What to Check Before Buying a House: The Pre-Offer Due-Diligence Checklist

Ask what to check before buying a house and most checklists answer with the steps after your offer is accepted: inspection, title, appraisal. That is the expensive end, when you have already negotiated a price and put earnest money at risk. The checks that decide whether to offer at all, and at what price, take about an hour from public sources; this guide is that hour.

Two checklists: before the offer and after acceptance

The post-acceptance phase is governed by your state's contract form: contingency periods for inspection, financing and appraisal, or in North Carolina a "due diligence period" with a non-refundable "due diligence fee" paid to the seller. It protects you against surprises inside the house, not against overpaying for the right house on the wrong street; that is what the pre-offer hour is for.

Value check: comps, price per square foot, days on market, price history

Start with the question that decides everything else: do recent sales of similar homes support the asking price?

Comparable sales. The standard a lender's appraiser will later apply is written into Fannie Mae's Selling Guide: comparable sales should generally have closed within the last 12 months, be similar in location, size, age, condition and features, and at least three closed sales have to appear in the report, each adjusted for how it differs from the subject¹. Apply the same test with three to five closed sales (not listings) from the same subdivision or within a few blocks, of roughly the same size and age. If the asking price sits above every adjusted comparable, the appraisal will probably say so too, and you will be asked to cover the gap in cash. The comparable sales guide explains where to find closed prices and how to adjust them.

Price per square foot. Divide each comparable's price by its living area and compare with the listing, but only between homes within about 20 percent of each other's size: smaller homes sell for more per square foot than larger ones in the same neighborhood.

Days on market and price history. The national median listing sat 60 days on the market in August 2026, at a median listing price of $424,500². A listing far beyond your local median with one or two price cuts is negotiating room. Check the price history and the county's record of the last sale: a house bought 18 months ago and relisted much higher without visible work deserves a question. Turning these observations into an offer number is the subject of the asking price check.

Location risks: flood zone, crime statistics, noise, air, wildfire

The house can be fixed; the address cannot.

Flood zone

Look the address up on FEMA's flood maps. Zones beginning with A or V are Special Flood Hazard Areas, the National Flood Insurance Program's high-risk zones, where FEMA puts the chance of at least one flood over a 30-year mortgage at 1 in 4³. If the house is in one and you finance it with a federally backed or regulated mortgage, flood insurance is not optional: federal law directs the lender to require it⁴. Get a quote before you offer; the premium can change the price you can afford. Zones B, C and X are moderate to low risk, not no risk: nearly one-third of NFIP claims from 2014 to 2024 came from outside the high-risk areas³.

Do not rely on the seller, because disclosure duties vary by state. In California, sellers must deliver a Natural Hazard Disclosure Statement saying whether the property is in a Special Flood Hazard Area (Zone A or V), a dam inundation area, a very high fire hazard severity zone or wildland fire area, an earthquake fault zone or a seismic hazard zone⁵. The flood zone by address guide covers the maps, the insurance and what a zone does to resale value.

Crime statistics

Crime data is the most misread item on any checklist, so start with what it measures. The Bureau of Justice Statistics' national victimization survey counted 23.3 violent victimizations per 1,000 persons age 12 or older in 2024, and only about half were reported to police⁶; police-reported figures undercount, and a gap between two areas can be a gap in reporting as much as in crime. Then find the local source: city open data (Los Angeles publishes its police department's crime dataset), county and state statistics, the FBI's national aggregates. Compare the area with the city and county average, follow the trend over several years, and separate property from violent crime. Statistics describe places, not the people who live there. The crime rate by address guide explains where each dataset comes from and what "by address" can and cannot mean.

Noise

Buyers notice noise after moving in, because showings happen at quiet hours. Use the federal transportation noise map for modeled road, rail and aviation noise at the address, then visit at rush hour and on a weekday evening. HUD's benchmark for housing it funds: a day-night average sound level above 65 decibels is "normally unacceptable" and above 75 decibels unacceptable⁷. Energy class and the other neighborhood factors that move price are in the noise, energy and neighborhood guide.

Wildfire and air

For wildfire, check the state hazard map where one exists (California puts fire hazard zones on the same disclosure statement as flood⁵) and ask an insurer whether the address is insurable at all; for air quality, the EPA's county monitoring data is enough for a first pass.

Running costs: property tax, insurance quotes, HOA, energy

A house you can afford to buy but not to run is the classic first-time-buyer mistake, and the numbers are public.

Property tax. Effective rates, the annual tax as a share of home value, differ several times over between counties: about 0.3 percent in Honolulu County, Hawaii, against about 1.9 percent in Atlantic County, New Jersey, in the Tax Foundation's 2026 county table built on 2024 Census survey data⁸. On a $424,500 home that is the difference between roughly $1,300 and $7,900 a year. Look up the county's rate and check how your state handles a sale: in some states the assessed value resets to your purchase price, so the seller's bill understates yours.

Insurance. The Treasury's Federal Insurance Office found that average homeowners premiums rose 8.7 percent faster than inflation from 2018 to 2022 and that consumers in the 20 percent of ZIP codes with the highest expected climate-related losses paid $2,321 a year on average⁹. Get a real quote for the address before you offer, plus a flood quote where the map suggests one³.

HOA and special assessments. Ask now for the dues, the reserve study and any pending or recent special assessments.

Energy and systems. Ask for twelve months of utility bills and note the age of the roof, HVAC and windows. The full running-cost budget, with maintenance reserves, is built in the cost of owning a home guide.

The record: owner of record, deed, disclosures, permits, zoning

The public record is the cheapest check on the list and the one most buyers skip.

Owner of record and deed. The county assessor and recorder show who holds title, when the property last sold and for how much, and by what kind of deed. The seller named in the listing should be the owner of record. If title is held by a trust, an LLC or an estate, the sale is still normal, but the person signing needs authority and the timeline can be longer; the LLC and trust ownership guide explains those records, and the property owner lookup guide shows how to search county records by address.

Disclosures. Ask for the seller's disclosure forms before you offer, even if your state only requires delivery later; in California that means the Natural Hazard Disclosure Statement⁵ and the Transfer Disclosure Statement.

Permits and zoning. The building department's permit history shows whether the finished basement, the garage conversion or the added bathroom was permitted; unpermitted work affects value, insurance and resale. The zoning code tells you whether an accessory dwelling unit, a home business or a short-term rental would be allowed.

Ownership data from public records is for your own decision about the property; the Fair Credit Reporting Act notice on any US owner-of-record data means it may not be used for credit, employment, insurance or tenant-screening decisions. This is general information, not legal or tax advice.

Sixty minutes on an $899,000 San Fernando Valley listing, check by check

Suppose you are looking at a 1,450-square-foot, three-bedroom, two-bath house in the San Fernando Valley in Los Angeles, listed at $899,000 after one price cut from $925,000, 68 days on the market. All figures are hypothetical.

What the hour produced: the comparables support about $840,000 to $885,000, not $899,000; the tempo (68 days, above the national median of 60², and a price cut) says the seller knows it; the running costs are roughly $12,500 a year before utilities and maintenance; and the unpermitted garage conversion is a negotiating point and an inspection item. A defensible offer in this example is around $860,000, plus a request for permit documentation and the disclosure statements. Without the hour, the natural offer would have been "a little under asking", about $30,000 higher.

Value, address risks, ownership costs and the seller's name in one report

For the pre-offer hour, a CheckValue report for the listing address compresses the desk work into one document. The parts a buyer uses most:

• Value against asking. A point value with its range, the price per square foot and the closed comparable sales behind them, each with distance and date, so you can hold the seller's price up against evidence a lender's appraiser would recognize. Next to it sits the market tempo, the context for the listing's own days on market.
• The address risks in one place. Flood, energy and noise maps for the exact address, and a crime score from 1 to 10 drawn from official police statistics at county level (10 marks the safest tenth of counties, 1 the tenth with the most offenses per 100,000 inhabitants). It scores the place, not the people.
• The cost of owning it. Ownership costs alongside a rent estimate and gross yield.
• Who is selling. For a US address, the owner of record from county records, so you can see whether the name on the listing matches the name on the roll; the data may not be used for credit, employment, insurance or tenant-screening decisions.

Enter the listing address, confirm the facts from the listing, and the free preview of the report for the listing address appears on screen before anything is paid. What it cannot do is look inside the house: it is neither an inspection nor a licensed appraisal, and your lender will still order its own. The sample reports for Los Angeles, Vienna, Berlin, Paris, Madrid and Rome show a finished one.

Red flags that should change your offer, or stop it

Lower the offer:

• Adjusted comparables cluster below the asking price¹; the appraisal will likely agree.
• Days on market well above the local tempo, with price cuts².
• Property tax or insurance materially above what the listing's "estimated monthly payment" assumed⁸⁹.
• Unpermitted additions or conversions.
• Modeled noise above 65 dB DNL⁷, or a site visit that contradicts the quiet showing.

Stop, or at least pause:

• A Special Flood Hazard Area with no insurance quote in hand³⁴; the premium can rival a mortgage payment.
• No insurer willing to write the address at a normal premium.
• A seller who is not the owner of record and cannot show authority to sell.

What to check before buying a house: the printable checklist

Check these off for every listing you are serious about.

1. Three to five adjusted closed comps within 12 months¹; is the asking price inside the range?
2. Price per square foot against comparables of similar size.
3. Days on market against the local median (60 nationally, August 2026²); full price history.
4. Last sale date and price from the county record.
5. Flood zone on the FEMA map³; flood quote if in a hazard area or in doubt⁴.
6. Crime statistics for the area against the city and county, five-year trend⁶.
7. Noise map level⁷ and two site visits at different hours.
8. Wildfire and other hazard zones; insurer confirms the address is insurable.
9. Effective property tax rate and what happens to the assessment on sale⁸.
10. Homeowners insurance quote for this address⁹.
11. HOA dues, reserves, special assessments.
12. Twelve months of utility bills; age of roof, HVAC, windows.
13. Owner of record matches the seller; type of ownership.
14. Seller's disclosure forms (in California the Natural Hazard Disclosure Statement⁵ and the Transfer Disclosure Statement).
15. Permit history and zoning for anything you plan to change.

Roughly half of these items are in a single CheckValue report; the site visits, quotes, disclosures and permit search take the rest of the hour. Do the hour every time: it is the only stage of buying where the information is nearly free and the position is entirely yours.

This article is general information, not legal, tax or investment advice. Figures and rules carry the year they were published; check the cited source for the current version.

Christian Eckmair

Co-founder, CheckValue · More than 20 years in real estate in Tenerife and Austria · Reviewed by Josef Eckmair MBA

Christian Eckmair is co-founder of CheckValue and of CBDNOL GmbH (Ansfelden, Austria). He has worked in real estate for more than 20 years in Tenerife and Austria – buying, renovating, letting and selling residential property – and writes about home values, buying checks and ownership records.

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