Home Addition Drawings · McKinney, TX
Permit-Ready Home Addition
Drawings for McKinney, TX
Expand your home with a permitted room addition, second story, or family room extension. We deliver complete, code-compliant drawing sets for McKinney's building department — in 10 business days, starting at $1,497.
14-day money-back guarantee · 10 business day turnaround
Local Intelligence
What McKinney Homeowners Need to Know Before Submitting
Size & Zoning Rules
Any new square footage added to your McKinney home counts against the same zoning envelope that governs ADU size, meaning large additions may affect your ability to add a future ADU. McKinney's current ADU size cap is 1,000 sq ft — within the typical range for most floor plan configurations.
McKinney 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, McKinney's ADU market supports approximately $1,802/month for a 2-bedroom unit.
Permit Process & Fees
Development Services permit fees for this project type typically range from $516 to $756 depending on project valuation and scope. Plan check runs approximately 6 weeks — though each correction cycle adds 3–6 weeks, which is why code-compliant drawings matter so much.
Addition permit packages submitted to Development Services 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 Development Services ↗Construction Cost Context
McKinney's home addition construction costs run $161–$226 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 McKinney
Many McKinney neighborhoods built after the 1990s carry HOA deed restrictions that flat-out ban detached ADUs or require them to match brick specs on the primary home, so Development Services approval doesn't mean much if your HOA board hasn't signed off separately — and that review can take longer than the permit itself. Older lots near downtown often still run on shared or undersized sewer laterals, so the city may require a sewer tap capacity check before approving your ADU plumbing, which can add a few weeks if Collin County records for that line are incomplete. Because McKinney allows short-term rentals, be aware the city also requires a separate STR registration and inspection after your certificate of occupancy — skipping that step is a common reason new ADU owners get fined before their first guest even checks in.
Expert Verdict — Marcus Reid, Licensed Designer
"In my experience with McKinney submittals, that $230/sqft figure and the 6-week timeline are really state-level averages, not McKinney-specific numbers — I'd get quotes from two or three local contractors and call Development Services directly before penciling in a budget or schedule. I've also seen plenty of "6-week" projects stretch to 10+ weeks once a drawing set comes back with corrections, and with HOAs covering 75% of neighborhoods here, don't forget that architectural review board timeline runs separately from the city's clock."
Market Context
McKinney has a median home value of $421,000. Comparable renovation projects in this market typically add 22.0% to resale value.
Neighborhoods in McKinney with the strongest home addition and resale value potential include East McKinney, Historical McKinney, Winding Creek - Hidden Creek, Stonebridge Ranch, Eldorado. City has explicitly targeted East McKinney for ADU support and many older single-family lots suitable for detached ADUs.
Permit Process
Permit applications are reviewed by the Development Services, with a plan check timeline of approximately 6 weeks. Permit fees in McKinney range from $516 to $756 depending on project scope. Design review: Yes - in historic districts only.
McKinney falls within Seismic Design Category Seismic Design Category A, which affects structural requirements for any new addition tying into the existing structure.
Local Financing Resources
Local Home Addition Lenders in McKinney
These lenders offer HELOC, construction, and renovation loans for home addition projects in Collin County. Compare terms before committing.
Offers HELOCs up to $750,000 for first liens with a minimum loan amount of $20,000.
Visit Lender ↗Provides home equity loans and HELOCs on primary residences with a maximum loan-to-value of 80%.
Visit Lender ↗Offers specific home improvement loans to finance projects that increase home value, such as remodeling.
Visit Lender ↗Provides HELOC products with terms and amounts based on creditworthiness and collateral.
Visit Lender ↗Specializes in loans based on after-renovation value, allowing borrowing up to $750k or 90% of future value.
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 McKinney
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 McKinney Home Addition Package
Transparent Pricing
McKinney 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 McKinney's building department requirements and TX CBC code. Delivered in 10 business days.
Submit to Your Building Dept
Download your complete package and submit to Development Services. We support plan check corrections at no extra charge.
Common Questions
McKinney Home Addition FAQs
Do I need a permit for a home addition in McKinney? +
Yes — any structural addition to your home in McKinney 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 McKinney's submittal requirements.
How much does a home addition cost in McKinney? +
Home additions in McKinney typically cost between $225.0–$300.0 per square foot depending on the scope, finishes, and structural complexity. A 600 sq ft addition ranges from $135,000 to $180,000. 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 McKinney? +
McKinney'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 McKinney? +
Plan check in McKinney typically takes 6 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 McKinney? +
McKinney 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 McKinney? +
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 McKinney? +
Our permit-ready home addition drawing packages for McKinney start at $1,497. Local architects and designers typically charge $3,000–$10,000+ for comparable drawing sets. Every package is engineered for TX code compliance and formatted for McKinney'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 McKinney? +
In McKinney, where median home values are approximately $421,000, 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 TX markets.
Can I add a second story to my home in McKinney? +
Second-story additions are permitted in most McKinney 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.
Also Available in McKinney
Adding an ADU instead? See our ADU design service.
Next Steps
Ready to Move Forward With Your McKinney 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.
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. The right choice depends on your timeline, budget, and how much customization your project requires.