Home Addition Drawings · Lone Tree, CO
Permit-Ready Home Addition
Drawings for Lone Tree, CO
Expand your home with a permitted room addition, second story, or family room extension. We deliver complete, code-compliant drawing sets for Lone Tree's building department — 14-day money-back guarantee.
14-day money-back guarantee · permit-ready delivery
Local Intelligence
What Lone Tree Homeowners Need to Know Before Submitting
Size & Zoning Rules
Any new square footage added to your Lone Tree home counts against the same zoning envelope that governs ADU size, meaning large additions may affect your ability to add a future ADU. Lone Tree's current ADU size cap is 800 sq ft — within the typical range for most floor plan configurations.
Lone Tree 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, Lone Tree's ADU market supports approximately $2,328/month for a 2-bedroom unit.
Permit Process & Fees
Building Division of the City of Lone Tree permit fees for this project type typically range from $2,009 to $3,488 depending on project valuation and scope.
Addition permit packages submitted to Building Division of the City of Lone Tree 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 of the City of Lone Tree ↗⚠ Common Pitfall in Lone Tree
Almost every lot in Lone Tree sits inside a Douglas County-approved planned unit development (PUD) with its own HOA design review board, and those boards often have stricter setback and roofline-matching rules than the city's own zoning code — meaning your ADU can meet every city requirement and still get rejected until you resubmit revised elevations to the HOA. Because short-term rentals aren't allowed here, the city will also ask you to sign an affidavit confirming the unit is for long-term family or tenant use, which some lenders want to see before they'll finance the build. On top of that, Lone Tree runs water and sewer through the Willow Creek or Acres Green metro districts depending on your neighborhood, so you'll need a separate tap and service confirmation letter from that specific district before the Building Division will stamp your plans.
Expert Verdict — Marcus Reid, Licensed Designer
"In my experience, both that timeline and cost-per-square-foot figure are missing here entirely, which tells me they're likely relying on state-level estimates rather than actual Lone Tree data — I'd call the Building Division directly and get two or three local contractor quotes before penciling in a budget or schedule. With HOA coverage this high at 80%, what the data doesn't show is that your HOA's design review can add weeks to your timeline independent of whatever the city quotes you."
Market Context
Lone Tree has a median home value of $780,000. Comparable renovation projects in this market typically add 28% to resale value.
Neighborhoods in Lone Tree with the strongest home addition and resale value potential include Heritage Hills, Carriage Club, Montecito at RidgeGate, RidgeGate, McArthur Ranch. Gated luxury SFH enclave within walking distance of the Lone Tree light-rail station and Park Meadows, driving strong executive-rental demand.
Permit Process
Permit applications are reviewed by the Building Division of the City of Lone Tree. Permit fees in Lone Tree range from $2,009 to $3,488 depending on project scope.
Lone Tree 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 Lone Tree
These lenders offer HELOC, construction, and renovation loans for home addition projects in Douglas County. Compare terms before committing.
Colorado-based credit union financing primary residences, second homes, investment properties, and remodels — usable for ADU construction; also offers a separate Investment Property HELOC up to $250,000 and 75% LTV.
Visit Lender ↗Denver-metro Colorado credit union offering a One-Time Close Construction-to-Permanent loan that streamlines financing for new home construction or renovation projects (ADU-suitable).
Visit Lender ↗Colorado credit union HELOC starting as low as 6.25% variable with a 10-year draw period and 15-year repayment, plus an Interest-Only HELOC option — usable to fund ADU builds.
Visit Lender ↗Colorado community bank offering construction financing up to 80% of project costs (up to 90% with mortgage insurance on construction-to-permanent) with flexible terms and lot equity counted toward down payment.
Visit Lender ↗Colorado-based bank offering a Single-Close Construction Loan with 5/1, 7/1, and 10/1 ARM or fixed-rate (5/7/10-year) options, designed to streamline financing through construction.
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 Lone Tree
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.
Free — No Obligation
What Will Lone Tree Let You Add?
Setbacks, lot coverage, and height limits decide your addition before a single line is drawn. Send us the address and we’ll tell you what’s actually approvable — free, before you commit to a design.
- ✓Maximum footprint your lot and setbacks allow
- ✓Lot-coverage and height limits in Lone Tree
- ✓Whether your addition triggers structural or energy upgrades
- ✓Realistic plan-check timeline for your project
- ✓A straight answer within 48 hours
Review My Project — Free
Takes 60 seconds. We'll deliver your personalized report within 48 hours.
Request Received
Your feasibility report is being prepared. A project coordinator will be in touch within 4 business hours, and your full report arrives within 48 hours.
Drawing Package Details
What's Included in Your Lone Tree Home Addition Package
What You Get
What's in Your Lone Tree Home Addition Package
One-time fee, no retainer, no hourly billing — your exact scope and price confirmed on a free call.
- ✓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 Lone Tree'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 of the City of Lone Tree. We support plan check corrections at no extra charge.
Common Questions
Lone Tree Home Addition FAQs
Do I need a permit for a home addition in Lone Tree? +
Yes — any structural addition to your home in Lone Tree 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 Lone Tree's submittal requirements.
How much does a home addition cost in Lone Tree? +
Home additions in Lone Tree typically cost between $150–$400 per square foot depending on the scope, finishes, and structural complexity. A 600 sq ft addition ranges from $90,000 to $240,000. Second-story additions cost more than ground-floor extensions due to structural requirements. Contact us to discuss drawing package options for your project.
What drawings are required to permit a home addition in Lone Tree? +
Lone Tree'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 Lone Tree? +
Plan check in Lone Tree typically takes 8 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 Lone Tree? +
Lone Tree 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 Lone Tree? +
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 Lone Tree? +
Our permit-ready home addition drawing packages for Lone Tree include everything your building department requires — floor plans, elevations, structural, and energy compliance. Every package is engineered for CO code compliance and formatted for Lone Tree's building department. 14-day money-back guarantee.
Will a home addition increase my home's value in Lone Tree? +
In Lone Tree, where median home values are approximately $780,000, 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 Lone Tree? +
Second-story additions are permitted in most Lone Tree 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.
Nearby Cities
Also Available in Lone Tree
Adding an ADU instead? See our ADU design service.
Next Steps
Ready to Move Forward With Your Lone Tree 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 of the City of Lone Tree.
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
Quoted on your free call
- ✓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 of the City of Lone Tree. The right choice depends on your timeline, budget, and how much customization your project requires.