How to Review a Fix-and-Flip Renovation Budget

For the bid-specific pass, use the house flipper rehab bid checklist before approving the scope or draw schedule.

Why Fix-and-Flip Budgets Fail

Most flips do not fail because the investor forgot to paint a bedroom. They fail because the rehab budget was wrong before the investor closed.

The pattern is familiar:

1. Investor estimates rehab at $45,000.
2. Contractor submits a $41,000 bid.
3. The bid excludes permits, a panel upgrade, HVAC relocation, and realistic tile allowances.
4. Actual cost lands over $51,000.
5. The margin disappears.

Anchor Loans emphasizes the importance of contractor estimates in rehab budgeting. The problem is that a contractor estimate still needs review.

1. Check ARV Alignment

Before line items, check deal math. The renovation budget has to make sense against the after-repair value.

The 70% rule is the common investor guardrail: purchase price plus rehab should stay at or below roughly 70% of ARV. We Lend explains ARV as the value after renovation. If a $300,000 ARV property is purchased for $175,000, a $35,000 rehab keeps the all-in cost at $210,000. A $48,000 rehab breaks the ceiling.

Check: purchase price + contractor bid + contingency. If that total misses the target, negotiate the price, revise the scope, or pass.

2. Check Scope Completeness

Walk the bid against the actual property.

Perrier Esquerre Contractors notes that low bids often hide scope gaps, weak allowances, or aggressive payment terms. A low bid is not a deal if the missing work shows up later.

3. Review Allowance Adequacy

Allowances are the most common budget trap. They make the bid look fixed while leaving the real finish cost open.

Use HomeAdvisor, Fixr, and RSMeans as reference points, then adjust for the market and the finish level required by comparable sales.

4. Audit Math and Extensions

For every quantity line, multiply unit price by quantity. Then sum the lines. Engineering News-Record has documented arithmetic errors as a recurring bid issue. A $47,000 bid with a $3,200 extension mistake is not a $47,000 bid.

Check:

1. Quantity times unit price equals line total.
2. Subtotals add to the grand total.
3. Overhead and profit are applied consistently.
4. Contingency is visible, not hidden.
5. Alternates and exclusions do not contradict the base scope.

5. Verify Contractor Qualification

A budget is only as reliable as the contractor behind it.

• Verify the license through the relevant state board, such as California CSLB.
• Request general liability and workers’ compensation certificates.
• Watch for deposits over 10% to 15%.
• Confirm start date and crew availability.
• Ask for two or three recent references with similar scope.

What Hard Money Lenders Look For

Hard money lenders want budgets that can survive draw inspections. American Heritage Lending explains that rehab funds are released in draws as work is completed. That means the budget needs enough detail to support inspections by trade and milestone.

Your lender wants:

• Itemized scope of work
• Realistic contingency, usually 10% to 15%
• Licensed and insured contractor
• Budget that stays inside the ARV/LTV guardrail
• Draw schedule that matches completed work

Rentastic recommends carrying a renovation contingency, and older or distressed properties usually need the higher end.

When to Get a Pre-Close Budget Review

The best time to review the rehab budget is before closing. If CostCheckGPT or another licensed GC reviewer finds $12,000 in unpriced scope, you can renegotiate, change the offer, or walk away while you still have leverage.

How Detailed Should a Fix-and-Flip Budget Be?

Detailed enough to support draw inspections and actual-vs-budget tracking. A lump sum is not enough for a project over $20,000.

What Contingency Should I Carry?

Use 10% to 20%. Use the high end for older properties, unknown structural conditions, water damage, or pre-1980 construction.

Should I Get Multiple Bids?

Ideally, yes. If you are under a tight due diligence period, a licensed GC review of one bid can still benchmark scope and pricing.

What If the Contractor Will Not Itemize?

That is a serious red flag. If the contractor will not explain what you are buying, the bid is not ready to sign.

Does the 70% Rule Account for Everything?

No. The 70% rule only works if the rehab number is accurate. A bad bid can make good acquisition math look safe when it is not.

Review your fix-and-flip budget with CostCheckGPT