How to Estimate Rehab Costs Without Getting Burned

TL;DR

• Split every rehab into four buckets: kitchen, bath, systems, cosmetic — then price each independently.
• Expect contractor bids to vary by 2–3x on the same scope. The spread is almost always miscommunication, not skill.
• Use per-square-foot sanity checks ($15 light cosmetic, $35 medium, $75+ heavy/gut) before trusting any line item.
• Add a 15% contingency on cosmetic rehabs and 25% on anything that touches plumbing, electrical, or the roof.

Every new flipper blows their first budget. Not because rehab is uniquely cursed — because they treat "rehab cost" as a single number pulled from a YouTube video instead of a stack of line items that each need their own estimate. This guide gives you the framework professionals use, with 2026 price ranges you can plug into underwriting tonight.

Why contractor bids vary 3x on identical scope

You send three contractors to the same 1,800 sq ft house and get bids of $42,000, $78,000, and $121,000. They all walked the same floors. What happened?

• Bid 1 ($42K): Scope was verbal. Contractor assumed you wanted paint, flooring, and a "lipstick kitchen." No cabinets, no electrical, no roof.
• Bid 2 ($78K): Contractor assumed a mid-grade kitchen (new cabinets, quartz), two bath refreshes, HVAC tune-up, and standard cosmetic.
• Bid 3 ($121K): Contractor assumed you wanted to pull permits, open the wall between kitchen and living room, and redo the electrical panel.

None of them are lying. They are all bidding a different project. Your job is to write the scope so precise that any contractor bidding it produces the same number.

The four-bucket method

Every residential rehab decomposes into four categories. Price them independently and add them up.

1. Kitchen

The kitchen alone can swing a flip budget by $25K. Typical 2026 ranges:

• Lipstick refresh (paint cabinets, new hardware, new laminate counters, new appliances): $6,500 – $11,000
• Mid-grade remodel (new stock cabinets, quartz counters, tile backsplash, stainless suite): $18,000 – $28,000
• Gut-and-reconfigure (layout change, new island, semi-custom cabinetry): $40,000 – $70,000+

If your ARV comps show homes with white shaker cabinets and quartz, the lipstick refresh will cost you resale — buyers notice. Match the finish level of your ARV comps, not one tier below.

2. Bath

Per bath, full remodel:

• Refresh (new vanity, toilet, fixtures, reglaze tub, new flooring): $3,500 – $6,500
• Full tile remodel (new tub/shower surround, tile floor, new vanity): $9,000 – $16,000
• Primary suite spa (walk-in shower, double vanity, freestanding tub): $22,000 – $38,000

Multiply by number of baths. A 3-bath flip at mid-tier = $27K – $48K just on baths.

3. Systems (the budget killer)

Systems are invisible and therefore the most underestimated category:

• Roof (asphalt shingle, 1,800 sq ft): $9,000 – $16,000
• HVAC (full replace, SEER 14–16, heat pump): $7,500 – $14,000
• Electrical panel (200-amp upgrade): $2,800 – $5,500
• Full rewire: $8,000 – $20,000 depending on plaster walls
• Sewer line replacement: $5,000 – $18,000 (trenchless is cheaper)
• Water heater: $1,400 – $3,200 (tankless $3,500 – $6,000)

If the house is 40+ years old and you cannot confirm these were replaced, assume at least two of them need it. Budget accordingly before you offer.

4. Cosmetic (the most over-estimated category)

• Interior paint (walls, ceilings, trim, 1,800 sq ft): $4,500 – $8,000
• Exterior paint: $3,500 – $8,500
• LVP flooring installed: $3.50 – $6.00/sq ft
• Refinish existing hardwood: $2.50 – $4.50/sq ft
• Landscape refresh (sod, 5 shrubs, mulch beds): $1,800 – $4,500

Cosmetic is where inexperienced investors pad the budget because it feels visible. In reality, cosmetic is the cheapest part of any rehab. The systems bucket kills deals, not paint.

Per-square-foot sanity check

Sum your four buckets, then divide by livable square footage. Compare against these 2026 benchmarks:

• $15–20/sq ft: Paint, flooring, minor fixture swaps. No kitchens, no baths.
• $30–45/sq ft: One kitchen refresh, one bath, paint and flooring throughout, basic landscape.
• $60–85/sq ft: Kitchen remodel, 2 baths, HVAC or roof, full cosmetic.
• $100–150/sq ft: Gut rehab, all systems, permits, structural.
• $200+/sq ft: Down-to-studs rebuild, additions, foundation work.

If your per-sq-ft number does not match the per-sq-ft story, one of them is wrong. Rebuild the estimate before you sign anything.

How to decode vague quotes

Bids fall apart on four words: standard, allowance, as needed, and misc. Every one of these is a wormhole.

• "Standard vanity": At which store? Home Depot? Wayfair? Restoration Hardware? Attach a SKU.
• "$3,000 allowance for flooring": For materials? Labor? Both? For the whole house or just living areas?
• "Electrical updates as needed": The contractor decides what is needed after demo, which means the number is not a bid — it is a blank check.
• "Misc. $5,000": This is a contingency embedded in the bid. Reject it. Your contingency is yours.

Ask every contractor for a line-item SOW with SKUs, quantities, and labor/material split. If they will not give you one, you are not working with the right contractor for a fixed-price rehab.

Contingency: the number you hope to not spend

On a clean cosmetic rehab, add 10–15% contingency. On anything opening a wall, touching the roof, or involving old plumbing, add 20–25%. If you skip contingency, you are betting the entire deal against a 25% probability that nothing goes wrong. That is a bet you will lose.

Walk the property with a trained eye

Most rehab blowups trace back to a bad walkthrough. You missed the stair-step crack in the foundation, the water stain on the ceiling, the panel with aluminum wiring. A 90-minute walkthrough catches 80% of the surprises. Learn what to look for in 12 Things During a Walkthrough That Signal Foundation Problems, and learn why holding costs multiply the impact of every week of surprise in The Real Holding Costs of a Flip.

Let software catch what your eye missed

Manual walkthroughs work, but you will forget things. Vricko's Walkthrough AI lets you photograph a room, annotate damage and scope, and get a rehab estimate line-by-line against current local labor and material pricing. The bucketing is built in, per-sq-ft sanity checks are automatic, and the output becomes the SOW you hand to contractors — so every bid comes back on the same scope.

Stop guessing what a rehab will cost. Try Walkthrough AI on your next property and bid contractors against a scope they cannot redraw.