Garage Conversion Drawings · Centennial, CO
Permit-Ready Garage Conversion
Drawings for Centennial, CO
Convert your garage into permitted living space or a rental unit. We deliver complete, code-compliant drawing sets ready for Centennial's building department — in 10 business days, starting at $997.
14-day money-back guarantee · 10 business day turnaround
Local Intelligence
What Centennial Homeowners Need to Know Before Submitting
Size & Zoning Rules
Converting your garage to a legal rental unit means the finished space must comply with Centennial's ADU size limits. 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.
A fully permitted, code-compliant garage conversion in Centennial can command approximately $1,767/month as a 1-bedroom rental — far more than leaving the space as storage.
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.
Garage conversion drawings submitted to Building Division must include a site plan, floor plans, all four elevations, an electrical plan, and energy compliance documentation — plus stamped structural plans are typically required for converted garages that are detached or require seismic upgrades.
Visit Building Division ↗Construction Cost Context
Centennial's garage conversion 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 garage conversion and rental-unit 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 converted garage walls and foundations.
Local Financing Resources
Local Garage Conversion Lenders in Centennial
These lenders offer HELOC, construction, and renovation loans for garage conversion 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 Garage Conversion Contractors in Centennial
We draw the plans. These contractors build the conversion. 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 Garage Conversion Package
Transparent Pricing
Centennial Garage Conversion Drawing Packages
One-time fee. No retainer. No hourly billing.
- ✓Site plan
- ✓Floor plans
- ✓All 4 elevations
- ✓Electrical plan
- ✓Title 24 energy form
- ✓PDF + DWG delivery
- ✓10 business day turnaround
- ✓Everything in Starter
- ✓Structural plans (stamped)
- ✓Cross-section details
- ✓Window & door schedules
- ✓Material specifications
- ✓1 round of revisions
- ✓Everything in Standard
- ✓3D rendering
- ✓HOA submission package
- ✓ADU conversion alt plan
- ✓2 rounds of revisions
- ✓Priority 5-day turnaround
After You Order
Your Conversion Drawings in 3 Steps
Submit Your Garage Details
Share your property address, garage dimensions, and intended use (ADU, rental, home office). We confirm your order and assign your project coordinator within 4 business hours.
We Draft Your Drawings
Our team designs your complete conversion drawing set — engineered for Centennial's building department requirements and CO 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 Garage Conversion FAQs
Is a garage conversion allowed in Centennial? +
Yes — garage conversions are permitted in Centennial. Colorado state law allows homeowners to convert an attached or detached garage into habitable living space or an ADU. A building permit and permit-ready drawings are required before work begins.
How much does a garage conversion cost in Centennial? +
Garage conversions in Centennial typically range from $110,000 to $242,000 depending on the existing structure, finish level, and scope of work. This is significantly less than building a new detached ADU. Our drawing package starts at $997 — a fraction of what a local architect would charge for the same permit-ready set.
What drawings are required to permit a garage conversion in Centennial? +
Centennial's building department requires: a site plan showing the converted garage's location on the lot, floor plans with dimensions and room labels, all four exterior elevations, an electrical plan, and energy compliance documentation (Title 24 in California). Our Starter package covers all of these. If the garage is detached or the structure requires seismic upgrades, stamped structural drawings are also required — included in our Premium package.
How long does the permit process take for a garage conversion in Centennial? +
Plan check in Centennial typically takes approximately 2.2 weeks. Having complete, code-compliant drawings dramatically reduces correction cycles — which each add 3–6 weeks. Our drawings are designed to pass on the first submittal.
Can I convert my garage into a rental unit in Centennial? +
Yes — a permitted garage conversion can function as a standalone rental unit (ADU or JADU depending on size). In California, converted garages under 500 sq ft qualify as Junior ADUs (JADUs), while larger conversions qualify as full ADUs. Both can be rented long-term. Short-term rental rules vary by city — confirm with Centennial's planning department.
Do I need to replace the garage door opening when converting? +
Yes. The garage door must be replaced with an insulated wall with a standard entry door and at least one egress window (minimum 5.7 sq ft clear opening). This is captured in our elevation drawings and flagged in the electrical plan. The new wall must also meet CO energy code requirements, which we handle in the Title 24 compliance documentation.
How much does it cost to get garage conversion drawings in Centennial? +
Our permit-ready garage conversion drawing packages for Centennial start at $997. Local architects typically charge $2,500–$6,000 for the same set. 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 converting my garage increase my home's value in Centennial? +
A permitted garage conversion in Centennial adds rentable square footage to a home currently valued around $548,000. Converted spaces typically appraise as habitable square footage, increasing the home's value. As an ADU or JADU, the rental income stream is also capitalized into the appraised value — typically at a 5–6% cap rate.
Also Available in Centennial
Need full ADU design drawings instead?
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.