Custom ADU Builder Concord
Compare custom scope, site constraints, model options, finish level, construction sequence, and written pricing before selecting a build approach.
Contra Costa County · California
Concord ADU design & construction
Concord offers both free City plans and designer-owned preapproved plans. Their licensing and review costs differ, while local height guidance specifically addresses BART and the Clayton Road transit corridor.
Full-service ADU construction
Custom ADU builder & contractor services in Concord
Start with a custom ADU builder or ADU contractor in Concord, then coordinate design, architecture, engineering, permits, budgeting, construction, inspections, and handoff around the property.
ADU Contractor Concord
Coordinate construction scope, subcontractors, schedule, inspections, site logistics, and closeout around a clearly defined permitted set.
ADU Design Build Concord
A coordinated design-build workflow keeps property review, design, engineering, permitting, budgeting, procurement, and construction aligned.
ADU Design Concord
Develop the floor plan, exterior direction, material selections, functionality, and site fit before committing to engineering and construction.
ADU Architect Concord
Architectural planning can address layout, massing, code constraints, site relationships, and permit drawings where an appropriately licensed professional is required.
ADU Engineer Concord
Engineering coordination can cover structural, foundation, utility, civil, energy, and other disciplines required by the property and permitting authority.
Local planning guide · Reviewed October 2, 2026
What matters for an ADU in Concord
Permitting authority: City of Concord — ADUs
Official local guidanceLocal rules and design checks
| Topic | Local guidance |
|---|---|
| Transit and height | Concord’s regulations identify higher detached-ADU height allowances near BART or Clayton Road, subject to the stated conditions. |
| Exempt-unit screening | Its regulations describe a qualifying detached unit of 800 square feet or less with four-foot side and rear setbacks. |
| Plan ownership | Free City plans and separately licensed designer plans are different program choices. |
Selected local requirements, not a complete zoning determination. Confirm the current rules for your address with the responsible agency.
Fees and budget checks
Concord says typical plan-check fees are waived for listed designer preapproved plans, but hourly site-plan review and designer licensing charges remain. Obtain permit and other agency charges separately.
Concord designer preapproved-plan feesHow to start the permit process
For a custom design, meet with a planner, prepare drawings and required forms, then apply for the building permit. For a standard design, follow the corresponding City-plan or designer-plan instructions.
Plan resource
Concord’s free standardized construction plans
The City offers free preapproved drawings with site-specific review. The published process still requires the homeowner’s site plan.
View the original sourceConcord ADU questions
- Are all Concord preapproved plans free?
- No. The City distinguishes its free plans from designs licensed directly by their creators.
- Does proximity to Clayton Road matter?
- Concord’s height guidance names that transit corridor. Have Planning verify the applicable distance and design conditions.
Sources for this guide
- City of Concord — ADUs
- Concord designer preapproved-plan fees
- Concord’s free standardized construction plans
- Concord ADU regulations
- Custom ADU permit process
Local sources reviewed October 2, 2026. Historical examples retain their stated dates. Contact ADU California Inc. to confirm project availability; this guide does not establish an office location or property approval.
A useful first review
Separate what is available from what still needs verification.
01
Confirm the property
Start with a complete address and review the available parcel, building, and map context.
02
Identify the unknowns
Keep missing setbacks, easements, utilities, access, hazards, and local requirements visible.
03
Choose the next review
Use the preliminary result to prepare a focused conversation with the required professionals and agencies.
Explore project types
Compare the scope before choosing a solution.
These pages explain the questions each project type introduces. They do not assert that a particular scope is permitted or suitable for your address.
Compare planning footprints
See common ADU sizes before choosing a design.
These model pages are planning references only. They are not a statement that a particular size is allowed or buildable at a Concord address.
California directory
Explore more city guides.
The next useful action
Put your address at the center of the conversation.
The online review is preliminary and is not a permit decision, survey, engineering opinion, construction document, final price, or guaranteed schedule.