Can an add-on be signed electronically?

Yes. Electronic signatures are generally valid under the ESIGN Act and UETA when intent, consent, attribution, and reliable record retention are present; include an audit trail to document the signing events.

Who must sign the add-on?

Authorized signatories under the original agreement should sign. If a third-party agent signs, attach proof of authority or board resolution to prevent enforceability challenges.

Is notarization required for validity?

Not typically for commercial design add-ons. Notarization may be requested for evidentiary reasons or where state law or a contract clause requires it; confirm if a specific state or counterparty insists on notarization.

What if the client wants changes after signing?

Treat new requests as a subsequent add-on or amendment. Avoid informal email changes; execute a new signed addendum to document additional obligations and fees.

How should I store executed add-ons?

Retain a tamper-evident PDF and the associated audit trail with the original contract. Store copies in contract management and accounting systems for at least the applicable retention period.

Can an add-on alter the original agreement’s key terms?

Yes, but explicit language is required. State which clauses of the original contract are amended, and include a savings clause confirming all other terms remain in effect unless expressly changed.

Electronic Signature
Templates
Miscellaneous
Design Add-On Agreement

Design Add-On Agreement

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

DESIGN ADD-ON AGREEMENT

Parties

Client Name: Client Address: Service Provider Name: Service Provider Address:

Recitals

WHEREAS, Client and Service Provider entered into a Design Services Agreement dated (the "Original Agreement");

WHEREAS, Client desires to obtain additional design services and enhancements as described in this Add-On Agreement, and Service Provider is willing to provide such additional services on the terms and conditions set forth herein;

WHEREAS, the parties intend for this Design Add-On Agreement to supplement and, where inconsistent, modify the Original Agreement for the scope and fees stated below.

Scope of Work

Service Provider shall perform the additional design services, deliverables and related work described below (collectively, the "Add-On Services") in accordance with the timelines and milestones set forth in this Agreement.

Detailed Description of Add-On Services: Deliverables:

Payment Terms

In consideration for the Add-On Services, Client shall pay Service Provider the fees and expenses set forth below. Except as expressly modified herein, all billing, invoicing and payment provisions of the Original Agreement shall remain in effect.

Total Add-On Fee (USD): Payment Schedule / Milestones: Invoice Due (days after invoice):

Late payments shall accrue interest and fees as set forth below. Client shall also be responsible for reasonable collection costs, including attorneys' fees, incurred by Service Provider in collecting overdue amounts.

Grace Period for Late Payment (days): Late Fee (percent per month):

Term and Termination

This Add-On Agreement shall commence on the Start Date below and, unless earlier terminated in accordance with this Agreement, shall continue until the End Date below or until completion of the Add-On Services, whichever occurs first.

Start Date: End Date: Termination Notice Period (days):

Either party may terminate this Add-On Agreement for material breach by the other party if such breach remains uncured after the notice period specified above. Termination shall not relieve Client of the obligation to pay for services performed and costs incurred through the effective date of termination.

Confidentiality

"Confidential Information" means non-public information disclosed by a party in connection with this Add-On Agreement that is designated as confidential or that reasonably should be understood to be confidential. Each party shall (a) use Confidential Information solely to perform its obligations or exercise its rights under this Agreement; (b) restrict disclosure to employees, contractors or agents with a need to know; and (c) use at least the same degree of care to protect Confidential Information as it uses for its own confidential information, but no less than reasonable care.

Confidential Information does not include information that (i) is or becomes generally known to the public through no wrongful act of the receiving party; (ii) is rightfully received from a third party without restriction; or (iii) is independently developed by the receiving party without use of the disclosing party's Confidential Information. Upon termination or request, the receiving party shall return or destroy Confidential Information and certify such return or destruction in writing if requested.

Confidentiality Term (years):

Intellectual Property; Ownership

Unless otherwise agreed in writing, Service Provider hereby assigns to Client all right, title and interest in the final deliverables created specifically for Client under this Add-On Agreement upon Client's full payment of all amounts due. Service Provider retains ownership of its pre-existing intellectual property, templates, processes and general skills, and grants Client only a license to incorporate such pre-existing materials to the extent they are included in the deliverables.

Governing Law

This Add-On Agreement shall be governed by and construed in accordance with the laws of the state identified below, without regard to conflict of laws principles.

Governing State:

Miscellaneous

This Add-On Agreement, together with the Original Agreement, constitutes the entire agreement between the parties with respect to the Add-On Services and supersedes all prior and contemporaneous agreements and understandings related thereto. Any amendment or modification must be in writing and signed by both parties.

If any provision of this Add-On Agreement is held invalid or unenforceable, the remaining provisions will remain in full force and effect. Neither party may assign this Agreement without the prior written consent of the other, except to an affiliate or in connection with a merger or sale of substantially all assets, provided such assignee assumes the assigning party's obligations.

Additional Terms (optional):

Client Printed Name:

By:

Date:

Service Provider Printed Name:

By:

Date:

What a Design Add-On Agreement Is and Why It Matters

A Design Add-On Agreement is a written amendment or supplement to an existing design contract that records additional scope, deliverables, timelines, fees, or changes in responsibilities. It converts informal change requests into a discrete, binding attachment to the original agreement, clarifying acceptance criteria, revision limits, intellectual property assignment, and payment terms. When executed by authorized signers and retained with the main contract, the add-on provides evidence of mutual consent and reduces disputes about scope, schedule, and compensation while preserving auditability for invoicing and compliance.

Why adding a formal Design Add-On Agreement reduces risk

Using a written addendum avoids scope creep, sets clear payment terms, documents client approvals, and creates an auditable record of changes that supports dispute resolution and invoicing.

Who typically creates and signs a Design Add-On Agreement

The add-on is used by the parties who executed the original design contract and any authorized agents responsible for scope or payment changes.

Design agencies and freelance designers who need formal change orders after project commencement.
Clients or product owners approving extra features, revisions, or accelerated delivery.
General contractors or vendors adding design-related services to an existing construction or renovation contract.

Each signer should have authority under the underlying agreement and be identified in the document to avoid challenges to enforceability.

Essential elements to include in a professional Design Add-On Agreement

A well-drafted add-on keeps the original agreement intact while isolating the change details so both parties can review and approve modifications quickly.

Scope

Describe precisely what additional design work is included, reference specific deliverables, and attach exhibit sheets or sketches when helpful.

Deliverables

List files, formats, resolution, and acceptance criteria so there is no ambiguity about what constitutes a completed deliverable.

Timeline

State milestone dates and the impact of delays, including client review windows and revision turnarounds.

Fees

Specify fixed price or hourly rates, payment schedule, deposits, and expense reimbursement with currency and tax treatment.

IP & Rights

Explain ownership, license grants, or assignment of newly created design work and any retained rights by the designer.

Signatures

Include signature blocks with printed names, titles, dates, and explicit statement that the add-on amends the original agreement.

Step-by-step: complete and execute a Design Add-On Agreement

Follow a short sequence from drafting to archiving to keep changes organized and enforceable.

01

Draft add-on: Record scope, schedule, fees, and exhibits.
02

Review internally: Confirm authority, budget, and impact on main contract.
03

Obtain signatures: Use written or e-signatures with signer authentication.
04

Archive copy: Store with the original contract and distribution list.

Configuring an online workflow for the Design Add-On Agreement

Set up a repeatable template and automated routing to minimize manual steps and ensure consistent approvals.

Field	Configuration
Template creation	Save add-on as a reusable template with required fields.
Signer authentication	Choose email, SMS code, or stronger methods as needed.
Conditional fields	Show payment or correction fields only when triggered.
Notifications	Auto-notify parties on completion or when action is overdue.

Where to send or file the executed add-on

Decide routing in advance: one retained original, one for each party, and copies for accounting and project management.

Client copy: Send signed PDF to client email on record.
Designer copy: Store in designer’s contract repository.
Accounting: Provide invoice-ready signed copy to finance.
Project folder: Attach signed add-on to the project management system.

Digital signing and file format considerations

Use a platform that supports industry-standard file formats, audit trails, and appropriate signer authentication for your risk level.

File formats: PDF, DOCX, and flattened PDF accepted.
Integrations: CRM and cloud storage connectors available.
Authentication: Email, SMS, or stronger methods supported.

Retain a tamper-evident final PDF and an audit trail showing signer identity, timestamps, and actions for evidentiary support.

Typical timelines and payment deadlines for add-ons

Set clear, enforceable deadlines for approvals, payments, and deliverables so the add-on’s timeline integrates with the main project schedule.

Client approval window:

5–10 business days for review unless otherwise agreed.

Deposit due:

Typically due on signature or within 7 days.

Milestone delivery:

Dates tied to scope items and acceptance tests.

Final payment:

Due on final delivery or within 30 days.

Revision period:

Specify number of revisions and response timelines.

Key milestones from change request to final delivery

A typical add-on moves through a small number of discrete milestones to limit delays and clarify responsibilities.

01

Request Submitted

Change request documented and scoped.

02

Add-On Drafted

Draft prepared and reviewed by both parties.

03

Signatures Obtained

Authorized signers execute the add-on.

04

Work Completed

Deliverables submitted and accepted per criteria.

Common mistakes to avoid when preparing an add-on

Vague scope language that omits acceptance criteria and file formats leads to disagreements and rework costs.
Failing to tie the add-on to the original contract’s reference number or effective date creates enforceability confusion.
Using initials only or informal email confirmations instead of properly executed signatures can impair evidence in disputes.
Not updating invoices and the project budget to reflect the add-on results in delayed payments and accounting errors.

Potential legal and commercial risks of an incorrect add-on

Breach damages: Monetary exposure for missed obligations.

Payment disputes: Delayed or withheld payments.

IP uncertainty: Ownership disputes over deliverables.

Tax consequences: Incorrect billing affects reporting.

Enforceability gaps: Missing signatures weaken legal standing.

Regulatory exceptions: Certain documents cannot be e-signed.

Security and compliance basics to protect signed add-ons

In transit: TLS 1.2/1.3

At rest: AES-256 encryption

Audit trail: Timestamped signer logs

Regulatory: ESIGN and UETA

Healthcare: HIPAA (BAA required)

Certification: SOC 2 Type II

eSignature vendor pricing snapshot for executing add-ons

Compare baseline pricing and key capabilities when selecting an eSignature provider to execute and store Design Add-On Agreements electronically.

	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 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

Real-world examples of add-on workflows in practice

Two brief examples show how organizations turn change requests into signed, auditable add-ons to keep projects moving.

Optica Ventures LLC — Brian Fitzgibbons

A small services firm needed a quick design scope increase documented for client approval

The team used a short add-on to capture new deliverables
"The interface is simple and easy-to-use for our team; more importantly, it is just as easy for our customers."

Martin Properties — Tim Martin

A property manager added a branding refresh mid-project and required faster execution

The add-on aligned payment milestones with the updated schedule
"I can process and execute all of these documents online with 100% compliance and built-in security."

Practical tips for accurate and efficient add-on completion

Adopt a consistent process and template to reduce errors, speed approvals, and make add-ons easy to audit and enforce.

Use a standard template

Maintain one clear add-on template referencing the original contract, exhibits, and signature blocks to reduce drafting time and legal review scope.

Limit ambiguity

Replace vague terms like 'as needed' with measurable acceptance criteria, file types, and exact revision counts to avoid rework.

Record approvals

Capture approvals with dated signatures or secure e-sign audit trails that log signer identity, timestamp, and IP to support enforcement.

Coordinate invoicing

Align accounting entries and invoice numbers with the add-on to prevent payment delays and simplify bookkeeping reconciliation.

Frequently asked questions about Design Add-On Agreements

Answers to common concerns about signing, enforceability, and practical issues when using add-ons with the original contract.

Need help? Contact support

Can an add-on be signed electronically?
Yes. Electronic signatures are generally valid under the ESIGN Act and UETA when intent, consent, attribution, and reliable record retention are present; include an audit trail to document the signing events.
Who must sign the add-on?
Authorized signatories under the original agreement should sign. If a third-party agent signs, attach proof of authority or board resolution to prevent enforceability challenges.
Is notarization required for validity?
Not typically for commercial design add-ons. Notarization may be requested for evidentiary reasons or where state law or a contract clause requires it; confirm if a specific state or counterparty insists on notarization.
What if the client wants changes after signing?
Treat new requests as a subsequent add-on or amendment. Avoid informal email changes; execute a new signed addendum to document additional obligations and fees.
How should I store executed add-ons?
Retain a tamper-evident PDF and the associated audit trail with the original contract. Store copies in contract management and accounting systems for at least the applicable retention period.
Can an add-on alter the original agreement’s key terms?
Yes, but explicit language is required. State which clauses of the original contract are amended, and include a savings clause confirming all other terms remain in effect unless expressly changed.

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