Can an addendum be signed electronically?

Yes. Electronic signatures are generally enforceable under the ESIGN Act (15 U.S.C. ch. 96) and state UETA rules when the parties consent, the intent to sign is clear, and the record can be retained.

Do certain addenda require notarization or witnesses?

Most commercial addenda do not require notarization; however, state-specific rules or underlying subject matter (real property transfers) may require notarization or witnesses. Verify local statutory requirements.

What happens if a signer lacks authority?

If an unauthorized individual signs, the addendum can be voidable. Confirm signatory authority in corporate minutes or procurement delegations before execution to reduce enforcement risk.

How do I correct a signed addendum with an error?

Prepare a corrective addendum or mutual amendment that identifies the error and the agreed correction, then obtain signatures from the same authorized parties who executed the original.

Is a platform audit trail sufficient evidence?

An audit trail showing intent, timestamp, IP or MFA evidence, and signer attribution supports admissibility. Preserve the audit record; ESIGN's legal test requires retention and reproducibility.

How do I revoke or cancel an addendum?

Revocation or cancellation requires a written agreement executed by all parties or reliance on contract termination provisions. Check governing law and contract clauses for required notice and timing.

Electronic Signature
Templates
Project Management
Project Management Proposal Addendum

Project Management Proposal Addendum

This template is fully customizable. Edit the text, fill out the fields, and send it for signature. Give it a try!

PROJECT MANAGEMENT PROPOSAL ADDENDUM

Project Identification

Project Title:

Project ID Addendum Number

Effective Date:

Parties

Client Name Client Address Service Provider Name Service Provider Address

Recitals and Purpose

This Addendum modifies the original Project Management Proposal titled "" dated . All terms of the original proposal remain in force except as expressly amended herein.

Scope of Work

The Service Provider shall perform the following additional or revised services under this Addendum:

Items Specifically Out of Scope

Deliverables and Acceptance

List the deliverables added or modified by this Addendum and the objective acceptance criteria for each.

Deliverable 1 - Description Deliverable 1 - Acceptance Criteria

Planned Delivery Date:

Deliverable 2 - Description Deliverable 2 - Acceptance Criteria

Planned Delivery Date:

Timeline and Milestones

Project Start Date: Project End Date:

Milestone 1

Target Date:

Milestone 2

Target Date:

Budget and Payment

The total contract value as modified by this Addendum is: $

Payment Schedule Change Order Process

Changes to scope or price shall be authorized only by a written change order signed by both parties. Requires written and signed change order

Confidentiality

The parties acknowledge that in connection with performance under this Addendum each may receive Confidential Information. Confidential Information includes all non-public business, technical and financial information disclosed by one party to the other whether disclosed orally, in writing or by inspection.

Exceptions or Special Confidentiality Terms

Legal Provisions

Governing Law: This Addendum shall be governed by and construed in accordance with the laws of the state of , exclusive of its conflicts of law rules.

Limitation of Liability: Except for liability arising from gross negligence or willful misconduct, the Service Provider's aggregate liability for claims related to this Addendum shall not exceed the amount paid to the Service Provider under this Addendum.

Termination: Either party may terminate this Addendum upon days' written notice if the other party materially breaches any obligation and fails to cure within the notice period.

Entire Agreement: Except as expressly modified herein, all terms and conditions of the original Proposal and any previously executed agreements between the parties remain in full force and effect.

Signatures

Client Printed Name:

By (Signature):

Date:

Service Provider Printed Name:

By (Signature):

Date:

What the Project Management Proposal Addendum Is

A Project Management Proposal Addendum is a formal written attachment to an existing proposal that documents modifications to scope, schedule, costs, deliverables, or payment terms. It supplements the original proposal or contract, records agreed change orders, and creates a clear, signed record of mutual consent to the revisions.

Why a Clear Addendum Reduces Risk

Using a written addendum clarifies responsibilities, prevents scope creep, and creates enforceable evidence of agreed changes. Electronic execution meets U.S. e-signature law standards under the ESIGN Act (15 U.S.C. ch. 96) and state UETA frameworks when properly executed.

Who Commonly Prepares and Signs Addenda

Several project stakeholders create or approve proposal addenda to reflect changes and control risk during delivery.

Project managers and PMO leads who manage scope and schedule adjustments.
Contractors and subcontractors updating deliverables, rates, or timelines.
Clients or procurement/legal teams approving commercial or compliance changes.

Keep signatory authority and role clarity documented to avoid later disputes.

Core Elements to Include in a Professional Addendum

A complete addendum isolates each change and links it to the original proposal so reviewers can quickly confirm what has been modified and why.

Scope Amendment

Precisely describe tasks added, removed, or modified, referencing original proposal section numbers and exhibits to avoid ambiguity during performance and invoicing.

Deliverables

List deliverables with acceptance criteria and formats, including milestones, delivery media, and any acceptance test or review procedures required for sign-off.

Revised Schedule

Provide new milestone dates, critical path impacts, and dependencies so calendar and resource planning remains aligned with the amended scope.

Payment Terms

State pricing changes, payment triggers, invoicing schedule, retainage (if any), and how disputed amounts will be handled between the parties.

Change Control

Describe the procedure for future changes: who authorizes, required documentation, approval thresholds, and how scope and cost impacts are recorded.

Acceptance & Closeout

Define sign-off steps, deliverable handover responsibilities, and post-acceptance obligations such as warranty periods or maintenance.

Required Information and Data Fields

Parties: Full legal names

Effective Date: MM/DD/YYYY

Change Description: Concise summary

Consideration: Price or credit

Authority: Signer role/title

Attachments: Referenced exhibits

Step-by-Step: Completing the Addendum

Follow a clear sequence to prepare, approve, and finalize the addendum so all parties have an auditable record of consent.

01

Draft the Amendment: Document the change and reference original proposal.
02

Internal Review: Legal and finance confirm terms and pricing.
03

Obtain Signatures: Authorized signers execute in the proper order.
04

Distribute and Archive: Send signed copies to all parties and store securely.

Configuring an Electronic Workflow for Addenda

Set consistent fields, authentication, and routing rules when converting the addendum into a reusable electronic template.

Field	Configuration
Signature Authentication	Email link with optional SMS code
Conditional Fields	Show pricing fields only when scope expanded
Routing Order	Client → Contractor → Legal
Retention Setting	Auto-archive PDF after execution

Where to Send and Store the Executed Addendum

Establish a single distribution path so each stakeholder receives the executed addendum and the organization retains an authoritative copy.

Client Copy: Send final PDF to client contact
Contractor Copy: Provide contractor with fully executed version
Project Archive: Save in project document repository
Legal/Procurement: File with contract management system

Digital Signing and Platform Capabilities

Choose a platform that supports standard file formats, execution audit trails, and appropriate signer authentication for your risk level.

File Formats: PDF, DOCX supported
Integrations: Salesforce, NetSuite, Microsoft 365
Security Certifications: AES-256 at rest, TLS 1.2/1.3

Platforms that provide audit trails, conditional fields, and optional HIPAA Business Associate Agreements simplify compliance and traceability for addenda executed electronically.

Common Deadlines and Timeframes to Track

Track critical dates in the addendum to ensure timely performance, invoicing, and dispute windows.

Effective Date:

Date obligations begin; use MM/DD/YYYY

Acceptance Period:

Time allowed to accept deliverable changes

Payment Due:

Days from invoice or milestone completion

Objection Window:

Period to challenge changes after notice

Record Retention:

Follow retention schedules after closeout

Milestones and Processing Stages

A sequential milestone view helps teams track approvals, signatures, and archive steps for the addendum lifecycle.

01

Draft Issued

Owner circulates proposed addendum for review

02

Review Complete

Comments addressed and final language agreed

03

Signatures Collected

All authorized parties execute the document

04

Archive & Distribute

Signed copy distributed and stored securely

Common Preparation and Execution Mistakes

Using vague language for scope changes that leaves interpretation open to later dispute and claim work.
Failing to confirm the signer has authority, which can render the addendum unenforceable or cause contract repudiation.
Mismatched or missing dates across documents that create uncertainty about when obligations and deadlines begin.
Not attaching or referencing required exhibits and original proposal sections, causing confusion about the exact amendment context.

Risks and Potential Consequences of an Incorrect Addendum

Payment Disputes: Overbilling or unpaid invoices

Delay Claims: Schedule slippage and cost impacts

Breach Liability: Contractual damages exposure

Regulatory Risk: Industry compliance failures

Tax Treatment: Incorrect reporting or withholding

Invalid Amendment: Execution defects void change

eSignature Pricing and Feature Snapshot

Comparison of starting prices and common capabilities across vendors. signNow is listed first to show relative plan entry points and basic compliance attributes.

	signNow	DocuSign	Adobe Sign	PandaDoc	HelloSign
Starting Price	$8/user/mo	$15/user/mo	$14/user/mo	$19/user/mo	$15/user/mo
Free Trial	7-day free trial	Varies by plan	Varies by plan	Varies by plan	Varies by plan
Bulk Send	Yes (Business Premium)	Yes	Yes	Yes	Limited
Audit Trail	Yes	Yes	Yes	Yes	Yes
HIPAA Compliant	Yes (BAA available)	Yes	Yes	No	No
Envelope Cap	No envelope cap	100 envelopes/user/year	Varies by plan	Varies by plan	Varies by plan

Frequently Asked Questions and Troubleshooting

Answers to common questions about execution, validity, signatures, and what to do if errors occur when processing an addendum.

Need help? Contact support

Can an addendum be signed electronically?
Yes. Electronic signatures are generally enforceable under the ESIGN Act (15 U.S.C. ch. 96) and state UETA rules when the parties consent, the intent to sign is clear, and the record can be retained.
Do certain addenda require notarization or witnesses?
Most commercial addenda do not require notarization; however, state-specific rules or underlying subject matter (real property transfers) may require notarization or witnesses. Verify local statutory requirements.
What happens if a signer lacks authority?
If an unauthorized individual signs, the addendum can be voidable. Confirm signatory authority in corporate minutes or procurement delegations before execution to reduce enforcement risk.
How do I correct a signed addendum with an error?
Prepare a corrective addendum or mutual amendment that identifies the error and the agreed correction, then obtain signatures from the same authorized parties who executed the original.
Is a platform audit trail sufficient evidence?
An audit trail showing intent, timestamp, IP or MFA evidence, and signer attribution supports admissibility. Preserve the audit record; ESIGN's legal test requires retention and reproducibility.
How do I revoke or cancel an addendum?
Revocation or cancellation requires a written agreement executed by all parties or reliance on contract termination provisions. Check governing law and contract clauses for required notice and timing.

be ready to get more

Join over 28 million airSlate SignNow users

Sign Now