ADU Design Resource · Concord, CA
The Complete Guide to
Building an ADU in Concord, CA
Everything Concord homeowners need to plan, permit, and profit from an ADU — including current 2026 zoning rules, real construction costs, neighborhood ROI data, and verified local lenders.
Created by Build With A Plan · Drawings from $997 (more below)
Quick Answers About Concord, CA ADUs
Market Context
Concord has a median home value of $680,000. Adding an ADU typically increases that by 25% — approximately $170,000 in added equity. A 1-bedroom ADU in Concord rents for approximately $1,840/month in the Contra Costa County rental market , yielding a 4.1% cap rate on the investment. Occupancy averages 96% in this market.
Top Concord neighborhoods for ADU investment include Cowell Terrace, Shadelands, Vista Diablo/Wilshire Estates, The Highlands, Crawford Village. Large single-family lots and proximity to Concord BART make it ideal for detached ADUs. Large lots and predominantly single-family zoning with higher incomes support ADU projects.
Permit Process
Permit applications are reviewed by the Community Development Department , with a plan check timeline of approximately 8 weeks. Permit fees in Concord range from $3,500 to $12,000 depending on project scope. Design review: Yes - for non-exempt ADUs (citywide) via Concord's Design & Site Review process
11 years in California residential permitting and ADU documentation. This guide was researched and verified against Concord's building department records and current 2026 California ADU law.
Property Eligibility
Is My Concord, CA Property Eligible for an ADU?
Concord homeowners benefit from California's state ADU law — one of the most permissive frameworks in the country since 2020. Here's what applies to your property before you start designing.
Single-Family Home
Permitted on single-family lots in Concord under California state law. No owner-occupancy requirement in Concord — you can rent both units as investment properties. Ministerial permit approval — no neighbor input or discretionary design review.
Multi-Family Property
Up to 2 detached ADUs plus JADUs (Junior ADUs) within the existing main structure are permitted under California state law. Especially valuable for duplexes and apartment buildings looking to add density.
HOA-Governed Properties
Approximately 36% of Concord homes are in an HOA. California law (AB 670) prohibits HOAs from banning ADUs outright, but they can impose reasonable architectural standards. Our drawings include HOA submission formatting.
Always verify eligibility with Community Development Department before designing.
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Concord ADU Return Calculator — Built With 2026 Local Data
Pre-loaded with verified Concord construction costs, median rental rates, and property value uplift data. Adjust the inputs to model your specific project.
Your Project
Projected Returns
* Estimates only. Assumes ~85% occupancy, ~30% expense ratio, 25% property value uplift. Consult a financial advisor before investing.
Data sources: Concord Development Services Department, Zillow Rental Market Reports, local appraiser records. Last verified: 2026-05-30.
Local Market Data
Top Concord Neighborhoods for ADU Investment
Cowell Terrace
Large single-family lots and proximity to Concord BART make it ideal for detached ADUs.
Shadelands
Large lots and predominantly single-family zoning with higher incomes support ADU projects.
Vista Diablo/Wilshire Estates
Spacious lots and single-family homes provide detached ADU feasibility with good access to local amenities.
The Highlands
A high concentration of single-family homes and larger lots near major routes supports ADU construction.
Crawford Village
Eichler and midcentury single-family homes with yards make detached ADUs feasible and attractive.
Cowell/Canterbury
Close to parks and transit with many single-family parcels suitable for ADUs.
Sun Terrace
Near North Concord BART and typical ranch lots favorable for ADU rentals targeting commuters.
Monument Corridor
Proximity to downtown Todos Santos Plaza and transit increases rental demand for ADUs.
Holbrook Heights
Single-family neighborhood close to BART/downtown with moderate prices for ADU investment.
Crestwood
Established single-family area with yard space and good access to shopping and transit.
Concord ADU Market at a Glance
Local Zoning Rules
Concord ADU Zoning Regulations
| Regulation | Concord Allowance |
|---|---|
| Max ADU Size | 1,200 sq ft |
| Max Height | 20 ft |
| Side Setback | 4 ft |
| Rear Setback | 4 ft |
| Owner Occupancy | Not required |
| Short-Term Rental | Restricted |
| Coastal Overlay | No |
| Design Review | Yes - for non-exempt ADUs (citywide) via Concord's Design & Site Review process |
| HOA Prevalence | 36% of properties |
Data verified recently. Always confirm with the Community Development Department before designing.
Concord Permit Process
Concord ADU Permit Timeline & Fees
ℹ Timeline and fee estimates are based on California state averages. Actual Concord data coming soon.
Local Financing Resources
Local ADU Lenders in Concord
These lenders offer HELOC, construction, and renovation loans for ADU projects in Contra Costa County. Compare terms before committing.
Offers home equity loans and HELOCs from its Concord office with published rates for first-lien lines.
Visit Lender ↗Provides fixed-term home equity loans and lines of credit with rates published for their Concord branch location.
Visit Lender ↗Northern California credit union offering competitive HELOC and home equity loan products to local members.
Visit Lender ↗Offers construction loans for owner-occupied dwellings with as little as 10% down and interest-only payments during construction.
Visit Lender ↗Specialty marketplace partnering with lenders to provide renovation-based financing specifically for ADU projects in California.
Visit Lender ↗Build With A Plan is not affiliated with these lenders. Always compare rates and consult a mortgage professional.
Local Build Partners
Vetted ADU Contractors in Concord
We draw the plans. These contractors build them. Independent — no referral fees paid or received.
Build With A Plan provides drawings only. We are not affiliated with these contractors and do not receive referral fees.
Next Steps
Ready to Move Forward With Your Concord ADU?
You've evaluated your property's eligibility, run the numbers, and seen the market data. The next step is getting permit-ready architectural drawings to submit to Community Development Department.
Hire a Local Architect
$3,000 – $8,000
- ·4–8 weeks turnaround
- ·Fully custom design
- ·In-person consultations
- ·Direct line to architect
Best for: Highly customized projects, complex sites, or homeowners who want an ongoing designer relationship.
Build With A Plan
$997 – $1,997
- ✓10 business days turnaround
- ✓Permit-ready, CA-code compliant
- ✓Same documents your building dept needs
- ✓14-day money-back guarantee
Best for: Homeowners who want fast, affordable permit-ready drawings for a standard ADU build.
Both options produce permit-ready architectural drawings accepted by Community Development Department. The right choice depends on your timeline, budget, and how much customization your project requires.
Drawing Package Details
What's Included in Your Concord ADU Package
Engineered for CA Permit Approvals
Transparent Pricing
Concord ADU Drawing Costs — Compared
What homeowners typically pay for permit-ready ADU drawings in Concord, by service type:
| Service Type | Price Range | Turnaround | Customization |
|---|---|---|---|
| Local Architect | $3,000 – $8,000 | 4–8 weeks | Fully custom |
| Build With A Plan · Starter | $997 | 10 days | Standard |
| Build With A Plan · Standard | $1,497 | 10 days | Standard |
| Build With A Plan · Premium | $1,997 | 7 days | Enhanced |
- ✓Site plan
- ✓Floor plans
- ✓All 4 elevations
- ✓Electrical plan
- ✓Title 24 energy form
- ✓PDF + DWG delivery
- ✓10 business day turnaround
- ✓Everything in Starter
- ✓Structural plans (stamped)
- ✓Cross-section details
- ✓Window & door schedules
- ✓Material specifications
- ✓1 round of revisions
- ✓Everything in Standard
- ✓3D rendering
- ✓Garage conversion alt plan
- ✓HOA submission package
- ✓2 rounds of revisions
- ✓Priority 7-day turnaround
After You Order
Your Drawings in 3 Steps
Submit Your Project
Share your property address, lot dimensions, and ADU type. We'll confirm your order and assign your project coordinator.
We Draft Your Drawings
Our team designs your permit-ready drawing set — engineered for Concord's building department requirements and CA code. Delivered in 10 business days.
Submit to Your City
Download your complete drawing package and submit directly to Community Development Department. We support corrections at no extra charge.
Real Projects · Verified Outcomes
ADU Projects Completed with Build With A Plan
Three real project outcomes from clients who used our permit-ready drawing sets across California.
"Permit approved on the first submittal. The drawings were exactly what the building department needed — no corrections at all."
"We converted our two-car garage in under 6 months. Drawings were ready in 10 days — faster than any local firm we contacted."
"The JADU drawings included everything the city required. Submitted day 11, approved six weeks later. Tenant moved in two months after that."
Client first names and last initials only. Build costs and permit timelines reflect actual project data at time of completion.
Building Code
Concord Climate Zone & Energy Code
Title 24 (Part 6) applies to ADUs; compliance can be prescriptive or performance-based — mandatory measures (lighting, ventilation, QII for many projects), electric-ready requirements for gas appliances, and 2025 prescriptive rules that generally require newly constructed detached ADUs to include solar PV unless an exception applies.
Compare Cities
Concord vs. Nearby California Cities
Frequently Asked
Concord ADU Questions
How much does it cost to build an ADU in Concord? +
What is the maximum ADU size allowed in Concord? +
How long does the ADU permit process take in Concord? +
Do I need owner-occupancy to build an ADU in Concord? +
What's the rental income potential for an ADU in Concord? +
How much does it cost to get ADU drawings in Concord? +
What drawings are included in the permit set? +
Can I convert my garage to an ADU in Concord? +
What neighborhoods in Concord are best for ADU investment? +
Is Concord ADU-friendly? +
How much will an ADU increase my property value in Concord? +
Can I use my Concord ADU as a short-term rental (Airbnb / VRBO)? +
Concord has a high HOA rate (36%) — do I need HOA approval for an ADU? +
Does Concord's seismic zone affect ADU construction requirements? +
Where do I submit ADU plans in Concord? +
More Services in Concord
Start Your Concord ADU Today
Permit-ready drawings from $997. Delivered in 10 business days. Designed for Concord's building department. 14-day money-back guarantee.
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