Addendum to Purchase Agreement (Universal) — Missouri Edition Template

Deals change after signing — repair credits get negotiated after inspection, closing dates slip, appraisal gaps get bridged, personal property gets added or removed. The clean, enforceable way to document any of it is a written addendum executed by all parties, because nearly every purchase agreement contains an integration/merger clause providing that modifications must be in writing, and the statute of frauds in every state requires material modifications to real estate contracts to be written anyway.

This Universal Addendum to Purchase Agreement is deliberately flexible: it identifies the underlying contract by parties, property, and effective date; provides numbered blank provisions for the new or modified terms; states that all other terms of the purchase agreement remain in full force and effect; handles conflicts between the addendum and the original agreement (addendum controls); and includes execution blocks for all buyers and sellers with dates. It is the form you reach for dozens of times a year.

The 3-page template also ships with a drafting guide containing ready-to-adapt clause language for the most common addendum scenarios: inspection repair resolutions, closing date extensions, appraisal gap provisions, seller concessions and credits (with a note on lender concession caps), personal property inclusions, post-closing occupancy stubs, and contingency waivers. The 50-state notes flag jurisdictions with specific counterpart-execution or electronic signature nuances (all states have adopted UETA or equivalent, and federal E-SIGN, 15 U.S.C. § 7001, validates electronic signatures, but practice details vary). Template for drafting purposes — review significant modifications with a broker or attorney.

About this Missouri Edition: Every one of the 12 templates has been redrafted around Missouri's real estate license law (RSMo Chapter 339) and its brokerage relationship statutes (RSMo §§ 339.710–339.860), which give Missouri a statutory menu of seller's agent, buyer's agent, dual agent (lawful only with written consent of all parties, § 339.750), designated agent (§ 339.820), and transaction broker (§ 339.755, the default when there is no written agency agreement). The forms also reflect RSMo § 339.150 (compensation payable only to and through licensed brokers), § 339.105 (escrow accounts), the Missouri Real Estate Commission's rules at 20 CSR 2250 (definite expiration dates, no automatic renewal, advertising and record retention), the statute of frauds (RSMo § 432.010), and Missouri's Uniform Electronic Transactions Act (RSMo Chapter 432). Because Missouri has no mandatory statutory seller disclosure form, the seller disclosure template is built on Missouri's common-law fraud and latent-defect principles plus the methamphetamine-production disclosure statute (RSMo § 442.606) and the psychologically-impacted-property safe harbor (RSMo § 442.600), with the federal lead-based paint rules and RSMo Chapter 701 lead program addressed separately.