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"Your profit is made at the purchase — but it's protected by the estimate. Get the rehab scope wrong and you'll give every dollar back to your contractor."
Every new flipper makes the same mistake: they find a distressed property, get excited, and make an offer before they really know what the rehab will cost. Then the contractor walks through and delivers a number that makes their deal math fall apart entirely.
The solution isn't to always get a contractor bid before you offer — that takes 1–2 weeks and kills your speed in competitive markets. The solution is to develop your own reliable estimation system so you can quickly scope a property, build a realistic budget, and make an informed offer on the same day you walk through.
This guide gives you that system — and tells you exactly when you do need a contractor involved before finalizing your numbers.
1Why Contractor Bids Aren't Always Your First Step
Getting a contractor to bid a property before you make an offer sounds responsible. In practice, it creates three problems:
⚡ Speed kills deals
In active markets, a desirable distressed property may get 3–5 cash offers within 48 hours of hitting the market. Waiting for a contractor's schedule means waiting 5–14 days — and missing deals consistently.
⚡ Contractors bid to win jobs, not to be accurate
A contractor who wants the job may underbid to get selected. A contractor who doesn't want the job (or is too busy) may overbid. Neither gives you a reliable planning number.
⚡ You can't scale without your own estimates
Once you're evaluating 10–20 properties per month, getting individual contractor bids on each one isn't feasible. Experienced flippers can walk a property and generate a reliable budget within 30 minutes.
2The Room-by-Room Estimation Method
Walk through each room with a legal pad or your phone's notes app. For each space, assess the same four categories: floors, walls/ceilings, fixtures/hardware, and systems. This systematic approach ensures you don't miss anything.
🍳 Kitchen
- Cabinets (paint, replace, or full gut?)
- Countertops (laminate vs. quartz vs. granite)
- Appliances (include or replace?)
- Flooring
- Plumbing under sink
- Electrical outlets (GFCI required)
🚿 Bathrooms
- Toilet, vanity, mirror
- Shower/tub (tile, surround, or liner?)
- Flooring (tile or vinyl plank)
- Exhaust fan
- GFCI outlets
- Sub-floor damage from leaks (probe around tub edges)
🛏️ Bedrooms & Living Areas
- Flooring (refinish hardwood? Replace carpet?)
- Walls/ceilings (patch, skim coat, or full drywall?)
- Closet doors and hardware
- Windows (operational? Broken seals?)
- Trim and baseboards
⚡ Systems (Whole House)
- HVAC age and condition (anything 15+ years → budget replacement)
- Electrical panel (Federal Pacific or Zinsco → mandatory upgrade)
- Plumbing material (galvanized → budget re-pipe)
- Water heater age
- Roof condition and remaining life
- Foundation (any visible cracks, sticking doors?)
🏠 Exterior
- Siding condition and paint
- Trim and fascia boards
- Gutters and downspouts
- Driveway and walkway
- Landscaping scope
- Deck or patio condition
3Cost Ranges for Common Rehab Items
These are national median ranges from mid-2026. Costs vary 20–40% by market — use these as a starting framework and calibrate to your local market after your first 2–3 jobs.
| Item | Budget | Mid-Range | High-End |
|---|---|---|---|
| Full kitchen remodel (200 sf) | $8,000 | $18,000 | $35,000+ |
| Bathroom remodel | $3,500 | $7,500 | $15,000+ |
| Flooring (per sq ft, installed) | $2–3 | $4–6 | $8–12+ |
| Interior paint (per room) | $300 | $500 | $800+ |
| Roof replacement (per sq) | $350 | $500 | $750+ |
| HVAC system (3-ton central) | $4,500 | $6,500 | $9,000+ |
| Electrical panel upgrade | $2,000 | $3,500 | $6,000+ |
| Water heater replacement | $1,000 | $1,500 | $2,500+ |
| Windows (per unit, installed) | $350 | $600 | $1,100+ |
| Exterior paint (1,500 sf home) | $2,500 | $4,500 | $7,500+ |
4The Contingency Rule (and Why 10% Is Never Enough)
Every experienced flipper builds a contingency buffer into their budget. The standard advice is "add 10%." The reality: 10% is rarely sufficient, especially for older properties or first-time flippers.
10–15%
Light cosmetic rehab (new construction 1990+)
15–25%
Full rehab (1960–1990 construction)
25–40%
Major structural or gut rehab
The most common sources of budget blowout: hidden water damage discovered during demo, old galvanized plumbing that must be replaced once walls are open, asbestos or lead paint requiring remediation, and permit requirements that weren't anticipated. Always build in more than you think you need.
5Red Flags That Blow Budgets
These are the items that turn a $35k rehab into a $70k rehab. Spot them early or price them in:
Soft sub-floor near bathrooms or under carpet
Water damage under tile or carpet is invisible until demo. One bad bathroom can add $3,000–$8,000.
Federal Pacific or Zinsco electrical panels
These are fire hazards and must be replaced. Budget $3,000–$6,000 for a full panel upgrade.
Galvanized steel plumbing
Galvanized corrodes and restricts water pressure over 40+ years. A full re-pipe on a 1,500 sf house runs $5,000–$12,000.
Roof age 20+ years
Lenders won't finance buyers on a dying roof. Budget full replacement — $10,000–$18,000 on most single-family homes.
Popcorn ceilings in pre-1978 homes
Asbestos testing and remediation can add $1,500–$5,000 depending on scope.
'Handyman specials' with unpermitted work
Unpermitted additions or electrical work may need to be torn out and redone to pass inspection. Always check permit history.
6When to Bring in a Contractor
Your self-estimate is your initial filter. Once you've decided a property makes sense at your offer price, there are situations where getting a professional scope before you close is worth the time:
📋 Situation: Foundation concerns
→ Always get a structural engineer report ($350–$600). Never rely on a contractor's opinion on foundation.
📋 Situation: Major systems that could require full replacement
→ Have an HVAC tech assess the system ($100–$200 service call) and a licensed electrician evaluate the panel if it's old.
📋 Situation: Scope exceeds $100,000
→ For large rehabs, get 2–3 contractor bids before closing. The time investment is justified by the dollars at stake.
📋 Situation: You're in a new market
→ Labor costs vary dramatically by city. Your first 2–3 projects in a new market should include contractor validation of your estimates.
7The Pre-Offer Walkthrough Checklist
Print this or use it on your phone during every walkthrough. Fill it out before you leave the property — not from memory back at your office.
📋 Quick Scope Checklist
☐ Roof — age, condition, visible damage
☐ Foundation — visible cracks, sticking doors
☐ Electrical panel — brand, amperage, condition
☐ HVAC — age, brand, working?
☐ Water heater — age, size, fuel type
☐ Plumbing material — copper, PVC, or galvanized?
☐ Kitchen scope — cosmetic, partial, or full gut?
☐ Bathrooms (each) — scope and sub-floor condition
☐ Flooring throughout — type and condition
☐ Windows — operational, broken seals?
☐ Exterior — siding, paint, gutters, driveway
☐ Permit history — check county records
☐ Red flags noted
☐ Total estimate range + contingency
💡 Pro Tip: Track Every Estimate vs. Actual
After every completed flip, compare your pre-offer estimate to the actual final cost. Over 5–10 deals, you'll identify where you consistently underestimate (usually mechanical systems) and where you're accurate. This feedback loop is how experienced flippers develop reliable instincts.
Jake Martinez
House Flipper · 890 posts · REICommunity Contributor
Jake has completed 47 flips across Texas, Tennessee, and Ohio over 8 years. His average profit per flip is $38,000. He's known in the REICommunity Flipping forum for his detailed scope-of-work templates and contractor management strategies.
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