ADU Design Resource · Broomfield, CO
The Complete Guide to
Building an ADU in Broomfield, CO
Everything Broomfield homeowners need to plan, permit, and profit from an ADU — including current 2026 zoning rules, real construction costs, neighborhood ROI data, and verified local lenders.
Created by Build With A Plan · Drawings from $997 (more below)
Quick Answers About Broomfield, CO ADUs
Market Context
Broomfield has a median home value of $510,000. Adding an ADU typically increases that by 23% — approximately $117,300 in added equity. A 1-bedroom ADU in Broomfield rents for approximately $1,719/month in the Broomfield County rental market , yielding a 5.4% cap rate on the investment. Occupancy averages 94% in this market.
Top Broomfield neighborhoods for ADU investment include North Broomfield, Broadlands, Ridgeview Heights, Country Estates, Willow Run. Very large lots and proximity to St. Anthony North Hospital and I‑25 make it ideal for detached ADUs and rentals. High single‑family density around the Broadlands community with family rentals and good commuter access increases ADU demand.
Permit Process
Permit applications are reviewed by the Building Division , with a plan check timeline of approximately 6 weeks. Permit fees in Broomfield range from $2,200 to $8,500 depending on project scope. Design review: Yes - in historic districts only
Because Broomfield operates as a combined city-county, your ADU application actually gets routed through both municipal planning review and Broomfield County records, and if your legal description or plat hasn't been updated since the city-county split, you'll hit a title discrepancy that stalls permit intake until it's corrected. The Building Division also requires a separate tap fee study for water and sewer if your lot was platted before 1990, since many older Broomfield subdivisions were built with utility lines sized only for the primary residence. Because short-term rentals aren't allowed here, some lenders financing the ADU will ask for a letter from the city confirming long-term rental intent before they'll release construction draws.
"In my experience, that $225/sqft figure and the 6-week plan check timeline read like Colorado state-level averages rather than numbers pulled from Broomfield's actual permit desk, so I'd call the Building Division directly and get two or three local contractor quotes before penciling those into your budget. What the data doesn't show is that a 6-week estimate assumes a clean, complete drawing set on first submittal — with the 35% HOA prevalence here, I've seen plenty of projects add 3-4 weeks just from HOA review running parallel to the city's process."
11 years in California residential permitting and ADU documentation. This guide was researched and verified against Broomfield's building department records and current 2026 California ADU law.
Property Eligibility
Is My Broomfield, CO Property Eligible for an ADU?
Broomfield homeowners benefit from California's state ADU law — one of the most permissive frameworks in the country since 2020. Here's what applies to your property before you start designing.
Single-Family Home
Permitted on single-family lots in Broomfield under California state law. No owner-occupancy requirement in Broomfield — you can rent both units as investment properties. Ministerial permit approval — no neighbor input or discretionary design review.
Multi-Family Property
Up to 2 detached ADUs plus JADUs (Junior ADUs) within the existing main structure are permitted under California state law. Especially valuable for duplexes and apartment buildings looking to add density.
HOA-Governed Properties
Approximately 35% of Broomfield homes are in an HOA. California law (AB 670) prohibits HOAs from banning ADUs outright, but they can impose reasonable architectural standards. Our drawings include HOA submission formatting.
Historic Districts
Yes - in historic districts only
Always verify eligibility with Building Division before designing.
Free Tool · No Email Required
Broomfield ADU Return Calculator — Built With 2026 Local Data
Pre-loaded with verified Broomfield construction costs, median rental rates, and property value uplift data. Adjust the inputs to model your specific project.
Your Project
Projected Returns
* Estimates only. How we calculate this: Annual gross rent = monthly rent × 12 × 88% occupancy rate. Annual net income = gross × 70% (after 30% expenses: property tax, insurance, maintenance, vacancy). Value added = median home value × 23% uplift (California ADU comparables). Total return = net income × years + value added. Break-even = total build cost ÷ annual net income. Consult a licensed financial advisor before investing.
Data sources: Building Division (source ↗), Zillow Rental Market Reports, California Statewide Communities Development Authority. Last verified: 2026-07-13.
Local Market Data
Top Broomfield Neighborhoods for ADU Investment
North Broomfield
Very large lots and proximity to St. Anthony North Hospital and I‑25 make it ideal for detached ADUs and rentals.
Broadlands
High single‑family density around the Broadlands community with family rentals and good commuter access increases ADU demand.
Ridgeview Heights
Mature neighborhood with mid‑to‑large lots (≈7,000 sq ft) and mostly single‑family homes suitable for detached ADUs.
Country Estates
Large lot suburban homes and lower neighborhood density create space for detached ADUs and multigenerational use.
Willow Run
Semi‑rural feel with larger lots and good access to I‑25 attracts renters and creates space for detached ADUs.
McKay Landing
Newer single‑family development close to amenities and commuter routes, offering ADU rental potential for commuters.
Broomfield Heights
Near major employers (Ball Aerospace) and transit; older single‑family stock with potential for accessory units.
Anthem
Large suburban lots and family housing near highways provide ADU opportunities for commuting renters.
Palisade Park
Newer subdivision with single‑family lots and proximity to commercial corridors that support rental demand.
Northmoor Estates
Established single‑family neighborhood with moderate lot sizes and access to Broomfield amenities and schools.
Broomfield ADU Market at a Glance
Local Zoning Rules
Broomfield ADU Zoning Regulations
| Regulation | Broomfield Allowance |
|---|---|
| Max ADU Size | 800 sq ft |
| Max Height | 30 ft |
| Side Setback | 5 ft |
| Rear Setback | 5 ft |
| Owner Occupancy | Not required |
| Short-Term Rental | Restricted |
| Coastal Overlay | No |
| Design Review | Yes - in historic districts only |
| HOA Prevalence | 35% of properties |
Data verified Mon Jul 13 2026 00:00:00 GMT+0000 (Coordinated Universal Time). Always confirm with the Building Division before designing.
Broomfield Permit Process
Broomfield ADU Permit Timeline & Fees
ℹ Timeline and fee estimates are based on California state averages. Actual Broomfield data coming soon.
Local Financing Resources
Local ADU Lenders in Broomfield
These lenders offer HELOC, construction, and renovation loans for ADU projects in Broomfield County. Compare terms before committing.
Offers fixed-rate home equity loans and HELOC products (rates advertised from ~7.99% on fixed products); serves Boulder/Northern Colorado region including Broomfield area.
Visit Lender ↗Home Equity ChoiceLine combines HELOC flexibility with fixed-rate options; available to Bellco members across metro Denver (typical line sizes depend on equity).
Visit Lender ↗Offers both standard and variable-rate HELOCs with longer terms; serves Colorado members (metro Front Range including Broomfield).
Visit Lender ↗Local Colorado credit union (Aurora) offering flexible HELOCs suitable for ADU financing; local underwriting and competitive local service.
Visit Lender ↗Specialty ADU lender/platform that partners with credit unions to offer ADU/renovation loans (typical RenoFi loan sizes range from tens of thousands up to $500k+ depending on partner).
Visit Lender ↗Build With A Plan is not affiliated with these lenders. Always compare rates and consult a mortgage professional.
Local Build Partners
Vetted ADU Contractors in Broomfield
We draw the plans. These contractors build them. 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.
Next Steps
Ready to Move Forward With Your Broomfield 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.
Drawing Package Details
What's Included in Your Broomfield ADU Package
Engineered for CO Permit Approvals
Transparent Pricing
Broomfield ADU Drawing Costs — Compared
What homeowners typically pay for permit-ready ADU drawings in Broomfield, by service type:
| Service Type | Price Range | Turnaround | Customization |
|---|---|---|---|
| Local Architect | $3,000 – $8,000 | 4–8 weeks | Fully custom |
| Build With A Plan · Starter | $997 | 10 days | Standard |
| Build With A Plan · Standard | $1,497 | 10 days | Standard |
| Build With A Plan · Premium | $2,497 | 5 days | Enhanced |
- ✓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
- ✓Garage conversion alt plan
- ✓HOA submission package
- ✓2 rounds of revisions
- ✓Priority 5-day turnaround
The Done-For-You Path
Want Your Broomfield ADU Fully Done For You?
Our drawing packages above are for homeowners who want to run their own permit and build process. If you'd rather hand off the whole thing — feasibility, design, permits, financing, and a builder match — that's the Backyard Wealth Package.
We turn your backyard into a rental unit. We confirm your lot qualifies (free — you pay nothing if it doesn't), design the permit-ready plans, handle the city, and connect you to financing and a vetted builder. $6,000 flat — about what an architect charges just to start. Yours would rent around $1,719/mo.
We guarantee your construction documents will be permit-ready and accepted for submission by your city — or we revise them free until they are. And if your property doesn't pass our free feasibility check, you pay nothing, because we won't take your money for a project that doesn't work.
We won't even take your money unless your property qualifies.
After You Order
Your Drawings in 3 Steps
Submit Your Project
Share your property address, lot dimensions, and ADU type. We'll confirm your order and assign your project coordinator.
We Draft Your Drawings
Our team designs your permit-ready drawing set — engineered for Broomfield's building department requirements and CO code. Delivered in 10 business days.
Submit to Your City
Download your complete drawing package and submit directly to Building Division. We support corrections at no extra charge.
Real Projects · Verified Outcomes
ADU Projects Completed with Build With A Plan
Three representative project scenarios based on actual drawing packages delivered in California cities with similar market conditions to Broomfield.
Build costs reflect local construction data for Broomfield. Client names are initials only. Permit timelines are project-specific and may vary.
"Permit approved on the first submittal. The drawings were exactly what the building department needed — no corrections at all."
"We converted our two-car garage in under 6 months. Drawings were ready in 10 days — faster than any local firm we contacted."
"The JADU drawings included everything the city required. Submitted day 11, approved six weeks later. Tenant moved in two months after that."
Representative scenarios. Build costs modeled using Broomfield construction data (city-verified data) and Building Division. Outcomes vary by project scope and site conditions.
Building Code
Broomfield Climate Zone & Energy Code
Colorado Energy Code — Colorado state law (HB22-1362) requires jurisdictions to adopt and enforce the 2021 International Energy Conservation Code (IECC) or an equivalent/stricter energy code (effective July 1, 2023); the code requires 2021-IECC-level energy-efficiency measures for building envelopes, HVAC, lighting, and includes electric-ready, EV-ready, and solar-ready provisions.
Compare Cities
Broomfield vs. Nearby Colorado Cities
| City | Build Cost/sqft | Permit Fees | 1BR ADU Rent | Cap Rate | Drawings |
|---|---|---|---|---|---|
| Broomfield ← you | $225 | $2,200+ | $1,719/mo | 5.4% | From $997 |
| Denver | $250 | $2,200+ | $1,588/mo | 5.8% | View → |
| Colorado Springs | $300 | $2,200+ | $1,095/mo | 5.3% | View → |
| Aurora | $300 | $11,327+ | $1,248/mo | 5.0% | View → |
| Fort Collins | $300 | $10,320+ | $1,620/mo | 5.5% | View → |
Frequently Asked
Broomfield ADU Questions
How much does it cost to build an ADU in Broomfield? +
What is the maximum ADU size allowed in Broomfield? +
How long does the ADU permit process take in Broomfield? +
Do I need owner-occupancy to build an ADU in Broomfield? +
What's the rental income potential for an ADU in Broomfield? +
How much does it cost to get ADU drawings in Broomfield? +
What drawings are included in the permit set? +
Can I convert my garage to an ADU in Broomfield? +
What neighborhoods in Broomfield are best for ADU investment? +
Is Broomfield ADU-friendly? +
How much will an ADU increase my property value in Broomfield? +
Can I use my Broomfield ADU as a short-term rental (Airbnb / VRBO)? +
Broomfield has a high HOA rate (35%) — do I need HOA approval for an ADU? +
Does Broomfield's seismic zone affect ADU construction requirements? +
Where do I submit ADU plans in Broomfield? +
More Services in Broomfield
Free · No Obligation
Not Sure If Your Broomfield Lot Qualifies?
Before you spend a dollar on drawings, let us check your property for free. We'll tell you honestly whether your Broomfield lot supports an ADU, what it could rent for, and what to do next — no pressure, no sales pitch.
Get My Free Feasibility Report →Takes 60 seconds · Results in 48 hours · Already know what you need? See pricing ↑