What is a material substitution approval?

It records the originally specified product, the proposed replacement, the reason for the change, material differences, technical review, price and schedule effects, warranty changes, and the customer's decision before the substitute is purchased or installed.

Who approves a construction product substitution?

Customer approval may be only one required decision. The contract, permit documents, manufacturer instructions, and local rules may also require review by a designer, engineer, inspector, supplier, manufacturer, or authority having jurisdiction.

Contractor field guide · Free template

Don’t approve an “equivalent.” Approve the differences.

Q: Is an equivalent product automatically acceptable?

No. Equivalence depends on the project requirements and may involve appearance, dimensions, performance, certification, compatibility, warranty, permit documents, and review by a designer, engineer, manufacturer, inspector, or authority having jurisdiction.

Q: Does a material substitution need a change order?

Often it should be documented as or attached to a change order when it changes the contract's products, price, scope, warranty, or schedule. Exact requirements depend on the contract and applicable law.

When the specified product is unavailable, delayed, discontinued, or no longer practical, compare the proposed substitute in terms the customer and project team can actually evaluate.

Use the template Compare products

13 minute read
Updated July 10, 2026
Product changes

Substitution review 01 Compare the actual products, data, and installation conditions before approval.

The short answer

A substitution approval documents a changed product decision.

Identify the exact original product, the exact proposed substitute, why the change is requested, and every meaningful difference in appearance, dimensions, performance, certification, installation, maintenance, availability, price, schedule, and warranty.

Customer acceptance does not establish technical equivalence. Required technical, design, manufacturer, permit, or code review remains a separate gate.

Side-by-side review

Compare what matters on this job.

Attach product data, samples, photos, and written findings. Mark unknowns as unknown instead of presenting assumptions as facts.

01
Identity and reason
Record both manufacturers, model numbers, finishes, and quantities. Explain whether the trigger is availability, lead time, damage, design, cost, or field compatibility.
02
Appearance and dimensions
Compare color, pattern, texture, profile, thickness, size, tolerances, transitions, and visible variation using actual samples where practical.
03
Performance and certification
Compare ratings, capacity, materials, listings, evaluation reports, efficiency claims, installation instructions, and conditions of use.
04
Installation and adjacent work
Identify changed preparation, fasteners, adhesives, labor, accessories, clearances, substrate, controls, trim, or future service requirements.
05
Commercial effect and approvals
State price credit or addition, lead time, schedule effect, warranty differences, and every required customer or technical approval.

Copyable template

Material substitution approval

Use one approval per related substitution set. Attach supporting records rather than compressing technical differences into “same or better.”

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Request no. [___]Product comparison

Project & affected scope: [Customer, property, room/area, contract item, drawing/specification or selection reference]
Originally specified: [Manufacturer, product, model/SKU, finish, size, quantity, quoted source]
Reason for substitution: [Unavailable, discontinued, lead time, damage, compatibility, price, design revision, or customer request]
Proposed substitute: [Manufacturer, product, model/SKU, finish, size, quantity, proposed source]
Appearance & dimensional differences: [Color, grain/pattern, texture, profile, thickness, dimensions, tolerances, and sample/photo references]
Performance & compliance differences: [Materials, ratings, capacity, certification/listing, evaluation report, efficiency, and conditions of use]
Installation impact: [Preparation, labor, accessories, controls, fasteners/adhesives, transitions, adjacent work, or maintenance]
Price effect: [Credit $___ / addition $___ / no change; include tax, freight, restocking, labor, and related work]
Schedule effect: [Original and substitute lead times; revised milestone or completion effect]
Warranty & service: [Product and workmanship coverage differences, claim route, replacement availability, and exclusions]
Required reviews: [Designer, engineer, manufacturer, supplier, inspector, permit revision, or authority approval; status and reference]
Decision boundary: [Approval authorizes only the described substitute; additional changes require separate written approval]

Customer / authorized representativeSignature & date

ContractorSignature & date

Adapt this operational template to the contract, design documents, product, trade, and jurisdiction. It is not legal advice or a technical equivalency determination.

Three completed examples

Show the decision, not just the replacement name.

Flooring

Discontinued oak plank

Original: 7-inch, 12 mm light oak. Substitute: 7.5-inch, 10 mm warmer oak. New transition profiles and 2-day lead-time improvement; sample and price credit attached.

Plumbing

Unavailable shower valve trim

Original: selected trim in brushed finish. Substitute: same manufacturer’s current series. Rough valve compatibility confirmed in writing; handle shape and warranty term differ.

Exterior

Alternate composite decking

Original: specified capped board. Substitute: alternate profile and fastening system. Color sample, evaluation report, span/fastener review, labor addition, and designer approval required.

Four stop points

Customer preference cannot answer every technical question.

Design

Structural or assembly change

Route load path, span, fire, weather, waterproofing, or engineered-system changes to the qualified project professional.

Permit

Approved documents differ

Determine whether the permit set, energy documentation, product approval, or inspector review must change.

System

Manufacturer compatibility

Confirm components, substrates, accessories, controls, and instructions when a system warranty or listing depends on them.

Claim

Certification is part of the sale

Verify the exact model in the relevant directory when efficiency, safety listing, or evaluation-report status matters.

Research basis

Specific products and verifiable claims matter.

California CSLB advises that home-improvement contracts describe products in detail, including style, manufacturer, model, quality, and quantity, and says covered price or scope changes must be documented through written change orders signed before changed work begins. Oregon CCB’s public sample change order likewise provides fields for the changed work, price, schedule, and acceptance.

For technical claims, use the record relevant to the product. ICC-ES evaluation reports identify evaluated products, code provisions, installation guidance, and conditions of use. ENERGY STAR’s Product Finder identifies certified products by model and features. UL Product iQ provides certification information and alternate-product search. These directories support review; they do not replace project-specific approval.

This guide provides general operational information. It does not establish product equivalence, code compliance, design adequacy, warranty coverage, or legal sufficiency for a particular project.

Material substitution questions

Is an “equivalent product” automatically acceptable?

No. Compare the project’s actual requirements and obtain every required technical and contractual review. Similar marketing language does not prove matching dimensions, ratings, compatibility, installation, or warranty.

Does a material substitution need a change order?

Often it should be documented as or attached to one when the contract’s products, price, scope, schedule, or warranty changes. Follow the contract and applicable local requirements.

Who approves the substitute?

The customer’s decision may be only one step. Designers, engineers, manufacturers, inspectors, permit authorities, or other qualified parties may also need to review it.

What if the substitute saves money?

Show the full credit calculation, including material, freight, restocking, labor, accessories, and related work. Record whether the customer receives a credit and whether schedule or warranty terms also change.

Before ordering

Put the product comparison beside the signature.

Describe the original and substitute, attach samples and data, record every effect, and send the customer a JobSign approval before purchase or installation.

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