Home Addition Drawings · Centennial, CO
Permit-Ready Home Addition
Drawings for Centennial, CO
Expand your home with a permitted room addition, second story, or family room extension. We deliver complete, code-compliant drawing sets for Centennial's building department — in 10 business days, starting at $1,497.
14-day money-back guarantee · 10 business day turnaround
Local Intelligence
What Centennial Homeowners Need to Know Before Submitting
Size & Zoning Rules
Any new square footage added to your Centennial home counts against the same zoning envelope that governs ADU size, meaning large additions may affect your ability to add a future ADU. Centennial's current ADU size cap is 1,000 sq ft — within the typical range for most floor plan configurations.
Centennial 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, Centennial's ADU market supports approximately $2,188/month for a 2-bedroom unit.
Permit Process & Fees
Building Division permit fees for this project type typically range from $1,786 to $3,638 depending on project valuation and scope. Plan check runs approximately 2.2 weeks — though each correction cycle adds 3–6 weeks, which is why code-compliant drawings matter so much.
Addition permit packages submitted to Building Division 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 Building Division ↗Construction Cost Context
Centennial's home addition construction costs run $210–$320 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 Centennial
Since Centennial incorporated fairly recently and shares plan review staff with Arapahoe County for certain services, many homeowners get tripped up submitting to the wrong desk — your ADU application goes through the city's Building Division, but septic or well-related sign-offs (common in older Centennial neighborhoods that predate city water hookups) still route through Arapahoe County Environmental Health, adding a parallel approval track most people don't discover until their permit stalls. HOAs in Centennial's many planned communities, especially in areas like Piney Creek and Homestead, often have separate architectural review committees that require approval before you even file with the city, and they can reject exterior materials or roof pitch even if the Building Division has no issue with your plans. Because STRs aren't allowed here, some lenders and title companies also ask for a signed affidavit confirming the ADU won't be rented short-term, which can slow down financing if your loan officer isn't familiar with the local rule.
Expert Verdict — Marcus Reid, Licensed Designer
"In my experience, that 2.2-week plan check timeline and $300/sqft build cost are Centennial state-level estimates, not verified local figures — I'd get quotes from at least two local contractors and call the Building Division directly before penciling in a schedule. Also, with 40% of the area under HOA control, don't sleep on architectural review adding its own delay on top of whatever the city quotes you."
Market Context
Centennial has a median home value of $548,000. Comparable renovation projects in this market typically add 23.0% to resale value.
Neighborhoods in Centennial with the strongest home addition and resale value potential include Southglenn, West Centennial, Piney Creek, Walnut Hills, Fox Hill. High single-family density with very large lots (~10,890 sqft) and strong local amenities making rentals attractive.
Permit Process
Permit applications are reviewed by the Building Division, with a plan check timeline of approximately 2.2 weeks. Permit fees in Centennial range from $1,786 to $3,638 depending on project scope.
Centennial falls within Seismic Design Category B, which affects structural requirements for any new addition tying into the existing structure.
Local Financing Resources
Local Home Addition Lenders in Centennial
These lenders offer HELOC, construction, and renovation loans for home addition projects in Arapahoe County. Compare terms before committing.
Offers standard and variable-rate HELOCs to Colorado members with terms up to 240 months and flexible repayment options.
Visit Lender ↗Bellco ChoiceLine HELOC provides flexible access to home equity and the option to lock up to three fixed-rate advances — commonly used for home renovation/ADU projects.
Visit Lender ↗RenoFi is a fintech that partners with credit unions to provide ADU/renovation loans that underwrite to post‑renovation value, broadening borrowing power for ADU projects in Colorado.
Visit Lender ↗Colorado-based bank offering home equity loans/lines and in-house construction lending through local branches — often used for lot/land and ADU construction financing.
Visit Lender ↗National bank offering HELOCs and home equity options with online prequalification and products available to Colorado homeowners for remodeling/ADU work.
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 Centennial
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 Centennial Home Addition Package
Transparent Pricing
Centennial 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 Centennial's building department requirements and CO CBC code. Delivered in 10 business days.
Submit to Your Building Dept
Download your complete package and submit to Building Division. We support plan check corrections at no extra charge.
Common Questions
Centennial Home Addition FAQs
Do I need a permit for a home addition in Centennial? +
Yes — any structural addition to your home in Centennial 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 Centennial's submittal requirements.
How much does a home addition cost in Centennial? +
Home additions in Centennial typically cost between $250.0–$320.0 per square foot depending on the scope, finishes, and structural complexity. A 600 sq ft addition ranges from $150,000 to $192,000. 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 Centennial? +
Centennial'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 Centennial? +
Plan check in Centennial typically takes 2.2 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 Centennial? +
Centennial 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 Centennial? +
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 Centennial? +
Our permit-ready home addition drawing packages for Centennial start at $1,497. Local architects and designers typically charge $3,000–$10,000+ for comparable drawing sets. Every package is engineered for CO code compliance and formatted for Centennial'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 Centennial? +
In Centennial, where median home values are approximately $548,000, 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 CO markets.
Can I add a second story to my home in Centennial? +
Second-story additions are permitted in most Centennial 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 Centennial
Adding an ADU instead? See our ADU design service.
Next Steps
Ready to Move Forward With Your Centennial 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.