First-Time Home Buyer Mistakes That Cost Thousands

Nine of the ten costliest first-time buyer mistakes happen before an offer is ever written.

By Ken Byrne, NMLS #187129 · ALCOVA Mortgage LLC, NMLS #40508 · Updated September 2026

There is no shortage of lists of home buying mistakes. Most of them are written to be agreed with rather than used, which is why they tend to say things like do not overspend. This one is built the other way round: each mistake gets the mechanism that makes it cost money, the rule or statute behind it where one exists, and the specific thing to do instead. It is written for the Virginia, Maryland and DC market, because several of these are local. If you want a second opinion on where you actually stand before you start, the Ken Byrne Team at JB Financing will look at it with you at no cost.

The mistakes that actually cost money

Ranked the way they show up in a file, not the way they show up in a headline. The cost column is deliberately qualitative: what it costs you depends on your price point, and a made-up dollar range would be worse than useless.

Mistake 1: carrying a prequalification you believe is a pre-approval

A prequalification is a conversation. Someone asked what you earn and what you owe, ran the numbers as you gave them, and produced a letter. A pre-approval is an underwriting event: income documents, assets, credit, and a decision recorded against them. Both produce a PDF and the PDFs look similar, which is the entire problem.

In a market where a seller sees several offers, the listing agent is not reading your letter for the number. They are reading it for whether anyone verified anything. A prequalification against a verified pre-approval loses, and it loses without anyone telling you why. The difference in detail is worth ten minutes before you start touring.

Mistake 2: taking one Loan Estimate and calling it shopping

Rate gets all the attention and it is only half the comparison. The other half is section A of the Loan Estimate, the origination charges, which vary between lenders far more than rates do and which no advertisement ever mentions. Two lenders quoting the identical rate on the identical loan can be several thousand dollars apart on page two.

The Loan Estimate exists precisely to make this comparison possible. It is a standardized form with the same lines in the same order from every lender, and it separates the services you may shop for from the ones you may not. Reading one properly is a skill you learn once and use for the rest of your life.

Mistake 3: borrowing the entire amount you were approved for

An approval is a ceiling, calculated from ratios. It is not a recommendation and it knows nothing about your life. It does not know about the car you will replace, the parental leave you are planning, or that your commute is about to change. Buying at the ceiling means every one of those becomes a financial event rather than an inconvenience.

The specific trap in this market is that the ratios are calculated on today’s figures while three of the inputs are escalators. Property assessments rise. Insurance premiums rise. HOA and condo dues rise, and unlike the other two they can rise by a vote. A payment that is 43 percent of income at closing is not 43 percent of income in year four unless your income moved in step.

The approval is a ceiling produced by ratios. The number you should borrow is a separate decision, and it is yours.

The fix is to decide your own number before you see the approval letter, from your actual monthly budget rather than from a ratio, and treat the approval as a boundary you happen to be inside. Our first-time buyer guide for Virginia, DC and Maryland walks through that calculation in the order that makes it hard to fool yourself.

Mistake 4: budgeting the down payment and forgetting the cash to close

Closing costs sit on top of the down payment. They are not deducted from it and they are not folded into the loan on a purchase. This is the most common arithmetic failure we see, and it surfaces at the worst possible moment: when the Closing Disclosure arrives three business days before settlement and the number is larger than the one in your head.

In Virginia the buyer also pays recordation tax twice on a financed purchase, once on the deed and once on the deed of trust, which national calculators routinely miss and which understates the bill by roughly half. The Virginia closing cost breakdown has the statutory rates and the arithmetic at real price points.

Mistake 5: writing a concession the loan program will not allow

Asking the seller to pay some of your closing costs is standard and often sensible. What catches people is that the ceiling is set by the loan investor, not by the negotiation, and an amount above it does not simply get trimmed. It is re-characterised as a reduction in the sale price, which changes the loan to value and can change the appraisal math underneath the deal.

Fannie Mae Selling Guide B3-4.1-02, Interested Party Contributions. Percentages are of the lower of the sales price or the appraised value. FHA and VA set their own limits and VA draws a distinction between seller-paid closing costs and what it calls concessions, so confirm the ceiling for your specific program before the concession goes into the offer rather than after.

Mistake 6: waiving a contingency you have not priced

Waiving is a legitimate competitive tool and it is not automatically reckless. It becomes reckless when it is done to win rather than because the risk has been quantified. Every contingency has a price, and the price is the thing you are agreeing to absorb if the contingency would have saved you.

A middle path exists and it is underused: keep the inspection for information only, with no right to request repairs. You still learn what you are buying, the seller still gets a clean timeline, and you retain the ability to walk away from something structural rather than discovering it as an owner.

Mistake 7: assuming the appraisal will meet the contract price

The appraisal is not a formality and it is not negotiated. If the appraised value comes in below the contract price, the lender lends against the lower figure. The gap does not disappear and it does not become the seller’s problem automatically. It becomes a negotiation, and if you have waived the appraisal contingency it becomes cash out of your pocket.

This is the single mechanism that makes a waived appraisal contingency expensive in a competitive market, and it is why the waiver deserves a number rather than a shrug. Decide in advance how large a gap you could actually cover, and cap the waiver at that figure rather than waiving it outright. Most listing agents will take a capped waiver seriously.

Mistake 8: opening credit, moving money or changing jobs mid-loan

Underwriting is not a single event. Lenders commonly re-verify employment and re-pull credit shortly before closing, which means the file that was approved in week two has to still be true in week six. Anything that changes your debt-to-income ratio, your credit profile or your documented income can delay the closing or end it.

Mistake 9: misreading how mortgage insurance actually ends

Buyers are frequently told that mortgage insurance goes away, without being told that this is only reliably true on one of the two main loan types. On a conventional loan the exit is statutory. On an FHA loan it is not.

For conventional borrower-paid private mortgage insurance, federal law defines two dates. The cancellation date is when the principal balance is first scheduled to reach 80 percent of the original value of the property, at which point you may request cancellation. The termination date is when it is first scheduled to reach 78 percent, at which point the servicer must end it automatically, provided the loan is current.

12 U.S.C. section 4901 defines both dates; 12 U.S.C. section 4902 sets out the borrower request and automatic termination mechanisms and the conditions attached to each.

FHA annual mortgage insurance has no equivalent statutory cancellation. Whether and when it ends depends on your down payment and the FHA rules in force when your case number was assigned. That is not an argument against FHA, which is the right loan for a great many buyers. It is an argument for asking your lender to state, in writing, when the mortgage insurance on your specific loan ends, before you choose between programs. Where your credit score puts you across loan types is usually the deciding input.

Mistake 10: skipping the DMV specifics

Several of the expensive surprises in this market are jurisdictional, and they do not appear in a national article at all.

The 2026 conforming and FHA high-cost ceiling for one-unit properties is $1,249,125, with the FHA national floor at $541,287, announced by HUD on December 11, 2025 and effective for case numbers assigned on or after January 1, 2026.

The order that avoids most of this

Almost every mistake above is a sequencing failure rather than a judgment failure. Done in this order, most of them cannot happen.

If you have already started and you are somewhere in the middle of this list, that is normal and it is not too late to correct the order. What happens after you are pre-approved picks the sequence up from step three.

Everything we lend on in this state, with the county detail, sits on our Virginia lending page.

Frequently asked questions

What is the biggest mistake first-time home buyers make?

Treating the approval amount as the budget. Everything downstream follows from it: the reserves that never get set aside, the payment that leaves no room when the assessment rises, the repair that goes on a card. It is also the easiest one to avoid, because it costs nothing to decide your own number before you see the letter.

How many lenders should a first-time buyer talk to?

Two or three, with the Loan Estimates issued within about two weeks of each other so the quotes are comparable. Compare page two, not just the rate. Mortgage inquiries inside a normal shopping window are treated as one event by the scoring models, so the concern about damaging your score by shopping is misplaced.

Is a prequalification good enough to make an offer?

It is better than nothing and it is weaker than a pre-approval in any situation where offers are compared. A prequalification reflects what you told someone. A pre-approval reflects what was verified. Listing agents read for the second, and in a multiple-offer situation the difference is often decisive.

How much should I keep in reserves after closing?

Enough that an unexpected repair is an annoyance rather than a crisis. The exact figure depends on the house, its age and your income stability, but the principle is firm: the down payment should not consume every liquid dollar you have. If maximising the down payment would leave nothing behind it, a smaller down payment with reserves intact is usually the better position.

Can the seller pay all of my closing costs?

Up to your program’s cap. On a conventional loan for a principal residence Fannie Mae allows interested party contributions of 3 percent of the lower of price or appraised value above 90 percent loan to value, 6 percent from 75.01 to 90 percent, and 9 percent at or below 75 percent. FHA and VA set their own. Amounts above the cap come off the price instead, which changes the loan to value.

What happens if the appraisal comes in below the contract price?

The lender lends against the appraised value, not the contract price. The gap then has to be resolved: the seller reduces the price, you bring the difference in cash, you split it, or the contract terminates under the appraisal contingency. If you waived that contingency, the last option is not available to you.

Will opening a credit card before closing really stop my loan?

It can. Lenders commonly re-pull credit shortly before settlement. A new account changes your inquiry count, your average account age and, if you use it, your debt-to-income ratio. Whether it is fatal depends on how much margin your file had. The safe rule is to change nothing and tell your loan officer before you do anything you are unsure about.

When does private mortgage insurance come off a conventional loan?

You may request cancellation when the principal balance is first scheduled to reach 80 percent of the original value of the property, and the servicer must terminate it automatically at 78 percent, provided you are current. Those two dates are defined in federal law at 12 U.S.C. section 4901, so this is a right rather than a favor.

Does FHA mortgage insurance ever come off?

It depends on the down payment and on the FHA rules in force when the case number was assigned, and there is no statutory cancellation date equivalent to the conventional one. Ask your lender to put in writing when the annual premium on your specific loan ends before you choose between FHA and conventional. For many buyers FHA is still the right loan; the point is to choose it knowing this.

Should I waive the inspection to win the house?

Consider an information-only inspection before you consider waiving outright. You keep the right to walk away from something structural, you give up only the right to ask for repairs, and the seller still gets the clean timeline they wanted. It is competitive without being blind.

How much are closing costs for a first-time buyer in Virginia?

Budget 2 to 5 percent of the purchase price, with about 3 percent typical across Northern Virginia. The Virginia-specific piece is recordation tax, which the buyer pays on both the deed and the deed of trust, so a national estimator that charges it once understates the bill by roughly half.

Do I need 20 percent down as a first-time buyer?

No. Conventional loans go to 3 percent down for qualified first-time buyers, FHA to 3.5 percent, and VA and USDA to zero for those eligible. Twenty percent avoids mortgage insurance, which is a real saving, but it is not a requirement and waiting years to reach it has its own cost.

Is it a mistake to buy before rates come down?

It is a mistake to assume either direction. Nobody reliably forecasts rates, and the buyers who waited for a number in recent years generally paid more for the house instead. The defensible way to decide is on your own timeline and your own budget at today’s figures, on the basis that a rate can be refinanced later and a purchase price cannot.