In real estate, the inspection period starts on the effective date of the purchase contract, which is the date the fully executed agreement is delivered to all parties after the last signature. From that date, the clock runs for whatever number of calendar days your contract specifies, typically 7 to 10. The exact trigger and length are written into your agreement, so the answer to when the inspection period starts in real estate is always: read the contract, confirm the effective date, and count from there.
What Triggers the Start
The effective date is not necessarily the day you signed, and it’s not necessarily the day the seller signed. It’s the date a complete, agreed-upon contract has been delivered to everyone involved after the last signature. That distinction matters more than most buyers realize, because signing and delivery can happen on different days.
Some contracts define the trigger differently. The inspection period might begin when the buyer’s earnest money deposit is received by the escrow holder, when the seller delivers required disclosures such as HOA documents or a property condition report, or after another contingency like loan pre-approval has been satisfied. These alternative triggers are less common, but they appear often enough that you cannot assume the clock started when you think it did. Read the paragraph of your contract that defines the inspection period, and read the paragraph that defines “effective date.” Those two together control everything.
When Buyer and Seller Sign on Different Days
A common source of confusion is figuring out the effective date when the parties sign days apart. If you sign on Monday and the seller countersigns on Wednesday, the effective date is generally Wednesday, because that’s when mutual agreement exists. Even then, it isn’t always the end of the story. Some contract forms define the effective date specifically as the date of delivery after the last signature, which can push it a day or two later if the signed contract isn’t immediately sent to all parties.
Your agent should write the effective date on the contract itself once it’s established. If there’s any ambiguity, ask before the clock runs rather than after. A one-day miscalculation on the front end means your inspection response arrives a day late on the back end, and that has real consequences.
How to Count the Days
Most real estate contracts count inspection period deadlines in calendar days, which means weekends and holidays count toward your total. The first full day after the effective date is day one. If your contract has a 10-day inspection period and the effective date is March 3, day one is March 4 and your deadline is March 13.
Some contract forms used in certain markets include a rollover provision: when the final day lands on a weekend or federal holiday, the deadline shifts to the next business day. This is not universal. Many contracts enforce the deadline regardless of what day of the week it falls on. If your deadline lands on a Saturday in July and your contract has no rollover clause, Saturday is the deadline.
Federal holidays that could affect your timeline in 2026 include New Year’s Day (January 1), Martin Luther King Jr. Day (January 19), Washington’s Birthday (February 16), Memorial Day (May 25), Juneteenth (June 19), Independence Day observed (July 3), Labor Day (September 7), Columbus Day (October 12), Veterans Day (November 11), Thanksgiving (November 26), and Christmas (December 25).1U.S. Office of Personnel Management. Federal Holidays Your contract may also recognize state holidays, so check the governing terms.
The Federal 10-Day Lead Paint Window
If the home was built before 1978, federal law gives you a minimum 10-day window to conduct a lead-based paint inspection or risk assessment, regardless of what your contract says about the general inspection period.2U.S. Environmental Protection Agency. Real Estate Disclosures About Potential Lead Hazards The seller must also disclose any known lead paint hazards and provide an EPA pamphlet about lead risks.
You and the seller can mutually agree in writing to shorten or lengthen this 10-day period, and you can waive the lead inspection entirely. The seller cannot refuse to offer it. This federal requirement applies to most private housing, public housing, and federally assisted housing built before 1978.2U.S. Environmental Protection Agency. Real Estate Disclosures About Potential Lead Hazards If your general inspection period is shorter than 10 days and you’re buying an older home, confirm your lead paint rights aren’t being compressed.
Due Diligence Period vs. Inspection Contingency
Not every state handles the inspection window the same way, and the terminology signals a real difference in what you can do with the time. In most states, you’ll work with an inspection contingency, which gives you the right to inspect the property and then negotiate repairs or a price reduction based on what the inspector finds. If the seller refuses to address your concerns, your ability to cancel depends on the specific contract language.
A handful of states use a broader concept called a due diligence period. During due diligence, you can terminate the contract for any reason, not just inspection-related issues. If you discover zoning restrictions, neighborhood problems, or anything else that makes you uncomfortable, you can walk away and keep your earnest money. The due diligence period typically requires an upfront, non-refundable fee paid directly to the seller, separate from your earnest money deposit.
The start date rule is the same for both frameworks: it’s defined in the contract and almost always tied to the effective date. What changes is how much latitude you have during the window, not when the window opens.
What a Missed Deadline Costs
Missing the inspection deadline is one of the most expensive mistakes a buyer can make. When the period expires without a written response from you, the contingency is generally considered waived. That means you’ve accepted the property’s condition as it stands, and you lose the right to negotiate repairs, request credits, or terminate based on inspection findings.
The financial exposure is real. If problems surface after the contingency expires and you try to back out of the deal, you risk losing your earnest money deposit. In contracts that include a “time is of the essence” clause, the consequences are sharper: missing a deadline can constitute a material breach, potentially exposing you to legal action from the seller beyond the deposit.
Even if you don’t want to terminate, a missed deadline destroys your leverage. A seller who knows you’ve lost contingency protection has little incentive to negotiate on anything. Track your deadline from the moment you have an effective date, and submit your written response at least a day early. Contract deadlines are not suggestions.
Requesting an Extension
If you’re running out of time and haven’t finished your inspections or received all your reports, you can ask the seller for an extension. This requires a written addendum to the contract that both parties sign. The seller is not obligated to agree. Whether they will depends on market conditions, how much they want to close with you, and how reasonable your request sounds.
Extensions are easier to get when you have a legitimate reason for the delay, such as a specialist being unavailable or a utility not being turned on as agreed. They’re harder to get when the seller suspects you’re using extra time to shop for a better deal. Your agent should communicate the reason clearly and propose a specific new deadline rather than asking for open-ended additional time.
Until the extension is signed by both parties, your original deadline still applies. Verbal agreement is not enough. If the seller’s signature on the extension addendum arrives after your original deadline has passed, you may have already waived your contingency, and the extension may come too late to matter.
A Practical Checklist for the First 24 Hours
Once your contract is executed, three things need to happen quickly. Confirm in writing what date your agent is treating as the effective date, and make sure it matches the contract definition. Count your deadline on a calendar, noting any weekend or holiday that falls on or near it, and write that deadline somewhere you cannot miss. Book your general inspection within the first two or three days of the period so you have room for specialist follow-ups, estimates, and a written response before the clock expires.
The inspection period is one of the few parts of a real estate transaction where the burden is almost entirely on you, the buyer, to act within a fixed window. The seller doesn’t have to remind you. The lender doesn’t track it. Knowing precisely when it starts is the first and most important step in protecting what the contingency gives you.