Denver County, Colorado requires permits for most construction, alteration and repair work on private property1. Denver Community Planning & Development administers the permit process and countywide zoning; the Denver Zoning Code governs most properties, while Former Chapter 59 and site-specific rules apply elsewhere23. Check the parcel's zoning before designing or buying.
At a glance
- Building permit
- Required for most construction, alteration or repair work1
- Zoning
- Countywide; the applicable code and district depend on the parcel24
- Septic (OWTS) permit
- Rare (mostly public sewer); when needed, permitted by Denver's public health agency5
- Owner-builder exemption
- Yes, a resident owner may pull their own permit and act as general contractor6
- Tiny home (CO Division of Housing)
- Approved statewide for long-term living once state-certified, subject to local zoning7
- Accessory dwelling units
- Allowed where the zone district permits, with use and ownership conditions8
- Water well
- State well permit required for any new groundwater well statewide9
Who to call
Building permits
Denver Community Planning & Development (CPD) – Detached Homes and Duplexes
Building permits, plan review and inspections for detached single-family homes and duplexes in Denver
201 W. Colfax Ave., Dept. 205, Denver, CO 80202 (2nd floor of the Webb Municipal Building)
Zoning
Denver Community Planning & Development (CPD) – Zoning Administration
Zone lot amendments, zoning administrative adjustments and variance requests for single-family and duplex projects in Denver
201 W. Colfax Ave., Dept. 205, Denver, CO 80202 (2nd floor of the Webb Municipal Building)
Health department
Denver Department of Public Health & Environment (DDPHE)
Denver's local public health agency, which permits any on-site wastewater treatment system (OWTS) under Colorado's statewide rules
201 W. Colfax Ave., 8th Floor, Denver, CO 80202
Contact details are copied from each office’s official page and were checked against it on September 29, 2026.
Do you need a building permit in Denver County, Colorado?
Yes. Denver County requires permits for most construction, alteration or repair work on private property1. Exempt finish work includes painting, papering, tiling, floor coverings, cabinets and like-for-like plumbing fixtures, but a zoning, wastewater or fire permit may still be needed even when no building permit is required1. Permitted work must remain accessible for Denver's inspections until approved; the required inspections depend on the project and trades involved10. A resident who legally owns and occupies a single-family home may apply without a contractor, but the privilege excludes work in an ADU, townhome, condo or duplex and requires the applicable exam for personally performed electrical, plumbing or HVAC work11.
Who is the Denver County building department, and how do you reach them?
Denver Community Planning & Development (CPD) is the building department. Its line for detached homes and duplexes is 720-865-2710, and its office is on the second floor of the Webb Municipal Building at 201 W. Colfax Ave.12. For zoning interpretations, zone-lot amendments or variances involving a single-family or duplex project, contact CPD's Zoning Administration team at 720-865-260613. Residential applicants use Denver's e-permits system, select Development Services and then Building Log for most projects, and upload the required documents; the sewer-use-and-drainage review starts automatically with the building-permit application14. Plan-review charges are separate from permit charges, and the permit charge covers customary inspections rather than re-inspections15.
Does Denver County have zoning?
Yes. Zoning applies across the consolidated City and County of Denver2. The Denver Zoning Code governs most properties, but Former Chapter 59 governs properties left out of the comprehensive update, and site-specific PUDs, waivers or conditions can change the answer for a particular lot34. Setbacks, lot coverage, building height and minimum lot size therefore cannot be answered from the county name alone; ask CPD's Zoning Administration team to identify the controlling district and any site-specific restrictions13. Denver allows one accessory dwelling unit for each primary dwelling unit where the zone district permits it, but an RV, mobile home or trailer cannot serve as the ADU8. A zone lot can also differ from both the recorded subdivision lot and the assessor's tax parcel, so confirm all three before assuming a parcel can be split or developed as shown on a listing16.
How do septic (OWTS) permits work in Denver County?
Denver is largely served by public sewer, so a private on-site wastewater treatment system (OWTS, what most people call septic) is uncommon here, but where one exists it is permitted locally by Denver's public health agency under Colorado's statewide Regulation 43 rules5. Statewide, every local board of health must adopt detailed OWTS rules for its jurisdiction, and Colorado's Department of Public Health & Environment only steps in directly if a local agency substantially fails to enforce the law17. A permit must be obtained before anyone constructs, alters or installs an OWTS, and a final inspection is required after the work is done but before the system is placed in use1819. Colorado also conditions a building or occupancy permit on either public sewer service or an approved OWTS process, so a property without either cannot legally be occupied20. Denver's Department of Public Health & Environment (DDPHE) is reachable at 720-865-5484 for OWTS and other environmental health questions21.
Can you live in an RV or tiny home on your land in Denver County?
A Colorado-regulated tiny home may be approved for long-term living after the Colorado Division of Housing approves its plans, but it must also satisfy Denver zoning for the installation site7. Denver permits ADUs only where the zone district allows them, and an RV, mobile home or trailer cannot be used as an ADU8. We could not confirm a general Denver rule allowing long-term residence in an ordinary RV on a residential lot, so ask CPD's Zoning Administration team before relying on one as housing13. An RV or travel trailer also cannot be used for a Denver short-term rental; a permitted short-term rental must operate in a dwelling unit and generally be run by someone whose primary residence is the primary dwelling or an ADU on the same zone lot22.
Building or adding a home on a Denver lot: the steps, in order
- Ask CPD's Zoning Administration team which zoning code, district and site-specific conditions control the lot313.
- Confirm that the proposed structure, ADU and zone lot comply, and resolve any subdivision or zone-lot issue before design816.
- Check the regulatory floodplain map; even an interior remodel in a regulatory floodplain needs a floodplain permit through the sewer-use-and-drainage review23.
- Create an e-permits account, choose Development Services and Building Log for most projects, then upload the required documents14.
- Budget separately for plan review, the permit and any re-inspection; beginning work without a permit doubles the permit charge, subject to a $100 minimum and the stated emergency exception15.
- Keep permitted work exposed and accessible until Denver completes the required project and trade inspections10.
What to check before you buy land in Denver County, Colorado
Confirm the exact zoning code, district and any site-specific conditions before making an offer; the Denver Zoning Code governs most parcels, while Former Chapter 59 and special approvals govern others4. Compare the legal subdivision description, zone lot and assessor's parcel because they may not match16. Check for a regulatory floodplain because any construction there, including an interior remodel, triggers a floodplain permit and additional requirements23. Confirm sewer service with Denver's public health agency if the property is represented as using an on-site system; Denver is largely sewered, but we could not confirm the Denver-specific OWTS permit and inspection rules from the available official material521. Finally, budget for separate plan-review and permit charges, possible re-inspection charges, and an effective property-tax rate of about 0.4% with a median annual bill near $2,596152425.
Watch-outs
- This guide could not confirm a Denver-specific rule on living long-term in an ordinary RV on a residential lot; ask CPD's Zoning Administration team before you rely on one13.
- A Denver zone lot may not match the recorded subdivision lot or tax parcel; confirm the legal development unit before relying on a listing's boundaries or split potential16.
Sources
- Plan Review, Permits, and Inspections, quoted and re-checked
- Regulations, Codes and Standards, quoted and re-checked
- Regulations, Codes and Standards, quoted and re-checked
- Regulations, Codes and Standards, quoted and re-checked
- CDPHE – On-site Wastewater Treatment Systems (local agency permitting) (2026 county census)
- Applying for Permits as a Homeowner — General Rules (2026 county census)
- Consumers of Manufactured Homes and Tiny Homes - HUD (Colorado statewide rule), quoted and re-checked
- Denver Zoning Code Article 11: Use Limitations and Definitions, quoted and re-checked
- Water Administration (Colorado statewide rule), quoted and re-checked
- Plan Review, Permits, and Inspections, quoted and re-checked
- Applying for Permits as a Homeowner — General Rules, quoted and re-checked
- Denver Community Planning & Development (CPD) – Detached Homes and Duplexes (denvergov.org)
- Denver Community Planning & Development (CPD) – Zoning Administration (denvergov.org)
- Applying for Permits as a Homeowner — Application Process, quoted and re-checked
- 2025 Denver Building & Fire Code, quoted and re-checked
- Regulations, Codes and Standards — Subdivision and Flood Information, quoted and re-checked
- Title 25 - Public Health and Environment - Colorado Revised Statutes 2024 (Colorado statewide rule), quoted and re-checked
- Title 25 - Public Health and Environment - Colorado Revised Statutes 2024 (Colorado statewide rule), quoted and re-checked
- Title 25 - Public Health and Environment - Colorado Revised Statutes 2024 (Colorado statewide rule), quoted and re-checked
- Title 25 - Public Health and Environment - Colorado Revised Statutes 2024 (Colorado statewide rule), quoted and re-checked
- Denver Department of Public Health & Environment (DDPHE) (denvergov.org)
- Denver Zoning Code Article 11: Use Limitations and Definitions, quoted and re-checked
- Regulations, Codes and Standards — Subdivision and Flood Information, quoted and re-checked
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
Written September 29, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.