Flippers do not expect you to be a general contractor. They do expect you to stop saying "$40K should cover it" after a two-minute photo scroll.
Rehab is one of the fastest ways a flip's math falls apart, and one of the first places agents lose credibility. A sloppy guess makes maximum allowable offer look precise when it is not. A careful sketch — categories, assumptions, and a confidence level — helps a flipper decide whether a property deserves a tour, a contractor bid, or a pass.
This guide is for licensed agents who work with fix-and-flip clients. It is education, not a license to invent construction pricing.
Your Job Is a Sketch, Not a Bid
Keep three documents separate:
- An agent's rehab sketch. A structured range based on what you can see, local finish expectations, and clearly marked unknowns.
- A contractor's bid or scope. Pricing from someone who will do the work, or from the investor's own estimator.
- The final budget. What the flipper chooses to spend after bids, hidden conditions, and design decisions.
You are responsible for the first one. Serious flippers would rather see "kitchen $18K–$25K, roof unknown — need a roofer" than one confident number that later moves by tens of thousands.
Why Rehab Guessing Breaks Trust
Underestimate rehab, and two things follow: the offer goes in too high, because purchase price and rehab share the same pie, and the flipper remembers who sent the rosy memo. Overestimate, and you can talk a client out of a deal that still fit their buy box.
The fix is not a dramatic middle number. Show a range, state your confidence, and flag what you could not verify. Agents who become the go-to call for flippers are rarely the ones with the cheapest guesses. They are the ones whose sketches still make sense after the GC walks the house.
Start With Scope, Then Talk Money
The same 1,400-square-foot house can be a paint-and-flooring job or a full-gut rebuild. Those are not close. Agree on scope before you assign dollars.
- Cosmetic / light: Paint, flooring, fixtures, a modest kitchen and bath refresh, curb appeal. Systems appear serviceable.
- Medium: Cosmetic work plus a real kitchen and/or bath renovation, likely system upgrades, possibly a roof or limited exterior work.
- Heavy / full gut: Down to the studs in large areas, major systems, possible structural work, layout changes, permits, and a longer hold.
Write the scope in a sentence the flipper can agree with: "This looks like a medium rehab: new kitchen and both baths, flooring and paint throughout, and I cannot confirm HVAC or roof from the listing photos." If you do not share a scope, your numbers are not about the same job. For more on that conversation, see cosmetic vs. full-gut rehab.
Walk the House With a Category Checklist
Do not estimate "the rehab." Estimate categories:
- Demo and haul-out
- Structural, foundation, roof, and exterior envelope
- Major systems: electrical, plumbing, HVAC
- Kitchen
- Baths (count them; a second bath is not a rounding error)
- Interior finishes: flooring, paint, trim, doors, lighting, hardware
- Windows and exterior (siding, driveway, landscaping)
- Permits, inspections, and design
- Soft project costs: temporary utilities, security, cleaning, optional staging
- Unknowns and contingency
On the walk — or a detailed video walkthrough — photograph rooms in a consistent order and note what you could not see: attic, crawlspace, under flooring, the roof surface, the panel cover. You are not acting as a home inspector. You are capturing enough detail to build a range and a follow-up list.
Use Confidence Levels on Purpose
Every sketch should carry a confidence tag.
- Photo-only. Lowest confidence. Use wide ranges and a long unknowns list. Good enough to decide whether the lead is worth touring, not good enough for a tight offer.
- Agent walk, no contractor. Better. You have seen rooms, obvious systems issues, and neighborhood finish level. Still flag hidden areas.
- Walked with the investor's GC or estimator. The highest confidence you will usually get pre-contract. Uncovered conditions can still change the budget.
Put the tag in the first line of the rehab section: "Photo-only, medium-scope sketch" tells a disciplined investor how much weight to give the figure.
How to Put Dollars on Categories Without Inventing Expertise
You do not need to invent unit costs. Build a local reference file over time: what categories have actually cost your flipper clients at a given finish level, notes from contractor conversations and permit counters, and the finish standard in recent renovated comps. If your ARV assumes quartz and hardwood, a vinyl-and-builder-grade kitchen sketch will not support it.
When you lack a local data point, say so and give a wide range, or leave the line as "needs bid."
Illustrative math only (not a market average, not a bid, and not a recommendation for a real property):
You walk a 3-bed, 2-bath house and agree the scope is medium. A category sketch might look like this:
- Demo / haul-out: $3,000–$5,000
- Kitchen: $18,000–$25,000
- Two baths: $14,000–$20,000
- Flooring and paint: $10,000–$14,000
- HVAC (replacement likely): $7,000–$11,000
- Electrical panel and scattered updates: $3,000–$6,000
- Exterior paint and landscaping: $6,000–$9,000
- Permits and miscellaneous: $2,000–$4,000
Subtotal range: $63,000–$94,000
Then add contingency on its own line — not quietly baked into the prettiest number.
Contingency Is Part of the Estimate
Contingency is how you admit the house will surprise you. Older homes, tenant-occupied properties, and anything with water staining or homemade electrical work deserve more buffer than a vacant, well-maintained house with open access to systems.
Use the mid or conservative end of your category range as the working subtotal, add a contingency that rises with risk and with how little you have seen, and call out high-risk items (roof, foundation, sewer line, unpermitted additions) as "bid required."
There is no universal percentage that fits every flip. Ask the investor what they want you to model, and note it as their assumption. A bigger job is also a longer hold, which raises holding costs and then lowers MAO.
Tie Rehab to ARV, Buy Box, and MAO
Rehab is never a standalone figure.
- ARV. The finish level in your sketch must support the renovated comps behind after-repair value. A light cosmetic budget cannot borrow the ARV of a fully remodeled comparable. See how to calculate ARV the way flippers expect.
- Buy box. Many investors have a rehab ceiling ("no full guts," "max $40K," "no foundation"). A property can be cheap and still fail the box on scope.
- MAO. Purchase price and rehab compete for the same leftover dollars after profit, selling costs, and hold. A $15,000 miss on rehab is a $15,000 miss on what they can pay.
If a conservative range already blows up MAO, say so early. Telling a flipper the deal does not work — with the category math attached — is more useful than stretching the budget to keep the conversation alive.
The 70% rule is a fast screen, not a substitute for this work. Use it to decide whether a full sketch is worth your time, then estimate rehab in categories before anyone talks offer price.
How to Present the Sketch
Send a short memo, not a spreadsheet dump:
- Scope sentence and confidence level (photo-only, walked, walked with GC).
- Category table with a low–high range, or a working number plus notes.
- What you could not verify.
- Contingency assumption and whose rule it is.
- How the range changes MAO at the low and high ends.
- Recommended next step: pass, tour, get a specific bid, or write an offer with an inspection or renovation strategy the client chooses.
Invite correction: "If your kitchen package runs closer to $15K than $25K, the MAO moves with it — tell me how you usually spec this neighborhood." That tone makes you a partner in the underwrite.
Habits That Keep You Honest
Use the same category checklist every time so sketches are comparable. Keep a private estimated-vs-actual log on deals you stay close to during rehab, with the investor's permission, and never share one client's numbers with another. If you refer contractors, know your brokerage's policy and avoid undisclosed referral fees; see how agents should and shouldn't recommend contractors. Permit and inspection friction belongs in both the timeline and the budget — see permits and inspections agents should track on flips.
Avoid one-number guesses, cutting the rehab line to make a purchase price feel possible, taking the seller's "just needs paint" story as a scope, and ignoring systems because the kitchen is cute. Do not promise a budget, timeline, or profit. You can organize the analysis. You cannot guarantee the renovation.
FAQ
Do I need a contractor bid before I send a rehab sketch?
No. A clearly labeled agent sketch is useful for screening and first-pass MAO. Get bids before anyone treats the number as a final budget, especially on medium or heavy scope, or when a major system is in doubt.
How accurate does an agent's rehab estimate need to be?
Accurate enough to be honest about range and uncertainty. You are not competing with a GC's takeoff. You are trying not to mis-rank the deal. Wide ranges plus listed unknowns beat a precise number you cannot defend.
What if I can only see listing photos?
Say "photo-only," widen the ranges, and list what the photos cannot prove: roof, electrical panel, plumbing, foundation, attic, and anything behind furniture. Use the sketch to recommend a tour or a pass, not a tight offer.
Should I share my flipper's rehab numbers with the listing agent or seller?
Not as a default. Those figures are part of your client's underwriting. Discuss strategy with your investor and follow your duties to the party you represent. Do not turn a private budget into a negotiating leak.
How should I handle a house that might need structural or foundation work?
Do not bury that risk inside a cosmetic total. Mark it as "bid required," widen contingency, and be willing to recommend a pass until a qualified inspector or contractor weighs in.
Who decides the contingency percentage?
The investor, ideally as part of their buy box. Your job is to ask for it, apply it consistently, and note when the property's risk seems higher than their usual buffer.
Soft next step
If you want help installing repeatable deal-analysis habits — rehab sketches, buy-box filters, and honest MAO memos — Flip Engineers coaches agents who want to become the default call for flippers and developers. Book a call.