Home Addition Drawings · Concord, CA
Permit-Ready Home Addition
Drawings for Concord, CA
Expand your home with a permitted room addition, second story, or family room extension. We deliver complete, code-compliant drawing sets for Concord's building department — in 10 business days, starting at $1,497.
14-day money-back guarantee · 10 business day turnaround
Local Intelligence
What Concord Homeowners Need to Know Before Submitting
Size & Zoning Rules
Any new square footage added to your Concord home counts against the same zoning envelope that governs ADU size, meaning large additions may affect your ability to add a future ADU. Concord's current ADU size cap is 1,200 sq ft — generous enough to accommodate most project types.
Concord does not impose an owner-occupancy requirement, so you can rent both the main home and any ADU or conversion as investment units.
If the addition creates a second unit or is later converted to a rental, Concord's ADU market supports approximately $2,300/month for a 2-bedroom unit.
Permit Process & Fees
Community Development Department permit fees for this project type typically range from $3,500 to $12,000 depending on project valuation and scope. Plan check runs approximately 8 weeks — though each correction cycle adds 3–6 weeks, which is why code-compliant drawings matter so much.
Addition permit packages submitted to Community Development Department must include a site plan, floor plans, all four elevations, an electrical plan, and energy compliance documentation — plus stamped structural drawings are always required for any load-bearing elements, second-story work, or new foundation.
Visit Community Development Department ↗Construction Cost Context
Concord's home addition construction costs run $315–$490 per square foot — a wide range driven by labor markets, local code complexity, and finish level. Our drawings are priced at a fraction of what a full-service architect would charge to produce the same permit set.
⚠ Common Pitfall in Concord
Concord's Community Development Department will run your address through the ASCE Hazard Tool using a default soil classification, and because that default assumes worse soil than many lots actually have, a lot of homeowners get bumped into Seismic Design Category D (or even E) structural requirements that add engineering costs and redesign time nobody budgeted for. If your contractor doesn't push back and request a site-specific soil study early, you can end up over-engineering the foundation and paying for it. Also worth knowing: Concord won't let you rent the ADU short-term, so if your financing plan leaned on Airbnb income to pencil out the project, that math needs to change before you break ground.
Expert Verdict — Marcus Reid, Licensed Designer
"In my experience with Concord submittals, that $450/sqft figure and the 8-week plan check window read like state-level averages rather than what I see on the ground here, so I'd treat both as a starting point and get actual bids from local contractors plus a direct call to Concord's Community Development Department before penciling out your budget or schedule. Even with a clean 8-week estimate, I've watched plenty of first-time drawing sets bounce back for corrections, so build in a cushion rather than banking on that timeline holding."
Market Context
Concord has a median home value of $680,000. Comparable renovation projects in this market typically add 25% to resale value.
Neighborhoods in Concord with the strongest home addition and resale value potential 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.
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.
Concord falls within Seismic Design Category Seismic Design Category (A–F): site-specific. Per City of Concord guidance use the ASCE Hazard Tool with default Site Soil Class = 'Default' (effectively conservative for C/CD/D) and then determine SDC per ASCE 7 / 2025 CBC; many Concord addresses will be SDC D (some may be E)., which affects structural requirements for any new addition tying into the existing structure.
Local Financing Resources
Local Home Addition Lenders in Concord
These lenders offer HELOC, construction, and renovation loans for home addition 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 Home Addition Contractors in Concord
We draw the plans. These contractors build the addition. 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.
Drawing Package Details
What's Included in Your Concord Home Addition Package
Transparent Pricing
Concord Home Addition Drawing Packages
One-time fee. No retainer. No hourly billing.
- ✓Site plan
- ✓Floor plans (existing + proposed)
- ✓All 4 elevations
- ✓Electrical plan
- ✓Title 24 energy compliance
- ✓PDF + DWG delivery
- ✓10 business day turnaround
- ✓Everything in Starter
- ✓Stamped structural drawings
- ✓Foundation plan
- ✓Roof framing plan
- ✓Window & door schedules
- ✓1 round of revisions
- ✓Everything in Standard
- ✓3D rendering
- ✓Cross-section details
- ✓Material specifications
- ✓HOA submission package
- ✓2 rounds of revisions
- ✓Priority 5-day turnaround
After You Order
Your Addition Drawings in 3 Steps
Submit Your Project Details
Share your property address, existing floor plan (if available), and the addition scope. We assign your project coordinator within 4 business hours.
We Draft Your Drawings
Our team designs your complete addition drawing set — engineered for Concord's building department requirements and CA CBC code. Delivered in 10 business days.
Submit to Your Building Dept
Download your complete package and submit to Community Development Department. We support plan check corrections at no extra charge.
Common Questions
Concord Home Addition FAQs
Do I need a permit for a home addition in Concord? +
Yes — any structural addition to your home in Concord requires a building permit. This applies to room additions, second-story additions, sunrooms, and attached garages. You'll need permit-ready drawings before the building department will accept your application. Our packages are formatted specifically for Concord's submittal requirements.
How much does a home addition cost in Concord? +
Home additions in Concord typically cost between $300.0–$400 per square foot depending on the scope, finishes, and structural complexity. A 600 sq ft addition ranges from $180,000 to $240,000. Second-story additions cost more than ground-floor extensions due to structural requirements. Our drawing packages start at $1,497 — a fraction of local architectural fees.
What drawings are required to permit a home addition in Concord? +
Concord's building department requires: a site plan showing the addition's footprint and setbacks, floor plans for all affected levels, all four exterior elevations, an electrical plan, and energy compliance (Title 24 in California). Structural plans stamped by a licensed engineer are required for any load-bearing elements — included in our Premium package.
How long does the permit process take for a home addition in Concord? +
Plan check in Concord typically takes 8 weeks for home additions. Additions with structural components may require additional review. Complete, code-compliant drawings significantly reduce correction cycles — each cycle adds 3–6 weeks. Our drawings are engineered to pass on the first submittal.
What setbacks apply to home additions in Concord? +
Concord enforces minimum setbacks from property lines for all additions: typically 4–5 ft side setbacks and 5 ft rear setbacks, though these vary by zoning district and lot size. Your addition must stay within the buildable envelope. Our site plan documents existing and proposed setbacks and flags any zoning variances required.
Do I need structural drawings for a home addition in Concord? +
Yes, for most additions. Any load-bearing walls, new foundations, second-story construction, or roof structure changes require stamped structural drawings from a licensed engineer. California's CBC (California Building Code) and seismic requirements make structural plans mandatory for most addition types. Our Standard and Premium packages include stamped structural drawings.
How much do home addition drawings cost in Concord? +
Our permit-ready home addition drawing packages for Concord start at $1,497. Local architects and designers typically charge $3,000–$10,000+ for comparable drawing sets. Every package is engineered for CA code compliance and formatted for Concord's building department. Turnaround is 10 business days with a 14-day money-back guarantee.
Will a home addition increase my home's value in Concord? +
In Concord, where median home values are approximately $680,000, a permitted home addition adds square footage that appraisers value as part of the home's gross living area. Return on investment varies by addition type — master suite additions, family room expansions, and additional bedrooms typically recoup 50–75% of project cost in appraised value in CA markets.
Can I add a second story to my home in Concord? +
Second-story additions are permitted in most Concord residential zones, subject to height limits and design review requirements. California generally requires ministerial permit approval, but some cities impose design compatibility or neighborhood compatibility review for second stories. Our drawings cover all levels including foundation upgrades, shear walls, and roof framing required for vertical additions.
Nearby Cities
Also Available in Concord
Adding an ADU instead? See our ADU design service.
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 – $2,997
- ✓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.