How Cash Home Buyers Calculate Their Offer in California

A cash offer can feel like a number pulled out of the air, especially when it’s well below what a neighbor’s house listed for. It isn’t.

Most cash buyers work backward from what the house will be worth after repairs, then subtract what it will cost them to get there and a margin for their risk.

Once you know the pieces, you can tell whether an offer is reasonable, ask better questions, and sometimes raise the number.

The Basic Formula

Almost every cash offer comes down to this:

Offer = After-repair value − repairs − holding and financing costs − buying and selling costs − profit margin

Each piece is an estimate, and two buyers can land on different numbers for the same house. Here’s what goes into each one.

1. After-Repair Value (ARV)

ARV is what the house should sell for once it’s fixed up. Buyers estimate it from recent sales of similar, updated homes nearby, ideally within the last few months and close by, then adjust for square footage, bedrooms, bathrooms, lot size and condition.

This is the single biggest number in the formula, so small differences matter. An ARV that’s $40,000 too low takes $40,000 off your offer. To distinguish that renovated value from the home as it stands, see what affects your home’s current market value.

It’s fair to ask a buyer which sales they used. If they picked fixer sales instead of renovated ones, or homes from a weaker street, the ARV is probably too low.

2. Repair Estimate

This covers everything needed to make the house sell at the ARV: roof, foundation, plumbing, electrical, HVAC, kitchen, baths, flooring, paint, landscaping and permits. Experienced buyers also add a cushion for surprises, because opening walls in an older California house rarely finds good news. A credible estimate is itemized. A flat, round deduction with no breakdown is a sign nobody really looked.

3. Holding and Financing Costs

From the day the buyer closes until the day they resell, they pay property tax, insurance, utilities and any HOA dues. In California, property tax is reassessed at the purchase price, with a base rate of 1% plus local assessments.

Many buyers also use short-term loans or investor capital, so interest and loan fees add up every month. A renovation that runs four to six months from purchase to resale is common, and longer if permits are involved.

4. Buying and Selling Costs, Including Transfer Taxes

The buyer pays closing costs twice: once when buying from you, and again when reselling. Resale costs usually include agent commissions, escrow, title insurance and transfer taxes. California counties charge a documentary transfer tax of $1.10 per $1,000 of value, and some cities add their own.

The City of Los Angeles, for example, adds its own transfer tax, plus an extra tax on high-value sales under Measure ULA. Culver City is another example, where Measure RE’s rate tiers add real cost at closing.

On a property in a city with a high transfer tax, this line can be larger than people expect.

5. Profit Margin

Buyers need a margin to make the risk worth it. If repairs run over, the market softens or the house takes longer to sell, the margin is what absorbs it. Margins vary by buyer, market and how risky the project looks. A cosmetic update in a hot neighborhood needs less cushion than a foundation job in a slow one.

The “70% Rule”: Rule of Thumb vs. Reality

You’ll often hear that cash buyers offer 70% of ARV minus repairs. It’s a quick screening tool, not a law, and real offers move around it:

• Higher-priced homes can support a higher percentage, because costs like escrow and insurance don’t grow in step with price.
• Lower-priced homes or heavy rehabs often come in under 70%, because fixed costs and risk eat a bigger share.
• Buyers who plan to keep the house as a rental may price it on rent and long-term value instead of a quick resale.

The example below shows how far apart the shortcut and a line-by-line calculation can be.

A Fully Worked Example

A three-bedroom house in Los Angeles County needs a new roof, updated electrical, a kitchen and bathrooms, and cosmetic work. Renovated homes nearby have sold around $800,000. All numbers below are illustrative assumptions.

Here the detailed math supports an offer almost $60,000 higher than the 70% shortcut. Flip a few assumptions, like a longer permit timeline, a lower ARV or a bigger repair list, and the number drops fast. That’s why the inputs matter more than the formula.

It also shows why a cash offer is usually below the ARV. Roughly a third of the value in this example goes to repairs, carrying costs, two sets of closing costs and margin. If the house were already in good condition, most of those costs would disappear, and listing it would likely net you more.

How Sellers Can Raise Their Number

• Get more than one offer. Different buyers have different costs and margins. Comparing two or three written offers is the simplest way to find the best one.
• Challenge the comps. If you know of a better-matched renovated sale nearby, share it. A higher ARV moves the offer more than anything else.
• Share what you know up front. Roof age, permit history, recent repairs and known problems reduce the buyer’s uncertainty and the cushion they build in. Disclosing early also prevents a price cut after inspection.
• Clean up title issues early. Liens, missing heirs or probate questions slow closing and add risk. The sooner they’re handled, the less a buyer discounts for them.
• Be flexible on timing. A closing date or move-out date that suits the buyer has value, and you can ask for it back in price.
• Negotiate costs, not just price. Ask who pays escrow, title and transfer tax. A buyer covering those can be worth more than a slightly higher price.
• Skip big repairs, but consider small ones. Spending heavily on repairs rarely pays off before a cash sale, since the buyer plans to redo things anyway. Clearing out debris or fixing an obvious leak can help the house show better.

Questions to Ask Any Cash Buyer

• What ARV did you use, and which sales support it?
• Can I see the itemized repair estimate?
• Who pays escrow, title and transfer taxes?
• Can you show proof of funds?
• Under what conditions would the price change after we sign?

For the full process after you accept an offer, see how cash home sales actually work.

Common Questions

Why is my cash offer lower than my Zestimate?
Online estimates usually assume a home in typical, market-ready condition. A cash offer starts from the after-repair value and subtracts the cost of getting there, so a house that needs work will come in lower.

Is the 70% rule what every buyer uses?
No. It’s a shortcut for screening deals. Serious buyers run the line-by-line math, which can land above or below 70% depending on the house.

Can a cash offer go down after I accept?
It can if the contract allows the buyer to renegotiate after an inspection. Ask before signing what would cause a price change, and get an itemized reason if it happens.

See the Numbers Behind Your Offer

We’ll show you the comps and repair estimate behind any number we give you. Call (424) 435-2326 or request a no-obligation offer online. We either buy directly or bring a vetted cash buyer, and you can read more about how our process works.

Want to see what other California sellers say about working with us? Find Cash Home Buyers CA on Google for reviews, or call us at (424) 435-2326.