Floor Plan Drafting · San Antonio, TX
Professional Floor Plan Drafting
for San Antonio, TX Homes
As-built drawings, permit-ready floor plans, and renovation layouts for San Antonio 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 San Antonio
Local Intelligence
What San Antonio Homeowners Need to Know Before Submitting
Size & Zoning Rules
Accurate floor plans are the foundation of any ADU, garage conversion, or addition permit in San Antonio — Development Services Department will not accept a permit application without them. San Antonio's current ADU size cap is 1,600 sq ft — generous enough to accommodate most project types.
San Antonio currently requires owner-occupancy on the primary parcel — meaning one of the units (the main home or the ADU/conversion) must be your primary residence.
Homeowners in San Antonio who document and legitimize their square footage correctly are positioning a home in a rental market where 1-bedroom units average approximately $1,024/month.
Permit Process & Fees
Development Services Department permit fees for this project type typically range from $2,000 to $8,000 depending on project valuation and scope. Plan check runs approximately 15 weeks — though each correction cycle adds 3–6 weeks, which is why code-compliant drawings matter so much.
Floor plans submitted to Development Services Department 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 Development Services Department ↗Construction Cost Context
San Antonio's adu / renovation construction costs run $195–$293 per square foot — a moderate 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 San Antonio
If your lot falls inside one of San Antonio's older inner-loop neighborhoods, like Monte Vista or Government Hill, you may need a Historic Design Review from the Office of Historic Preservation before Development Services will even look at your plans, which can tack on 4-6 extra weeks and often requires matching roof pitch and exterior materials to the main house. SAWS (San Antonio Water System) is another sneaky cost: many older lots have undersized water taps, and SAWS will require a tap upgrade fee that can run $2,000-$5,000 before they'll approve a new sewer connection for the ADU. Also, if your property still has a septic system rather than SAWS sewer, Bexar County requires an OSSF (On-Site Sewage Facility) inspection and possible system redesign, which is a separate approval process that generic ADU guides never mention.
Expert Verdict — Marcus Reid, Licensed Designer
"In my experience, that $275/sqft and 15-week figure read like San Antonio-wide estimates rather than a verified quote for your specific lot, so I'd get a couple of local contractor bids and call Development Services Department directly before penciling in a start date. With HOA presence sitting at 45%, don't overlook that layer either — I've seen HOA design review add just as much delay as the city's own plan check process."
Market Context
San Antonio has a median home value of $215,000. Comparable renovation projects in this market typically add 22.0% to resale value.
Neighborhoods in San Antonio with the strongest renovation and resale value potential include Monte Vista, Tobin Hill, Southtown (King William/Southtown), King William, Dignowity Hill. Large lots near Trinity University and central location make detached ADUs feasible and attractive to renters.
Permit Process
Permit applications are reviewed by the Development Services Department, with a plan check timeline of approximately 15 weeks. Permit fees in San Antonio range from $2,000 to $8,000 depending on project scope. Design review: Yes - in historic districts and individual landmarks.
San Antonio falls within Seismic Design Category Seismic Design Category A (SDC A), which affects structural requirements for any new addition tying into the existing structure.
Local Financing Resources
Local Floor Plan Lenders in San Antonio
These lenders offer HELOC and renovation financing that often requires accurate as-built drawings in Bexar County. Compare terms before committing.
Offers a 15-year draw period with a maximum 80% CLTV for primary residences in Texas.
Visit Lender ↗Provides a 10-year draw period and up to 15-year repayment, capped at 80% of appraised value per Texas law.
Visit Lender ↗Offers secured loans up to $2,000,000 with the potential to finance 75% of improvement costs.
Visit Lender ↗A two-time close loan featuring a 12-month interest-only phase and a 15% down payment requirement.
Visit Lender ↗A one-time close construction loan that combines construction financing and the permanent mortgage into one.
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 San Antonio
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 San Antonio Floor Plan Package
Transparent Pricing
San Antonio 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 San Antonio's building department and TX 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
San Antonio Floor Plan Drafting FAQs
When do I need professionally drafted floor plans in San Antonio? +
You need accurate floor plans for: permit applications (required by San Antonio'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 San Antonio? +
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. San Antonio'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 San Antonio? +
Our floor plan drafting packages for San Antonio 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 San Antonio 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 San Antonio 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 San Antonio 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 San Antonio? +
Yes — we draft floor plans for single-family homes, duplexes, triplexes, ADUs, condos, and small commercial properties in San Antonio. 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 San Antonio? +
In San Antonio, where median home values are around $215,000, 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 San Antonio? +
Yes — San Antonio'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 San Antonio? +
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 San Antonio homes built before the 1990s.
Nearby Cities
Also Available in San Antonio
Planning to build an ADU? See our ADU design service.
Next Steps
Ready to Move Forward With Your San Antonio 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 Development Services 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 Development Services Department. The right choice depends on your timeline, budget, and how much customization your project requires.