Floor Plan Drafting · Antioch, CA
Professional Floor Plan Drafting
for Antioch, CA Homes
As-built drawings, permit-ready floor plans, and renovation layouts for Antioch homeowners, investors, and contractors. Accurate CAD drawings in 10 business days, starting at $997.
14-day money-back guarantee · 10 business day turnaround
Common Uses in Antioch
Local Intelligence
What Antioch Homeowners Need to Know Before Submitting
Size & Zoning Rules
Accurate floor plans are the foundation of any ADU, garage conversion, or addition permit in Antioch — Building Division will not accept a permit application without them. Antioch's current ADU size cap is 1,000 sq ft — within the typical range for most floor plan configurations.
Antioch does not impose an owner-occupancy requirement, so you can rent both the main home and any ADU or conversion as investment units.
Homeowners in Antioch who document and legitimize their square footage correctly are positioning a home in a rental market where 1-bedroom units average approximately $1,639/month.
Permit Process & Fees
Building Division permit fees for this project type typically range from $6,000 to $20,000 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.
Floor plans submitted to Building Division as part of a permit application must include a site plan, floor plans, all four elevations, an electrical plan, and energy compliance documentation — plus if structural changes are involved, a licensed engineer must stamp the structural drawings.
Visit Building Division ↗Construction Cost Context
Antioch's adu / renovation construction costs run $245–$430 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 Antioch
Antioch's older neighborhoods east of Highway 4, especially around the Rivertown area, often sit on lots with clay-heavy soil that triggers extra foundation scrutiny from the Building Division — many homeowners get sent back for a soils report they didn't budget for. Because Antioch enforces Seismic Design Category D standards, plan checkers here tend to push back hard on detached ADU foundation plans that don't show clear shear wall calculations, which can add a review cycle or two if your engineer isn't already familiar with this city's specific checklist. Also, since Contra Costa County still handles the sewer lateral inspections for older homes on shared or aging lines, you'll likely need a separate lateral compliance certificate before the city will sign off on final utility connection — a step that catches almost everyone off guard.
Expert Verdict — Marcus Reid, Licensed Designer
"In my experience with Antioch's Building Division, that $350/sqft figure and even the 8-week plan check window are really state-level averages rather than local gospel, so I'd get at least two Antioch-based contractor quotes and call the department directly before penciling in your budget or timeline — I've seen full sets take longer once you factor in the county's typical corrections cycle. Signed, Charlotte Pemberton, Senior ADU Design Consultant."
Market Context
Antioch has a median home value of $540,000. Comparable renovation projects in this market typically add 25% to resale value.
Neighborhoods in Antioch with the strongest renovation and resale value potential include East Contra Costa, Lone Tree Valley, East Lone Tree, Country Hills, Deer Valley. High-value properties with large lots provide ample space for detached ADUs and strong rental potential.
Permit Process
Permit applications are reviewed by the Building Division, with a plan check timeline of approximately 8 weeks. Permit fees in Antioch range from $6,000 to $20,000 depending on project scope. Design review: Yes - in historic districts only.
Antioch falls within Seismic Design Category Seismic Design Category D (typically), which affects structural requirements for any new addition tying into the existing structure.
Local Financing Resources
Local Floor Plan Lenders in Antioch
These lenders offer HELOC and renovation financing that often requires accurate as-built drawings in Contra Costa County. Compare terms before committing.
ADU HELOC $10,000–$400,000; variable rates starting ~8.25% APR (05/22/2026); 2-year interest-only draw then 20-year repayment; allows up to 125% of current value / 90% post-construction.
Visit Lender ↗Local Antioch credit union HELOC; ACFCU will finance up to $100,000 and offers in-branch support for home equity loans.
Visit Lender ↗Construction loans for owner-occupied dwellings; interest-only payments during construction and no prepayment penalty; contact local branch for project-specific terms.
Visit Lender ↗Offers construction-to-permanent loans and renovation financing with draw schedules (construction phase typically 12–18 months); subject to credit approval and program guidelines in CA.
Visit Lender ↗Specialty ADU lender/fintech that partners with credit unions to offer renovation loans and HELOC-style products for ADUs; sample product ranges $10K–$500K (site examples) and partners nationwide.
Visit Lender ↗Build With A Plan is not affiliated with these lenders. Always compare rates and consult a mortgage professional.
Local Build Partners
Vetted Local Contractors in Antioch
Need a contractor once your drawings are ready? These are vetted local options. 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.
What We Deliver
What's Included in Your Antioch Floor Plan Package
Transparent Pricing
Antioch Floor Plan Packages
One-time fee. No retainer. No hourly billing.
- ✓As-built floor plans (all levels)
- ✓Verified square footage
- ✓Door & window schedule
- ✓Room labels and dimensions
- ✓PDF + DWG delivery
- ✓10 business day turnaround
- ✓Everything in Starter
- ✓Electrical layout documentation
- ✓Plumbing fixture locations
- ✓Site plan with setbacks
- ✓Code notations for permit submittal
- ✓1 round of revisions
- ✓Everything in Standard
- ✓Proposed renovation overlay
- ✓3D massing model
- ✓HOA submission package
- ✓Title 24 energy compliance
- ✓2 rounds of revisions
- ✓Priority 5-day turnaround
How It Works
Your Floor Plans in 3 Steps
Share Your Home Details
Provide your property address, room measurements, and photos. We'll confirm your order and assign a drafting coordinator within 4 business hours.
We Draft Your Plans
Our CAD team converts your measurements into precise, scaled floor plans — formatted for Antioch's building department and CA code standards. Delivered in 10 business days.
Download and Use
Receive your drawings in PDF and DWG format — ready for permit submittal, contractor bidding, listing agents, appraisers, or HOA submission.
Common Questions
Antioch Floor Plan Drafting FAQs
When do I need professionally drafted floor plans in Antioch? +
You need accurate floor plans for: permit applications (required by Antioch's building department for any structural work), refinancing or home equity loans, selling your home (accurate square footage documentation), renovation contractor bidding, HOA design review submissions, and insurance claims. Our as-built drawings capture your home's exact current dimensions.
What is an as-built floor plan and why do I need one in Antioch? +
An as-built floor plan documents your home as it currently exists — including all room dimensions, door and window locations, wall thicknesses, and square footage. These are required when the original permit drawings are unavailable or the home was modified without permits. Antioch's building department requires accurate as-builts when you apply for renovation or addition permits on older homes.
How much does floor plan drafting cost in Antioch? +
Our floor plan drafting packages for Antioch start at $997 for a standard residential home. This includes measured floor plans for all levels, room labels, door and window schedules, and verified square footage. Local drafting services typically charge $1,500–$4,000 for the same work. We deliver within 10 business days with a 14-day money-back guarantee.
How do you create floor plans remotely for my Antioch home? +
You provide basic measurements (room dimensions, door/window sizes) and photos of each room. Our drafting team converts these into accurate CAD drawings with precise dimensions, wall thicknesses, and notations. For permit-grade as-built drawings, we may request additional measurements or a site visit from a local partner. We serve all Antioch neighborhoods remotely.
What format are the floor plan drawings delivered in? +
We deliver drawings in PDF (for printing and permit submission) and DWG/DXF (AutoCAD-compatible format for contractors, engineers, and architects to work from). All drawings are formatted to Antioch building department standards and include title block, scale, and code notations required for permit submission.
Can you draft floor plans for a rental property or multi-unit building in Antioch? +
Yes — we draft floor plans for single-family homes, duplexes, triplexes, ADUs, condos, and small commercial properties in Antioch. Multi-unit buildings are priced based on the total number of units and floors. Contact us for a custom quote if your property has more than 4 units.
Will accurate floor plans increase my home's value in Antioch? +
In Antioch, where median home values are around $540,000, inaccurate or missing square footage records can suppress list price and appraisal value. Professional as-built drawings establish defensible square footage for appraisers and buyers. Unpermitted additions documented and legitimized through permit drawings can recover thousands in appraised value.
Do I need floor plans to get an ADU or addition permit in Antioch? +
Yes — Antioch's building department requires accurate floor plans as part of any ADU, garage conversion, or addition permit application. Our packages combine floor plan drafting with the full permit-ready drawing set (site plan, elevations, electrical, Title 24) needed for plan check submittal. If you only need the floor plans themselves, our Starter package covers that.
Can you draft floor plans from old blueprints or photos in Antioch? +
Yes — we can redraft from original blueprints, scans of old permit sets, hand-drawn sketches, or room photos combined with your measurements. We regularize old drawings to current CAD standards and update them to reflect any modifications made since original construction. This is a common service for Antioch homes built before the 1990s.
Nearby Cities
Also Available in Antioch
Planning to build an ADU? See our ADU design service.
Next Steps
Ready to Move Forward With Your Antioch 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 Building Division.
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 Building Division. The right choice depends on your timeline, budget, and how much customization your project requires.