Home Inspection Timeline, Due Diligence Period, and Inspection Addendum Explained

Most buyers focus heavily on getting under contract and then scramble when they realize how compressed the inspection phase actually is. The due diligence period is not a leisurely window to think things over — it is a contractually binding deadline. Miss it, and you may lose your negotiating rights, your earnest money, or both.

Here is how the timeline works from contract execution to inspection resolution, and what a home inspection addendum actually says.

The Typical Inspection Timeline

Day 0: Contract Executed. Your offer is accepted and both parties sign. This is the clock start for your inspection contingency period.

Days 1-2: Book the Inspector. Do not wait. Quality inspectors in active markets book quickly. Contact inspectors the same day or next morning. If you need specialty add-ons — sewer scope, radon test, mold sampling — confirm that the company can conduct them simultaneously on the same day, or arrange separate bookings that still fit within your contingency window.

Days 2-5: Inspection Day. The general inspection takes two to four hours for a standard single-family home, longer for larger or older properties. Plan to attend. If you ordered specialty add-ons, they typically happen on the same visit or within one to two days of the general inspection.

Days 5-7: Receive the Report. Most inspectors deliver their written report within 24 hours of the inspection. Specialty lab results (radon charcoal canisters, mold samples) take two to five business days from the time the sample is collected, not from inspection day. This is why you order them early in the window.

Days 7-12: Review, Get Estimates, Draft Response. This is where most buyers run out of time. After receiving the report, you need to:

1. Sort findings by severity
2. Get written contractor estimates for any significant items — inspectors cannot provide cost estimates themselves
3. Draft your written inspection response (repair request, credit request, or acceptance)
4. Submit your response before the deadline

Day 10-15: Inspection Contingency Deadline. Depending on your contract terms, this is typically 7 to 15 days from contract execution. The deadline requires you to submit a formal written response or the contingency is considered waived and the transaction proceeds as-is.

What the Due Diligence Period Covers

In many states, the "inspection contingency" and the "due diligence period" are effectively the same thing with different names. In other states — particularly Georgia and North Carolina, which have a formal "due diligence period" structure — they have different legal mechanics.

In states with a defined due diligence period (like Georgia and North Carolina), the buyer pays a non-refundable due diligence fee directly to the seller at the time of contract. During the due diligence period, the buyer can back out of the purchase for any reason and receive a full refund of their earnest money deposit (the due diligence fee is non-refundable). After the due diligence period expires, the earnest money becomes non-refundable.

In states using a traditional inspection contingency (most of the country), the buyer does not pay a separate fee. Instead, the contingency clause gives the buyer specific rights: to conduct inspections, to request repairs or credits, and to terminate the contract within the window if findings are unacceptable — receiving a full earnest money refund.

Either way, the effect is the same: there is a hard deadline after which your leverage to exit without financial penalty expires. Buyers who let that window pass while still undecided have lost their most important protection.

What Goes in a Home Inspection Addendum

A home inspection addendum is a formal written document that memorializes the outcome of the inspection negotiation. It is added to (or replaces relevant sections of) the original purchase contract. Depending on your state, it may be called a:

• Inspection Notice
• Buyer's Response to Inspection
• Request for Repair
• Amendment to Purchase Contract

Regardless of the name, the addendum needs to include:

The specific items being requested. Vague language like "seller will fix all inspection items" creates disputes at closing. Reference specific inspection report line items by description, page number, or photo reference. If you are requesting electrical panel replacement, name the panel brand (Federal Pacific, Zinsco) and specify the scope of work.

The remedy requested. You must specify whether you want:

• Seller-performed repair prior to closing (with receipts and permits required)
• A closing credit in a specific dollar amount
• A purchase price reduction in a specific dollar amount

Each has different implications (see below). Be specific. "Seller will address" is not a negotiating outcome.

The deadline for seller response. Your contract will specify how long the seller has to respond — commonly two to five business days. The seller can accept your request, reject it entirely, or make a counter-offer.

Exclusions. If there are items in the inspection report you are explicitly not pursuing — common for cosmetic findings — note that as well. This prevents confusion about what you are releasing versus what you expect addressed.

Credit vs. Repair: Which to Request and When

The most common post-inspection negotiation decision is whether to request a seller-performed repair or a closing credit. The right answer depends on what was found and how complex the repair is.

Request a closing credit when:

• The repair requires licensed tradespeople whose quality you want to control
• You want to select the contractor and materials yourself
• The repair is predictable in scope and cost (e.g., a known electrical panel replacement or a water heater)
• Your loan program allows sufficient seller credits (conventional loans typically cap seller concessions at 2% to 3% of purchase price depending on down payment; FHA and VA loans have different caps)

Request a seller-performed repair when:

• The defect must be resolved to satisfy your lender or insurer before closing (a cracked heat exchanger, for instance, can prevent mortgage funding)
• The repair requires a permit that should be pulled in the seller's name during their ownership
• The item is simple enough that quality variation is not a material concern

Use a purchase price reduction when:

• The issue is non-urgent and you want a lower overall loan balance
• The seller refuses credits but will negotiate on price
• The closing credit would push you over your loan program's concession cap

Note the cash-flow mechanics of a price reduction: a $10,000 price reduction saves you roughly $50 per month on a 30-year mortgage, but you will still need to pay the repair contractor $10,000 out of pocket immediately after closing. A closing credit puts that $10,000 in your pocket at the closing table. For most buyers with limited reserves, a credit is more useful.

When the Seller Says No

If the seller rejects your inspection requests, you are at a decision point. Your options depend on where you are in the contingency timeline:

Still within the contingency window: You can accept the home as-is, negotiate further, or terminate the contract and receive your earnest money back in full. This is your maximum leverage moment — use it.

Outside the contingency window: Terminating the contract without a contingency protection means losing your earnest money deposit (typically 1% to 3% of the purchase price). The leverage is gone.

The most common reason buyers find themselves outside the window with unresolved issues is not bad faith negotiation — it is poor time management during the contingency period. Contractor estimates take time. Lab results take time. Scheduling a structural engineer takes time. Plan for all of these on Day 1 of your contingency window, not Day 8.

The Home Inspection Checklist & Red Flag Guide includes a contingency timeline worksheet and a repair request template you can adapt for your specific state's contract language — designed to help you stay organized from inspection day through final addendum.