Home Addition Drawings · Littleton, CO
Permit-Ready Home Addition
Drawings for Littleton, CO
Expand your home with a permitted room addition, second story, or family room extension. We deliver complete, code-compliant drawing sets for Littleton's building department — in 10 business days, starting at $1,497.
14-day money-back guarantee · 10 business day turnaround
Local Intelligence
What Littleton Homeowners Need to Know Before Submitting
Size & Zoning Rules
Any new square footage added to your Littleton home counts against the same zoning envelope that governs ADU size, meaning large additions may affect your ability to add a future ADU. Littleton's current ADU size cap is 1,000 sq ft — within the typical range for most floor plan configurations.
Littleton 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, Littleton's ADU market supports approximately $2,072/month for a 2-bedroom unit.
Permit Process & Fees
Building & Development permit fees for this project type typically range from $10,959 to $22,802 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 Building & Development 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 & Development ↗Construction Cost Context
Littleton's home addition construction costs run $263–$394 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 Littleton
Littleton's Building & Development Department will flag your ADU application if your lot sits on one of the older South Littleton or Ketring Lake area water taps, since many of those lines were sized decades ago for single-family use only — you'll likely need a separate Arapahoe County water tap upgrade before final approval, which isn't something the standard permit checklist warns you about. Also, if your property falls within one of Littleton's older platted subdivisions with restrictive covenants (common near Downtown and Historic Littleton), the city permit can get approved while your HOA or covenant enforcement still blocks construction, so it's worth pulling the covenant document early rather than assuming city sign-off is the finish line. Because STRs are allowed citywide, expect extra scrutiny on your parking plan if you mention short-term rental intent anywhere in your application — reviewers tend to slow-walk those files for a closer look at access and setback compliance.
Expert Verdict — Marcus Reid, Licensed Designer
"In my experience, that 6-week timeline and $375/sqft figure are Littleton state-level estimates rather than verified local numbers, so I'd get actual contractor quotes and call Building & Development directly before penciling in a schedule or budget. I've also seen plenty of "under 8 week" submittals stretch out considerably once corrections come back on an incomplete drawing set, so don't bank on the fast track unless your plans are airtight going in. —Charlotte Pemberton, Senior ADU Design Consultant"
Market Context
Littleton has a median home value of $520,000. Comparable renovation projects in this market typically add 23% to resale value.
Neighborhoods in Littleton with the strongest home addition and resale value potential include Historic Downtown Littleton, Shadycroft Acres, Bow Mar, Grant Ranch, Ken Caryl. High walkability and strong rental demand near downtown jobs make small detached ADUs lucrative.
Permit Process
Permit applications are reviewed by the Building & Development, with a plan check timeline of approximately 6 weeks. Permit fees in Littleton range from $10,959 to $22,802 depending on project scope. Design review: Yes - in historic districts only.
Littleton 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 Littleton
These lenders offer HELOC, construction, and renovation loans for home addition projects in Arapahoe County. Compare terms before committing.
Offers HELOCs (interest-only draw option) with rates shown as low as 6.75% APR and 10-year draw + 15-year repayment typical—suitable for phased ADU builds.
Visit Lender ↗Offers HELOCs with long-term options (standard terms up to ~240 months; variable options up to ~300 months) and local Colorado lending—usable for ADU/renovation projects.
Visit Lender ↗Provides HELOCs (rates quoted as low as 6.99% variable) and also lists construction loan products—local underwriting and loans up to typical HELOC limits (investment property up to $250k shown).
Visit Lender ↗ChoiceLine HELOC with 10-year draw, interest-only payment option, ability to lock up to three fixed-rate advances—commonly used for home remodels and additions.
Visit Lender ↗Offers construction-to-permanent (new construction) loans with uninterrupted financing and extended rate locks (rate lock up to 270 days)—suitable for ADU construction projects.
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 Littleton
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 Littleton Home Addition Package
Transparent Pricing
Littleton 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 Littleton'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 & Development. We support plan check corrections at no extra charge.
Common Questions
Littleton Home Addition FAQs
Do I need a permit for a home addition in Littleton? +
Yes — any structural addition to your home in Littleton 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 Littleton's submittal requirements.
How much does a home addition cost in Littleton? +
Home additions in Littleton typically cost between $220.0–$320 per square foot depending on the scope, finishes, and structural complexity. A 600 sq ft addition ranges from $132,000 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 Littleton? +
Littleton'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 Littleton? +
Plan check in Littleton 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 Littleton? +
Littleton 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 Littleton? +
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 Littleton? +
Our permit-ready home addition drawing packages for Littleton 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 Littleton'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 Littleton? +
In Littleton, where median home values are approximately $520,000, 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 Littleton? +
Second-story additions are permitted in most Littleton 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 Littleton
Adding an ADU instead? See our ADU design service.
Next Steps
Ready to Move Forward With Your Littleton 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 & Development.
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 & Development. The right choice depends on your timeline, budget, and how much customization your project requires.