspects
• Electrical panel and plumbing repipe: $2,500–$5,000 and $6,000–$15,000 respectively

How to spot the big items on a walkthrough

• Roof: curling or missing shingles, visible sagging, water stains on ceilings, and daylight in the attic. Ask the seller how old it is.
• HVAC: look for the data plate on the outdoor unit and furnace; the manufacture date is often printed there. Units near the end of their service life should be budgeted for replacement.
• Foundation: diagonal cracks above doors and windows, doors that stick or will not latch, sloping floors, and stair-step cracks in exterior brick.
• Sewer: slow drains throughout the house, a history of backups, and large trees near the line. A camera inspection settles it.
• Electrical and plumbing: an old fuse box or a panel brand buyers avoid, ungrounded outlets, and galvanized or mixed supply pipes.

Step 3: Add a contingency

Add 10% to everything on a house you walked and 15–20% on one you only saw in photos. Every experienced buyer does this, and a deal sheet without it tells them you are new.

Contingency is not padding for its own sake. Older houses hide problems behind walls and under floors, and permits, dumpsters, and price changes on materials add up. Showing the contingency as its own line, rather than burying it in each item, makes your estimate easier to read and easier for a buyer to adjust.

Step 4: Sanity-check with a buyer

Send your line-item estimate to one flipper on your A-list and ask if it is in range. They will tell you in thirty seconds, and the correction is worth more than any spreadsheet. Over time, their numbers become your numbers.

If you do not have that relationship yet, start building it now. Our guide on finding cash buyers before your first deal shows how to get those contacts in place, so you have someone to check your numbers before you put a house under contract.

Step 5: How to estimate repair costs line by line

Once you have the bucket and the big items, build a simple line-item sheet room by room. It does not need to be precise to the dollar; it needs to be complete so nothing is missed. A basic structure:

1. Exterior: roof, gutters, siding or paint, windows, doors, landscaping, driveway, fencing.
2. Systems: HVAC, water heater, electrical panel and wiring, plumbing supply and drain lines, sewer.
3. Kitchen: cabinets, counters, appliances, sink and fixtures, backsplash, lighting.
4. Bathrooms: vanity, toilet, tub or shower surround, tile, fixtures, ventilation, per bathroom.
5. Interior finishes: flooring, paint, drywall repair, trim, interior doors, light fixtures.
6. Other: permits, debris removal, cleaning, and anything unusual you saw.

A worked example

These are example numbers to show the method. Your market’s costs will differ.

1. Subject: 1,400 sq ft, three bed, one and a half bath. Dated kitchen and baths, worn carpet, structurally sound. Bucket: cosmetic, using $20/sq ft = $28,000.
2. Big items: the roof shows wear and the seller says it is original, so add $12,000. The furnace is old but running; add $7,000 to replace it because a buyer will.
3. Subtotal: $28,000 + $12,000 + $7,000 = $47,000.
4. Contingency: you walked the house, so add 10% = $4,700.
5. Repair estimate on the deal sheet: about $52,000.

That repair figure then goes into your offer math. Our guide to writing a wholesale offer shows how ARV, repairs, and your fee combine into a maximum allowable offer.

Common repair-estimate mistakes

• Pricing it like a homeowner would. Your buyer is pricing a full resale-ready renovation, not a patch job. Estimate for the finish level that comps in the area show.
• Skipping the systems. A nice-looking house with a failing roof or furnace is not a cosmetic rehab.
• No contingency. Experienced buyers read a zero-contingency estimate as inexperience.
• Estimating from the curb. Exterior photos say little about the kitchen, baths, or systems. Get inside or widen your contingency.
• Never updating your numbers. Costs change. Refresh your cheat sheet whenever a buyer or contractor gives you a better figure.

The repair cheat sheet

Keep a one-page list of unit costs for your market — per-square-foot paint and flooring, per-window replacement, per-fixture bathroom update, kitchen packages at three price points — and update it every time a buyer corrects you. That sheet is what turns a nervous beginner into someone whose offers get taken seriously.

A good way to build it quickly: ask two or three local contractors or flippers for their typical prices on the items above, and note where they agree. When you are out driving for dollars, practice by guessing the rehab bucket for each property you log, then compare your guess with the photos when a house later lists or sells.

Flipper or landlord: estimate for your likely buyer

Not every cash buyer renovates to the same standard. A flipper selling to a retail buyer will usually budget for a full update of the kitchen, baths, and finishes so the house competes with renovated comps. A buy-and-hold investor renting the property out often chooses durable, lower-cost finishes and may leave some dated items in place if they are functional. Know which type of buyer you expect to sell to, and note on your deal sheet which scope your estimate assumes. That one line prevents a lot of back-and-forth.

Walkthrough checklist

• Photos of every room, the roof line, the electrical panel, the water heater, and the HVAC data plates
• Notes on ceiling stains, cracks, sticking doors, soft floors, and odors
• Age of the roof, HVAC, and water heater (ask the seller, then verify)
• Count of windows, doors, bathrooms, and fixtures for your line items
• Rehab bucket, big items, contingency, and total written before you leave

Repair estimate FAQ

Do I need a contractor to walk every property?

No. For most cosmetic and moderate rehabs, a careful walkthrough, your cheat sheet, and a buyer’s sanity check are enough. Bring in a contractor or inspector when you see signs of foundation, sewer, or major electrical issues.

What if my buyer’s estimate is much higher than mine?

Ask which line items differ and why. If they are right, update your cheat sheet. If the gap breaks the deal, you may need to renegotiate with the seller during your inspection period, which is one reason to understand the terms in your wholesale contract.

Can I estimate repairs from photos only?

You can make a first pass from photos, but raise your contingency to 15–20% and confirm the major systems before you commit to a number with a buyer.

Should I show my repair estimate to the seller?

Sharing the main items can help a seller understand why a cash, as-is offer is below retail. Keep it factual and focused on the property’s condition.

A wrong repair estimate is the number one reason a contract does not move. Overestimate slightly. A deal with $5,000 of extra margin still assigns; a deal that is $5,000 short does not.

Working a specific market? Our state-by-state wholesaling guides cover the licensing rules, deed records and probate courts for each state and its major cities.

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