ADU Contract Review
Before signing an ADU construction contract, verify the contractor’s license and identity, define the complete scope, connect payments to completed work, identify who handles permits, and require written approval for substitutions and change orders.
An ADU agreement should explain not only what will be built, but also what remains outside the price. Plans, engineering, utility connections, site work, finishes, inspections, cleanup, temporary protection, owner-supplied products, and correction of concealed conditions should be assigned clearly before professional ADU design and construction begins.
Before signing: Compare the contract with the approved plans, specifications, proposal, and finish schedule. Confirm payment amounts, project milestones, allowances, exclusions, warranty terms, permit responsibility, and the change-order procedure. Do not rely on verbal promises that are absent from the signed agreement.
What Should You Ask Before Signing an ADU Contract?
Ask what exact work is included, which documents control the project, who obtains permits, how selections and allowances are priced, when payments become due, and what happens when site conditions differ from the plans. The answers should appear in the written agreement or attached exhibits.
California home-improvement contracts are subject to specific consumer requirements. The contract should identify the contractor, address, and license number; state the agreed price and payment schedule; describe the work and materials; identify permit responsibility; address the anticipated completion; and contain required notices. Contract language and legal rights should be reviewed by a qualified California attorney when the project or agreement raises concerns.
Scope and Documents
Confirm which plans, engineering sheets, specifications, finish schedules, proposals, and written clarifications become part of the signed agreement.
Price and Payments
Identify the contract price, allowances, exclusions, deposits, progress-payment milestones, credits, and costs that may remain outside the builder’s proposal.
Permits and Completion
Assign responsibility for applications, corrections, agency fees, inspections, closeout documents, and obtaining approval for legal occupancy.
How Detailed Should the ADU Scope of Work Be?
The scope should be detailed enough that the homeowner and contractor can identify what is included without reconstructing the deal from text messages or sales conversations. Broad phrases such as “build ADU per plans” may not explain finish quality, utility responsibility, landscaping repair, appliance installation, permit fees, or work outside the building footprint.
Each major phase should be addressed: surveys and investigations, design coordination, demolition, grading, foundation, framing, roofing, windows, exterior finish, insulation, drywall, cabinets, counters, flooring, tile, plumbing, electrical, heating and cooling, ventilation, appliances, painting, site restoration, cleanup, inspections, and closeout.
The contract should also state whether the price includes work shown on the plans but not repeated in the proposal. When documents conflict, the agreement should establish which document controls and how discrepancies will be resolved before affected work proceeds.
A Complete Scope Limits Ambiguity
Materials, quantities, responsibilities, installation standards, exclusions, and plan references are specific enough to price and inspect.
A Vague Scope Moves Risk Later
General descriptions leave room for disagreements about utility work, finish levels, permit corrections, site restoration, and products assumed by either party.
Practical note: A drawing can show where a window belongs without identifying its manufacturer, operating type, finish, glazing package, screen, trim, or installation responsibility.
Which Plans and Specifications Belong in the Contract?
The agreement should identify the plan set by date or revision and include the documents used to establish the price. Relevant attachments may include architectural plans, structural drawings, energy documents, civil or drainage information, soils recommendations, finish schedules, cabinet layouts, product specifications, and written responses issued during bidding.
Plans often evolve during agency review. The contract should explain whether the price is based on preliminary plans, submitted plans, or permit-approved construction documents. It should also state how required plan-check revisions will be priced when they change materials, quantities, engineering, or labor.
Permit issuance may require forms, owner or contractor signatures, agency clearances, and supporting documents beyond the drawing set. Homeowners can review documents needed for an ADU permit and then confirm which party prepares, submits, updates, and pays for each item.
Documents to Identify in the Agreement
- Architectural, structural, energy, site, and applicable engineering plans.
- Written scope, exclusions, alternates, allowances, and bid clarifications.
- Finish schedule with manufacturers, models, colors, sizes, and quantities.
- Permit, plan-check, utility, inspection, and agency responsibility matrix.
- Project schedule, payment schedule, warranty terms, and change-order form.
ADU Contract Questions and Documents to Review
A useful contract review connects each homeowner question with a document, price, or responsibility. The table below highlights provisions that deserve clear written answers before work begins.
| Contract Question | Why It Matters | What to Confirm |
|---|---|---|
| What exactly is included? | Unclear scope can create disputes and added charges | Plans, specifications, quantities, labor, cleanup, and exclusions |
| How are payments scheduled? | Payments should correspond to identifiable progress | Deposit, milestones, documentation, credits, and final payment |
| Who handles permits? | Applications and corrections require clear ownership | Submittals, fees, revisions, inspections, and closeout responsibility |
| How are products selected? | Allowances and substitutions can change price and quality | Models, budgets, deadlines, approvals, tax, delivery, and installation |
| How are changes approved? | Informal changes can expand cost and schedule | Written description, price, credit, time effect, and signatures |
| What completes the project? | Physical completion may differ from legal closeout | Corrections, inspections, approvals, manuals, warranties, and cleanup |
How Should Materials and Allowances Be Written?
Material descriptions should be specific enough to distinguish the promised product from a lower-cost substitute. Appropriate details may include manufacturer, model, product line, dimensions, finish, color, performance category, quantity, installation method, and approved equivalent criteria.
An allowance should state what it covers. A cabinet allowance may or may not include handles, organizers, panels, delivery, tax, installation, or countertop support. A tile allowance may exclude grout, trim pieces, waterproofing, setting materials, waste, and labor. The homeowner should understand whether unused amounts create a credit and how overages are calculated.
The contract should prohibit unapproved substitutions or provide a written process for them. Product shortages do not make every alternative equivalent. A substitution may affect dimensions, utility rough-ins, energy documentation, warranties, appearance, maintenance, or installation labor.
How Should ADU Payments Be Structured?
The payment schedule should identify specific amounts and the work associated with each payment. California rules restrict home-improvement down payments and generally require progress payments not to exceed the value of work performed or materials delivered for the project. Homeowners should verify the current legal requirements before signing.
A milestone such as “framing payment” should explain what must be complete. Depending on the agreement, it could mean walls framed, roof framed, sheathing installed, structural hardware completed, required inspections passed, or materials merely delivered. Ambiguous milestones can lead to payment disputes.
Ask what supporting documentation accompanies each request, whether stored materials qualify for payment, who owns paid-for materials, and how deposits to suppliers are handled. The agreement should also address credits, disputed amounts, correction work, final payment, and any contractually valid retention.
An ADU budget breakdown by phase can help homeowners compare the payment schedule with the actual sequence of design, site work, structure, utilities, finishes, and closeout.
- Design, engineering, survey, testing, and preconstruction services.
- Permit, plan-check, school, utility, and other agency-related charges.
- Site work, grading, foundations, drainage, and utility connections.
- Building shell, windows, roofing, insulation, and exterior finishes.
- Mechanical, electrical, plumbing, cabinets, surfaces, and appliances.
- Corrections, final inspections, closeout documents, and site restoration.
What Should the Contract Say About Permits and Inspections?
The contract should identify who prepares and submits permit documents, responds to plan-check comments, coordinates designers and engineers, pays agency charges, schedules inspections, and corrects failed work. “Contractor obtains permits” may be too general when several agencies or utility providers are involved.
Ask whether the contractor’s price includes revisions required because the work did not follow approved plans, as opposed to revisions caused by owner changes or new agency requirements. Responsibility should also be defined when an existing unpermitted condition affects the ADU work.
Permit issuance is not project completion. The contract should explain who manages correction notices, final trade inspections, building final, required documentation, and any approval needed before lawful occupancy. The process described in final inspection requirements for ADUs should be reflected in the closeout scope.
How Should Change Orders and Concealed Conditions Be Handled?
California guidance requires changes to a home-improvement contract’s price or scope to be documented through a written change order signed before the changed work is performed. The ADU agreement should provide a standard process rather than waiting for the first disagreement.
Each change order should identify the reason, added work, deleted work, material difference, labor difference, contractor markup if applicable, revised contract amount, and schedule effect. Credits should be documented with the same care as additions.
Concealed conditions require a related but distinct process. Soil, buried utilities, undocumented drainage, deteriorated structures, unsuitable electrical service, or previous construction may differ from available records. The contract should explain notice, documentation, investigation, pricing, approval, and any emergency measures needed to protect people or property.
Do not accept a clause that makes every unknown condition automatically payable without documentation or explanation. At the same time, a contractor cannot reasonably include unlimited correction of conditions that were inaccessible and not shown in the bid documents. The agreement should allocate this risk clearly.
ADU Contract Problems to Resolve Before Signing
Do not sign when the contractor name, license number, business entity, or address is missing or inconsistent. Verify the license through the official state licensing system and confirm that the classification and status are appropriate for the proposed work.
A large lump-sum price without a defined scope is another warning sign. The proposal may appear complete while excluding utility upgrades, permit corrections, finish materials, appliances, landscaping repair, or final closeout.
Be cautious when allowances have no quantities or acceptable reference products. A low allowance can make the initial total attractive while transferring predictable selection costs to later change orders.
Verbal assurances that contradict the contract should be added in writing before signature. This includes promises about completion dates, specific workers, material brands, included fees, daily cleanup, working hours, site access, or repair of damage.
Never treat an owner-builder permit arrangement as a casual administrative shortcut. It can shift legal and project responsibilities to the property owner. The contracting and permit structure should reflect who actually controls and performs the work.
What Communication and Schedule Terms Should Be Included?
The agreement should identify the project manager or primary contact, the expected update method, meeting frequency, decision deadlines, and how formal notices must be delivered. Text messages may help with daily coordination but should not replace required written approvals.
A construction schedule should contain meaningful phases rather than only a start and finish date. It may address permitting, mobilization, site work, foundation, framing, enclosure, rough trades, insulation, drywall, finishes, inspections, and closeout. The contract should also define allowable delays and the process for documenting schedule extensions.
Homeowner decisions can affect progress. The agreement should establish selection deadlines and explain what happens when owner-supplied materials arrive late, contain defects, or do not match the approved design. Contractor-caused delays, agency review, weather, utility coordination, concealed conditions, and product availability should not be treated as the same event.
Any provision for delay damages, incentives, or schedule-related charges should be reviewed carefully for enforceability and balance. A California attorney can assess whether the proposed language reflects actual risk and applicable law.
What Warranties, Insurance, and Closeout Items Should You Request?
Ask which warranties come from the contractor, subcontractors, manufacturers, or equipment installers. The agreement should distinguish warranty length, covered work, exclusions, claim procedure, response responsibility, and whether product registration is required.
Verify contractor licensing and request current insurance information appropriate to the project. Ask how subcontractors are selected, supervised, and paid. California homeowners should also understand preliminary notices, mechanics liens, and available payment-control procedures before construction begins.
Closeout should include more than removing tools. The contract can require approved final inspections, correction of punch-list items, cleanup, keys, remotes, paint and finish information, equipment manuals, warranty documents, product registrations where applicable, final plans or approved revisions, and lien-related documentation appropriate to the payment stage.
For issues shared with other construction agreements, review general contract questions before construction. An ADU contract needs additional attention because it delivers a separate dwelling with its own utilities, inspections, equipment, and occupancy requirements.
- Sign only after the ADU scope, price, documents, and responsibilities are clear.
- Connect payment milestones to identifiable completed construction work.
- Do not rely on verbal promises or undefined material allowances.
- Legal, licensing, and concealed-condition concerns require professional review.
- Compare the contract against the final plans before signing.
Frequently Asked Questions
What should an ADU construction contract include?
It should identify the contractor and license, contract price, payment schedule, detailed scope, plans, specifications, allowances, exclusions, permit responsibility, anticipated schedule, change-order process, warranties, cleanup, and completion requirements. Required California notices and consumer disclosures must also be included where applicable. The agreement should state which attached documents control and how conflicts between plans, specifications, and proposal language will be resolved.
How can I verify an ADU contractor before signing?
Confirm the license through California’s official contractor licensing system and compare the listed name, entity, status, classification, and address with the contract. Review relevant disciplinary information and verify insurance documentation appropriate to the project. Ask who will supervise daily work and which major trades will be subcontracted. References and completed projects are useful, but they do not replace license and contract verification.
How should ADU progress payments be written?
Each payment should state a specific amount and the construction milestone that makes it due. Milestones should describe completed work clearly enough to inspect, rather than using vague labels such as “phase payment.” Confirm how delivered or stored materials are handled, what documentation accompanies a request, and how credits or disputes affect payment. The schedule must comply with current California home-improvement contract requirements.
Who should obtain the ADU building permits?
The contract should assign this responsibility explicitly. A licensed contractor may obtain construction permits within the agreed scope, while designers and engineers may prepare and revise supporting documents. The agreement should also identify who pays fees, answers plan-check comments, coordinates utility approvals, schedules inspections, and closes the permit. Homeowners should understand the consequences before accepting an owner-builder role.
How should material allowances be listed in an ADU agreement?
List the category, quantity, allowance amount, acceptable reference product, and items covered by that amount. State whether tax, shipping, waste, accessories, fabrication, and installation are included. The contract should explain how overages and unused balances are calculated and approved. An allowance that says only “flooring” or “fixtures” provides too little information to judge whether the initial contract price matches the expected finish level.
What should an ADU change order contain?
A change order should describe the reason, added and deleted work, product changes, labor difference, applicable markup, credits, revised contract amount, and schedule effect. It should be approved in writing before the changed work begins, subject to limited circumstances involving immediate protection or safety. Photographs, revised drawings, and supporting estimates may be appropriate when a concealed condition causes the change.
Should the ADU contract include a guaranteed completion date?
The agreement should provide the required timing information and explain how delays and extensions are handled. A date without defined assumptions may be misleading when permit review, utility coordination, owner decisions, concealed conditions, weather, or material availability affect progress. Ask for phase milestones, notice requirements, documentation of delay, and a procedure for revising the schedule. Have any penalty or damages clause reviewed for legal enforceability.
What should happen before the final ADU payment?
The contract should identify the conditions for final payment. These may include completion of contracted work, correction of punch-list items, required final inspections, site cleanup, delivery of manuals and warranties, keys and controls, finish information, and appropriate lien-related documents. Confirm whether legal occupancy requires additional agency approval beyond physical completion. Final payment should follow the agreement and applicable California payment and lien procedures.
