How much does ADU design cost? For most detached accessory dwelling units in the United States, total professional design fees range from $4,000 to $18,000, depending on unit size, site complexity, and whether you hire an independent drafter, an architectural firm, or a dedicated plan package provider. While catalog floor plans sell online for as little as $800 to $2,000, those preliminary layouts lack site-specific engineering, foundation calculations, and Title 24 energy documentation required to pass municipal plan check. A truly permit-ready design package includes architectural drawings, structural engineering calculations, energy compliance certificates, and a custom site plan that satisfies local zoning ordinances.
::: callout-direct-answer Direct Answer: What Does ADU Design Cost? Complete permit-ready ADU architectural design typically costs between $4,000 and $12,000 for standard detached units (400 to 1,000 square feet) using a drafting firm or turnkey design service. Hiring a traditional licensed architect for a custom high-end build runs between $12,000 and $25,000+ (or 8% to 15% of projected construction cost). Standalone structural engineering adds $1,500 to $4,500 if not bundled into your designer's fee, and Title 24 energy documentation costs $350 to $650. Online pre-drawn floor plans look inexpensive at $1,000, but require an additional $4,000 to $8,000 in localized drafting, engineering stamps, and site planning before any city agency will accept them. :::
Homeowners planning their first secondary dwelling often experience sticker shock when reviewing design proposals. Alternatively, they fall into the opposite trap: purchasing an inexpensive downloadable floor plan online, only to find the local building department rejecting it at intake.
Understanding what goes into an ADU drawing set, what licensed professionals charge, and which additional site studies can add costs protects your budget from expensive delays.
Quick Cost Reference: ADU Design and Engineering in 2026
| Design Component / Delivery Model | Typical Cost Range | Included Deliverables | City Acceptance Status |
|---|---|---|---|
| Stock Online Plan (Catalog) | $800 to $2,500 | Generic floor plans and exterior elevations | Not submittal-ready (requires local engineering, site plan, energy report) |
| Freelance Drafter / CAD Specialist | $3,000 to $7,000 | Architectural plan set, basic elevations, sections | Partial (engineering, energy calcs, and city submission usually excluded) |
| Full-Service Licensed Architect | $12,000 to $25,000+ | Custom concept design, full construction documents, finish schedules | Submittal-ready, but hourly revisions and engineering markups increase total |
| Turnkey Plan Service (Build With A Plan) | $6,000 flat | Full architectural set, structural engineering, Title 24, site plan, permit handling | Submittal-ready package (revisions included until city accepts submission) |
| Standalone Structural Engineering | $1,500 to $4,500 | Foundation design, framing schedules, shear walls, PE/SE stamp | Required supplement when hiring drafters or adapting stock plans |
| Title 24 Energy Compliance Report | $350 to $650 | CF1R documentation, compliance software output | Mandatory for all permitted California ADUs |
| Boundary / Topographic Survey | $2,000 to $5,000 | Property boundaries, grade elevations, utility locations | Required on sloped lots or tight property lines (paid to surveyor) |
What Must Be in a Complete Permit-Ready ADU Drawing Set?
A local building safety division does not review artistic concept sketches. City plan checkers enforce the International Residential Code (IRC) and state building standards, such as Title 24 in California. To approve a building permit, plan examiners require a comprehensive, coordinated set of construction documents.
If your designer delivers drawings without any of these core components, your permit application will face immediate rejection or receive an extensive list of plan check correction notices.
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| ANATOMY OF A COMPLETE PERMIT-READY ADU DRAWING SET |
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| 1. ARCHITECTURAL SET (Sheets A1.0 - A5.0) |
| - Cover sheet, sheet index, project directory, applicable code editions |
| - Dimensional floor plans with door/window schedules and room egress paths |
| - Exterior elevations showing building height, plate height, and roof pitch |
| - Building cross-sections detailing wall assemblies, insulation, and framing |
| - Architectural details (waterproofing, flashing, fire-rated assemblies) |
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| 2. SITE & ZONING PLAN (Sheet SP-1) |
| - Scaled lot layout with property lines, primary home, and proposed ADU |
| - Setback dimensions (rear, side, street) and distances between structures |
| - Lot coverage calculations, floor area ratio (FAR), and open space data |
| - Utility trench routes (sewer lateral, water line, electric service, gas) |
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| 3. STRUCTURAL ENGINEERING PACKAGE (Sheets S1.0 - S3.0 + Calc Book) |
| - Foundation plan (stem wall, slab-on-grade, or pier footing specifications) |
| - Floor, ceiling, and roof framing plans with member sizes and joist spacing |
| - Lateral force resisting system (shear walls, hold-downs, plywood nailing) |
| - Structural calculations binder stamped and wet-signed by a licensed PE/SE |
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| 4. MECHANICAL, ELECTRICAL & PLUMBING SCHEMATICS (Sheets MEP-1 - MEP-3) |
| - Electrical lighting, receptacle, and smoke/CO alarm layouts |
| - Panel schedule, service load calculations, and solar/PV interconnection |
| - Plumbing single-line diagram with water supply, drain-waste-vent (DWV) sizes |
| - HVAC equipment sizing, heating/cooling distribution, and ventilation fans |
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| 5. MANDATORY ENERGY DOCUMENTATION (State Specific) |
| - Title 24 CF1R compliance forms registered through an approved registry |
| - Envelope insulation R-values, fenestration U-factors, and SHGC ratings |
| - Heat pump water heater and space conditioning compliance data |
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1. Architectural Floor Plans, Elevations, and Sections
The architectural sheets establish the layout, room dimensions, natural light and ventilation compliance, ceiling heights, door and window schedules, and emergency egress paths. They also illustrate exterior finishes, roof pitch, overall building height, and fire-resistant construction details for exterior walls built close to property lines.
2. Dimensioned Site Plan and Zoning Analysis
Your city planning department examines the site plan before building officials ever review wall framing. The site plan displays property boundary lines, existing house footprints, driveway locations, proposed ADU placement, exact setback distances, tree protection zones, and utility trench connections. Without an accurate site plan tied to your specific parcel, no permit can be issued.
3. Structural Engineering Calculations and Stamped Plans
The secondary keyword adu structural engineering cost represents one of the largest variables in plan preparation. A licensed civil or structural engineer must calculate gravity loads (roof weight, snow loads, live loads) and lateral forces (wind gusts, seismic activity). The engineer specifies concrete foundation depth, rebar spacing, structural headers over wide patio doors, post-and-beam connections, and shear wall nailing schedules. The engineer must stamp and sign each structural sheet and provide a matching calculation notebook.
4. Mechanical, Electrical, and Plumbing (MEP) Plans
Many jurisdictions allow general notes on architectural sheets for straightforward single-story ADUs, but increasingly, building departments require dedicated MEP layouts. These show lighting layouts, electrical outlet spacing, Arc-Fault and Ground-Fault circuit breakers, main panel load calculations, plumbing drain-waste-vent (DWV) runs, sewer tie-in points, water heater specifications, and HVAC equipment details.
5. Energy Code Compliance Documentation
In states with rigorous energy mandates like California, every new residential structure requires an official energy calculation report (Title 24 Part 6). An energy consultant models the ADU in state-certified software to verify that insulation levels, window performance ratings, heat pump heating and cooling systems, and water heating meet state efficiency targets.
The 4 ADU Design Delivery Models Compared
When homeowners evaluate adu design cost, they generally choose among four distinct paths. Each option involves different balances of upfront expense, homeowner time commitment, and risk of municipal rejection.
ADU DESIGN DELIVERY MODELS: COST VS. HOMEOWNER BURDEN
High Cost +
Low Burden | [Traditional Architect]
| $12,000 - $25,000+
| Custom design, high fees
|
| [Build With A Plan]
| $6,000 Flat Package
| Turnkey submittal set
| Engineering included
| Revisions included
|
| [Freelance Drafter]
| $3,000 - $7,000
| Requires separate engineer
| Homeowner manages city
Low Cost + | [Online Stock Plan]
High Burden | $1,000 - $2,500
| Generic only, high hidden costs
+------------------------------------------------------------->
Incomplete Scope ---------------------> Complete Turnkey Scope
Option 1: Online Pre-Drawn Stock Plans ($800 to $2,500)
Websites advertising "Permit-Ready ADU Plans for $995" sell downloadable PDF packages originally drafted for a generic flat lot under standard national code templates.
- The Reality: A stock plan is never immediately submittal-ready for your specific property. It contains no site plan, no utility connection routes, and no site-specific foundation engineering based on your local soil conditions, seismic zone, or wind exposure.
- The Hidden Expense: By the time you hire a local draftsman to draw your site plan ($1,000 to $2,000), hire a structural engineer to recalculate the foundation and frame ($2,500 to $4,000), and pay an energy consultant for Title 24 calcs ($500), your "$1,000 plan" ends up costing between $5,000 and $8,500. Furthermore, you must personally manage the building department intake counter.
- Best For: Homeowners who want early conceptual layout ideas or seasoned general contractors who possess in-house drafting resources.
Option 2: Independent Drafter or CAD Designer ($3,000 to $7,000)
An independent draftsperson or residential designer prepares custom architectural plans using computer-aided design software. They take your project requirements, measure your yard, and produce floor plans, elevations, and roof layouts.
- The Reality: Most drafters are not licensed professional engineers (PE) or licensed structural engineers (SE). When the city requires structural calculations or a stamped foundation plan, the drafter must outsource the structural engineering to a third-party engineer.
- The Hidden Expense: Drafters typically exclude structural engineering fees, Title 24 reports, and permit submittal coordination from their base contract. If the city issues corrections, some drafters charge hourly rates ($75 to $150 per hour) to revise the drawings.
- Best For: Homeowners who feel comfortable acting as their own project coordinator, finding an independent engineer, and managing communication with the building department.
Option 3: Full-Service Licensed Architect ($12,000 to $25,000+)
A licensed residential architect provides bespoke design services, guiding you through multiple rounds of conceptual brainstorming, material selection, window placement, and interior detailing.
- The Reality: Architects charge either a fixed fee ($12,000 to $25,000 for an ADU), an hourly rate ($150 to $300+ per hour), or a percentage of the total construction cost (usually 8% to 15%). On a $200,000 ADU build, a 10% architectural fee equals $20,000.
- The Hidden Expense: Many architectural firms focus on luxury custom homes. They may design complex roof angles, custom steel moment frames, or recessed window details that drive construction costs significantly higher. Unless explicitly written into the contract, engineering consultant fees are often billed to the client as an extra pass-through cost with a 10% to 15% administrative markup.
- Best For: Homeowners with unlimited budgets seeking an architecturally unique showpiece that integrates complex geometry into an atypical hillside property.
Option 4: Turnkey Plan and Permitting Service ($6,000 Flat)
A turnkey plan manager bridges the gap between an expensive custom architect and an incomplete freelance drafter. Dedicated providers like Build With A Plan focus exclusively on secondary dwellings.
- The Reality: The entire pre-construction package is bundled into a single predictable fixed fee. Architectural drawings, full structural engineering calculations, energy documentation, custom site planning, and permit submittal handling are managed under one roof.
- The Build With A Plan Difference: The Backyard Wealth Package costs a flat $6,000, about what an architect charges just to start. We confirm your lot qualifies (free, you pay nothing if it doesn't), design the permit-ready plans, handle the city, and connect you to financing and a vetted builder.
- Best For: Homeowners who want a streamlined, predictable process, fixed pricing, and the assurance that plans will pass municipal intake without surprise engineering markups.
Detailed Breakdown: ADU Permit Drawings Cost by Discipline
To evaluate any quote you receive, look at the individual line items. Understanding typical market rates for each technical discipline prevents you from overpaying or underestimating your pre-construction budget.
TYPICAL DISCIPLINE COST ALLOCATION ($8,500 TOTAL BUDGET)
+---------------------------------------------+---------+
| Discipline | Cost |
+---------------------------------------------+---------+
| Architectural Drafting & Planning | $3,800 |
| Structural Engineering & PE Stamp | $2,600 |
| Dimensioned Site Plan & Utility Routing | $1,000 |
| Title 24 Energy Compliance Modeling | $500 |
| Permit Application Coordination & Filing | $600 |
+---------------------------------------------+---------+
Architectural Drafting Fees ($2,500 to $6,000)
The base architectural set constitutes roughly 40% to 50% of the total design effort. This includes initial zoning research, site layout, schematic floor plans, building elevations, cross sections, roof framing diagrams, door and window schedules, and interior cabinet and fixture placements. Most residential CAD drafters charge between $3.00 and $7.00 per square foot for basic plans, while licensed design firms charge $8.00 to $16.00 per square foot.
ADU Structural Engineering Cost ($1,500 to $4,500)
The specific adu structural engineering cost depends directly on the structural complexity of your build:
- Simple Detached Box on Flat Lot (Single-Story): $1,500 to $2,500. Standard slab-on-grade foundation, conventional wood-framed walls, prefabricated roof trusses, and standard shear wall panels.
- Two-Story ADU or Unit Over Garage: $2,800 to $4,500. Requires engineered floor joists, point load calculations transferring second-story weights through first-story walls, structural steel posts, and seismic hold-down hardware.
- Complex Hillside or Expansive Soil Foundation: $3,500 to $6,000+. Involves stepped concrete footings, grade beams, caissons, or engineered retaining walls integrated into the ADU structure.
Engineers charge flat project fees or hourly rates ranging from $150 to $275 per hour. When you hire an independent engineer, make sure their proposal includes answering building department plan check questions; otherwise, they may charge you an additional hourly fee for every revision letter.
Title 24 and Energy Modeling ($350 to $650)
Energy calculations require dedicated modeling software (such as CBECC-Res or EnergyPro). The consultant inputs your ADU's wall construction, insulation R-values, window dimensions, orientation relative to true north, HVAC equipment efficiencies, and water heater specifications. In California, the resulting document (the CF1R form) must be officially registered with an approved HERS registry (such as CalCERTS or CHEERS) before submission.
City Permitting and Plan Check Coordination ($500 to $2,000)
Submitting plans to the local building and planning department is not a simple one-hour task. It requires completing municipal application forms, compiling utility load declarations, uploading documents through electronic plan review (EPR) portals, tracking inter-agency reviews (fire, public works, health, sanitation), and responding to examiner correction notices. While some architects charge their standard hourly rate for this administrative tracking, turnkey services include permit management within their baseline scope.
What Costs Extra? Common Site-Specific Studies and Government Fees
No design professional, whether an architect, drafter, or package provider, can control external site conditions or municipal taxes. Homeowners must budget separately for site-specific technical reports and local government fees.
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| TYPICAL PRE-CONSTRUCTION ADD-ONS |
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| 1. BOUNDARY OR TOPOGRAPHIC SURVEY ($2,000 - $5,000) |
| - Needed when lot lines are uncertain or setbacks are tight (e.g., 4 feet) |
| - Mandatory for sloped hillside properties with more than 5 feet of fall |
| - Performed by a licensed Professional Land Surveyor (PLS) |
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| 2. GEOTECHNICAL / SOILS INVESTIGATION ($3,000 - $6,500) |
| - Soil boring and laboratory analysis of load-bearing capacity |
| - Required in liquefaction zones, landslide areas, or unstable fill soils |
| - Performed by a licensed Geotechnical Engineer (GE) |
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| 3. CIVIL ENGINEERING & DRAINAGE PLAN ($1,500 - $3,500) |
| - Low Impact Development (LID) stormwater retention calculations |
| - Grading and cut/fill earthwork balance sheets |
| - Required when adding substantial impermeable surface area |
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| 4. MUNICIPAL PERMIT & IMPACT FEES ($1,500 - $8,000+) |
| - Building plan check fee and building permit issuance fees |
| - School district impact fees (statutory exemption for units under 500 sq ft) |
| - Utility connection or capacity charges (water meter, sewer hookup) |
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1. Land Boundary and Topographic Surveys
If your parcel has clear, recorded boundary markers and sits on a flat grade, your designer can usually produce a site plan using official county parcel maps and satellite data. However, a licensed land survey becomes mandatory if:
- You are building within inches of minimum 4-foot rear or side setbacks.
- Property corners are disputed or unrecorded.
- The lot has noticeable slope (usually greater than a 5-foot elevation drop across the building footprint). A professional land surveyor (PLS) charges between $2,000 and $5,000 to shoot boundary stakes and create an AutoCAD topographic file.
2. Geotechnical (Soils) Engineering Reports
Building departments in hillside areas, coastal zones, or mapped geologic hazard zones (such as liquefaction or landslide zones) will not accept standard prescriptive foundation designs. They require a licensed geotechnical engineer to drill test borings, evaluate soil bearing capacity, check for expansive clay, and issue specific foundation recommendations. A soils report costs between $3,000 and $6,500.
3. Civil Engineering and Stormwater Drainage Plans
When adding a new roof and concrete patio, you alter how rainwater drains off your property. Many cities require a Low Impact Development (LID) plan or stormwater management calculation showing how runoff will infiltrate the soil rather than flooding neighboring yards or overloading municipal storm sewers. A civil engineer charges $1,500 to $3,500 for a drainage and grading plan.
4. City Plan Check, Permit, and Utility Impact Fees
Do not confuse design costs with city permit fees. Design fees pay the professionals who draw and engineer your plans. City permit fees pay municipal examiners and inspectors to review the plans and inspect the construction site.
- Plan Check Fee: $800 to $2,500 (paid when submitting plans for review).
- Building Permit Issuance Fee: $1,200 to $3,500 (paid when picking up the approved permit).
- School Impact Fees: Under California law, ADUs under 500 square feet are exempt from school impact fees. ADUs of 500 square feet or larger can be assessed school fees on the entire square footage (typically $3.00 to $5.00+ per square foot).
- Utility Connection Fees: If you choose to install a separate water meter or electrical meter for a rental unit, utility companies charge connection and capacity fees ranging from $1,500 to $8,000+.
How Plan Check Corrections and Revision Fees Escalate Costs
The initial price quoted on a design contract is rarely the final price paid if the agreement contains open-ended revision terms.
When your plans are submitted to the building department, the city assigns them to multiple departmental reviewers: Planning, Building and Safety, Fire, Public Works, and Environmental Services. It is completely normal for examiners to return a "Plan Check Correction Notice" listing 15 to 40 specific technical questions or requests for drawing clarifications.
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| THE REVISION COST TRAP: TWO APPROACHES |
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| SCENARIO A: THE HOURLY DESIGNER OR ARCHITECT |
| - Initial Contract: $5,000 for preliminary plan set |
| - City issues 28 correction items after 6 weeks of review |
| - Architect bills 16 hours @ $175/hr to update architectural sheets = $2,800 |
| - Structural engineer bills 6 hours @ $225/hr to revise calculations = $1,350 |
| - Second round of minor corrections bills another 4 hours = $700 |
| > TOTAL REAL COST: $9,850 ($4,850 in surprise revision charges) |
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| SCENARIO B: TURNKEY FIXED PACKAGE (BUILD WITH A PLAN) |
| - Flat Fee: $6,000 all-inclusive |
| - City issues 28 correction items after 6 weeks of review |
| - Architectural updates completed at $0 extra charge |
| - Structural calculation updates completed at $0 extra charge |
| - Building department liaison handles responses until permit readiness is achieved|
| > TOTAL REAL COST: $6,000 (Submittal-ready, free revisions included) |
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When hiring a designer, always ask: "Are municipal plan check corrections included in your flat fee, or are they billed hourly?" If corrections are billed hourly, an apparently cheap $4,000 drafting quote can easily inflate into an $8,000 or $10,000 expense before your permit is approved.
The Build With A Plan Solution: The Backyard Wealth Package
Build With A Plan was established to remove uncertainty, hidden engineering markups, and revision traps from the ADU pre-construction process.
Instead of leaving homeowners to piece together drafters, structural engineers, energy consultants, and permit runners, we provide a unified, predictable service:
- The Backyard Wealth Package: A flat $6,000, about what an architect charges just to start.
- Complete Scope: We confirm your lot qualifies (free, you pay nothing if it doesn't), design the permit-ready plans, handle the city, and connect you to financing and a vetted builder.
- Our Deliverables Guarantee: We guarantee your drawings will be accepted for submission by your city, or we revise them free until they are. And if your property doesn't pass our free feasibility check, you pay nothing.
- True Risk Reversal: We won't even take your money unless your property qualifies.
Build With A Plan designs permit-ready documents, manages the permit application process, and connects homeowners to financing partners and vetted local builders. We do not perform construction ourselves. Homeowners pay government fees directly to their local building departments, while construction costs are paid directly to their chosen licensed general contractor.
To explore our complete service specifications, review our package details or read our guides on pre-approved ADU plans and the ADU building permit process.
Drawing Package Comparison Worksheet
Before signing a contract or paying a deposit to any designer, architect, or online plan seller, use this checklist to verify exactly what is included in your scope of work.
| Deliverable or Service Requirement | Online Stock Plan ($1,000) | Freelance Drafter ($4,500) | Traditional Architect ($16,000) | Backyard Wealth Package ($6,000) |
|---|---|---|---|---|
| Custom Property Feasibility Review | No | Rare | Yes (Billed Hourly) | Yes (Free upfront check) |
| Custom Floor Plan and Exterior Elevations | Generic Only | Yes | Yes (Bespoke) | Yes (Tailored layout) |
| Site Plan with Setbacks and Lot Coverage | No | Often Extra ($500+) | Yes | Yes (Included) |
| Utility Routing and Connection Plan | No | Sometimes | Yes | Yes (Included) |
| Structural Calculations and PE Stamp | No | Excluded ($2,500 extra) | Often Extra Markup | Yes (Fully stamped set) |
| Title 24 Energy Compliance (CF1R) | No | Excluded ($400 extra) | Often Outsource Fee | Yes (Registered report) |
| Permit Application Portal Submission | No | No (Homeowner task) | Sometimes Extra | Yes (Managed for you) |
| Plan Check Correction Revisions | No | Billed Hourly | Billed Hourly | Yes (Included free) |
| Fixed Price Policy | Fixed for PDF only | Rare | Rarely fixed | Yes ($6,000 Flat) |
| Financing and Vetted Builder Introductions | No | No | Rare | Yes (Included) |
Frequently Asked Questions About ADU Design Costs
How much do ADU permit drawings cost?
A complete set of permit drawings for an ADU typically costs between $4,000 and $12,000 when prepared by a professional drafting company or turnkey plan provider. This includes architectural drawings, site plans, structural engineering calculations, and energy documentation. If you hire a full-service custom architect, expect fees between $12,000 and $25,000+.
Can I draw my own ADU plans to save money?
While most building departments technically allow property owners to draft plans for their own single-family residential properties under Owner-Builder provisions, drawing your own ADU plans is rarely practical. Modern ADU submittals require precise structural calculations, seismic shear wall schedules, foundation engineering, and Title 24 energy compliance modeling that must be stamped by licensed professionals. Self-drafted plans almost universally face rejection during municipal intake.
Is structural engineering always required for an ADU?
Yes. Every new residential structure, whether attached or detached, requires structural engineering to demonstrate compliance with local building codes for gravity, seismic, and wind loads. Even if a drafter draws the architectural layouts, a licensed civil or structural engineer must calculate and stamp the foundation, framing, and roof load paths before the city will issue a building permit.
Why do architects charge so much more than turnkey plan services?
Traditional architects provide highly customized, one-of-a-kind designs. They hold multiple discovery meetings, draft bespoke architectural details, select custom interior finishes, and bill hourly for all client consultations and site visits. Turnkey services like Build With A Plan optimize proven floor plan geometries, streamline engineering calculations, and focus specifically on code compliance and permit approval, delivering permit-ready documents at a fraction of the cost.
Are city permit fees included in my ADU design cost?
No. Design fees cover the professional labor required to measure, draw, calculate, and engineer your construction documents. City plan check fees, building permit fees, school impact fees, and utility connection charges are municipal taxes paid directly by the homeowner to local government agencies.
How long does it take to design permit-ready ADU plans?
Custom architectural firms typically take 8 to 16 weeks to progress from initial conceptual sketches to finished construction documents. Turnkey design providers that specialize exclusively in ADUs typically complete permit-ready drawings and structural calculations in 3 to 6 weeks. After plans are completed, building department plan check reviews typically take an additional 4 to 12 weeks depending on the city.
Next Steps for Homeowners
Before you spend thousands of dollars on architectural drawings or commit to an expensive design retainer, verify that your lot can legally accommodate the unit you envision.
Power line easements, sewer main locations, oak tree protection ordinances, and local zoning overlays can dictate where and how an ADU can be placed on your property.
::: callout-summary
Start with a Free Feasibility Check
Avoid spending money on plans that your city cannot approve. With Build With A Plan, we verify your property first. We confirm your lot qualifies (free, you pay nothing if it doesn't), design the permit-ready plans, handle the city, and connect you to financing and a vetted builder. We guarantee your drawings will be accepted for submission by your city, or we revise them free until they are. And if your property doesn't pass our free feasibility check, you pay nothing. We won't even take your money unless your property qualifies.