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Professional Services Addendum

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PROFESSIONAL SERVICES ADDENDUM

This Professional Services Addendum (this Addendum) is entered into as of by and between Service Provider Name: and Client Name: . This Addendum supplements and amends the Master Services Agreement or other agreement between the parties identified above (the Agreement) and sets forth additional terms and conditions applicable to the Professional Services described herein.

RECITALS

WHEREAS, Service Provider possesses the expertise, personnel, tools and licenses necessary to perform certain professional services; and

WHEREAS, Client desires to engage Service Provider to perform such services on the terms set forth in this Addendum and, where inconsistent, to prevail over any contrary terms of the Agreement; and

WHEREAS, the parties intend that the services, deliverables, payment terms and allocation of risk related to such services be set forth expressly in this Addendum.

NOW, THEREFORE

In consideration of the mutual covenants and agreements contained herein and other good and valuable consideration, the receipt and sufficiency of which are acknowledged, the parties agree as follows:

1. SCOPE OF SERVICES

1.1 Services. Service Provider shall perform the services described in the statement of work below (the Services). The Services shall include, without limitation, the tasks, deliverables and timelines set forth in the statement of work.

2. TERM AND TERMINATION

2.1 Term. The term of this Addendum shall commence on the Effective Date specified above and continue until completion of the Services or earlier termination in accordance with this Section.

2.2 Termination for Convenience. Either party may terminate this Addendum for convenience upon providing days' prior written notice to the other party.

2.3 Termination for Cause. Either party may terminate immediately upon written notice if the other party materially breaches this Addendum and fails to cure such breach within thirty (30) days after receipt of written notice specifying the breach.

3. COMPENSATION AND PAYMENT

3.1 Fees. Client shall pay Service Provider the fees set forth below in consideration for the Services. Fees shall be invoiced in accordance with the billing schedule and are due within the time set forth below.

4. CHANGE ORDERS

Any change to the Services, schedule or fees shall be made only by mutual written amendment or a change order signed by authorized representatives of both parties. Change orders shall specify the change, the effect on fees and schedule, and any other terms affected by the change.

5. CONFIDENTIALITY

Each party acknowledges that in connection with the performance of the Services it may receive Confidential Information of the other party. "Confidential Information" means non-public information that is designated as confidential or that, by its nature, should be treated as confidential. Each party shall: (a) use Confidential Information solely for the purposes of performing under this Addendum; (b) restrict disclosure to employees, contractors or agents who have a need to know and are bound by confidentiality obligations no less protective than those herein; and (c) protect such Confidential Information with at least the same degree of care it uses to protect its own confidential information, but in no event less than reasonable care. Confidential Information does not include information that is or becomes publicly available through no breach by the receiving party, was lawfully in the receiving party's possession prior to disclosure, or is rightfully obtained from a third party without restriction.

6. INTELLECTUAL PROPERTY

6.1 Work Product. Subject to Client's payment in full of all fees owed, Service Provider hereby assigns to Client all right, title and interest in and to any deliverables specifically and exclusively created by Service Provider for Client under this Addendum (the Work Product), and all Intellectual Property rights therein, to the extent transferable. The foregoing assignment does not include Service Provider's pre-existing tools, methodologies, know-how, templates, software, or other materials ("Residual Materials"), for which Service Provider retains ownership. Service Provider grants Client a perpetual, non-exclusive, royalty-free license to any Residual Materials to the extent incorporated into the Work Product solely for Client's internal use.

7. INDEMNIFICATION

Each party (Indemnitor) shall indemnify, defend and hold harmless the other party (Indemnitee) from and against any third-party claims, liabilities, damages and costs (including reasonable attorneys' fees) arising out of the Indemnitor's gross negligence, willful misconduct, or breach of its representations, warranties or obligations under this Addendum. Service Provider further agrees to defend and indemnify Client from any claim that the Work Product, when used in accordance with this Addendum, infringes a third party's issued patent, copyright or trade secret, provided Client promptly notifies Service Provider of the claim and reasonably cooperates in the defense.

8. INSURANCE

Service Provider shall maintain insurance coverage as specified above and shall provide certificates of insurance upon Client's reasonable request. Such insurance shall be primary and non-contributory with respect to any insurance maintained by Client.

9. WARRANTIES; DISCLAIMER

Service Provider warrants that the Services will be performed in a professional and workmanlike manner consistent with industry standards. Except as expressly set forth herein, Service Provider disclaims all other warranties, express or implied, including any implied warranties of merchantability, fitness for a particular purpose, and non-infringement.

10. LIMITATION OF LIABILITY

Except for liability arising from breaches of confidentiality, willful misconduct, or indemnification obligations for third-party intellectual property claims, each party's aggregate liability under this Addendum shall not exceed the total fees paid or payable by Client to Service Provider under this Addendum during the twelve (12) month period preceding the event giving rise to the claim. In no event shall either party be liable for consequential, incidental, special, punitive or exemplary damages.

11. NOTICES

All notices, requests, consents, claims, demands, waivers and other communications hereunder must be in writing and addressed to the parties at the addresses set forth below (or to such other address that a party may designate by written notice). Notices are effective upon receipt when delivered personally, by nationally recognized overnight courier, or by certified mail (return receipt requested).

12. AMENDMENT; WAIVER; COUNTERPARTS

12.1 Amendment. This Addendum may be amended or modified only by a written instrument signed by authorized representatives of both parties.

12.2 Waiver. No failure or delay by either party in exercising any right under this Addendum shall operate as a waiver of that right.

12.3 Counterparts. This Addendum may be executed in counterparts, each of which shall be deemed an original, and all of which together shall constitute one instrument. Signatures transmitted by electronic means shall be binding.

13. GOVERNING LAW; SEVERABILITY; ENTIRE AGREEMENT

13.1 Governing Law. This Addendum shall be governed by and construed in accordance with the laws of without regard to its conflict of law rules.

13.2 Severability. If any provision of this Addendum is held invalid or unenforceable, the remaining provisions shall remain in full force and effect and the invalid or unenforceable provision shall be replaced by a valid provision that most closely approximates the intent and economic effect of the invalid provision.

13.3 Entire Agreement. This Addendum, together with the Agreement, constitutes the entire agreement between the parties with respect to the subject matter hereof and supersedes all prior and contemporaneous agreements, representations and understandings, whether written or oral, relating thereto.

14. MISCELLANEOUS

14.1 Independent Contractor. Service Provider is an independent contractor and nothing in this Addendum creates an employment, partnership, joint venture or agency relationship between the parties.

14.2 Subcontracting. Service Provider may engage subcontractors to perform portions of the Services, provided Service Provider remains responsible for the performance of its subcontractors and compliance with this Addendum.

Service Provider - Printed Name:

By:

Date:

Client - Printed Name:

By:

Date:

Enter text✕

What a Professional Services Addendum Is and When It Applies

A Professional Services Addendum is a contractual amendment that modifies an existing services agreement to add, change, or clarify the scope, fees, deliverables, schedule, or terms for professional services. It sits alongside a master services agreement or contract and becomes binding when executed by the authorized parties. Typical uses include scope expansions, renewed pricing, new milestones, or additional compliance obligations. In U.S. practice an addendum may be signed electronically under federal ESIGN (15 U.S.C. ch. 96) and state UETA statutes where adopted, subject to any statutory exceptions for particular document types or regulated records.

Why Use a Professional Services Addendum Instead of a New Contract

An addendum updates contract terms without re‑negotiating the entire agreement, preserves existing change‑control history, and limits administrative overhead while keeping obligations clear for both parties.

Why Use a Professional Services Addendum Instead of a New Contract

Who Commonly Prepares and Signs an Addendum

Signatories usually mirror the master agreement signers: authorized officers or delegates with authority to bind their organization.

  • Account managers and delivery leads who document scope and milestones for ongoing projects.
  • Procurement or vendor management teams that track fees, billing terms, and contract renewals.
  • Legal or contract administrators who ensure compliance and authorize amendments.

Who Signs and Approves the Addendum

Engagement Manager

The Engagement Manager typically prepares the addendum language, aligns operational milestones with the client, and certifies that service deliverables reflect the agreed scope before routing for signature.

Client Legal Counsel

Client counsel reviews liability, indemnity, and change‑control language, confirms governing law and signature authority, and approves execution or recommends redlines to protect the client's interests.

Security and Compliance Elements to Check

Encryption: TLS 1.2/1.3 in transit, AES‑256 at rest
Audit Trail: Timestamps, IP, action log retained
Access Controls: Role-based permissions and SSO
HIPAA Support: BAA required for PHI workflows
21 CFR 11: Compliant options for FDA records
Retention Policy: Configurable retention and export

Essential Clauses That Belong in Every Professional Services Addendum

A clear addendum contains discrete sections that mirror the parent agreement but isolate the amended elements so both parties and auditors can quickly identify changes and responsibilities.

Scope of Work

Describe tasks, deliverables, milestones, and acceptance criteria with sufficient detail so performance obligations are measurable and contract performance disputes are minimized. Avoid vague or subjective descriptions.

Fees and Payment

Specify rates, billing schedule, invoicing rules, expenses, tax treatment, and any changes to payment terms. Include late payment remedies, interest, and whether retainers or milestone payments apply.

Term and Termination

State effective and expiration dates, renewal mechanics, and termination rights specific to the addendum, including any survivability clauses for confidentiality or indemnity provisions.

Change Control

Include a process for further changes: who may request changes, approval workflow, and how pricing or timelines are adjusted and documented in subsequent amendments.

Compliance and Data Handling

Address industry-specific requirements (for example HIPAA, FERPA), data ownership, processing instructions, and whether a BAA or data processing agreement is required.

Signatory Authority

Identify the authorized signers and any required corporate approvals; include a signature block with printed name, title, organization, and date for each party.

Step-by-Step: How to Prepare and Execute a Professional Services Addendum

Follow a simple sequence to draft, review, execute, and store the addendum so parties retain a clear, auditable record of the amendment.

  • 01
    Draft: Draft text referencing the base agreement and precise changes.
  • 02
    Stakeholder Review: Route to delivery, finance, and legal for comments.
  • 03
    Execution: Collect authorized signatures and dates from each party.
  • 04
    Record: Store the executed addendum with the master contract and retention record.

Typical Electronic Workflow for Completing an Addendum

An eSignature workflow reduces turnaround time and preserves an evidentiary trail. Keep authentication and consent levels appropriate for the transaction's sensitivity.

  • Draft and Place Fields: Insert signature, initial, and date fields in the PDF or DOCX.
  • Add Signers: Specify signer order and roles for each party.
  • Authenticate: Choose email, SMS, or stronger authentication as required.
  • Execute and Archive: Obtain signatures, capture audit trail, and save final PDF.

Configuration Checklist for an Online Addendum Workflow

Configure your eSignature workflow to match authorization, access, and retention needs before sending the document for signature.

Field Configuration
Authentication Level Email or SMS code; choose KBA where identity proofing is needed
Reminder Cadence Enable reminders at set intervals to reduce execution delays
Template Reuse Save addendum as a template for repeatable updates
Attachments Allowed Permit exhibits or SOW attachments as PDF appendices

Technical Requirements for Electronic Execution and Storage

Ensure the platform preserves an auditable certificate of completion and supports export to your document management system.

  • File Formats: PDF and Word DOCX are standard and preserve layout
  • Integrations: Connectors for Salesforce, NetSuite, or Google Workspace simplify recordkeeping
  • Authentication: Use email/SMS or higher‑assurance methods for sensitive amendments

Typical Timing and Deadlines for Addendum Processing

Identify calendar milestones to avoid performance gaps. Track negotiation windows, execution cutoffs, and billing transitions tied to the addendum.

Request Date:

Date the change request was submitted

Negotiation Window:

Recommended 7–30 days depending on complexity

Execution Deadline:

Set a firm date to avoid service interruptions

Effective Date:

Date when amended obligations begin (MM/DD/YYYY)

Billing Cutover:

Specify invoice start date and pro rata rules

Key Processing Milestones from Draft to Archive

A sequential milestone view helps project managers and contract owners track progress from drafting to formal storage.

01

Drafting Complete

All changes captured and referenced to the master agreement

02

Internal Approvals

Finance, delivery, and legal sign off on terms and pricing

03

External Execution

Parties exchange signatures and dates via chosen method

04

Final Archival

Store executed addendum with contract record and retention tags

Common Preparation and Execution Pitfalls to Avoid

  • Leaving the addendum vague about deliverables or acceptance criteria, which leads to disputes over whether obligations were met.
  • Failing to reference the correct master agreement version, creating uncertainty about which provisions remain in force.
  • Using initials or informal approvals instead of authorized signatures, risking enforceability or payment delays.
  • Not aligning billing or effective dates, causing gaps or double billing when services change mid‑period.

Risks and Consequences of an Incorrect or Incomplete Addendum

Ambiguous Obligations: Leads to disputes and potential liability
Missing Signatures: May render the amendment unenforceable
Tax Exposure: Incorrect fee characterization can trigger assessments
Data Breach Risk: Improper data handling may violate HIPAA
Late Performance: Subjects party to liquidated damages or penalties
Wrong Jurisdiction: Enforcement and remedies affected by choice of law

How a Professional Services Addendum Differs from Related Documents

Compare the addendum to common alternatives like statements of work or standalone work orders to choose the appropriate document type for changes.

Document Type Professional Services Addendum Statement of Work
Purpose amend existing contract define new project scope
References Base Agreement sometimes
Standalone Enforceability no — depends on master often yes
Typical Use modify terms specify deliverables

eSignature Vendor Pricing and Feature Snapshot for Executing Addenda

Platform cost and feature fit affect execution speed and compliance. The table lists starting prices and critical feature availability for common eSignature vendors with signNow first.

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 Varies Varies Varies
Bulk Send Yes Yes Yes Yes No
Audit Trail Yes Yes Yes Yes Yes
HIPAA Compliant Yes Yes Yes No No
Envelope Cap No cap 100 envelopes/user/year Varies Varies Varies

Real-World Examples of Addendum Use

Examples illustrate how organizations apply addenda to extend scope, address compliance, or revise fees without replacing core agreements.

Optica Ventures LLC

The team needed to add recurring services to an existing contract and document revised SLAs in an addendum.

  • The addendum referenced the master agreement.
  • The result preserved the original contract terms while clearly defining new deliverables and provided an auditable change history for operations and billing.

Martin Properties

A property management firm amended vendor responsibilities and payment timing via addendum to reduce administrative overhead.

  • It captured adjusted milestones and invoicing rules.
  • Using a single addendum allowed the firm to avoid renegotiating the entire agreement and ensured faster execution with consistent signature records.

Practical Tips for Accurate and Efficient Addendum Completion

Adopt consistent templates, include clear references to the master agreement, and use electronic workflows that preserve audit trails for compliance and dispute avoidance.

Reference the Base Agreement
Cite the original agreement title, effective date, and section numbers being modified to avoid ambiguity and ensure the addendum is interpreted as an amendment.
Use Clear Change Language
State precisely which clauses are replaced, added, or removed and provide exact replacement text to prevent conflicting interpretations.
Maintain Signature Authority Records
Document each signer's authority in procurement or corporate minutes when necessary and retain evidence of authorization alongside the executed addendum.
Preserve the Audit Trail
Keep the eSignature certificate, timestamps, and final signed PDF in your contract repository to support enforceability and records requests.

Frequently Asked Questions About Professional Services Addenda

Answers to common questions on validity, execution, and storage of addenda to reduce uncertainty during drafting and signing.


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